JP4244012B2 - Method for forming curved groove in wood board - Google Patents

Description

  The present invention relates to a method for forming a curved groove on a wooden board used for floor boards, wall boards, ceilings, etc., and in particular, after forming a groove on the surface of the wooden board, the groove edge is pressed by pressing the opening edge of the groove. The present invention relates to a curved groove forming method for forming an outwardly convex curved surface on the opening side.

As a method for forming a curved groove on a wooden board, for example, in a wooden board made of a substrate and a decorative material attached to the surface thereof, a V-shaped groove extending from the surface to the substrate is formed by cutting or embossing. The following Patent Documents 1 and 2 propose a method of forming a convex curved surface outward by pressing a fixed mold or a rotating roll against the opening edge of the groove.
JP 2001-207629 A JP 2003-326507 A

  In the conventional method for forming a curved groove on a wooden board, the curved surface is formed on the groove opening edge by pressing the pressing surface of a fixed mold or a rotating roll against the groove opening edge. There is a problem that a smooth curved surface with the same shape is not necessarily formed due to variations in the plate thickness and its length direction, the shape of the pressing surface of the fixed mold or rotating roll, the pressing force, and other conditions.

  Therefore, the problem to be solved by the present invention is to provide a novel technique that can always form a smooth curved surface with substantially the same shape when processing the curved opening edge of the groove of the wooden board.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a method for forming a curved groove on a wooden board, wherein a groove is formed on the surface of the wooden board and then the opening edge of the groove is pressed by pressing the opening edge of the groove. In the method of forming an outwardly convex curved surface, a processing device having a reference surface is arranged with the reference surface facing upward, and the surface of the wooden board is in contact with the reference surface During the conveyance, a pressing roll that presses the opening edge of the groove formed on the surface of the wood board is pressed upward to form an outwardly convex curved surface at the opening edge of the groove. Yes.

  According to this method, the wooden board is transported in contact with the grooved surface of the processing apparatus so that the grooved surface faces downward with respect to the reference surface of the processing apparatus. The positioning of the roll is also performed by adjusting the amount of protrusion that enters upward from the reference surface. Therefore, the groove opening edge on the surface of the wood board is always positioned at a constant position and pressed with a constant pressing force by a pressing roll adjusted to a desired protruding amount, and has almost the same shape and smoothness without any fuzz or flaking. Curved surface processing is performed.

  In addition, even if there is a variation in the thickness in the groove direction (longitudinal direction) of the wooden board, the surface of the wooden board is always positioned in contact with the reference plane, so it is hardly affected by the fluctuation in the thickness. A smooth curved surface processing with substantially the same shape is performed with a constant pressing force.

  In addition, when a curved board is processed by changing the surface of a wood board having a certain thickness, for example, 9 mm, to a curved board after changing to another board thickness, for example, 12 mm. Since the surface is always located on the reference surface, the same groove curved surface machining can be performed with the setting as it is without performing the positioning of the pressing roll and the adjustment of the protrusion amount again, and the machining efficiency is good.

  The wood board is, for example, plywood having a thickness of about 2.0 to 15 mm, laminated board, single board laminate (LVL), particle board, soft fiber board (insulation board), medium fiber board (MDF), hard fiber It may be a fiber board such as a board (hard board) or the like, with a decorative sheet attached to the surface thereof.

  The groove formed on the surface of the wood board is preferably symmetrical with respect to the center line in the cross-sectional shape, and is formed as, for example, a V-shaped groove. The curved surface formed at the opening edge of the groove is an arc, an ellipse, a parabola, or the like, and has a cross-sectional shape that protrudes outward.

  The processing apparatus used to form the curved surface of the wooden board has an upward reference surface, and conveys the wooden board by contacting the reference surface with the surface of the wooden board facing downward. The processing apparatus further includes a pressing roll for pressing the opening edge of the groove to form a convex curved surface. The pressing roll is rotatably supported and is pressed against the groove opening edge on the surface of the wooden board and rotates together with the transportation of the wooden board.

  The pressing surface of the pressing roll is preferably formed in a bilaterally symmetric shape, and the bilaterally symmetrical opening edge of the groove can be processed simultaneously. The pressing surface of the pressing roll can be a pair of inclined surfaces whose apex angle is a predetermined angle larger than the opening angle of the V-shaped groove, but a curved surface shape that bulges outward or a curved surface that dents inward. It may be a shape.

