JPH06182659A - Grinding method for cutting edge - Google Patents

Abstract

PURPOSE:To provide the grinding method of cutting edges capable of improving the grinding precision, maintaining good assembling precision, improving the cutting precision, and reducing the grinding time and grinding labor. CONSTITUTION:Multiple circular cutting edges 16 are fastened to a common shaft 20 by a fastening device 18, and both ends of the shaft 20 are supported on the shaft drive section 12 and the shaft center press section 14 of a grinding device. The circular cutting edges 16 are ground in sequence or concurrently by the cup type grinding wheel 22A of a grinding machine 22 controlled with the shift quantities in the vertical direction and the horizontal direction by an NC control mechanism. The circular cutting edges 16 can be ground in the lump only in the grounding process without requiring the flow of multiple processes such as the removing process removing the circular cutting edges 16 from the shaft 20, the grinding process individually grinding the removed circular cutting edges 16, and the assembling process again assembling them to the shaft 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of polishing a cutting blade, and more particularly to a photographic light-sensitive material, a magnetic recording material, a pressure-sensitive recording paper,
The present invention relates to a cutting blade polishing method for polishing a cutting blade of a cutting machine that cuts a wide web such as a thermal recording paper into a small width.

[0002]

2. Description of the Related Art A cutting machine for cutting a wide web such as a photographic light-sensitive material, a magnetic recording material, a pressure-sensitive recording paper and a heat-sensitive recording paper into a small width is shown in FIG. The lower blade 2 is generally composed of a plurality of circular cutting blades 2 which are fastened and fixed to the shaft 3 at predetermined intervals. If the cutting blade continues cutting for a long time, the cutting ability is deteriorated due to abrasion or the like, and thus it requires periodic polishing. In the conventional method of polishing a cutting blade, when polishing the lower circular cutting blade 2, first, the circular cutting blade 2 removed from the shaft 3 is fixed to the polishing shaft 6 for polishing as shown in FIG. The outer peripheral surface of the circular cutting blade 2 is subjected to buffing, rough polishing, and final polishing by the grinding wheel 4 one by one while rotating the polishing shaft 6. Next, as shown in FIG. 13, an oil grindstone 5 is applied to the outer peripheral edge 2A and the ventral side edge 2B of the circular cutting blade 2 to polish and blade the blades, and finally, after the dimensions and the blade edge are inspected, again. By assembling the shaft 3 and adjusting the tightened state, the assembling accuracy is obtained.

However, when the precision of assembling the circular cutting blade 2 after polishing to the shaft 3 of the cutting machine is poor, when the wide web is cut into a small width, the blade tip swings in the axial direction of the shaft 3 to cause a thrust runout. Or radial runout that swings in the direction of rotation occurs. Especially when thrust runout occurs,
As shown in FIG. 14, there are problems that the width of the cut web 7 varies and the web 7 meanders and cuts.

From such a background, in particular, as a measure for eliminating thrust runout during cutting and improving thrust accuracy, JP-B-60-1930 and JP-B-60-1931.
As disclosed in the official gazette and Japanese Utility Model Application Laid-Open No. 64-52686, an improvement of a fastening device for accurately fastening when a circular cutting blade 2 after polishing is assembled and fastened to a shaft 3 is achieved. It has been.

[0005]

However, the conventional method of polishing a cutting blade is as follows. The plurality of circular cutting blades 2 are detached from the shaft 3, individually polished one by one, and reassembled on the shaft 3. Besides the drawback that the accuracy becomes worse,
There is a problem that the polishing accuracy of the individual circular cutting blades 2 tends to vary. That is, in precision polishing, variations in the product temperature of the individual circular cutting blades 2 and subtle contraction or expansion of the circular cutting blades 2 due to the working environment at the time of polishing affect the polishing accuracy. In the conventional polishing method in which the polishing is performed separately and the individual polishing is performed, factors that deteriorate polishing accuracy are likely to increase.

Further, there is a drawback that the time required for removing, polishing and assembling the circular cutting blade 2 becomes long, and a great deal of labor is required for removing and assembling the circular cutting blade 2 from the shaft 3. is there. Further, although the fastening device for fixing the circular cutting blade 2 to the shaft 3 has been improved, there is a problem that highly accurate assembly is required for the operator to perform accurate assembly every time polishing is performed.

The present invention has been made in view of the above circumstances. Since it is possible to improve the polishing accuracy and maintain a good assembling accuracy, it is possible to improve the cutting accuracy and reduce the polishing labor and the polishing time. It is an object of the present invention to propose a cutting blade polishing method that can reduce the number of cutting blades.

