JPH07112396A - Method and device for cutting resin-covered product having metallic core - Google Patents

Abstract

PURPOSE:To prevent the deformation of a metallic core situated in the vicinity of a cut part when cutting a resin-covered product having the metallic core by a press type. CONSTITUTION:In a method wherein a cutting scheduled part is sheared by a cutting blade 41 in a state that a part in the vicinity of a cutting scheduled part 57 of a resin-covered product having a core 56 made of a metal is gripped by a hold mold, a protrusion 21 approximately in the shape of a wedge in cross section protruded in an opposite direction to a shearing direction by the cutting blade 41 is formed on the gripping surfaces 19 of the hold mold to grip the vicinal part. Shearing is effected with the vicinal part supported by the protrusion 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a cutting device for cutting a resin-coated product (hereinafter also simply referred to as a resin-coated product) having a metal core material by a press method.

[0002]

2. Description of the Related Art Conventionally, a metal core material 61 as shown in FIG.
As a method of cutting the resin-coated product 65 in which the resin 63 is coated with the resin 63, a portion of the resin-coated product 65 close to the planned cutting portion 67 is sandwiched by a holding mold (also referred to as a die or a stripper) 69 that is divided into two parts. There is a press type method in which the planned cutting portion 67 is sheared by the cutting blade 71. This press-type cutting method has less noise during cutting compared to the cutting method using a circular saw, and has the advantage of working environment that cutting chips and resin component gas are hardly generated, and the cutting blade has a cutting edge compared to a circular saw blade. It has excellent wear resistance and long cutting blade replacement intervals, which is advantageous in terms of maintenance and economy.

However, in the press-type cutting method, a resin-coated product obtained by coating a metal core material 61 with a soft resin, for example, a core material such as stainless steel has a hardness of JIS.
When a molding covered with a soft vinyl chloride resin of about A80 ° is cut, as shown in FIG. 4, the metal core material 61 is deformed in the shearing direction near the cutting part 67a of the resin-coated product 65, and the deformed part After that, it is necessary to cut or scrape off with a file. The deformation of the metal core material occurs when the resin (lower resin in the figure) 65a on the side opposite to the cutting blade 71 cannot withstand the pressing of the metal core material 61 by the cutting blade 71 and is compressed and deformed. Guessed.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention has been made in view of the above points, and prevents deformation in the vicinity of a cut portion when a resin-coated product having a metal core material is cut by a press type. An object of the present invention is to provide a cutting method and a cutting device that can be used.

[0005]

The invention of a cutting method is to shear a portion to be cut with a cutting blade while holding a portion of a resin-coated product having a metal core material in the vicinity of the portion to be cut with a holding die. In the method, the holding surface of the holding die that holds the adjacent portion is provided with a protrusion having a substantially wedge-shaped cross section that protrudes in a direction opposite to the shearing direction of the cutting blade, and shears while supporting the adjacent portion by the protrusion. It is characterized by

On the other hand, the invention of a cutting device is a cutting device having a holding die for sandwiching a portion of a resin-coated product having a metal core material in the vicinity of a planned cutting portion, and a cutting blade for shearing the planned cutting portion. The holding-type holding surface for holding the adjacent portion is provided with a protrusion having a substantially wedge-shaped cross section that projects in a direction opposite to the shearing direction of the cutting blade.

[0007]

In the resin-coated product held by the holding die, when the resin is soft, the resin is pushed by the tip of the protrusion and dents inward, and the tip of the protrusion approaches the metal core material. As a result, the metal core material is supported by the tip of the protrusion with almost no resin interposed, and shearing is performed in that state, so that the deformation of the metal core material is prevented. The resin pressed by the tip of the protrusion and recessed is restored by the elasticity of the resin thereafter, so that no deformation remains.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a front view showing an embodiment of the cutting device of the present invention, and FIG. 2 is a 2-2 cutting end view thereof showing a state immediately before cutting.

The cutting device 10 shown in FIGS. 1 and 2 is for cutting the molding 50 shown in the drawing.
It comprises a pressing means 31 and a cutting blade 41. In the molding 50 to be cut, the resin 53 on the design surface 51 side is formed of a soft resin such as soft vinyl chloride resin, and the resin 55 on the non-design surface 54 side such as legs is formed of a resin such as ABS resin which is harder than that. The metal core material 56 made of stainless steel is covered with these resins 53 and 55, and extends in the direction perpendicular to the paper surface.

