JPH0811062A - Polishing and finishing method for corner round face in square material product - Google Patents

Abstract

PURPOSE:To eliminate a ridge line between a corner round face and an adjacent plane part by matching an angle of inclination of the plane part in a square material product with an angle of deformation generated when the corner round face is pressed onto an abrasive sheet so as to carry out polishing in a flat part continuing to a recessed curve face part in the abrasive sheet. CONSTITUTION:While a polishing cylinder 1 is rotated, a plane part 42 of a square material product 4 is brought into contact with a flat part 22 from the beginning while being inclined at an angle theta of inclination equal to an angle theta of deformation to the surface of the polishing cylinder 1. Under this condition, the corner round face 41 is polished by means of a recessed curve face part 21 of an abrasive sheet 2 and the flat part 42 is polished by means of a flat part 22, while the square material product 4 is moved in the longitudinal direction. This action is repeated for several times, so that the corner round face 41 and the plane part 42 are polished by the flat part 22 continuing to the recessed curve face part 21, and as a result, no ridge line is generated between the corner round face 41 and the plane part 42.

Description

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

【０００１】[0001]

【産業上の利用分野】本発明は、椅子、テーブル、額縁
など、木工、プラスチックス、アルミ等の角材を用いた
製品の角Ｒ面を滑らかな曲面に加工する研磨仕上げ方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing finishing method for processing a corner R surface of a product, such as a chair, a table and a frame, which is made of wood such as woodwork, plastics and aluminum, into a smooth curved surface.

【０００２】[0002]

【従来の技術】従来、木工などの角材製品の角部は、手
ざわりをよくしたり、安全のために曲面に仕上げる。そ
の場合、角材製品の角部をあらかじめ粗仕上げ加工で円
弧で曲面を形成して角Ｒ面を形成し、そのあと、塗料の
付きがよくなるように塗装前の完成仕上げをする。その
角Ｒ面の完成仕上げ加工をする場合、例えば図４に示す
ように、ベルト状の布などに研磨材を貼り付けた研磨シ
ートＳを二つのプーリＰの間に巻き掛けた、いわゆるベ
ルトサンダーを使用し、そのプーリＰを回転して研磨シ
ートＳを移動させ、粗仕上げ加工の角Ｒ面Ｃを研磨シー
トＳの表面に当てながら、角材製品の角Ｒ面Ｃに続く平
面部Ａ，Ｂと研磨シートとのなす角度が変わるように、
角材製品Ｗを往復回動させ、かつ角材製品の長手方向に
移動して角Ｒ面Ｃの完成仕上げ加工をしていた。2. Description of the Related Art Conventionally, the corners of timber products such as woodworking are finished to have curved surfaces for a good texture and for safety. In that case, the corners of the square wood product are rough-finished in advance to form curved surfaces with circular arcs to form corner R surfaces, and then finish finish before coating so that the coating is well adhered. When finishing the corner R surface, for example, as shown in FIG. 4, a so-called belt sander in which an abrasive sheet S in which an abrasive material is attached to a belt-like cloth is wound around two pulleys P is used. While rotating the pulley P, the polishing sheet S is moved, and the corner R surface C of the rough finishing is applied to the surface of the polishing sheet S, the flat surface portions A and B following the corner R surface C of the square wood product are used. So that the angle between the and polishing sheet changes
The square product W was reciprocally rotated and moved in the longitudinal direction of the square product to finish and finish the corner R surface C.

