JP3790090B2 - Cutting method of hard synthetic resin material - Google Patents

Cutting method of hard synthetic resin material Download PDF

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Publication number
JP3790090B2
JP3790090B2 JP2000142999A JP2000142999A JP3790090B2 JP 3790090 B2 JP3790090 B2 JP 3790090B2 JP 2000142999 A JP2000142999 A JP 2000142999A JP 2000142999 A JP2000142999 A JP 2000142999A JP 3790090 B2 JP3790090 B2 JP 3790090B2
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Prior art keywords
cutting
blade
elastic body
hardness
synthetic resin
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JP2001322096A (en
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尊久 樫本
智也 入口
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テーピ熱学株式会社
帝国ピストンリング株式会社
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Description

【0001】
【発明の属する技術分野】
本発明は、硬質の合成樹脂材を所望の形状に切断する切断方法に関する。
【0002】
【従来の技術】
アクリル樹脂等の硬質の合成樹脂からなる板素材は、常温でせん断加工するとクラックを生じ易い。この種の合成樹脂製板素材を真空成形や加圧成形する場合、成形メーカーは、素材メーカーが押出しやキャスト法等によって製造した規格寸法の定尺の板素材を、製品形状に応じた矩形寸法に丸鋸やバンドソー等で切断し、二次加工している。更に、真空成形や加圧成形の場合には、成形加工後、耳部を切断している。
【0003】
上記製造工程によると、
・耳部や切屑が発生するため、素材の重量歩留まりが低く
・生産性が低く(切断形状が複雑な場合、自動化が困難で切断速度が遅い)
・リサイクルが不可能な切屑を大量に発生する
不都合がある。
【0004】
切屑を発生しない切断方法として、被切断形状に形成した切断刃と、この切断刃の周囲に弾性体を配設した上型及び下型を用い、上下型の間に樹脂板を置いて、樹脂板の上下面に切断刃を打込み、切断する技術が提案されている(特開平7−285099号)。この技術は、超硬合金等で形成した刃を備え、上下型を鋼等で形成した高価な打抜き型に利用されている。
【0005】
【発明が解決しようとする課題】
本発明者が、上記技術を種々の板厚のアクリル樹脂に適用して試験したところ、以下の事項が明らかになった。
・切断面は上刃食い込み部、クラック部、及び下刃食い込み部からなる。
・板厚が増加すると、クラック部の表面が粗くなる。
・切断刃の刃先が鋭利なうちはクラック部の表面は滑らかであるが、刃先が鈍くなるとクラック部の表面は粗くなる。
・アクリル樹脂へのゴムの添加量が増加すると、われ、欠け、ひげ等の欠陥が発生しにくい。
・ゴムの添加量が少ないアクリル樹脂は、切断刃の食い込み量、弾性体の厚み、硬度等の切断条件により、クラック部の表面の粗さが大きく変化する。
そして、上記発明によると、切断刃の刃先の摩耗・損傷が比較的早期に発生するので、滑らかな切断面を得るには、頻繁な切断刃の交換が必要である。また、合成樹脂の材質や板厚の変化により、得られる切断面の粗さが大きく変化する不都合がある。
【0006】
本発明は、幅広い材質、板厚に亘って滑らかな切断面が得られ、しかも、切断刃の寿命が長い、硬質の合成樹脂材の切断方法を提供することを課題とする。
【0007】
【課題を解決するための手段】
上記課題を解決するために、本発明は次の解決手段を採る。
本発明は、刃物が上型基板の下面と下型基板の上面から突出して対向配置され、前記上下の各刃物の両側面に刃物の突出高さよりも厚い厚さの弾性体が配置され、前記対向する刃物の刃先を板材の上下面に打ち込んで硬質の合成樹脂材を切断する方法であって、切断時、先に一方の型の刃物の刃先が板材の一面に接触し、食い込み、板材に曲げ変形を生じさせ、次に、他方の面側の刃物の刃先が板材の表面に接触し、食い込み、他方の面側の刃物の刃先から一方の面側の刃物の刃先に向かって脆性破壊を生じさせて板材を切断する方法において
上型の弾性体下面と刃物の刃先との距離をDU、下型の弾性体上面と刃物の刃先との距離をDLとしたとき、上型の弾性体をDUだけ圧縮する力の大きさと、下型の弾性体をDLだけ圧縮する力の大きさとが相違していることを特徴とする。
【0008】
上記の関係は、次のいずれかの手段で実現できる。
(1)DU=DLで、上型の弾性体の硬度と下型の弾性体の硬度とを相違させる。例えば、DU=DLで、上型の弾性体の硬度を下型の弾性体の硬度よりも低くする。
(2)上型の弾性体の硬度と下型の弾性体の硬度とが同一で、DUとDLの長さを相違させる。例えば、上型の弾性体の硬度と下型の弾性体の硬度とが同一で、DU<DLの関係にする。
(3)DUとDLの長さが相違し、上型の弾性体の硬度と下型の弾性体の硬度とを相違させる。例えば、DU<DLで、上型の弾性体の硬度を下型の弾性体の硬度よりも低くする。
【0009】
上記の関係を満たすのに、弾性体を、硬度が相違している少なくとも2層の積層構造としてもよい。
【0011】
曲げ変形の曲率半径は300〜800mmの範囲であるのが好ましい。
【0012】
