JPH02106214A - Disk type cutting tool - Google Patents

Abstract

PURPOSE:To improve the performance of a knife and prolong the life of the knife in a disk type knife for cutting a cut material such as metal plate along the delivering direction by forming the edge part functioning as a cutting edge by a material having a higher hardness than that of the material of a knife body. CONSTITUTION:A ceramic part 2 sintered in a ring is fitted in the outer circumferential part of a disk type knife body 1 and adhered thereto by adhesives. A protruded part 2C provided on the inner circumferential face of the ring ceramic 2 is engaged with a recessed part 1a provided on the outer circumferential wall of the knife body 1 to strengthen the engagement with the ceramic part 2. As the materials of ceramics, those of zirconium type are preferred as cutting tools because of its high strength and toughness and excellent wear resistance and cutting ability. Thus, the performance as knife is improved, and also the life of the knife can be largely prolonged.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a tool for cutting a metal plate, and in particular, when a roll-shaped thin metal plate is fed out and moved, the thin plate is cut into multiple strips along the direction of movement. This invention relates to the structure of a disc-shaped cutting tool installed on a slitter line for cutting.

[Conventional technology]

In the slitter line, a coiled metal plate, such as a steel plate, is fed out, and the steel plate is cut into multiple strips of a predetermined width using multiple disc-shaped cutting tools inserted through a shaft positioned perpendicular to the feeding direction. Do the work you want to do.

FIGS. 7 and 8 show the configuration of the cutting tool section in the slitter line.

Reference numerals 50 to 55 in the figure are disc-shaped cutting tools called slinter knives (hereinafter referred to as "disk-shaped knives" or simply "
knives"), of which knives 50, 51 and 52 are attached to the upper shaft 56, and knives 53, 54 and 5 are attached to the upper shaft 56.
The knives 5 are inserted through the lower shaft 57, respectively. These knives are arranged at predetermined intervals in the axial direction of each shaft by spacers 58, 59, 60, 61 inserted through the upper shaft 56 and the lower shaft 57. The circumferential edges are positioned adjacent to each other to provide an appropriate clearance for the thickness of the plate to be cut. That is, the knives 50, 53, 51, 54, 52, and 55 are arranged in pairs so that the edges of the knives in each pair are located close to each other. Among the pair of circumferential edges of each of the knives in each set, the edge on the side that is located close to the edge of the other knife in the set, for example, the edge 8 of knives 50 and 53 is fjll &. The edge portion 50a of the knife 50 and the edge portion 53a of the knife 53 adjacent to this edge serve as cutting portions that directly cut the object to be cut, thus forming a so-called knife.

In this way, by arranging the knives at appropriate intervals, the cutting knives that are rotated by the shafts 56 and 57 and located close to each other cut the steel plate 62 in the feeding direction (X direction in FIG. 8). ), a predetermined width W1,
Cut into multiple strips using W2, WN, etc.

[Problem to be solved by the invention]

In the above configuration, a large stress is applied to the back of the component of the disc-shaped knife that forms the center of the cutting device, and to the edge portion where the cutting is directly performed, and wear occurs and progresses as the cutting operation progresses. If this part wears out, the cut surface will become rough and the cutting efficiency of the slitter line will decrease, so conventionally the knife has been made of durable materials such as cemented carbide containing tungsten carbide. Highly abrasive materials are used. However, even with the use of such cemented carbide, the wear resistance of the knife is not necessarily sufficient.
However, since cemented carbide is expensive, the product price of the knife is quite high.

In addition to this, if the edge of the knife, which is the life of the knife, wears out or even a small part breaks, the entire knife must be replaced, which is coupled with the high price of the knife. This makes the entire device extremely uneconomical.

[Means to solve the problem]

The present invention has been constructed in view of the above-mentioned problems, and focuses on the fact that the central part that influences the performance of a disc-shaped knife is the edge of the knife circumferential part that constitutes the knife engine, and has developed a material for forming this part. Constructed separately from the material constituting the knife body. More specifically, the cutting tool is characterized in that the part of the blade that directly cuts is made of a material such as ceramics that is more effective in cutting metal.