[0008]

In order to achieve the above-mentioned object, the present invention fastens a plurality of circular cutting blades to a common shaft by a fastening device and, in this state, sequentially or simultaneously by the grinding means the plurality of circular cutting blades. It is characterized by polishing a circular cutting blade of a sheet.

[0009]

According to the present invention, the circular cutting blades are sequentially or simultaneously polished by the polishing means in a state where the circular cutting blades are fastened to the common shaft by the fastening device. Like the polishing method, the removal step of removing the circular cutting blade from the shaft, the polishing step of individually polishing the removed circular cutting blades, the assembly step of reassembling the polished circular cutting blade to the shaft It is possible to carry out batch polishing only in the polishing step without requiring a flow of steps. As a result, variations in the product temperature of the individual circular cutting blades that affect the polishing accuracy, and subtle contraction or expansion of the circular cutting blade due to the working environment during polishing are less likely to occur, so that the polishing accuracy can be improved. Furthermore, it is not necessary to remove or assemble the circular cutting blade from the shaft each time polishing is performed, and once assembled accurately, the assembly precision does not vary with each polishing. Assembling accuracy can be maintained. Therefore, since the polishing accuracy and the assembling accuracy are improved, it is possible to improve the cutting accuracy when the wide web is cut into a small width.

Further, since it is not necessary to remove and assemble the circular cutting blade, the working time can be shortened and
Work effort can be reduced. The method for polishing a cutting blade according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows a polishing apparatus used in the method for polishing a cutting blade according to the present invention. As shown in FIG. 1, the shaft drive unit 12 is provided on one side of the horizontal base 10 and the shaft center pushing unit 14 is provided on the other side of the base 10. Then, a plurality of circular cutting blades 16 to be ground are fitted and both ends of the shaft 20 fastened by the fastening device 18 are formed by the shaft drive portion 12 and the shaft center pushing portion 14. It is supported so as to have a center line of rotation indicated by XX. Further, the shaft drive unit 12 has a built-in rotary drive source, and the drive shaft 12A is rotated by this rotary drive source to rotate the shaft 20 at a predetermined rotational speed. The shaft center pushing portion 14 mainly includes a center 14A protruding toward the shaft driving portion 12 and a shaft bearing 14B provided at the tip of the center 14A and pivotally supporting one end of the shaft 20.

Further, a grindstone machine 22 is provided above the shaft 20 supported by the shaft drive section 12 and the shaft center pushing section 14. The grindstone machine 22 mainly has a rotary drive source incorporated therein. 22B, a grindstone shaft 22C that rotates at a predetermined rotation speed by a rotary drive source, and a cup-shaped grindstone wheel 22A attached to the tip of the grindstone shaft 22C.
It consists of Further, the grindstone machine 22 is intermittently moved by an NC control mechanism (not shown) in the vertical direction and the horizontal direction by a set movement amount as shown in FIGS. In particular, with respect to the amount of movement in the horizontal direction that greatly affects the polishing accuracy, the amount of movement is detected by a magnet scale and fed back to the NC control mechanism. Further, the NC control mechanism, as shown in FIG. 3, makes the angle α of the grindstone machine 22 so that the cup-shaped grindstone wheel 22A and the ventral side cutting edge 16A of the circular cutting blade 16 are in contact with each other at a predetermined angle. To control. Further, in the circumferential portion on the polishing surface side of the cup type grinding wheel 22A, C
A BN grindstone (a grindstone in which cubic boron nitride abrasive grains are bonded with a binder) 22D is fixed, and the CBN grindstone 22D is brought into contact with the abdominal edge 16A of the circular cutting blade 16 for polishing. There is.

