JP2019135481A - Multi-blade cutter for crosscut test - Google Patents

Abstract

PROBLEM TO BE SOLVED: To safely form a notch for a coating film adhesion test with a high precision interval and a depth under stable conditions by a simple operation, and to easily replace a blade. Further, the present invention provides a cross-cut test multi-blade cutter capable of simultaneously forming a plurality of cuts for a cross-cut test even on a coating film provided on a curved substrate. SOLUTION: The blade is provided with a plurality of blades having engagement holes, a fulcrum shaft for axially mounting the blades in parallel in the blade thickness direction, a blade holder for accommodating the blades, and a constant angle of the blade holders. A holder cover is provided, a fin-shaped spacer is provided on at least one of the blade holder and the holder cover, and a magnet that is in sliding contact with the holder cover is provided between the blade holder and the coating film to be tested. A multi-blade cutter for cross-cut testing, characterized by a roller that urges the test coating. [Selection diagram] Fig. 1

Description

  The present invention relates to a multi-blade cutter for cross-cut test that forms a grid-like cut in a coating film in order to evaluate adhesion resistance of the coating film provided on a substrate.

  As a method for evaluating the adhesion of a coating provided on a substrate, there are various test methods represented by JIS “K-5400” and the like. According to the method of JIS “K-5400”, a cut is formed in the coating film on the test piece until it penetrates the sharp blade and reaches the substrate (substrate). And the brittleness of a coating film and the quality of the adhesiveness to a base material are determined from the magnitude | size of the spreading of the damage | wound in the cut of a coating film. In addition, if necessary, a cellophane tape peeling test is performed on the scratches on the coating film formed as described above by the method specified in JIS “Z-1552”, and the quality of adhesion is quantified. .

  The conventional cross-cut method uses a cutter knife and a cross-cut guide to form a number of scratches on the coating film to be tested according to the test method, and then cross-cuts so that the scratches become a grid pattern. In general, the guide is rotated by 90 ° and then a predetermined number of cuts are formed along the guide again. (For example, refer to Patent Document 1).

  In the crosscut method using such a crosscut guide, it is necessary to frequently replace the blade. The reason is that since the gap of the crosscut guide is very narrow, the cutting edge of the cutter knife contacts the metal crosscut guide frequently, and the cutting edge is easily damaged. In addition, there may be a case where an incision error occurs such as making an incision twice or more in the same place, or a notch is not formed in a part, and the work while paying attention to such an error is extremely complicated and can be improved. It was sought after.

  In response to the above-described problem, a coating cutting tool that can simultaneously form a plurality of cuts with a plurality of cutter blades arranged at predetermined intervals in the blade thickness direction has been proposed (for example, Patent Documents 2 to 4). ). When forming a cut simultaneously using such a plurality of blades, it is very difficult to make a cut while keeping the biasing force of each blade against the coating. In particular, in the case of a coating film having a film thickness of less than 20 μm, it was difficult to perform accurate evaluation due to insufficient or excessive cutting depth.

  As a method for cutting the thin film, the inventor uses the force that the magnet provided on the back side of the coating film to be tested attracts the blade in the direction of the blade edge to urge the tip of the blade toward the cut portion. A method of cutting the coating film by moving either the blade or the coating film to be tested has been proposed (Patent Document 5). However, when the thickness of the coating film to be tested is several millimeters or more, or when the shape of the coating film to be tested is a solid or spherical surface, it is difficult to cut.

  As a method of forming a stable cut even when the shape of the coating film to be tested is a three-dimensional object or a spherical surface, the present inventor has a plurality of blades having engagement holes, and the blades are parallel to the blade thickness direction. A fulcrum shaft that is pivotally attached; a blade holder that houses the blade pivotally attached to the fulcrum shaft; a magnet is disposed between a blade edge of the blade and a coating film to be tested; Has been proposed (Patent Document 6).

Japanese Utility Model Publication No. 2-333157 JP-A-8-843 JP-A-8-215444 JP-A-9-101254 JP 2012-18142 A International Publication No. 2017/007034

  With the cross-cutting device exemplified in Patent Document 6, it is possible to form a cut with an error that the accuracy of the blade interval does not exceed 0.2 mm while keeping the cut depth stable. However, there has been room for further improvement in order to make the blade interval less than 0.1 mm. There is also room for improvement in the difference in magnetic force applied to each blade. The present invention has been made to solve these problems.