  In addition, if the pressing process is performed in a plurality of stages using a plurality of pressing rolls, the convex curved surface can be formed smoothly. However, the larger the number of stages, the more labor is required, so it is preferable to set the number of stages appropriately. . When performing press processing in multiple stages with a plurality of press rolls, press processing is performed using a plurality of press rolls having different apex angles formed by a pair of press surfaces in order of increasing apex angles.

  Furthermore, the processing apparatus preferably has a pressing roll that presses down the wooden board conveyed while the surface is in contact with the reference surface from the surface (back surface) opposite to the surface. It is preferable that the pressing roll is urged downward by a spring or the like.

  According to the present invention, when a groove opening edge on the surface of a wooden board is processed into a convex curved surface, a curved surface having substantially the same shape can be smoothly formed with a constant pressing force. In addition, according to the curved surface groove forming method of the wood board according to the present invention, since the convex curved surface is formed smoothly, there are no defects such as fluffing and fluffing, and the paint flows well during painting and the paintability is good. In addition to being good, when this wood board is used as a floor board, there is no catch of socks or stockings and the walking feeling is also good.

  In addition, even if there is a variation in the thickness of the wooden board in the groove direction (longitudinal direction), the surface of the wooden board is always positioned in contact with the reference surface, so it is hardly affected by the thickness variation. A smooth curved surface processing with substantially the same shape is performed with a constant pressing force.

  Even when convex curved surface processing is applied to another wooden board with a different thickness, the surface of the wooden board is always located on the reference plane regardless of the board thickness, so the positioning of the pressing roll and the adjustment of the protrusion amount are performed again. Even if not, the same groove curved surface processing can be performed with the setting as it is, and the processing efficiency is good.

  FIG. 1 and FIG. 2 are a front sectional view and a partial side sectional view showing a processing apparatus 10 for carrying out a method for forming a groove in a wooden board according to the present invention together with the wooden board 1.

  The processing apparatus 10 includes pressing rolls 11 and 11 for pressing the opening edge of the V groove 4 to form a convex curved surface. The pressing roll is used by setting the same number as the number of V grooves 4 formed on the surface of the wooden board 1. Although details will be described later with reference to FIGS. 4 to 7, a plurality of types of pressing roll pairs (or sets) having different apex angles are arranged in the conveying direction of the wooden board 1 (direction of arrow A in FIG. 2). Are arranged in order of gradually increasing. In this embodiment, three types of pressing rolls 11a, 11a: 11b, 11b: 11c, and 11c having different apex angles are used in pairs, each having the same number as the number of the V-grooves 4. FIG. Although the pressing roll 11a is shown, the other pressing rolls 11b and 11c have substantially the same configuration. The pressing rolls 11a, 11a: 11b, 11b: 11c, 11c are all non-driven and rotatable.

  Furthermore, the processing apparatus 10 has a support roll 15 and a chain conveyor 16 that support the wooden board 1. The upper surface of the support roll 15 and the upper surface of the chain conveyor 16 have the same height, and a reference surface 17 for supporting the wood board 1 is provided by these upper surfaces. A plurality of support rolls 15 are arranged side by side in the conveying direction of the wooden board 1 (indicated by an arrow A in FIG. 2), and when the wooden board 1 is conveyed in the arrow A direction by the chain conveyor 16, the supporting roll 15 is moved in the arrow B direction. Assists conveyance while rotating freely. Both the support roll 15 and the chain conveyor 16 are supported by the frame of the processing apparatus 10.

  Furthermore, the processing apparatus 10 includes a pressing roll 19 that presses down the back surface of the wooden board 1 placed on the reference surface 17. In the illustrated embodiment, pressing rolls 19 are provided at four positions in front view. A plurality of pressing rolls 19a, 19a on both sides are provided at positions substantially opposite to the chain conveyor 16 with appropriate intervals in the transport direction A, and the upper surface (back surface) of the wooden board 1 transported in the direction of arrow A by the chain conveyor 16 Freely rotates in the direction of arrow C while touching. The center pressing rolls 19b, 19b are provided at positions substantially opposite to the pressing rolls 11a, 11a: 11b, 11b: 11c, 11c, and similarly, the upper surface of the wooden board 1 conveyed in the direction of arrow A by the chain conveyor 16 It rotates freely in the direction of arrow D while contacting the (back surface). Each pressing roll 19a, 19b is urged downward by a coil spring (not shown) or the like.