Next, a method of polishing the cutting blade of the present invention, that is, a method of polishing the circular cutting blade 16 while being assembled to the shaft 20 by using the polishing apparatus configured as described above will be described. First, the shaft 20 is removed from a cutting machine (not shown) while the circular cutting blade 16 is fastened, and one end of the shaft 20 is attached to the shaft driving portion so that the belly edge 16A of the circular cutting blade 16 faces the shaft center pushing portion 14 side. 12 and the other end of the shaft center pushing portion 1
4 bearings 14B. And the shaft drive unit 1
The rotary cutting source 2 is operated to rotate the circular cutting blade 16 at a predetermined rotation speed. Next, the whetstone drive source of the whetstone machine 22 is operated to rotate the cup-shaped whetstone 22A at a predetermined rotation speed. After that, the grindstone machine 22 is controlled by the NC control mechanism, and the circular cutting blade 16 is sequentially polished by performing the following operation. That is, the grindstone machine 22 moves downward by a predetermined movement amount by the movement of FIG. 2, and C of the cup-shaped grindstone wheel 22A is provided between the circular cutting blades 12 that are fastened at predetermined intervals.
BN grindstone 22D enters. Next, the grinder 22 is shown in FIG.
Is moved by a predetermined movement amount in the axial direction of the shaft 20, and as shown in FIG. 3, C of the cup type grinding wheel 22A is moved.
The BN grindstone 22D is brought into contact with the abdominal edge 16A of the circular cutting blade 16 to polish the abdominal edge 16A for a predetermined time. When the grinding is completed, the grindstone device moves by and of FIG.
It moves in the axial direction of the shaft 20 by a predetermined amount of movement away from the abdominal cutting edge 16A, and then moves upward to retract the cup type grinding wheel 22A from between the circular cutting blades 16 comrades. In synchronism with the withdrawal of the cup type grinding wheel 22A from between the circular cutting blades 16 as shown in FIG. 4, the oil grindstone 24 is brought into flat contact with the outer peripheral cutting edge 16B of the circular cutting blade 16 as shown in FIG. The blade is attached. As a result, the polishing of the single circular cutting blade 16 is completed, and similarly, the grindstone machine 22
The next circular cutting blade 16 is polished by performing the movements shown in FIG.

As described above, according to the method for polishing a cutting blade of the present invention, the NC control mechanism causes the grindstone machine 22 to move in a predetermined path with the plurality of circular cutting blades 16 assembled to the shaft 20. Circular cutting blade 1 by moving by the amount
Since 6 can be sequentially polished, the circular cutting blade 16 is removed from the shaft 20, and the removed circular cutting blades 16 are individually polished and attached to the shaft 20 again, as in the conventional cutting blade polishing method. It is possible to perform collective polishing that does not require the flow of a plurality of steps. As a result, variations in the product temperature of the individual circular cutting blades 16 that affect the polishing accuracy, and subtle contraction or expansion of the circular cutting blade 16 due to the working environment during polishing are less likely to occur, so that the polishing accuracy can be improved. it can. Furthermore, it is not necessary to remove the circular cutting blade 16 from the shaft 20 or assemble it on the shaft 20 each time polishing is performed. Therefore, good assembly accuracy can be maintained. Therefore, since the polishing accuracy is improved and the good assembling accuracy is maintained, it is possible to improve the cutting accuracy when the wide web is cut into a small width.

Further, since it is not necessary to remove and assemble the circular cutting blade 16, the working time can be shortened and the working labor can be reduced.

[0015]

EXAMPLE Next, the polishing accuracy, the assembling accuracy (the thrust accuracy is measured), and the cutting accuracy when the circular cutting blade 16 is polished by the above-described method for polishing a cutting blade of the present invention, are removed from the shaft 20 and polished. The result of comparison with the conventional polishing method will be described below. FIG. 5 shows the polishing accuracy measured by a stylus type roughness meter when the circular cutting blade 16 was polished by the method for polishing a cutting blade of the present invention, and (A) shows the outer peripheral cutting edge 16B of the polished circular cutting blade 16. 3B is a measurement diagram of the shape of the ventral side cutting edge 16A of the circular cutting blade 16 and FIG. 6C is a measurement diagram of the roughness of the polished surface of the ventral side cutting edge 16A. Further, FIG. 6 is a measurement diagram corresponding to FIG. 5 of the circular cutting blade 16 polished by the conventional polishing method. As is clear from the comparison between FIG. 5 and FIG. 6, the results show that the outer peripheral cutting edge 16B and the ventral side cutting edge 16A are polished into sharp shapes in the polishing method of the present invention. Sagging occurs on the abdominal edge 16A. Further, in the polishing method of the present invention, the roughness of the polished surface of the abdominal cutting edge 16A is within the range of 0.6 μm at maximum, whereas in the conventional polishing method, variation occurs within the range of 6 μm at maximum.

FIG. 7 shows that after polishing by the method for polishing a cutting blade of the present invention, the shaft 20 is attached to a cutting machine and rotated at a predetermined number of revolutions, whereby the thrust accuracy of the circular cutting blade 16 (fluctuation in the axial direction of the shaft 20). ) Is a measurement diagram of measurement. Further, FIG. 8 is a measurement diagram in which the circular cutting blade 16 is ground by a conventional grinding method, the circular cutting blade 16 is mounted on the shaft 20 again, the shaft 20 is mounted on the cutting machine, and the thrust accuracy is similarly measured. As is clear from the comparison between FIG. 7 and FIG. 8, the result shows that the thrust accuracy in the polishing method of the present invention is 2 μm at maximum.
m is in the range of 10 μm by the conventional polishing method.
The variation occurred within the range.