【０００３】[0003]

【発明が解決しようとする課題】ところが、従来技術で
は、角材製品の角Ｒ面を研磨シートによって研磨すると
き、研磨シートは角材製品の角Ｒ面に押し付けられて僅
かに湾曲するが、ほぼ平面状態で角Ｒ面に当たるため、
角Ｒ面は平坦に研磨され、角Ｒ面に隣接する平面部と研
磨面との境に稜線ができて滑らかにならない。そのた
め、何回も研磨シートと角材製品との角度を僅かづつ変
えて角Ｒ面を研磨する稜線を除去する必要があるため、
研磨仕上げに熟練した作業員が必要であり、自動化が難
しく、多くの時間を必要とするという欠点があった。と
くに角材製品の長手方向に湾曲しているものでは、手作
業で平面部と角Ｒ面を連続した面に仕上げることは極め
て難しく、多くの時間を要していた。本発明は、短時間
に稜線が生じない滑らかな曲面を角Ｒ面に形成する研磨
仕上げ方法を提供することを目的とするものである。However, according to the prior art, when the corner R surface of a square timber product is ground by a polishing sheet, the polishing sheet is pressed against the corner R surface of the square timber product and slightly curved, but it is almost flat. Since it hits the corner R surface in the state,
The corner R surface is ground flat, and a ridgeline is formed at the boundary between the flat surface portion adjacent to the corner R surface and the polishing surface, which is not smooth. Therefore, it is necessary to change the angle between the polishing sheet and the square wood product little by little to remove the ridge line for polishing the corner R surface.
There is a drawback that a skilled worker is required for polishing and finishing, automation is difficult, and much time is required. In particular, in the case of a square wood product which is curved in the longitudinal direction, it is extremely difficult to manually finish the flat surface and the corner R surface into a continuous surface, which requires a lot of time. An object of the present invention is to provide a polishing finishing method for forming a smooth curved surface on a corner R surface in which a ridgeline does not occur in a short time.

【０００４】[0004]

【課題を解決するための手段】上記問題を解決するた
め、本発明は、粗仕上げにより角部を曲面に加工した角
材製品の角Ｒ面の研磨仕上げ方法において、弾性を有す
る円筒部の表面に研磨シートを貼り付けた研磨筒を設
け、前記角材製品の前記角Ｒ面を前記研磨シートに押し
付けた時に変形によって生じる変形部分の平坦部が前記
研磨シートの円筒表面に対して傾斜する変形角度とする
とき、角Ｒ面に稜線を生じない適切な変形角度を求め、
前記研磨筒を回転しながら、前記角材製品の角Ｒ面に隣
接する平面部の前記研磨シートの円筒表面に対する傾斜
角度を前記適切な変形角度にほぼ一致させた状態で、前
記角Ｒ面と前記平面部とを前記研磨シートに押し付けて
研磨するものである。In order to solve the above problems, the present invention provides a method for polishing and finishing a corner R surface of a square timber product in which a corner portion is processed into a curved surface by rough finishing. A polishing cylinder to which a polishing sheet is attached is provided, and a deformation angle at which a flat portion of a deformed portion caused by deformation when the corner R surface of the square wood product is pressed against the polishing sheet is inclined with respect to the cylindrical surface of the polishing sheet. When doing, find an appropriate deformation angle that does not create a ridgeline on the R surface,
While rotating the polishing cylinder, the inclination angle of the flat surface portion adjacent to the corner R surface of the square timber product with respect to the cylindrical surface of the polishing sheet substantially matches the appropriate deformation angle, The flat portion is pressed against the polishing sheet to polish.

【０００５】[0005]

【作用】上記手段により、角材製品の平面部を研磨筒の
表面に対して、研磨シートを押し付けた時に変形して生
じる変形部分の変形角度θだけ傾斜させて、平坦部に接
触させ、角Ｒ面を研磨シートの曲面部で研磨すると共に
平坦部で平面部を研磨する。これにより、角Ｒ面と平面
部は曲面部と連続している平坦部によって研磨されるの
で、角Ｒ面と平面部との間に稜線は生じない。By the above means, the flat portion of the square wood product is inclined with respect to the surface of the polishing cylinder by the deformation angle θ of the deformed portion generated when the polishing sheet is pressed and brought into contact with the flat portion. The surface is polished by the curved surface portion of the polishing sheet and the flat portion is polished by the flat portion. As a result, the corner R surface and the flat surface portion are polished by the flat portion that is continuous with the curved surface portion, so that no ridge line is formed between the corner R surface and the flat surface portion.