上記の切断型の上型と下型との間に、硬質の合成樹脂板を置き、対向する刃物の刃先を被切断物の上下面に打込むと、上型の弾性体をDUだけ圧縮する力の大きさと、下型の弾性体をDLだけ圧縮する力の大きさとが相違しているため、先に一方の型の刃物の刃先が板材の一面に接触し、食い込み、板材は他方の面を凸に曲げ変形を生じる。このとき、板材には、曲げ変形により、他方の面側に切断面に垂直な引張応力が作用する。更に、プレスすると、他方の面側の刃物の刃先が板材の表面に接触し、食い込み、他方の面側の刃物の刃先から一方の面側の刃物の刃先に向かって脆性破壊が起きて、板材が所定の打抜き形状に切断される。このように、切断時、板材の片方の面側に、切断面に垂直な引張応力が作用した状態で刃物が打ち込まれることにより、片方の面側の刃物の刃先からもう片方の面側の刃物の刃先に向かってクラックが連続的に発生するため、滑らかで良好な切断面が得られる。また、上型と下型の刃物の食い込み量が浅くて切断できるため、刃物の寿命を長くできる。
【0013】
上記において、硬質の合成樹脂としては、ポリ塩化ビニル、ポリプロピレン、ABS、ポリエチレンテレフタレート樹脂等の汎用プラスチック、アクリル樹脂、ポリスチレン樹脂、メタアクリル−スチレン共重合樹脂及びスチレン−アクリロニトリル共重合樹脂等の熱可塑性樹脂、熱硬化性樹脂、及びエンジニアリングプラスチックなどが挙げられる。
【0014】
【発明の実施の形態】
以下、本発明の一実施形態1を図1〜図3により説明する。なお、図は位置決め孔などは省略して描かれており、刃物と弾性体の関係を図示している。
【0015】
切断型は、上型1と下型2とからなる。上型1及び下型2を形成する上型基板3及び下型基板4の材料は、Al合金製である。本実施形態の切断型は、板材を端から短冊状に切断するものであり、真直ぐな帯状刃物5,6を備えている。
【0016】
上型基板3と下型基板4は、真直ぐな帯状刃物5,6が圧入される刃物圧入部7,8を有している。上型基板3の刃物圧入部7は、一直線上に間隔をおいて配置する複数個のスリット状の貫通孔9と、貫通孔9間の基板3の下面に形成されている溝10とで構成されている。貫通孔9と溝10は基板3に垂直に形成され、同じ圧入幅を有している。下型基板4の刃物圧入部8は、上型基板3の刃物圧入部7に対向する位置に、上型基板3の刃物圧入部7と同じ構造、大きさの貫通孔11と溝12とで構成されている。なお、溝12は下型基板4の上面に形成されている。
【0017】
上型基板3と下型基板4に固定される各刃物5,6は、紙、シート、ゴム等を切断するトムソン刃等を用いることができる。各刃物5,6は、それぞれ上型基板3及び下型基板4の刃物圧入部7,8と略同じ大きさの帯状刃物であり、刃先角度は一般的に30〜55度である。刃先角度が小さいほど、厚板の切断に適しているが、刃先の寿命が短くなる。上型基板3及び下型基板4の刃物圧入部7,8の貫通孔9,11と溝10,12の幅は、刃物5,6の厚さよりやや小さく(1/100〜3/100mm)すると、各刃物5,6がそれぞれ上型基板3及び下型基板4に確実に固定され、刃先の位置精度を向上できる。
【0018】
各刃物5,6の縦方向長さはそれぞれ上型基板3及び下型基板4の厚さよりも長い長さを有しており、刃先と反対側の端部には複数個所に矩形形状の切欠き13,14を有している。各切欠き13,14は上型基板3及び下型基板4に形成されている各刃物圧入部7,8の溝10,12位置に対応して形成されている。したがって、各刃物5,6がそれぞれ上型基板3及び下型基板4の各刃物圧入部7,8に圧入固定された状態では、刃物5,6の切欠き13,14部が刃物圧入部7,8の溝10,12部に圧入されており、切欠き13,14の形成されていない部分が刃物圧入部7,8の貫通孔9,11に圧入されている。この際、各刃物5,6の刃先と反対側の端面が上型基板3及び下型基板4の端面と面一になるように固定されることによって、各刃物5,6の上下方向の位置決めが行われ、各刃物5,6の刃先はそれぞれ上型基板3及び下型基板4から所定長さ突出して配置される。
【0019】
上型基板3及び下型基板4の表面からの各刃物5,6の刃先の突出高さは、2.5〜6.0mmの範囲とする。刃物5,6の突出高さが高すぎると、刃先の位置精度が低下する。しかし、突出高さが小さすぎると、被切断物を位置決めするガイドピンや後述する弾性体等の構成に不自由を生じる。より好ましい突出高さは3.0〜5.0mmである。
【0020】
上型基板3の下面には、同一形状、同一の大きさの弾性体15,16が刃物5の両側面に配置固定されている。弾性体15,16は、矩形の板形状をなし、ゴム製スポンジ等の弾性材から形成されており、刃物5の突出高さより少し厚い厚さを有している。下型基板4にも、その上面に、同一形状、同一の大きさの弾性体17,18が刃物6の両側面に配置固定されている。弾性体17,18は、矩形の板形状をなし、ゴム製スポンジ等の弾性材から形成されており、刃物6の突出高さより少し厚い厚さを有している。
【0021】
ここで、上型1の弾性体15,16の下面と刃物5の刃先との距離をDU、下型2の弾性体17,18の上面と刃物6の刃先との距離をDLとしたとき、
上型1の弾性体15,16をDUだけ圧縮する力の大きさ<下型2の弾性体17,18をDLだけ圧縮する力の大きさ
となるように構成する。
【0022】
本実施形態においては、上記関係を満たすために、上型1の弾性体15,16の硬度は下型2の弾性体17,18の硬度よりも低くされており、DU=DLである。上型1の弾性体15,16の硬度は硬度15、下型2の弾性体17,18の硬度は硬度25である。このような関係は、板材が比較的薄い場合に効果的である。
【0023】
図2及び図3において、上型1と下型2との間に描かれている板材20は、被切断物である硬質の合成樹脂板を示している。
【0024】
次に、上記切断型を用いて硬質の合成樹脂板を切断する方法を説明する。
【0025】
前述した切断型を機械式プレス機あるいは油圧プレス機にセットする。セットした切断型の上型1と下型2との間に、硬質の合成樹脂板20を置き、対向する刃物5,6の刃先を被切断物の上下面に打込む。
【0026】
このとき、
上型1の弾性体15,16をDUだけ圧縮する力の大きさ<下型2の弾性体17,18をDLだけ圧縮する力の大きさ
の関係があるので、先に上型1の刃物5の刃先が板材20の上面に接触し、食い込み、板材20は下面を凸に曲げ変形を生じる。このとき、板材20には、曲げ変形により、下面側に切断面に垂直な引張応力が作用する。更に、プレスすると、下型2の刃物6の刃先が板材20の下面に接触し、食い込み、下型2の刃物6の刃先から上型1の刃物5の刃先に向かって脆性破壊が起きて、板材20が所定の打抜き形状に切断される。下型2の刃物6の刃先が接触する際の板材20の曲げ変形の曲率半径は300〜800mmの範囲とするのが望ましい。
【0027】