The above-described problems of the present invention have been solved by the following invention.
(1) Provided with a plurality of blades having engagement holes, a fulcrum shaft for pivotally mounting the blade in parallel with the blade thickness direction, a blade holder for storing the blade, and a constant angle of the blade holder A holder cover for holding, a fin-like spacer on at least one of the blade holder and the holder cover, and at least one magnet in sliding contact with the holder cover provided between the blade holder and the coating film to be tested A multi-blade cutter for cross-cut testing, comprising at least a pair of front and rear rollers for urging the coating film to be tested.
(2) It is preferable that the roller disposed so as to surround the cutting edge of the blade is a magnet roller, and all the inward magnetic poles of the magnet roller are the same.

  The multi-blade cutter for cross-cut test according to the present invention is capable of safely forming notches for coating adhesion test with high precision spacing and depth under stable conditions with simple operation, and blade A multi-blade cutter for cross-cut testing that is easy to replace and that can simultaneously form multiple cuts for coating adhesion testing even on coatings on curved substrates. provide.

FIG. 1 is a schematic perspective side view showing an example of a multi-blade cutter for crosscut testing according to the present invention. 2 is an exploded perspective side view of the multi-blade cutter for cross-cut test shown in FIG. FIG. 3 is a front perspective view of the cross-cut test multi-blade cutter shown in FIG. 4 is a rear perspective view of the cross-cut test multi-blade cutter shown in FIG. 5 is an exploded rear perspective view of the multi-blade cutter for cross-cut test shown in FIG. FIG. 6 is a front perspective view showing an example of a blade holder provided with fin-like spacers. FIG. 7 is a front perspective view showing an example of a holder cover provided with fin-like spacers. FIG. 8 is a bottom perspective view showing a state in which a blade cover is attached to the cross-cut test multi-blade cutter shown in FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an example of a schematic perspective side view showing a multi-blade cutter for crosscut testing according to the present invention, and FIGS. 2, 3, 4, and 5 are respectively an exploded perspective side view, a front perspective view, and a rear view of FIG. It is a perspective view and an exploded back perspective view. The multi-blade cutter for cross-cut test shown in FIGS. 1 to 5 has a plurality of blades 10, a fulcrum shaft 20, a blade holder 41, a holder cover 51, a blade biasing magnet 61, and rollers 70 and 72 as a basic configuration. Is provided. FIG. 6 is a front perspective view showing an example of a blade holder having fin-like spacers. FIG. 7 is a front perspective view showing an example of a holder cover provided with fin-like spacers. FIG. 8 is a bottom perspective view showing a state in which a blade cover is attached to the multi-blade cutter for cross-cut test shown in FIG.

  The blade 10 is a belt-like blade having an engagement hole 12 at the rear end portion, and is housed between the fin-like spacers 31 of the blade holder 41 so that the blade edge 14 faces downward. When forming a cut of 100 squares, 11 sheets are stored, and when forming a cut of 25 squares, 6 blades are stored according to the cut interval. Each engagement hole 12 is pivotally attached to the fulcrum shaft 20, and the fulcrum shaft 20 is engaged with the engagement hole 42 of the blade holder 41.

  The holder cover 51 includes two rollers 70 and 72, and is respectively attached to the rotation shafts 74 and 76. The blade biasing magnet 61 is fixed to the magnet cover 64 by a magnetic force or an adhesive, and is slidably contacted with the holder cover 51. The blade holder 41 is accommodated in the holder cover 51 so that the blade edge 14 of the blade 10 is accommodated between the fin-like spacers 32. A plate-like locking member 54 having an opening in the center is inserted into the rear end portion of the holder cover 51, the opening of the plate-like locking member 54 is aligned with the opening of the holder cover 51, and the pin 52 is inserted into the plate shape. By pushing the locking tool 54, the pin 52 is prevented from coming off, and the blade holder 40 is integrated with the holder cover 51.

  The blade 10 is preferably a soft magnetic material. Furthermore, the surface of the blade 10 is subjected to a surface treatment such as a metal vapor deposition film or a fluorine coat, and the static friction coefficient is preferably 0.2 or less, more preferably 0.1 or less.

  FIG. 6 is a front perspective view showing a state in which the fin-shaped spacer of the blade holder 41 faces upward. The blade 10 is mounted with the fulcrum shaft 20 inserted from the engagement hole 42 after being inserted with the blade 14 facing upward with the fin-shaped spacer facing upward. The blade holder 41 to which the blade 10 is attached is stored in the holder cover 51. At that time, first, the blade 10 is held in the blade holder 41 by attracting with a magnet from the direction opposite to the blade edge 14 of the blade 10, and then stored in the holder cover 51, so that the cutting edge 16 of the blade 10 becomes the blade holder. 41 can be safely stored without leaving.