【０００６】[0006]

【実施例】以下、本発明を図に示す実施例について説明
する。図１は本発明の実施例を示す側断面図である。図
において、１は円筒状の研磨筒、１１はスポンジ状の弾
性を有する材料からなる円筒部、２は円筒部１１の表面
に貼り付けた研磨シート、３は回転軸で円筒部１１を回
転するようにしてある。４は角材製品、４１はあらかじ
め粗仕上げ加工した角Ｒ面、４２、４３は角Ｒ面４１の
両側に続く平面部である。角材製品４の角Ｒ面４１を仕
上げる場合、図１（ａ）に示すように、研磨筒１を回転
させ、角Ｒ面４１を研磨筒１の表面に設けた研磨シート
２に押し付ける。このとき研磨シート２は弾性を有する
円筒部１１の上に設けられているので、図２（ａ）に拡
大して示すように、角Ｒ面４１に接触する研磨シート２
の接触部分は凹曲面部２１を形成し、凹曲面部２１は角
Ｒ面４１に倣って変形する。凹曲面部２１に隣接して角
Ｒ面４１から離れる平坦部２２、２３は研磨筒１の表面
に対して変形角度θだけ傾斜してほぼ直線的に変形し、
研磨シート２の変形が無い円筒表面２４につながる。も
し、平面部４２、４３が平坦部２２、２３に接触しない
場合は、凹曲面部２１で研磨された角Ｒ面４１と研磨シ
ート２に接触しない平面部４２または４３との境に稜線
が生じる。したがって、研磨筒１を回転した状態で、最
初から角材製品４の平面部４２を研磨筒１の表面に対し
て変形角度θと同じ傾斜角度θだけ傾斜させて平坦部２
２に接触させる。この状態で、角材製品４を長手方向に
移動させながら、角Ｒ面４１を研磨シート２の凹曲面部
２１で研磨すると共に平坦部２２で平面部４２を研磨す
る。この動作を２〜３回繰り返すことにより、角Ｒ面４
１と平面部４２は凹曲面部２１と連続している平坦部２
２によって研磨されるので、角Ｒ面４１と平面部４２と
の間に稜線は生じない。なお、このとき、角Ｒ面４１と
平面部４３との間には僅かに稜線を生じることがある。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing an embodiment of the present invention. In the figure, 1 is a cylindrical polishing cylinder, 11 is a cylindrical portion made of a sponge-like material having elasticity, 2 is a polishing sheet attached to the surface of the cylindrical portion 3, and 3 is the rotating shaft for rotating the cylindrical portion 11. Is done. Reference numeral 4 is a square product, 41 is a corner R surface that has been rough-finished in advance, and 42 and 43 are flat surface portions continuing to both sides of the corner R surface 41. When finishing the corner R surface 41 of the timber product 4, the polishing cylinder 1 is rotated and the corner R surface 41 is pressed against the polishing sheet 2 provided on the surface of the polishing cylinder 1 as shown in FIG. At this time, since the polishing sheet 2 is provided on the elastic cylindrical portion 11, as shown in the enlarged view of FIG.
The contacting portion of forms a concave curved surface portion 21, and the concave curved surface portion 21 is deformed following the corner R surface 41. The flat portions 22 and 23 adjacent to the concave curved surface portion 21 and separated from the corner R surface 41 are inclined substantially at a deformation angle θ with respect to the surface of the polishing cylinder 1 and are deformed substantially linearly.
The polishing sheet 2 is connected to the undeformed cylindrical surface 24. If the flat portions 42 and 43 do not contact the flat portions 22 and 23, a ridge line is formed between the corner R surface 41 polished by the concave curved surface portion 21 and the flat portion 42 or 43 that does not contact the polishing sheet 2. . Therefore, in the state where the polishing cylinder 1 is rotated, the flat portion 42 of the square wood product 4 is inclined from the beginning with the same inclination angle θ as the deformation angle θ with respect to the surface of the polishing cylinder 1.
Contact 2. In this state, the square R surface 41 is polished by the concave curved surface portion 21 of the polishing sheet 2 and the flat surface portion 42 is polished by the flat portion 22 while moving the square wood product 4 in the longitudinal direction. By repeating this operation 2 to 3 times, the corner R surface 4
1 and the flat portion 42 are flat portions 2 continuous with the concave curved portion 21.
Since it is polished by 2, no ridgeline is formed between the corner R surface 41 and the flat surface portion 42. At this time, a slight ridge may be formed between the corner R surface 41 and the flat surface portion 43.