このように、切断時、板材20の下面側に、切断面に垂直な引張応力を作用させた状態で下型2の刃物6が打ち込まれることにより、下型2の刃物6の刃先から上型1の刃物5の刃先に向かってクラックが連続的に発生するため、滑らかで良好な切断面が得られる。また、上型1と下型2の刃物5,6の食い込み量が浅くて切断できるため、刃物5,6の寿命を長くできる。
【0028】
被切断物への刃先の打込み深さは上下それぞれ0.2〜0.7mmとする。打込み深さが小さすぎると切断できない部分が生じることがあり、大きすぎると刃先の寿命を短くする。また、打込み速度が大きい方が若干切断面性状が良好となる傾向が認められる。しかし、被切断物の板厚が0.8〜5.0mmの範囲であれば、通常の機械式プレス機あるいはこれより低速の油圧プレス機のプレス速度の範囲で切断可能である。
【0029】
切断後、上型1と下型2を離反させると、切断材は圧縮されていた弾性体15,16,17,18の元の形への復帰力によって刃物5,6の刃先から離脱され、下型2の弾性体17,18上に載置される。
【0030】
切断材は、切断面が上型1の刃物5の食い込み部、クラック部、及び下型2の刃物6の食い込み部の順に並んでおり、上型1の刃物5の食い込み部の長さが下型2の刃物6の食い込み部の長さよりも大きい。
【0031】
図4は、本発明の別の実施形態2を示している。本実施形態2と上記実施形態1とは弾性体の構成が相違しているだけで、他の構成は同じである。本実施形態2の弾性体は、上型1の弾性体15,16の硬度が下型2の弾性体17,18の硬度よりも低くされており、DU<DLである。上型1の弾性体15,16の硬度は硬度15、下型2の弾性体17,18の硬度は硬度25である。このような関係は、板材が厚い場合に効果的である。
【0032】
図5は、本発明の更に別の実施形態3を示している。本実施形態3と上記実施形態1とは弾性体の構成が相違しているだけで、他の構成は同じである。本実施形態3は、上型1の弾性体15,16と下型2の弾性体17,18が、硬度が相違している2層の積層構造にそれぞれ形成されている。そして、上型1の弾性体15,16の硬度が下型2の弾性体17,18の硬度よりも低くされており、DU=DLである。上型1の一方の弾性体15は弾性体15a(硬度15)と弾性体15b(硬度25)が上型基板3に順に積層されて形成されており、もう一方の弾性体16も弾性体16a(硬度15)と弾性体16b(硬度25)が上型基板3に順に積層されて形成されている。下型2の一方の弾性体17は弾性体17a(硬度35)と弾性体17b(硬度25)が下型基板4に順に積層されて形成されており、もう一方の弾性体18も弾性体18a(硬度35)と弾性体18b(硬度25)が下型基板4に順に積層されて形成されている。
【0033】
図6は、本発明の更に別の実施形態4を示している。本実施形態4と上記実施形態1とは弾性体の構成が相違しているだけで、他の構成は同じである。本実施形態4は、上型1の弾性体15,16は1層であり、下型2の弾性体17,18は硬度が相違している2層の積層構造に形成されている。そして、上型1の弾性体15,16の硬度が下型2の弾性体17,18の硬度よりも低くされており、DU<DLである。上型1の弾性体15,16の硬度は硬度25である。下型2の一方の弾性体17は弾性体17a(硬度35)と弾性体17b(硬度25)が下型基板4に順に積層されて形成されており、もう一方の弾性体18も弾性体18a(硬度35)と弾性体18b(硬度25)が下型基板4に順に積層されて形成されている。
【0034】
以上説明した切断型で、板厚が0.8〜5mmの範囲、材質がゴム添加量0〜30%の範囲の種々のアクリル樹脂板の切断試験を行ったところ、安価なトムソン刃を用いているにもかかわらず、3万回の切断後も良好な切断面が得られ、本発明の効果が確認された。
【0035】
なお、本発明は上記実施形態に限られることはなく、例えば、DU>DLで、上型1の弾性体15,16の硬度を下型2の弾性体17,18の硬度よりも低くすることにより、
上型1の弾性体15,16をDUだけ圧縮する力の大きさ<下型2の弾性体17,18をDLだけ圧縮する力の大きさ
の関係を実現させることもできる。
また、本発明は上記実施形態とは逆に、
上型1の弾性体15,16をDUだけ圧縮する力の大きさ>下型2の弾性体17,18をDLだけ圧縮する力の大きさ
の関係を満たすように構成しても勿論よい。
【0036】
【発明の効果】
以上説明したように本発明によれば、幅広い材質、板厚にわたって滑らかで良好な切断面が得られ、切断刃の寿命が長い、硬質の合成樹脂材の切断方法を提供できる。
【図面の簡単な説明】
【図1】 本発明の切断方法に使用される切断型の平面図である。
【図2】 図1のA−A線断面図である。
【図3】 図1のB−B線断面図である。
【図4】 本発明の切断方法に使用される別の切断型を示し、図2に対応する断面図である。
【図5】 本発明の切断方法に使用される更に別の切断型を示し、図2に対応する断面図である。
【図6】 本発明の切断方法に使用される更に別の切断型を示し、図2に対応する断面図である。
【符号の説明】
1 上型
2 下型
3 上型基板
4 下型基板
5,6 刃物
7,8 刃物圧入部
9,11 貫通孔
10,12 溝
13,14 切欠き
15,16,17,18 弾性体
20 硬質の合成樹脂板
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cutting method for cutting a hard synthetic resin material into a desired shape.
[0002]
[Prior art]
A plate material made of a hard synthetic resin such as an acrylic resin is likely to crack when sheared at room temperature. When this type of synthetic resin sheet material is vacuum-formed or pressure-molded, the molding maker uses a standard-sized sheet material manufactured by the material maker by extrusion or casting, etc., and has a rectangular size according to the product shape. It is cut with a circular saw or a band saw and then secondary processed. Further, in the case of vacuum forming or pressure forming, the ear is cut after the forming process.
