JPH0450138B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) This invention is applicable to tobacco leaf cutting blades used for continuous cutting of compressed tobacco leaves, and other blades used for cutting various thin materials such as paper and vinyl sheets. The present invention relates to a manufacturing method.

(Prior Art) Before explaining the manufacturing method of this type of conventional cutlery using a straight blade of a tobacco leaf cutting blade as an example,
First, the structure and usage of this straight blade will be explained as follows.

Figures 2a and 2b show a finished product of the straight blade 1 for cutting tobacco leaves, with a cutting angle of 18° (θ ) is formed.

FIG. 3 schematically shows how the straight blade 1 for cutting tobacco leaves is used, and in the figure, 4 is a compressor of a tobacco press for compressing dried tobacco leaves;
Compressed tobacco leaves A are continuously extruded from here.
Reference numeral 5 denotes a cutting drum rotatably installed near the outside of the Comaro 4, and a straight blade 1 having a width slightly wider than the extrusion width of the Comaro 4 is installed on the circumference of the cutting drum 5 in the circumferential direction. Reference numerals 6, which are held at appropriate intervals and capable of moving in and out in the directions indicated by arrows A and B in FIG. A pair of disc-shaped grindstones 8, 8 are attached to the rotary shaft 7 so as to be movable relative to each other along the direction of the rotation axis, so that when cutting the compressed tobacco leaf A, the grindstones protrude and move in the direction of arrow A. The pair of disk-shaped grindstones 8, 8 polish the blade edge 3 of the straight blade 1 while moving relatively near and far in the direction of the rotation axis, thereby maintaining the sharpness of the straight blade 1.

A conventional manufacturing method of the straight blade 1 for cutting tobacco leaves having the above-mentioned structure and usage mode is as shown in the flowchart of FIG. 4.

That is, carbon tool steel (JIS standard SK1 to SK5), alloy tool steel (JIS standard SKS1, 2, 3, 5, 7, 8,),
A cutting process 10 in which a steel plate such as high-speed tool steel (JIS standard SKH9) or tungsten-carbon cemented carbide is cold-cut into a predetermined size and shape; Deburring process 11 to remove burrs, strain relief process 12 using shaping rolls, quenching in a temperature range of 860℃±20℃, and immersing in oil at 18℃~20℃ to about 300℃ A quenching process 13 for lowering the temperature, a pressing process 14 for removing thermal distortion, a tempering process 15 for tempering (press tempering) in a temperature range of 180°C to 200°C for about 1 hour, a water washing process 16, a thermal distortion straightening process 17, A rough polishing process 18 to remove black scale (oxide film) on the surface of the steel pipe plate, a final polishing process 19 to adjust the thickness and dimensions, a distortion correction process 20 to correct distortions caused by polishing, and a polishing process to determine the width. 21. After going through a total of 18 processes including vertical dimension, straightening process 22, final distortion correction process 23, demagnetizing process 24, blade attaching process 25, engraving process 26, and oil wiping and packaging process 27, the straight blade 1 is made. It was being manufactured.

(Problems to be Solved by the Invention) The conventional manufacturing method described above not only requires an extremely large number of steps, but also requires specialized techniques and skills, especially for deburring, straightening distortion, polishing, demagnetizing, etc. This, together with the fact that there is a limit to the improvement of productivity, has the disadvantage that the overall manufacturing cost and ultimately the product cost are extremely high.

This invention was made in view of the above-mentioned circumstances, and provides a method for manufacturing cutlery that can significantly reduce manufacturing costs by significantly reducing the number of steps without any deterioration in cutting performance or durability. It has a purpose in that it does something.

(Means for Solving the Problems) A method for manufacturing cutlery according to the present invention, which was developed to achieve the above object, has a size that allows cutting out a plurality of cutleres, and reduces tension. A process of cutting the sheet steel plate into a predetermined size and shape using a carbon dioxide laser using a sheet steel plate that has been continuously quenched, tempered, and polished in a non-oxidizing atmosphere in the applied state; The method is characterized by comprising a step of polishing the cut steel plate of a predetermined cutter type unit, and a step of attaching a blade.

According to the method of this invention, the material is a sheet steel plate having a size that is an integral multiple of the final product, and the sheet steel material is tension-quenched in a non-oxidizing atmosphere to absorb thermal expansion by relaxing the tension. The steel sheet can be adjusted to a desired structure with almost no thermal distortion, and can be made into a material steel sheet with no distortion and excellent surface brightness by tempering and polishing following quenching, and has a predetermined size and shape. By performing cutting with a reducing carbon dioxide laser, it is possible to completely prevent or minimize the occurrence of burrs, structural changes, and even purple-based tempering colors. By omitting the conventionally indispensable processes such as several times of strain correction, polishing, and demagnetization, it is possible to significantly reduce the total number of manufacturing processes.