【０００７】次に、図１（ｂ）および図２（ｂ）に示す
ように、角材製品４を傾動し、反対側の平面部４３を研
磨筒１に対して傾斜角度θだけ傾斜させて、平坦部２３
に接触させる。この状態で、平面部４２の場合と同様
に、角Ｒ面４１を研磨シート２の凹曲面部２１で研磨す
ると共に平坦部２３で平面部４３を研磨する。これによ
り、同様に角Ｒ面４１と平面部４３は凹曲面部２１と連
続している平坦部２３によって研磨されるので、角Ｒ面
４１と平面部４３との間に稜線は生じない。また、角Ｒ
面４１と平面部４２を研磨した時に僅かに生じた稜線も
同時に除去され、平面部４２、角Ｒ面４１および平面部
４３にわたって連続した仕上げ面を得ることができる。
なお、角Ｒ面の曲率半径が５ｍｍ、研磨筒１の円筒部１
１のスポンジ材料が１０００ｇの押し付け力で５〜８ｍ
ｍの変形を生じるもので実験した。その結果、角Ｒ面４
１を研磨シート２に押し付けて変形した押し込み量が２
〜４ｍｍの時、研磨シート２の平坦部２２、２３の変形
角度θは２０〜３５°となった。それで、角材製品４の
平面部４２、４３を研磨シート２の表面に対し２０〜３
５°傾けて仕上げ加工すると、平面部４２、角Ｒ面４１
および平面部４３に稜線が生じないことを確認した。こ
れは、スポンジ材料と研磨シートの合成ばね定数が、直
線性を保てる範囲は、安定して研磨加工ができることを
示している。このように、円筒部１１の材質によって角
Ｒ部を研磨シートに押し付けた時の平坦部の変形角度θ
を求め、角材製品４をロボット（図示しない）によって
把持させ、傾斜角度θで角Ｒ面４１を研磨シート２に押
し付けて仕上げ加工することにより、稜線の生じない角
Ｒ面の研磨仕上げ加工を自動化することができる。な
お、円筒部を角Ｒ部によって押し付けた時に生じる変形
角度θは、実験によって求まるが、一例として円筒部を
固さが異なる３種類のスポンジで形成し、それぞれ曲率
半径が５ｍｍの丸棒を円筒部に押し付け、押し付け力と
変形量との関係、およびスポンジの固さと変形角度との
関係を求めた。その結果、図３に示すように、変形量δ
はほぼ押し付け力Ｆに比例し、変形角度θは押し付け力
Ｆに対しては大きく変化はしないことがわかった。ま
た、固さが大きくなるにしたがって、変形角度θは小さ
くなるが、ほぼ２０〜３５°の範囲に入っていた。この
ことから、円筒部の材質を決めることにより、スポンジ
材料と研磨シートの合成ばね定数が、直線性を保てる変
形角度をあらかじめ求めることができる。Next, as shown in FIGS. 1 (b) and 2 (b), the square wood product 4 is tilted, and the flat portion 43 on the opposite side is tilted with respect to the polishing cylinder 1 by a tilt angle θ, Flat part 23
Contact. In this state, as in the case of the flat portion 42, the corner R surface 41 is polished by the concave curved surface portion 21 of the polishing sheet 2 and the flat portion 43 is polished by the flat portion 23. Accordingly, the corner R surface 41 and the flat surface portion 43 are similarly polished by the flat portion 23 continuous with the concave curved surface portion 21, so that no ridgeline is generated between the corner R surface 41 and the flat surface portion 43. Also, the angle R
Ridges slightly generated when the surface 41 and the flat portion 42 are polished are also removed at the same time, and a continuous finished surface can be obtained over the flat portion 42, the corner R surface 41, and the flat portion 43.
In addition, the radius of curvature of the corner R surface is 5 mm, and the cylindrical portion 1 of the polishing cylinder 1
Sponge material of 1 is 5-8m with pressing force of 1000g
Experiments were conducted with a deformation of m. As a result, corner R surface 4
1 is pressed against the polishing sheet 2 and the deformation amount is 2
When it was ˜4 mm, the deformation angle θ of the flat portions 22, 23 of the polishing sheet 2 was 20 to 35 °. Therefore, the flat surface portions 42 and 43 of the timber product 4 are placed on the surface of the polishing sheet 2 by 20 to 3
When finished by inclining 5 °, the flat surface portion 42 and the corner R surface 41
It was also confirmed that no ridgeline was formed on the flat surface portion 43. This indicates that the polishing process can be stably performed within the range where the composite spring constant of the sponge material and the polishing sheet can maintain linearity. Thus, depending on the material of the cylindrical portion 11, the deformation angle θ of the flat portion when the corner R portion is pressed against the polishing sheet
Then, the square-shaped product 4 is grasped by a robot (not shown), and the corner R surface 41 is pressed against the polishing sheet 2 at an inclination angle θ to finish the processing, whereby the polishing and finishing of the corner R surface without the ridge line is automated. can do. The deformation angle θ generated when the cylindrical portion is pressed by the corner R portion is obtained by an experiment, but as an example, the cylindrical portion is formed by three kinds of sponges having different hardness, and each round bar having a radius of curvature of 5 mm is formed into a cylindrical shape. Then, the relationship between the pressing force and the deformation amount and the relationship between the hardness of the sponge and the deformation angle were obtained. As a result, as shown in FIG.
Was almost proportional to the pressing force F, and the deformation angle θ was not significantly changed with respect to the pressing force F. Further, as the hardness increased, the deformation angle θ decreased, but it was in the range of approximately 20 to 35 °. From this, by determining the material of the cylindrical portion, it is possible to previously obtain the deformation angle at which the synthetic spring constant of the sponge material and the polishing sheet can maintain linearity.