[0003]
According to the above manufacturing process,
・ Since ears and chips are generated, the material yield is low. ・ Productivity is low. (If the cutting shape is complicated, automation is difficult and the cutting speed is slow.)
・ There is an inconvenience of generating a large amount of chips that cannot be recycled.
[0004]
As a cutting method that does not generate chips, a cutting blade formed into a shape to be cut, and an upper die and a lower die in which an elastic body is arranged around the cutting blade, a resin plate is placed between the upper and lower die, and the resin A technique has been proposed in which a cutting blade is driven into the upper and lower surfaces of the plate and cut (Japanese Patent Laid-Open No. 7-285099). This technique is used for an expensive punching die having a blade made of cemented carbide or the like and having an upper and lower die made of steel or the like.
[0005]
[Problems to be solved by the invention]
When the present inventor applied and tested the above technique to acrylic resins having various thicknesses, the following matters became clear.
-The cutting surface consists of an upper blade biting portion, a crack portion, and a lower blade biting portion.
・ When the plate thickness increases, the surface of the crack becomes rough.
-While the cutting edge of the cutting blade is sharp, the surface of the crack portion is smooth, but when the cutting edge becomes dull, the surface of the crack portion becomes rough.
・ If the amount of rubber added to the acrylic resin is increased, defects such as cracks, chips and whiskers are less likely to occur.
-Acrylic resin with a small amount of added rubber greatly changes the roughness of the surface of the crack portion depending on cutting conditions such as the amount of biting by the cutting blade, the thickness of the elastic body, and the hardness.
And according to the said invention, since the abrasion and damage of the blade edge of a cutting blade generate | occur | produce comparatively early, in order to obtain a smooth cut surface, frequent replacement | exchange of a cutting blade is required. Moreover, there is a disadvantage that the roughness of the cut surface obtained varies greatly due to changes in the material and plate thickness of the synthetic resin.
[0006]
It is an object of the present invention to provide a method for cutting a hard synthetic resin material in which a smooth cut surface can be obtained over a wide range of materials and plate thicknesses, and the life of the cutting blade is long.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following means.