FIG. 9 shows the cutting accuracy when a wide web is actually cut into a small width after the shaft 20 is attached to a cutting machine after being ground by the method for grinding a cutting blade according to the present invention. (Width accuracy) is a measurement diagram measured by a laser continuous width measuring machine. In addition, FIG. 10 is a measurement diagram in which the cutting precision is similarly measured after polishing by the conventional polishing method, the circular cutting blade 16 is attached to the shaft 20 again, and the shaft 20 is attached to the cutting machine. This result is shown in FIG. 9 and FIG.
As is clear from the comparison of the above, the cutting accuracy in the polishing method of the present invention is within the range of 5 μm at the maximum in the variation of the web width accuracy, whereas it is 12 μm at the maximum in the conventional polishing method.
Variation.

As is clear from the above comparison results, the cutting blade polishing method of the present invention has improved polishing accuracy as compared with the conventional polishing method and maintains good assembly accuracy once assembled. Therefore, the cutting accuracy can be improved. Therefore, when the web to be cut is a motion picture film, it is possible to improve so as to reduce the horizontal deflection of the projection screen.

In this embodiment, the lower blade of the upper blade and the lower blade (circular cutting blade) constituting the cutting machine has been described. However, the method of polishing the cutting blade of the present invention is not limited to the upper blade. Can also be applied. Further, in this embodiment, one cup-type grinding wheel is attached to the grindstone machine so that a plurality of circular cutting blades are sequentially polished, but a plurality of cup-type grinding wheel wheels are provided on the grindstone shaft of the grindstone machine at the same time. It is also possible to be able to polish the circular cutting blade. Further, in this embodiment, the movement of the grindstone machine is controlled by the NC control mechanism, but it may be manually fed by a feed handle or the like.

[0020]

As described above, according to the method of polishing a cutting blade according to the present invention, the circular cutting blade is polished by the polishing means successively or simultaneously while the circular cutting blade is fastened to the fastening device. As a result, the polishing accuracy is improved, and the good assembling accuracy once assembled is maintained, so that the cutting accuracy can be improved. Further, since it is not necessary to remove the circular cutting blade from the shaft and assemble it to the shaft, the working time can be shortened and the working labor can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram in which a shaft having a plurality of circular cutting blades fastened thereto is supported by a polishing apparatus used in the method for polishing a cutting blade of the present invention.

FIG. 2 is an explanatory view for explaining a movement trajectory of a grindstone machine in the cutting blade polishing method of the present invention.

FIG. 3 is a partial cross-sectional view showing a state of polishing by the method for polishing a cutting blade of the present invention.

FIG. 4 is a partial cross-sectional view showing blade attachment by the method for polishing a cutting blade of the present invention.

FIG. 5 is a measurement diagram in which the polishing accuracy of the cutting blade polishing method of the present invention is measured.

FIG. 6 is a measurement diagram in which the polishing accuracy of a conventional cutting blade polishing method is measured.

FIG. 7 is a measurement diagram in which the thrust accuracy of the cutting blade polishing method of the present invention is measured.

FIG. 8 is a measurement diagram in which the smoothing and accuracy of the conventional cutting blade polishing method are measured.

FIG. 9 is a measurement diagram in which the cutting accuracy of the cutting blade polishing method of the present invention is measured.

FIG. 10 is a measurement diagram in which the cutting accuracy of a conventional cutting blade polishing method is measured.

FIG. 11 is a partial cross-sectional view showing the configuration of the upper blade and the lower blade of the cutting machine.

FIG. 12 is a partial sectional view showing an outline of polishing by a conventional cutting blade polishing method.

FIG. 13 is a partial cross-sectional view showing blade attachment by a conventional cutting blade polishing method.

FIG. 14 is a state diagram showing a cut state of a web when thrust accuracy is poor.

[Explanation of symbols]

 12 ... Shaft drive part 14 ... Shaft center pushing part 16 ... Circular cutting blade 18 ... Fastening device 20 ... Shaft 22 ... Grinding machine 22A ... Cup type grinding wheel

Claims (3)

[Claims] 1. A cutting blade characterized in that a plurality of circular cutting blades are fastened to a common shaft by a fastening device, and in this state, the plurality of circular cutting blades are sequentially or simultaneously polished by a polishing means. Polishing method. 2. The method of polishing a cutting blade according to claim 1, wherein the polishing means is sequentially polished while repeating intermittent movement in the horizontal direction and the vertical direction. 3. The method of polishing a cutting blade according to claim 1, wherein the NC controller controls the intermittent movement of the polishing means in the horizontal and vertical directions.