【０００８】[0008]

【発明の効果】以上述べたように、本発明によれば、角
Ｒ面を研磨シートに押し付けてできる変形角度に角材製
品の平面部の傾斜角度を合わせて、研磨シートの凹曲面
部と連続している平坦部によって研磨するので、角Ｒ面
とそれに隣接する平面部との境に稜線が生じることが無
くなる。また、傾斜角度をあらかじめ求めておくことに
より、ロボットなどにより角材製品の姿勢を制御し、常
に角材製品の平面部の傾斜角度を研磨シートの変形角度
に合わせることにより、加工時間を短くし、研磨仕上げ
加工の自動化が可能となる効果がある。As described above, according to the present invention, the inclination angle of the flat surface portion of the timber product is matched with the deformation angle formed by pressing the R-shaped surface against the polishing sheet, so that it is continuous with the concave curved surface portion of the polishing sheet. Since the polishing is performed by the flat portion that is formed, the ridge line is not formed at the boundary between the corner R surface and the flat portion adjacent thereto. In addition, by obtaining the tilt angle in advance, the posture of the timber product can be controlled by a robot, etc., and by always adjusting the tilt angle of the flat surface of the timber product to the deformation angle of the polishing sheet, the processing time can be shortened and The effect is that the finishing process can be automated.

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

【図１】 本発明の実施例を示す斜視図である。FIG. 1 is a perspective view showing an embodiment of the present invention.

【図２】 本発明の実施例の研磨シートと角材製品の位
置関係を示す拡大図である。FIG. 2 is an enlarged view showing a positional relationship between a polishing sheet and a square wood product according to an embodiment of the present invention.