The present invention, blades are opposed to protrude from the upper surface of the lower surface and the lower die substrate of the upper die substrate, the elastic body thicker than the protruding height of the blade is disposed on both sides of each blade of the vertical, the It is a method of cutting hard synthetic resin material by driving the blade edge of the opposing blade into the upper and lower surfaces of the plate material, and at the time of cutting, the blade edge of one type of blade comes into contact with one surface of the plate material and bites into the plate material. Next, the cutting edge of the blade on the other side comes into contact with the surface of the plate material, bites into it, and brittle fracture occurs from the cutting edge of the cutting tool on the other side to the cutting edge of the cutting tool on the one side. In the method of generating and cutting the plate material ,
When the distance between the lower surface of the upper elastic body and the blade edge of the blade is DU, and the distance between the upper surface of the lower elastic body and the blade edge of the blade is DL, the magnitude of the force compressing the upper elastic body by DU; It is characterized in that the magnitude of the force compressing the lower elastic body by DL is different.
[0008]
The above relationship can be realized by any of the following means.
(1) With DU = DL, the hardness of the upper elastic body is made different from the hardness of the lower elastic body. For example, when DU = DL, the hardness of the upper elastic body is made lower than the hardness of the lower elastic body.
(2) The hardness of the upper elastic body and the hardness of the lower elastic body are the same, and the lengths of DU and DL are made different. For example, the hardness of the upper elastic body and the hardness of the lower elastic body are the same, and a relationship of DU <DL is established.
(3) The lengths of DU and DL are different, and the hardness of the upper elastic body is made different from the hardness of the lower elastic body. For example, when DU <DL, the hardness of the upper elastic body is made lower than the hardness of the lower elastic body.
[0009]
In order to satisfy the above relationship, the elastic body may have a laminated structure of at least two layers having different hardnesses.
[0011]
The curvature radius of bending deformation is preferably in the range of 300 to 800 mm.
[0012]
When a hard synthetic resin plate is placed between the upper mold and the lower mold of the above-mentioned cutting mold and the cutting edges of the opposing blades are driven into the upper and lower surfaces of the workpiece, the upper elastic body is compressed by DU. Since the magnitude of the force is different from the magnitude of the force that compresses the lower mold elastic body by DL, the cutting edge of one type of blade first comes into contact with one surface of the plate material and bites into the other surface. Protrusively bends and deforms. At this time, a tensile stress perpendicular to the cut surface acts on the other surface side of the plate material due to bending deformation. Further, when pressed, the blade edge of the blade on the other side comes into contact with the surface of the plate material, bites into it, and brittle fracture occurs from the blade edge of the blade on the other surface side toward the blade edge of the blade on one surface side. Is cut into a predetermined punching shape. In this way, when cutting, the blade is driven on one surface side of the plate material in a state where a tensile stress perpendicular to the cutting surface is applied, so that the blade on the other surface side is cut from the blade edge of the blade on the other surface side. Since cracks are continuously generated toward the cutting edge, a smooth and good cut surface can be obtained. Moreover, since the amount of biting of the upper and lower knives is shallow and can be cut, the life of the knives can be extended.
[0013]
In the above, as the hard synthetic resin, thermoplastics such as general-purpose plastics such as polyvinyl chloride, polypropylene, ABS, polyethylene terephthalate resin, acrylic resins, polystyrene resins, methacryl-styrene copolymer resins, and styrene-acrylonitrile copolymer resins. Examples thereof include resins, thermosetting resins, and engineering plastics.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment 1 of the present invention will be described with reference to FIGS. In the drawing, the positioning holes and the like are omitted, and the relationship between the blade and the elastic body is illustrated.
[0015]
The cutting mold includes an upper mold 1 and a lower mold 2. The materials of the upper mold substrate 3 and the lower mold substrate 4 that form the upper mold 1 and the lower mold 2 are made of an Al alloy. The cutting die according to the present embodiment cuts a plate material from the end into a strip shape, and includes straight strip-shaped blades 5 and 6.
[0016]
The upper die substrate 3 and the lower die substrate 4 have cutter press-fitting portions 7 and 8 into which straight strip-like cutters 5 and 6 are press-fitted. The cutter press-fitting portion 7 of the upper mold substrate 3 includes a plurality of slit-like through holes 9 arranged on a straight line at intervals, and a groove 10 formed on the lower surface of the substrate 3 between the through holes 9. Has been. The through hole 9 and the groove 10 are formed perpendicular to the substrate 3 and have the same press-fitting width. The cutter press-fit portion 8 of the lower mold substrate 4 is formed at a position facing the cutter press-fit portion 7 of the upper mold substrate 3 with a through hole 11 and a groove 12 having the same structure and size as the cutter press-fit portion 7 of the upper mold substrate 3. It is configured. The groove 12 is formed on the upper surface of the lower mold substrate 4.
[0017]
As the blades 5 and 6 fixed to the upper mold substrate 3 and the lower mold substrate 4, Thomson blades or the like for cutting paper, sheets, rubber, or the like can be used. Each of the cutters 5 and 6 is a strip-like cutter having substantially the same size as the cutter press-fitting portions 7 and 8 of the upper mold substrate 3 and the lower mold substrate 4, respectively, and the blade edge angle is generally 30 to 55 degrees. The smaller the blade edge angle is, the more suitable for cutting a thick plate, but the life of the blade edge is shortened. When the widths of the through holes 9 and 11 and the grooves 10 and 12 of the cutter press-fitting portions 7 and 8 of the upper mold substrate 3 and the lower mold substrate 4 are slightly smaller than the thickness of the cutters 5 and 6 (1/100 to 3/100 mm). The blades 5 and 6 are securely fixed to the upper die substrate 3 and the lower die substrate 4, respectively, and the position accuracy of the blade edge can be improved.