  The multi-blade cutter for cross-cut testing of the present invention includes a fin-like spacer on at least one of a blade holder and a holder cover. When there is no spacer integrated on the side surface of the blade, it is more preferable to have fin-like spacers on both the blade holder and the holder cover. When using a blade having spacer protrusions or spacer plates on the side of the blade, it is preferable to use a blade holder that does not have a fin-like spacer and use a fin-like spacer only for the holder cover. The clearance between the blade and the fin-shaped spacer of the blade holder is preferably 0.08 mm to 0.16 mm. On the other hand, the clearance between the blade and the fin-shaped spacer of the holder cover is preferably 0.08 mm to 0.12 mm.

  The roller according to the present invention is preferably a roller made of a material having a low hardness with respect to the coating film to be tested, or a roller having a small surface roughness and not damaging the upper surface of the coating film to be tested. More preferably, it is a magnet roller. A preferred magnet roller is a neodymium magnet magnet roller. Further, a magnet roller with a resin coating is more preferable. Regarding the direction of the magnetic pole of each magnet roller, it is preferable that all four magnetic poles in the inward direction have the same pole with respect to the axial direction of the rotating shafts 74 and 76. Thus, by making all the inward magnetic poles of the rollers 70 and 72 the same, the error of the urging force between the blades is preferably reduced. Further, it is preferable that the magnetic pole on the side close to the blade 10 of the magnet 61 (upward magnetic pole) is the same magnetic pole as the inward magnetic poles of the rollers 70 and 72, so that the error of the attractive force with respect to each blade is reduced.

  FIG. 8 is a bottom perspective view showing a state in which a blade cover is attached to the cross-cut test multi-blade cutter shown in FIG. The magnet cover 64 can be fixed so as to be sandwiched by sliding the magnet cover 64 to the rear end, placing the blade cover thereon and pushing it in, and returning the magnet cover 64 forward.

  When exchanging the blade, the magnet 61 is slid to the rear end to push out the plate-shaped locking member 54, the pin 52 is pulled out, and then the blade cover 90 is placed on the blade edge. The blade holder 41 can be safely removed by pushing the blade cover 90 with the pin 10 sandwiched therebetween.

  A cross cut method using the multi blade cutter for cross cut of the present invention will be described. First, the blade cover 90 is removed. Next, the magnet cover 64 is slid, the cutting edge 16 of the blade 10 is pulled out from the blade holder 41, and it is confirmed that the cutting edges 16 are aligned. If they are not aligned, the blades 10 are pushed from the upper surface opening of the blade cover 41 to be adjusted. Next, the roller 72, the cutting edge 16, and the roller 70 are urged in this order on the coating film to be tested. With the rollers 70 and 72 and the cutting edge 16 being urged against the coating film to be tested, the holder cover is moved while keeping the angle constant, thereby simultaneously and stably forming 11 cuts in the coating film to be tested. can do. Next, the coating film to be tested is rotated by 90 °, and the same operation is performed so as to be orthogonal to the previously formed 11 cuts to form a cut of 100 squares. The urging force of the blade 10 on the coating film to be tested can be changed to an arbitrary strength by moving the position of the magnet 61. The holder cover 51 may include a memory 56, and when repeated evaluation is performed under the same conditions, the distance from the fulcrum shaft 20 can be made constant using the memory as a guide.

DESCRIPTION OF SYMBOLS 10 Blade 12 Engagement hole 14 Cutting edge 16 Cutting edge 20 Support shaft 31 Fin-shaped spacer 41 Blade holder 51 Holder cover 61 Magnet 70 72 Roller 90 Blade cover

Claims (2)

  A holder cover that includes a plurality of blades having engagement holes, a fulcrum shaft that pivotally mounts the blades parallel to the blade thickness direction, a blade holder that houses the blades, and maintains a constant angle of the blade holder A fin-like spacer on at least one of the blade holder and the holder cover, and at least one magnet that slides on the holder cover is provided between the blade holder and the coating film to be tested. A multi-blade cutter for cross-cut test, comprising at least a pair of front and rear rollers for urging the test coating film.   The multi-blade cutter for cross-cut testing according to claim 1, wherein the rollers arranged so as to surround the cutting edge of the blade are magnet rollers, and all the inward magnetic poles of the magnet roller are the same. .

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