[Effect]

A metal plate to be cut is cut into a plurality of strips in the 8/:J direction by the end edge of each disk-shaped knife made of a harder material such as ceramics.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIGS. 1A and 1B show a first embodiment.

In the figure, reference numeral 1 indicates the main body of the disc-shaped knife, and 2 is a ceramic portion formed in an annular shape on the outer peripheral side edge of the main body 1. As shown in FIG. The circumferential edges 2a and 2b of the ceramic portion 20 are configured as a so-called knife, and serve as blades for cutting the target metal plate.

Various types of ceramics can be used, but the inventors conducted processing tests and performance tests using various ceramics, taking into account workability when forming a product, wear resistance as a product, price, etc. As a result of tests such as (cutting ability, wear resistance, etc.), it was confirmed that ceramics made of alumina or zirconia exhibit high performance.

In particular, it has been found that ceramics made from zirconia have higher strength and toughness than ceramics made from alumina, and are suitable as the constituent material of the present invention.

The characteristics of each ceramic are shown in the table below. Note that this table is based on the material property test results of INAX Co., Ltd.

Further, A to D in the material section indicate the following ceramics.

A: 92% alumina containing ceramic part 6% alumina containing ceramic nox C: 99.5%
Alumina-containing ceramic D: Zirconia ceramic Further, properties 1 to 7 each exhibit the following properties.

1. Water absorption rate (%) 2. Bulk density (g/cTIN) Bending strength (MPa) Micro Vickers hardness (load 1 kgf) Young's modulus (G
Pa) Thermal expansion coefficient (room temperature to 400°C1XIO-6/Thermal conductivity (25° (, W/m-K) It has well-balanced advantages in terms of properties, etc., and has high mechanical performance such as wear resistance.In contrast to these alumina-based ceramics, zirconia-based ceramics are more durable than alumina-based ceramics as mentioned above. It has high strength and toughness, and is a suitable material for a cutlery material such as the one of the present invention.The following explanation will be based on zirconia ceramics unless otherwise specified.

In the configuration of the disk-shaped knife shown in FIG.
The ceramic part 2 and the outer peripheral part of the main body 1 are connected by an adhesive. In this case, a convex portion 2C is formed on the inner circumferential wall of the annular ceramic, and a recess 1a is formed on the outer circumferential wall of the knife body at a position corresponding to the convex portion 2C.
By forming these convex portions 2C and engaging the concave portions 1a, the engagement of the ceramic portion 2 can be made stronger. With this configuration, the edge portion that becomes the blade of the disk-shaped knife is made of ceramics. Further, since the knife body 1 itself functions as a portion that holds the ceramic portion 2 and does not have the function of directly cutting the object, it is not necessary to be made of cemented carbide as in the conventional structure. In the figure, reference numeral 1b is an insertion hole through which the shaft is inserted, and lc is a key groove through which the shaft inserted through the insertion hole and the knife main body 1 are keyed together.

Further, in the above description, the ceramic portion is formed in an annular shape, but it is of course possible to divide this ring into a plurality of parts in the circumferential direction and to configure each of them to be attached to the knife body 1. However, although this configuration of attaching the divided ceramic parts makes it easier to attach the ceramic parts, there is a risk that the cutting ability of the knife will be reduced if the divided parts are joined incorrectly. , special care must be taken to fit each split member correctly.

In addition, very good adhesives are currently available, and the inventors attached the ceramic part using the product name Hard Rock [11 manufactured by Denka] and conducted a cutting test.
There were no problems with the work and it was satisfactory.

FIG. 2 shows a second embodiment.

In this embodiment, the annular ceramic portion 2 is attached using detachable connection means such as bolts.

That is, in the figure, 3 is a bolt, which is arranged so that its head 3a is buried in one or more recesses 2d formed in the outer peripheral wall of the annular ceramic part 2, and is screwed into the knife body 1 side. It has become.