[0018]
The longitudinal lengths of the blades 5 and 6 are longer than the thicknesses of the upper die substrate 3 and the lower die substrate 4, respectively. It has notches 13 and 14. The notches 13 and 14 are formed corresponding to the positions of the grooves 10 and 12 of the cutter press-fitting portions 7 and 8 formed in the upper mold substrate 3 and the lower mold substrate 4. Therefore, in a state in which the cutters 5 and 6 are press-fitted and fixed to the cutter press-fitting portions 7 and 8 of the upper die substrate 3 and the lower die substrate 4, the notches 13 and 14 of the cutters 5 and 6 are the cutter press-fitting portion 7. 8 are press-fitted into the grooves 10 and 12, and the portions where the notches 13 and 14 are not formed are press-fitted into the through-holes 9 and 11 of the cutter press-fitting portions 7 and 8. At this time, the end surfaces of the blades 5 and 6 opposite to the blade edges are fixed so as to be flush with the end surfaces of the upper mold substrate 3 and the lower mold substrate 4, thereby positioning the blades 5 and 6 in the vertical direction. The cutting edges of the blades 5 and 6 are arranged to protrude from the upper mold substrate 3 and the lower mold substrate 4 by a predetermined length, respectively.
[0019]
The protruding heights of the blade edges of the blades 5 and 6 from the surfaces of the upper mold substrate 3 and the lower mold substrate 4 are in the range of 2.5 to 6.0 mm. If the protruding height of the cutters 5 and 6 is too high, the positional accuracy of the cutting edge is lowered. However, if the protruding height is too small, there will be inconvenience in the configuration of the guide pin for positioning the object to be cut and the elastic body described later. A more preferable protrusion height is 3.0 to 5.0 mm.
[0020]
On the lower surface of the upper mold substrate 3, elastic bodies 15 and 16 having the same shape and the same size are arranged and fixed on both side surfaces of the blade 5. The elastic bodies 15 and 16 have a rectangular plate shape, are made of an elastic material such as a rubber sponge, and have a thickness slightly thicker than the protruding height of the blade 5. On the upper surface of the lower mold substrate 4, elastic bodies 17 and 18 having the same shape and the same size are arranged and fixed on both side surfaces of the blade 6. The elastic bodies 17 and 18 have a rectangular plate shape, are made of an elastic material such as a rubber sponge, and have a thickness slightly thicker than the protruding height of the blade 6.
[0021]
Here, when the distance between the lower surface of the elastic bodies 15 and 16 of the upper mold 1 and the blade edge of the blade 5 is DU, and the distance between the upper surface of the elastic bodies 17 and 18 of the lower mold 2 and the blade edge of the blade 6 is DL,
The size of the force for compressing the elastic bodies 15 and 16 of the upper mold 1 by DU <the magnitude of the force for compressing the elastic bodies 17 and 18 of the lower mold 2 by DL.
[0022]
In the present embodiment, in order to satisfy the above relationship, the hardness of the elastic bodies 15 and 16 of the upper mold 1 is set lower than the hardness of the elastic bodies 17 and 18 of the lower mold 2 and DU = DL. The elastic bodies 15 and 16 of the upper mold 1 have a hardness of 15 and the elastic bodies 17 and 18 of the lower mold 2 have a hardness of 25. Such a relationship is effective when the plate material is relatively thin.
[0023]
2 and 3, a plate material 20 drawn between the upper mold 1 and the lower mold 2 represents a hard synthetic resin plate that is an object to be cut.
[0024]
Next, a method for cutting a hard synthetic resin plate using the cutting die will be described.
[0025]
The aforementioned cutting die is set in a mechanical press or a hydraulic press. A hard synthetic resin plate 20 is placed between the set upper die 1 and lower die 2, and the cutting edges of the opposed cutters 5 and 6 are driven into the upper and lower surfaces of the workpiece.
[0026]
At this time,
Since the magnitude of the force compressing the elastic bodies 15 and 16 of the upper mold 1 by DU <the magnitude of the force compressing the elastic bodies 17 and 18 of the lower mold 2 by DL, there is a relationship between the blade of the upper mold 1 first. The cutting edge 5 comes into contact with the upper surface of the plate member 20 and bites into the plate member 20, and the lower surface of the plate member 20 is bent and deformed. At this time, tensile stress perpendicular to the cut surface acts on the lower surface side of the plate member 20 due to bending deformation. Further, when pressed, the cutting edge of the cutting tool 6 of the lower mold 2 comes into contact with the lower surface of the plate member 20 and bites, and brittle fracture occurs from the cutting edge of the cutting tool 6 of the lower mold 2 toward the cutting edge of the cutting tool 5 of the upper mold 1. The plate material 20 is cut into a predetermined punching shape. It is desirable that the radius of curvature of the bending deformation of the plate member 20 when the cutting edge of the blade 6 of the lower mold 2 contacts is in the range of 300 to 800 mm.