Among the above-described three types of pressing rolls 11a, 11a: 11b, 11b: 11c, 11c, the pressing rolls 11a, 11a arranged on the most upstream side in the conveying direction of the wooden board 1 have an apex angle of the peripheral surface α ₁ The press rolls 11b and 11b arranged at the intermediate positions have conical press surfaces 12b and 12b whose apex angle is α _2. is a pressing roll 11c that is disposed on the most downstream side, 11c are conical pressing surface 12c of the peripheral surface and ₃ the apex angle alpha, which is assumed to have the 12c (FIG. 1, FIGS. 4 6) These apex angles α ₁ , α _2, and α ₃ satisfy the relationship of the included angle of the V-groove 4 (90 ° in this embodiment) <α ₁ <α ₂ <α ₃ <180 °. As the pressing process is performed in multiple stages, the convex curved surface can be formed more smoothly. However, since the process by the multi-stage process becomes complicated, in this embodiment, three types of pressing rolls 11a, 11a: 11b, 11b: 11c, 11c are arranged in the conveying direction of the wooden board 1 so that the apex angle gradually increases, and three-stage pressing is performed. Since the pressing surfaces 12a, 12a: 12b, 12b: 12c, 12c of the pressing rolls 11a, 11a: 11b, 11b: 11c, 11c are conical and symmetrical with respect to the cross-sectional shape of the groove 4, the groove 4 The left and right opening edges can be curved at the same time. The pressing rolls 11a, 11a: 11b, 11b: 11c, 11c are rotatably positioned at positions corresponding to the grooves 4, 4 by inserting the collar 14 into the shaft 13.

That is, in the process in which the wooden board 1 is conveyed in the direction of the arrow A by the chain conveyor 16, first, the apex angle α that is larger than the angle of the V-groove 4 already formed by an arbitrary method (90 ° in this embodiment). ₁ is inserted into each V-groove 4, and the pressing surface 12a is pressed against the opening edge of the V-groove 4 (FIG. 4). Then, at a position downstream in the conveying direction A than the pressing rolls 11a, alpha second conical pressing roll 11b having a large apex angle alpha ₂ than ₁ is inserted into the V-groove 4, the V-groove 4 and the pressing surface 12b It presses against the opening edge of and press-processes (FIG. 5). Finally, at a position downstream in the conveying direction A than the pressing roll 11b, and inserts the third conical pressing roll 11c having a large apex angle alpha ₃ even more alpha ₂ in the V-groove 4, the pressing surface 12c V The pressing process is performed by pressing against the opening edge of the groove 4 (FIG. 6). Since the pressing rolls 11a, 11b, and 11c are all non-driven and freely rotatable, the pressing rolls 11a, 11b, and 11c are pressed into the V-groove 4 of the wooden board 1 that is conveyed in the conveying direction A, and are pressed while rotating in the arrow E direction. Perform (Figure 2). Further, since the tips of the pressing rolls 11a, 11b, and 11c are all at the position coincident with the bottom tip position of the V-groove 4, both of the V-groove 4 are formed by the pressing surfaces 12a, 12b, and 12c of the pressing rolls 11a, 11b, and 11c. The opening edge can be pressed simultaneously. In this way, the opening edge of the V-shaped groove 4 is formed on the convex curved surface 7 as shown in FIG.

  As shown in FIG. 3, the wood board 1 used in this embodiment has a decorative sheet 3 on the surface of a base material 2 made of, for example, a plywood having a thickness of about 12 mm, a medium fiber board (MDF), or a laminated board thereof. The V-groove 4 is formed in advance by an arbitrary method so that the floor material is affixed and the width of the wood board 1 is divided into approximately three equal parts. A male fruit 5 and a female fruit 6 are formed on the quadrilateral lip of the base material 2, and the wooden boards 1 are connected to each other in the longitudinal direction (vertical direction on the paper surface) and the short side direction (left and right direction on the paper surface) through the actual fitting. The floor construction is done by joining. The decorative sheet 3 can use, for example, natural veneer obtained by cutting natural wood, artificially produced artificial veneer, non-woven fabric, paper, synthetic resin, etc., and can print various wood grain patterns and other patterns It is good to have done. The thickness of the decorative sheet 3 is, for example, about 0.05 to 1 mm.