Note that it is desirable to attach a plurality of bolts 3 in the circumferential direction of the ceramic portion 2. This is not just a matter of strength when attaching the ceramic part, but also a matter of balance when rotating the knife. In other words, if only one bolt is used, the uniformity of the weight in the circumferential direction of the knife will be distorted in some parts of the bolt, which may cause undesirable situations such as vibrations when the knife rotates. It's for a reason. Therefore, multiple bolts should be used, and when using an even number of bolts, it is desirable that the imaginary line connecting the opposing bolts pass through the center of the knife, and an odd number of bolts should be used. When using bolts, it is desirable that the angles formed between each bolt and the center of the knife are equal; for example, when using three bolts, it is desirable that the angles formed between each bolt and the center of the knife are all 120°. .

Ceramics has high hardness, so it has high wear resistance and sharpness as a knife, but on the other hand, it can break if localized bending stress is applied, so if it is attached with a removable means such as a bolt, By replacing only the ceramic part, the entire knife can be used as a new knife. Furthermore, when cutting with zirconia-based ceramics, it is expected that the lifespan will be several times longer than that of cemented carbide, but even so, the ceramic parts will still wear out over long periods of use. Therefore, even if the knife is due for replacement in the case where the blade part is due to be replaced, it is possible to use the knife as a new knife by replacing only the ceramic part, in the same way as if the knife had cracked. becomes. As shown in the figure, the head of the bolt 3 is configured to be buried in the recess 2d, but if this recess is covered with a material such as hard rubber and the head of the bolt 3 is buried, the object to be cut will be removed. Injuries can be more thoroughly prevented. Also code 4
is an elastic intermediate member such as hard rubber or a spring seal, which disperses the tightening force of the bolt 3 and prevents the ceramic part 2 from cracking or breaking due to concentration of stress when tightening the bolt. .

FIG. 3 shows a third embodiment.

In this embodiment, a recess 4a is formed in the inner peripheral wall of the ceramic part (indicated by reference numeral 4) in the circumferential direction to increase the contact area with the knife body, thereby improving the mounting strength of the ceramic part. It is. In the case of this configuration, if the entire ceramic part 4 is formed integrally, it will not be possible to attach it to the knife body, so the whole is formed at least in half and each part is attached to the knife body. .

FIG. 4 shows a fourth embodiment.

In this configuration, step portions 1d and 1e are formed in the circumferential direction of the edge of the knife body 1, respectively, and annular ceramic portions 5a and 5b are respectively fitted into the annular step portions. With this configuration, it is possible to limit the amount of ceramic parts used to only the necessary parts. In addition, since the contact area with the knife body can be made larger compared to the total volume of the ceramic portion, the connection strength can also be maintained at a high level. In addition, the third
Both of the fourth embodiment and the fourth embodiment assume that the ceramic part is attached using an adhesive, but FIG. 6 shows a configuration in which the ceramic part is attached using bolts in the fourth embodiment. In the figure, the bolt 7 passes through the side wall of the ceramic portion 5a, extends in the thickness direction of the knife body, and is threadedly engaged with the knife body 1. In this case as well, the head 7a of the bolt 7 is buried in the ceramic portion, similar to the configuration shown in FIG. If the thickness of the knife body 1 is not sufficient to allow the bolt 7 to be inserted and screwed into the knife body, the bolt can be inserted and screwed into the knife body in the radial direction as shown in the configuration shown in FIG.

FIG. 5 shows a fifth embodiment.

In this configuration, the total volume of the ceramic portion is made smaller than that of the fourth embodiment. That is, as is clear from the figure, the edge portion of the knife body l is shaved off in the circumferential direction to form a slope If, 1g, and this slope 1f.
, an annular ceramic portion 6a with a triangular cross section for 1g;
Attach and fix 6b.

The ninth article shows another configuration of the method for attaching the ceramic part.

In (A), a stepped portion 11.1j having an inverted cross section is formed in the direction of the edge of the circumferential portion of the knife body 1, and ceramic portions 7a and 7b having an inverted cross section are formed in relation to this stepped portion. The installed configuration is shown.