(Example) Hereinafter, a case where an example of the present invention is applied to a straight blade for cutting tobacco leaves will be described in detail based on the drawings.

The structure of the manufactured finished product of the target straight blade 1 for cutting tobacco leaves is as already explained based on FIGS. Since it is as explained above, it will be omitted here, and only the manufacturing method will be explained based on the flow shown in FIG.

In Fig. 1, 1' is a sheet-like material steel plate, which has almost the same width W as the finished product straight blade 1, and 5 of the vertical dimension (length: N) of the finished product straight blade 1.
It has ~6 times the length, and this corresponds to the coefficient of thermal expansion of the starting material (surface roughness: 12S), such as the carbon tool steel or alloy tool steel mentioned above. Nitrogen gas (N ₂ ) under tension
By passing the 860
It is quenched in oil in a temperature range of ±20°C, then tempered (press tempering) in a temperature range of 180°C to 200°C, and then polished to give the surface shine.

The production of the sheet-like material steel plate 1', which includes the above-mentioned quenching, tempering, and polishing steps, is generally carried out continuously on a line separate from the production line for the straight blade 1. In other words, it is generally manufactured by a steel processing company that supplies the material to a knife manufacturer.
Of course, a cutlery manufacturer may also install a production line for the sheet-like raw steel plate 1' as described above.

Therefore, the structure change of the sheet steel sheet 1' produced through the above process is as follows: Cementite precipitates in pearlite matrix (at room temperature) → Austenite → Martensite/Pearlite/Cementite (oil quenching) → Soruvite/Pearlite - Cementite is partially precipitated (tempered) in a martensitic matrix, and the Shore hardness of the sheet-like material steel plate 1' after production is 80 to 95.

The method for manufacturing the straight blade 1 for cutting tobacco leaves using the sheet-like steel plate 1' as described above is as follows.

That is, using a carbon dioxide (CO ₂ ) laser, the steel plate 1' is cut to a predetermined length (1/5N to 1/6N).
A cutting step 30 for cutting the cut steel sheet, a polishing step 31 for finishing both longitudinal edges of the cut steel sheet, a blade attaching step 32 (referring to a normal blade polishing step or a blade edge polishing step), an engraving step 33, and oil wiping and packaging. Step 34 is the fifth step.

In addition, by using carbon dioxide (CO ₂ ) laser cutting in the cutting step 30 of the above manufacturing process, the cutting width can be narrowed and the cutting speed can be increased, so that the purple color can be reduced at locations other than the cut surfaces. The development of tempering color based on It has the effect of improving performance and durability.

The invention so far has been explained with reference to the straight blade 1 for cutting tobacco leaves, but the cutlery to be manufactured is a spiral blade 1A for cutting tobacco leaves having a shape as shown in FIG. It goes without saying that the invention may also be applied to the production of cutlery used for cutting and shearing various thin materials such as paper cutting and vinyl film cutting.

Additionally, CO-laser cutters with not only two-dimensional but also three-dimensional cutting capabilities can be used.

(Effects of the Invention) As can be understood from the above explanation, according to the present invention, a tension-quenched, tempered, and polished sheet steel plate is used as a raw material, and this is cut not by mechanical cutting but by a carbon dioxide gas laser. By cutting it into a predetermined size and shape, it is possible to remove burrs, straighten distortion, polish, and demagnetize, which are indispensable for conventional mechanical cutting and require specialized skills and skills. It is possible to significantly reduce the total number of manufacturing processes by omitting each process that was previously used, and
Predetermined cutting performance and durability can be ensured without causing tissue changes.

Therefore, compared to conventional methods, this method has the effect of significantly reducing the manufacturing cost of cutlery having the same or better performance.

[Brief explanation of drawings]

FIG. 1 is a float chart showing a manufacturing method of a straight blade for cutting tobacco leaves according to an embodiment of the present invention, FIGS. 2a and b are front and side views of the finished product, and FIG.
The figure is a schematic perspective view of the main parts showing how it is used for cutting tobacco leaves, FIG. 4 is a flowchart of a conventional method, and FIG. 5 is a perspective view of another blade to be manufactured. (Explanation of symbols), 1 is a straight blade for cutting tobacco leaves, 1
30 is a cutting process, 31 is a polishing process, 32 is a cutting process, and 33 is a stamping process.

Claims (1)

[Claims] 1. A sheet steel plate having a size that allows cutting out a plurality of cutlery items, and which is continuously quenched, tempered, and polished in a non-oxidizing atmosphere under tension. A process for making cutlery, which consists of a process of cutting out this sheet steel plate as a material into a predetermined size and shape using a carbon dioxide laser, a process of polishing the cut steel plate in a predetermined unit of cutlery, and a process of attaching a blade. Production method. 2. The method for manufacturing cutlery according to claim 1, wherein the cutter to be manufactured is a cutting blade for compressed tobacco leaves.