[0027]
In this way, when cutting, the cutting tool 6 of the lower mold 2 is driven into the lower surface side of the plate member 20 in a state where a tensile stress perpendicular to the cutting surface is applied, so that the upper mold is moved from the cutting edge of the cutting tool 6 of the lower mold 2. Since cracks are continuously generated toward the cutting edge of one blade 5, a smooth and good cut surface can be obtained. Moreover, since the amount of biting of the cutters 5 and 6 of the upper mold 1 and the lower mold 2 is shallow and can be cut, the life of the cutters 5 and 6 can be extended.
[0028]
The cutting depth of the cutting edge into the workpiece is 0.2 to 0.7 mm above and below. If the driving depth is too small, a portion that cannot be cut may be generated. If the driving depth is too large, the life of the cutting edge is shortened. Further, it is recognized that the cutting surface property tends to be slightly better when the driving speed is higher. However, if the thickness of the object to be cut is in the range of 0.8 to 5.0 mm, cutting is possible within the range of the press speed of a normal mechanical press or a hydraulic press slower than this.
[0029]
When the upper mold 1 and the lower mold 2 are separated after cutting, the cutting material is separated from the cutting edges of the blades 5 and 6 by the restoring force of the compressed elastic bodies 15, 16, 17, and 18 to the original shape, It is placed on the elastic bodies 17 and 18 of the lower mold 2.
[0030]
The cutting materials are arranged in the order of the biting portion of the cutting tool 5 of the upper die 1, the crack portion, and the biting portion of the cutting tool 6 of the lower die 2, and the length of the biting portion of the cutting tool 5 of the upper die 1 is lower. It is larger than the length of the biting portion of the cutter 6 of the mold 2.
[0031]
FIG. 4 shows another embodiment 2 of the present invention. The second embodiment is different from the first embodiment only in the configuration of the elastic body, and the other configurations are the same. In the elastic body of the second embodiment, the hardness of the elastic bodies 15 and 16 of the upper mold 1 is lower than the hardness of the elastic bodies 17 and 18 of the lower mold 2 and DU <DL. The elastic bodies 15 and 16 of the upper mold 1 have a hardness of 15 and the elastic bodies 17 and 18 of the lower mold 2 have a hardness of 25. Such a relationship is effective when the plate material is thick.
[0032]
FIG. 5 shows still another embodiment 3 of the present invention. The third embodiment is different from the first embodiment only in the configuration of the elastic body, and the other configurations are the same. In the third embodiment, the elastic bodies 15 and 16 of the upper mold 1 and the elastic bodies 17 and 18 of the lower mold 2 are respectively formed in a two-layer laminated structure having different hardness. And the hardness of the elastic bodies 15 and 16 of the upper mold | type 1 is made lower than the hardness of the elastic bodies 17 and 18 of the lower mold | type 2, and it is DU = DL. One elastic body 15 of the upper mold 1 is formed by sequentially laminating an elastic body 15a (hardness 15) and an elastic body 15b (hardness 25) on the upper mold substrate 3, and the other elastic body 16 is also an elastic body 16a. (Hardness 15) and elastic body 16b (hardness 25) are formed on the upper mold substrate 3 in order. One elastic body 17 of the lower mold 2 is formed by sequentially laminating an elastic body 17a (hardness 35) and an elastic body 17b (hardness 25) on the lower mold substrate 4, and the other elastic body 18 is also an elastic body 18a. (Hardness 35) and an elastic body 18b (hardness 25) are formed on the lower mold substrate 4 in order.
[0033]
FIG. 6 shows yet another embodiment 4 of the present invention. The fourth embodiment is different from the first embodiment only in the configuration of the elastic body, and the other configurations are the same. In the fourth embodiment, the elastic bodies 15 and 16 of the upper mold 1 are formed of a single layer, and the elastic bodies 17 and 18 of the lower mold 2 are formed of a two-layer laminated structure having different hardnesses. And the hardness of the elastic bodies 15 and 16 of the upper mold | type 1 is made lower than the hardness of the elastic bodies 17 and 18 of the lower mold | type 2, and it is DU <DL. The hardness of the elastic bodies 15 and 16 of the upper mold 1 is a hardness of 25. One elastic body 17 of the lower mold 2 is formed by sequentially laminating an elastic body 17a (hardness 35) and an elastic body 17b (hardness 25) on the lower mold substrate 4, and the other elastic body 18 is also an elastic body 18a. (Hardness 35) and an elastic body 18b (hardness 25) are formed on the lower mold substrate 4 in order.
[0034]
When the cutting test of various acrylic resin plates with the thickness of 0.8 to 5 mm and the material of 0 to 30% of rubber was performed with the cutting die described above, an inexpensive Thomson blade was used. Nevertheless, a good cut surface was obtained even after cutting 30,000 times, and the effect of the present invention was confirmed.
[0035]
The present invention is not limited to the above embodiment. For example, when DU> DL, the hardness of the elastic bodies 15 and 16 of the upper mold 1 is made lower than the hardness of the elastic bodies 17 and 18 of the lower mold 2. By
It is also possible to realize the relationship of the magnitude of the force that compresses the elastic bodies 15 and 16 of the upper mold 1 by DU <the magnitude of the force that compresses the elastic bodies 17 and 18 of the lower mold 2 by DL.