FIG. 8 shows the manufacturing process of this wooden board 1, and the fruits 5 and 6 are placed on the four-turned end of the wooden board 1 (FIG. 8 a) in which the decorative sheet 3 is attached to at least the front surface (lower surface in the figure) of the substrate 2. After the formation (b), the edging surfaces 8 and 8 are formed on the surface side of the reals 5 and 6. The edging surface 8 is preferably formed by using the inclined rolls 20a, 20b, and 20c as a pre-process of the pressing process for processing the curved surface of the groove (FIGS. 9 to 11). The inclined rolls 20a, 20b, and 20c are all provided so as to be rotatable without being driven, and are pressed against the edge of the wooden board 1 to perform pressing while rotating as the wooden board is conveyed. These inclined rolls from the upstream in the conveying direction A of the wood board 1, the inclined rolls 20a (Fig. 9) which is inclined beta ₁ with respect to the vertical plane, inclined rolls 20b that is inclined beta ₂ with respect to the vertical plane (Fig. 10 ) And inclined rolls 20c (FIG. 11) inclined in the direction of β ₃ with respect to the vertical plane, and these inclination angles β ₁ , β ₂ , β ₃ are 45 ° <β ₁ <β ₂ <β ₃ <90. Meet the relationship. As in the case of pressing by the pressing rolls 11a, 11a: 11b, 11b: 11c, and 11c with respect to the opening edge of the groove 4, the edge surface can be smoothly formed as the pressing process is performed in multiple stages. On the other hand, since processing by a multi-step process becomes complicated, in this embodiment, three types of pressing rolls 20a, 20b, and 20c having different inclination angles are arranged in the conveying direction of the wooden board 1 so that the inclination angle gradually increases. Three-stage pressing is performed.

As shown in FIG. 12, the edge surface 8 thus formed is formed of an inclined plane 9a and an outwardly convex curved surface 9b. The curved surface 9b is formed so as not to protrude from the virtual extension surface of the inclined plane 9a. Since the rotating shafts of the inclined rolls 20a, 20b, and 20c are all perpendicular to the pressing direction, the edge surface 8 can be formed with high accuracy without the inclined roll escaping during pressing.

It is front sectional drawing which shows the processing apparatus for enforcing the groove | channel formation method of the wooden board by this invention with a wooden board. It is a fragmentary sectional view by the AA cutting line of the processing apparatus of FIG. It is a cross-sectional view of the wood board processed with this processing apparatus. It is sectional drawing which shows the press process by the 1st press roll for carrying out convex curve processing of the groove opening edge of a wooden board. It is sectional drawing which shows the press process by the 2nd press roll for processing the convex opening of the groove opening edge of a wooden board. It is sectional drawing which shows the press process by the 3rd press roll for carrying out convex curve processing of the groove opening edge of a wooden board. It is sectional drawing which shows the state by which the opening edge of V-groove was formed in the convex curve shape by the press process of FIG. 4 thru | or FIG. It is sectional drawing which shows the manufacturing process of a wooden board. It is sectional drawing which shows the press process by the 1st inclination roll for forming an edging surface in the real surface side of a wooden board. It is sectional drawing which shows the press process by the 2nd inclination roll for forming an edging surface in the real surface side of a wooden board. It is sectional drawing which shows the press process by the 3rd inclination roll for forming an edging surface in the real surface side of a wooden board. It is sectional drawing which shows the state in which the edging surface was formed in the edge of a wooden board by the process of FIG. 9 thru | or FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wood board 4 V-groove 7 Convex-curved surface 8 formed in V-groove opening edge Edge surface 10 Processing apparatus 11 (11a, 11b, 11c) Press roll 12 (12a, 12b, 12c) Press surface 15 Support roll 16 Chain conveyor 17 Reference surface 19 (19a, 19b) Holding roll 20 (20a, 20b, 20c) Inclined roll

Claims (1)

In a method for forming an outwardly convex curved surface on the opening side of the groove by pressing the opening edge of the groove after forming the groove on the surface of the wood board, a processing apparatus having a reference surface is used as the reference surface. Is placed facing upward, transported with the surface of the wood board facing down against this reference plane, and a pressing roll that presses the opening edge of the groove formed on the surface of the wood board during this transportation A curved groove forming method for a wooden board, characterized in that an outwardly convex curved surface is formed on the opening edge of the groove by pressing upwardly.

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