The holding die 11 is a portion to be cut 5 of the molding 50.
It is composed of a lower mold 12 and an upper mold 24, which sandwich portions 58 and 59 close to 7 together. The lower mold 12 supports the molding 50 from the lower side, and in this embodiment, the molding 50 is combined with and separated from the lower mold body 13 so that the molding 50 can be easily arranged and extracted. Slide type 18
And consists of. In the lower mold body 13 and the slide mold 18,
Clamping surface 1 for clamping the molding 50 with the upper mold 24
4, 19 are formed. In addition, 15 is a slide type 1
8 is a cylinder device for sliding 8.

Cutting blade insertion openings 16 and 20 are formed at predetermined depths on the holding surfaces 14 and 19 of the lower die body 13 and the slide die 18, and the holding surface 19 of the slide die 18 has protrusions. 21 is formed. Cutting blade insertion opening 1
Reference numerals 6 and 20 allow the cutting blade 41 to be inserted when the molding is cut, and are provided so that one hole is formed by combining the lower mold body 13 and the slide mold 18. A planned cutting portion 57 is located in the cutting blade insertion openings 16 and 20 when the molding 50 is cut.

The projection 21 is formed on the edge of the one side 20a of the cutting blade insertion opening 20 in the slide type holding surface 19 so as to project toward the upper die 24 in the direction opposite to the shearing direction. The shape of the projection 21 is a substantially wedge-shaped cross section with a thin tip, and the height thereof is approximately equal to or slightly smaller than the thickness of the resin 53 on the molding design surface 51 side that abuts the projection 21. It is preferably small. The protrusion 21 of this embodiment has a height of 0.6 mm, a base width (thickness) of 1.0 mm, and a tip width (thickness) of 0.3 mm.

The projection 21 is preferably provided at a position closest to the planned cutting portion 57, and may be provided not only on one side 20a of the cutting blade insertion opening 20 but also on the other side 20b. Further, in this embodiment, the projection 21 is provided only on the slide-type sandwiching surface 19 that supports the soft resin 53 on the design surface 51 side, but the projection may be provided on the sandwiching surface 14 of the lower mold body. .

The upper die 24 is connected to the lower die 12 by a molding 50.
The lower surface is a holding surface 25 having a shape along the surface of the molding 50, and the lower cutting blade insertion opening 1 is formed.
Cutting blade insertion openings 26 corresponding to Nos. 6 and 20 are formed so as to penetrate from the upper surface to the lower holding surface 25. The upper mold 24 of this embodiment is provided with a pressing means 31 described later.
Moves up and down, which allows the mall to be pinched and pulled out.

The pressing means 31 is urged upward by guide shafts 32, 32 erected on the upper surface of the upper mold 24 and springs 34, 34 fitted on the outer circumferences of the guide shafts 32, 32. The pressing plate 36 is attached to the guide shafts 32, 32 through the through holes 35, 35 so as to be vertically movable, and a cylinder device 37 that is located above the pressing plate 36 and moves the pressing plate 36 up and down. . 33, 33 are guide shafts 32, 32
The pressing plate 36 is prevented from being disengaged from the guide shafts 32, 32 by a nut screwed to the end portion of the.

The pressing means 31 is a cylinder device 37.
When the pressing plate 36 descends due to the operation of, the springs 34, 34 are compressed between the pressing plate 36 and the upper mold 24, and the repulsive elasticity of the springs 34, 34 causes the upper mold 2 to move.
4 is pushed toward the lower mold, so that the molding 50 can be held between the lower mold 12 and the molding 50. On the other hand, when the pressing plate 36 rises due to the operation of the cylinder device 37, the pressing plate 36 first hits the nuts 33, 33 at the upper ends of the guide shafts 32, 32, and then together with the guide shafts 32, 32, the upper mold 24.
Lift up. As a result, a gap is formed between the molding 50 and the upper mold holding surface 25, which facilitates the placement and extraction of the molding 50.

The cutting blade 41 has a width capable of cutting the molding 50, is aligned with the cutting blade insertion openings 16, 20, 26 of the lower die 12 and the upper die 24, and the cutting blade 4
The upper end is attached to the lower surface of the pressing plate 36 so that the sharpened blade edge 42 of 1 is on the protrusion 21 side.

Next, the cutting method of the present invention will be described in the case of using the above apparatus. First, the pressing plate 36
With the upper mold clamping surface 25 and the lower mold clamping surface 14,
The molding 50 is inserted between the upper die holding surface 25 and the lower die holding surfaces 14 and 19 with a large gap between the die 19 and the slide die 18 separated from the lower die body 13. Then, the slide mold 18 is moved to the lower mold body 1 by the operation of the cylinder device 15.
3, and the molding 50 is supported by the holding surface 19 of the slide mold and the holding surface 14 of the lower mold body. At this time, the portion to be cut 57 of the molding is connected to the cutting blade insertion openings 16, 20,
Position it at 26.