【図３】 材質がスポンジの場合の押し付け力と変形角
度との関係を示すグラフである。FIG. 3 is a graph showing the relationship between the pressing force and the deformation angle when the material is sponge.

【図４】 従来例を示す側面図である。FIG. 4 is a side view showing a conventional example.

【符号の説明】[Explanation of symbols]

１ 研磨筒、１１ 円筒部、２研磨シート、２１ 凹曲
面部、２２、２３ 平坦部、３ 回転軸、４ 角材製
品、４１ 角Ｒ面、４２、４３ 平面部DESCRIPTION OF SYMBOLS 1 polishing cylinder, 11 cylindrical part, 2 polishing sheet, 21 concave curved surface part, 22, 23 flat part, 3 rotating shaft, 4 square material product, 41 square R surface, 42, 43 flat surface part

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】 粗仕上げにより角部を曲面に加工した角
材製品の角Ｒ面の研磨仕上げ方法において、弾性を有す
る円筒部の表面に研磨シートを貼り付けた研磨筒を設
け、前記角材製品の前記角Ｒ面を前記研磨シートに押し
付けた時に変形によって生じる変形部分の平坦部が前記
研磨シートの円筒表面に対して傾斜する変形角度とする
とき、角Ｒ面に稜線を生じない適切な変形角度をあらか
じめ求め、前記研磨筒を回転しながら、前記角材製品の
角Ｒ面に隣接する平面部の前記研磨シートの円筒表面に
対する傾斜角度を前記適切な変形角度にほぼ一致させた
状態で、前記角Ｒ面と前記平面部とを前記研磨シートに
押し付けて研磨することを特徴とする角材製品の角Ｒ面
の研磨仕上げ方法。1. A method for polishing and finishing a corner R surface of a square-shaped product, the corner of which is processed into a curved surface by rough finishing, wherein a polishing cylinder having an abrasive sheet attached to the surface of a cylindrical portion having elasticity is provided, When the flat portion of the deformed portion generated by the deformation when the corner R surface is pressed against the polishing sheet has a deformation angle that is inclined with respect to the cylindrical surface of the polishing sheet, an appropriate deformation angle that does not generate a ridge line on the corner R surface. Is obtained in advance, while the polishing cylinder is rotated, the angle of inclination of the plane portion adjacent to the corner R surface of the timber product with respect to the cylindrical surface of the polishing sheet substantially matches the appropriate deformation angle, A method for polishing and finishing a corner R surface of a timber product, which comprises pressing the R surface and the flat surface portion against the polishing sheet for polishing. 【請求項２】 前記角Ｒ面に隣接する一方の平面部の前
記研磨シートの表面に対する傾斜角度を前記変形角度に
ほぼ一致させた状態で、前記角Ｒ面と前記角Ｒ面の一方
に隣接する前記平面部とを前記研磨シートに押し付けて
研磨した後、前記角Ｒ面に隣接する他方の平面部の前記
研磨シートの円筒表面に対する傾斜角度を前記変形角度
にほぼ一致させた状態で、前記角Ｒ面と前記角Ｒ面の他
方に隣接する前記平面部とを前記研磨シートに押し付け
て研磨する請求項１記載の角材製品の角Ｒ面の研磨仕上
げ方法。2. The corner R surface and one of the corner R surfaces are adjacent to each other in a state where an inclination angle of one flat surface portion adjacent to the corner R surface with respect to the surface of the polishing sheet is substantially matched with the deformation angle. After pressing and polishing the flat portion against the polishing sheet, the tilt angle of the other flat portion adjacent to the corner R surface with respect to the cylindrical surface of the polishing sheet is substantially equal to the deformation angle. The method for polishing and finishing a corner R surface of a square timber product according to claim 1, wherein the corner R surface and the flat surface portion adjacent to the other of the corner R surfaces are pressed against the polishing sheet and polished.