Further, the present invention is contrary to the above embodiment,
Of course, the elastic bodies 15 and 16 of the upper mold 1 may be configured so as to satisfy the relationship of the magnitude of the force compressing the elastic bodies 17 and 18 of the lower mold 2 by DL.
[0036]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a method for cutting a hard synthetic resin material that can provide a smooth and good cut surface over a wide range of materials and plate thicknesses and has a long cutting blade life.
[Brief description of the drawings]
FIG. 1 is a plan view of a cutting die used in the cutting method of the present invention.
FIG. 2 is a cross-sectional view taken along line AA in FIG.
3 is a cross-sectional view taken along line BB in FIG.
FIG. 4 is a cross-sectional view corresponding to FIG. 2, showing another cutting die used in the cutting method of the present invention.
FIG. 5 is a sectional view corresponding to FIG. 2, showing still another cutting die used in the cutting method of the present invention.
FIG. 6 is a sectional view corresponding to FIG. 2, showing still another cutting die used in the cutting method of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Upper mold | type 2 Lower mold | type 3 Upper mold | type board | substrate 4 Lower mold | type board | substrate 5,6 Cutlery 7,8 Blade press-fit part 9,11 Through-hole 10,12 Groove 13,14 Notch 15,16,17,18 Elastic body 20 Hard body Synthetic resin board

Claims (7)

刃物が上型基板の下面と下型基板の上面から突出して対向配置され、前記上下の各刃物の両側面に刃物の突出高さよりも厚い厚さの弾性体が配置され、前記対向する刃物の刃先を板材の上下面に打ち込んで硬質の合成樹脂材を切断する方法であって、切断時、先に一方の型の刃物の刃先が板材の一面に接触し、食い込み、板材に曲げ変形を生じさせ、次に、他方の面側の刃物の刃先が板材の表面に接触し、食い込み、他方の面側の刃物の刃先から一方の面側の刃物の刃先に向かって脆性破壊を生じさせて板材を切断する方法において
上型の弾性体下面と刃物の刃先との距離をDU、下型の弾性体上面と刃物の刃先との距離をDLとしたとき、上型の弾性体をDUだけ圧縮する力の大きさと、下型の弾性体をDLだけ圧縮する力の大きさとが相違していることを特徴とする硬質の合成樹脂材の切断方法
Cutlery is arranged to protrude from the lower surface of the upper mold substrate and the upper surface of the lower mold substrate, and elastic bodies having a thickness thicker than the protruding height of the cutter are arranged on both side surfaces of the upper and lower blades. This is a method of cutting a hard synthetic resin material by driving the blade edge onto the upper and lower surfaces of the plate material. At the time of cutting, the blade edge of one type of blade comes into contact with one surface of the plate material, biting into it, and bending deformation occurs in the plate material. Next, the blade edge of the blade on the other surface side contacts the surface of the plate material, bites into the plate material, causing brittle fracture from the blade edge of the blade on the other surface side toward the blade edge of the blade on the one surface side. In the method of cutting
When the distance between the lower surface of the upper elastic body and the blade edge of the blade is DU, and the distance between the upper surface of the lower elastic body and the blade edge of the blade is DL, the magnitude of the force compressing the upper elastic body by DU; A method of cutting a hard synthetic resin material, characterized in that the magnitude of the force compressing the lower elastic body by DL is different.
DU=DLで、上型の弾性体の硬度と下型の弾性体の硬度とが相違していることを特徴とする請求項1記載の硬質の合成樹脂材の切断方法2. The method for cutting a hard synthetic resin material according to claim 1, wherein the hardness of the upper elastic body is different from the hardness of the lower elastic body when DU = DL. DUとDLの長さが相違し、上型の弾性体の硬度と下型の弾性体の硬度とが同一であることを特徴とする請求項1記載の硬質の合成樹脂材の切断方法2. The method for cutting a hard synthetic resin material according to claim 1, wherein the lengths of DU and DL are different, and the hardness of the upper elastic body and the hardness of the lower elastic body are the same. DUとDLの長さが相違し、上型の弾性体の硬度と下型の弾性体の硬度とが相違していることを特徴とする請求項1記載の硬質の合成樹脂材の切断方法2. The method for cutting a hard synthetic resin material according to claim 1, wherein the lengths of DU and DL are different, and the hardness of the upper elastic body and the hardness of the lower elastic body are different. 弾性体が、硬度が相違している少なくとも2層の積層構造を有していることを特徴とする請求項1〜4のいずれかに記載の硬質の合成樹脂材の切断方法The method for cutting a hard synthetic resin material according to any one of claims 1 to 4, wherein the elastic body has a laminated structure of at least two layers having different hardnesses. 刃物がトムソン刃であることを特徴とする請求項1〜5のいずれかに記載の硬質の合成樹脂材の切断方法 The cutting method for a hard synthetic resin material according to any one of claims 1 to 5, wherein the blade is a Thomson blade. 曲げ変形の曲率半径が300〜800mmの範囲であることを特徴とする請求項1〜6のいずれかに記載の硬質の合成樹脂材の切断方法。The method for cutting a hard synthetic resin material according to any one of claims 1 to 6, wherein a radius of curvature of bending deformation is in a range of 300 to 800 mm.
JP2000142999A 2000-05-16 2000-05-16 Cutting method of hard synthetic resin material Expired - Fee Related JP3790090B2 (en)

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