In (B), contrary to the configuration of (A) above, step portions 1k and 12 having a cross-sectional shape of a cross-section are formed in the direction of the edge of the circumference of the knife body 1, and the step portions are shaped like a cross-section. ceramic part 8a,
8b is installed.

(C) is a configuration that combines the configurations of (A) and (B) above, and shows a configuration in which ceramic parts 9a, 9b having a U-shaped cross section are attached to the stepped portions 1m, 1n.

(D) is a modification in which the configuration (C) is connected, in which ceramic sections 10a and 10b having a cross-section E or a Y-shape are attached to the stepped portion 10.1p.

(E) is a simplified configuration of (D).

With the configurations shown in (A) to (E) above, the contact area between the ceramic part and the knife body can be increased, so
The mounting strength of the ceramic portion can be improved.

In the embodiment shown above, both of the pair of circumferential edges of the knife body are formed of ceramics, but at least the edge of the adjacent knife among the pair of edges is made of ceramic. The purpose can be achieved by making only the edge portion on the side that functions as a blade that engages with the blade and cuts the object to be cut as a ceramic portion. That is, taking the configuration shown in FIG. 4 as an example, the purpose can be achieved if only one of the ceramic parts 5a and 5b is configured to be attached to the knife body.

〔effect〕

As described in detail in the embodiments above, the present invention provides a disk-shaped knife in which, of a pair of circumferential edge portions that cut an object, at least one edge portion that functions as a blade constitutes a knife body. The knife is characterized by being made of a material that is harder than the material used to make the knife, so it can improve the performance of the knife compared to knives with metal blades, and has improved wear resistance. This makes it possible to significantly extend the lifespan of the

[Brief explanation of drawings]

FIG. 1(A) is a partial radial cross-sectional view of a disc-shaped cutting tool showing the first embodiment of the present invention, FIG. 1(B) is a plan view of the knife shown in FIG. 2(A), and FIG. FIG. 3 is a partial radial cross-sectional view of a disk-shaped cutting tool showing a third embodiment; FIG. 4 is a partial radial cross-sectional view of a disk-shaped cutting tool showing a fourth embodiment. Fig. 5 is a partial radial cross-sectional view of a disc-shaped cutting tool showing the fifth embodiment; Fig. 6 is a partial radial cross-sectional view of the cutting tool in the fourth embodiment; FIG. 7 is a partial radial cross-sectional view of a disc-shaped cutting tool showing a modified example of FIG. FIG. 9 is a partial radial cross-sectional view of a disc-shaped cutting tool showing another example of forming the ceramic portion. 1... Disc-shaped knife body 1d, 1e... Knife body circumferential step portion ir, 1f.
...Knife body circumferential slope 2.5a, 5b, 6a, 6
b... Ceramic part 3.6... Bolt 56.57... Disc-shaped knife insertion shaft 62...
Object to be cut

Claims (5)

[Claims] (1) A plurality of disc-shaped knives are placed adjacent to each other, and the object to be cut, such as a metal plate, is moved in the feeding direction of the object by the engagement of the circumferential edges of each of the adjacent knives. In the case of cutting along the circumferential direction of the disc-shaped knife, at least the edge that functions as a blade among the pair of circumferential edges of the disc-shaped knife,
A disc-shaped cutting tool characterized in that it is made of a material harder than the material constituting the knife body. (2) The disc-shaped cutting tool according to claim (1), wherein the material forming the edge functioning as the blade is ceramic containing zirconia as a main component. (3) Claim (2) characterized in that the ceramic part is attached to the knife body by a removable means such as a bolt, and the ceramic part is configured to be able to be attached to and detached from the knife body as appropriate. Disc type cutting tool as described. (4) A patent claim characterized in that a stepped portion is formed on at least one circumferential edge of the knife body, and a ceramic portion is fitted and fixed to the stepped portion to form a blade. A disc-shaped cutting tool according to item (2). (5) The groove forming portion is formed as a slope whose circumferential edge is shaved off instead of a groove, and a ceramic portion having a triangular cross section is attached and fixed to this slope. The disc-shaped cutting tool according to item (2).