Then, the pressing plate 36 is lowered together with the cutting blade 41 by the operation of the cylinder device 37 of the pressing means. As a result, the upper die 24 is pushed down by the springs 34, 34 and descends, and the upper die clamping surface 25 and the lower die clamping surface 1
Portions 58 and 59 that are close to the planned cutting portion 57 of the molding are sandwiched between 4 and 19. At this time, the tip of the lower mold protrusion 21 comes into contact with the portion of the molding closest to the planned cutting portion 57.

When the pressing plate 36 is further lowered together with the cutting blade 41, the upper and lower clamping surfaces 25, 14,
The molding 50 is further strongly sandwiched between 19 and the cutting blade 41 starts to cut the planned cutting portion 57 of the molding in that state. At this time, since the resin 55 on the non-designed surface 54 side of the molding is made of a hard resin, the metal core material 56 is less likely to be deformed on the non-designed surface 54 side. On the side of the design surface 51, as shown in FIG. 2, the soft resin 53 is pressed by the tip of the protrusion 21 to be depressed, and the metal core material 56 is almost entirely resin 53.
There is no risk of deformation because it is supported by the tip of the protrusion 21 without going through.

After that, the upper die 24 and the cutting blade 41 are raised by the operation of the cylinder device 37 of the pressing means, and
When the slide die 18 is separated from the lower die body 13 by the operation of the cylinder device 15 and the molding after cutting is taken out from the holding die 11, a molding having a desired size without deformation of the metal core material 56 near the cutting portion is obtained. To be

In addition, the sandwiching of the portion close to the planned cutting portion 57 is always performed on both sides 5 of the planned cutting portion 57 as in this embodiment.
It is not necessary to carry out with 8, 59, and it may be sandwiched by only one side 58. The pressing means 31 is not limited to the one shown in the figure, and a known one may be used.

Further, in the above-mentioned embodiment, the cutting of the molding having a complicated cross section was shown, but the method and apparatus of the present invention is not limited to the cutting of the molding having the above-mentioned shape, and the cross section is substantially trapezoidal or It is also applied to the cutting of a molding having a simple shape such as a rectangle, or the cutting of resin-coated products other than the molding. Furthermore, it is also applicable to cutting a resin-coated product in which the entire circumference of a metal core material is covered with a soft resin or a hard resin. In those cases, the lower mold of the holding mold may be formed of one without the slide mold.

[0024]

As shown and described above, according to the method and apparatus of the present invention, the resin-coated product can be cut by preventing the deformation of the metal core material, and a cut product having a beautiful cut surface can be obtained. To be Further, compared to cutting with a circular saw, there are advantages such as low noise, small amount of dust and the like, and high abrasion resistance of the cutting blade.

[Brief description of drawings]

FIG. 1 is a front view of a cutting device according to an embodiment of the present invention.

FIG. 2 is a 2-2 cut end view showing a state immediately before cutting.

FIG. 3 is a cut end view showing a part of a conventional device.

FIG. 4 is a cross-sectional view of a resin-coated product cut by a conventional technique.

[Explanation of symbols]

 11 Holding Type 12 Lower Type 13 Lower Type Main Body 14 Lower Type Main Body Clamping Surface 18 Sliding Type 19 Sliding Type Clamping Surface 21 Protrusion 24 Upper Mold 25 Upper Die Clamping Surface 41 Cutting Blade 50 Resin Coated Product 57 Planned Cutting Section 53 Soft Resin 56 Metal core material

Claims (2)

[Claims] 1. A method of shearing the planned cutting part with a cutting blade while sandwiching the part close to the planned cutting part of a resin-coated product having a metal core material with a holding die, and holding the adjacent part. A metal core material characterized in that a protrusion having a substantially wedge-shaped cross section is provided on the clamping surface of the mold so as to project in a direction opposite to the shearing direction by the cutting blade, and the protrusion is sheared while supporting the adjacent portion. A method for cutting a resin-coated product having the same. 2. A cutting device having a holding die for holding a portion of a resin-coated product having a metal core material in the vicinity of a planned cutting portion, and a cutting blade for shearing the planned cutting portion, wherein the adjacent portion is clamped. A cutting device having a wedge-shaped cross-section protruding in a direction opposite to the shearing direction of the cutting blade is provided on the holding surface of the holding die.