TW202130432A - Metal saw - Google Patents

Abstract

The present invention relates to a metal saw for preventing a saw blade of a metal saw from being worn in the thickness direction. The metal saw having a saw blade on the outer circumferential portion comprises: a first plate-shaped object, a third plate-shaped object, and a second plate-shaped object placed between the first plate-shaped object and the third plate-shaped object. The saw blade includes: a plurality of cutting blade portions made up of the first plate-shaped object, the second plate-shaped object, and the third plate-shaped object; and a plurality of distribution portions made up of the second plate-shaped object in the rear side of the metal saw rotation direction of each of the plurality of distribution portions. Stiffness of the first plate-shaped object and the third plate-shaped object is higher than that of the second plate-shaped object. Toughness of the second plate-shaped object is higher than those of the first plate-shaped object and the third plate-shaped object. The first plate-shaped object and the third plate-shaped object have a support material. Constituent element of the first plate-shaped object and the ratio thereof are different from the constituent element of the second plate-shaped object and the ratio thereof.

Description

Metal saw

The present invention relates to a metal saw used when cutting ceramics and the like before sintering.

As one of semiconductor devices used in mobile phones and the like, there are multilayer ceramic capacitors. The multilayer ceramic capacitors are equipped with hundreds of them in a mobile phone, and they are mass-produced and consumed in large quantities every day.

Laminated ceramic capacitors are manufactured by laminating a plurality of plates of ceramic raw materials (ceramics before sintering), dividing this into individual chip capacitors through a cutting device, and then sintering them. In addition, if the division by a cutting device is performed after sintering, thermal deformation occurs due to the high temperature during sintering, the arrangement of chip capacitors is distorted, and precise cutting becomes difficult. Therefore, the division is performed before the sintering of the ceramic.

The process of dividing a plurality of plate-like laminates of ceramic raw materials into individual chip capacitors through a cutting device is implemented through a cutting device equipped with a metal saw. In Patent Document 1, a metal saw (rotary blade) has been disclosed, which is used for cutting ceramic materials and forms a saw blade on the outer periphery.

[Prior Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 4-179505

In addition, when the ceramic material is repeatedly cut and processed by the metal saw, the saw blade on the outer periphery of the metal saw is worn. In particular, the angles at both ends in the thickness direction of the cutting surface of the saw blade (the surface between one side surface and the other side surface of the metal saw) (the angle between the side surface of the metal saw and the cutting surface) have a large cutting load. , So the abrasion is strong, and the saw blade gradually changes to the shape where the corner is rounded.

When the corner portion of the saw blade of the metal saw is worn and the corner is rounded, the shape will be reflected in the processed portion at the cutting portion of the ceramic material to be cut. For this reason, the side surfaces of the individual chip capacitors manufactured by being divided also have a problem of becoming a shape reflecting the shape.

The present invention was created in view of this problem, and its object is to provide a metal saw that suppresses the wear of the corner portion of the saw blade. In addition, it is to provide a metal saw, even if it is used when the ceramic material is divided, the side surface of the formed chip capacitor will not become an abnormal shape.

According to one aspect of the present invention, there is provided a metal saw with a saw blade formed on the outer periphery, integrally provided with a first plate, a third plate, and between the first plate and the third plate. The second plate, the saw blade is equipped with There are: a plurality of cutting blades formed by a first plate, a second plate, and a third plate; each of the plurality of cutting blades is formed by the second side in the direction of rotation of the metal saw. Plural backs formed by plates.

According to another aspect of the present invention, there is provided a metal saw with a saw blade formed on the outer periphery, integrally having a first plate, a third plate, and one of the first plate and the third plate. The second plate in the middle, the saw blade system has: a plurality of cutting edge portions formed by the first plate, the second plate, and the third plate; in each of the plurality of cutting edge portions The back side of the metal saw in the rotation direction is composed of a plurality of backs formed by the first plate or the third plate.

In addition, according to another aspect of the present invention, there is provided a metal saw with a saw blade formed on the outer periphery and integrally having a first plate, a third plate, the first plate and the third plate. The second plate between objects, the saw blade system has: a plurality of cutting edge portions formed by the first plate, the second plate, and the third plate; in the plurality of cutting edge portions The back side of the respective metal saw in the rotation direction is formed by a plurality of backs formed by the second plate; the first plate and the third plate have higher rigidity than the second plate.

According to another aspect of the present invention, there is provided a metal saw with a saw blade formed on the outer periphery, integrally having a first plate, a third plate, and one of the first plate and the third plate. The second plate in the middle, the saw blade system has: a plurality of cutting edge portions formed by the first plate, the second plate, and the third plate; in each of the plurality of cutting edge portions The back side of the metal saw in the direction of rotation is formed by the first plate or the third plate; the first plate and the third plate are more rigid than the second plate The thing is high.

Furthermore, according to other aspects of the present invention, a The metal saw has a saw blade formed on the outer periphery, and the metal saw is integrally provided with a first plate, a third plate, and a second plate between the first plate and the third plate, The saw blade system has: a plurality of cutting blades formed by a first plate, a second plate, and a third plate; behind each of the plurality of cutting blades in the direction of rotation of the metal saw A plurality of backs formed by the second plate on the side; the first plate and the third plate are more rigid than the second plate, and the second plate is tougher than the second plate. The 1st plate and the 3rd plate are taller.

Furthermore, in accordance with another aspect of the present invention, a metal saw is provided, a saw blade is formed on the outer periphery, and the metal saw is integrally provided with a first plate, a third plate, and the first plate The second plate between the third plate and the third plate, the saw blade system has: a plurality of cutting blades formed by the first plate, the second plate, and the third plate; A plurality of backs formed by a first plate or a third plate on the rear side of the metal saw in the rotation direction of each of the plurality of cutting blade portions; the first plate and the third plate are rigid It is higher than the second plate-shaped object, and the second plate-shaped object has higher toughness than the first plate-shaped object and the third plate-shaped object.

In addition, in the metal saw related to one aspect of the present invention, the first plate and the third plate may have a concrete material. In addition, in the metal saw related to one aspect of the present invention, the constituent elements and ratios of the first plate can be made different from the constituent elements and ratios of the second plate.

According to one aspect of the present invention, the first to third plates are provided Can be used as a whole rotating metal saw. The metal saw related to one aspect of the present invention is formed by integrating three or more plates into one body, so individual properties can be independently set. For example, a plate with high rigidity and a plate with high toughness can be formed by stacking a plurality of plates in the thickness direction and combining them.

For example, when a plate with high rigidity is arranged on both sides, the wear resistance of the corners of the saw blade of a metal saw is improved. Then, when a plate with high toughness is placed between plates with high rigidity, the metal saw becomes stronger against external forces, impact, etc., and the durability of the metal saw is improved.

Furthermore, when cutting ceramics by arranging a plate with high rigidity on both sides that are easy to be exposed to friction and arranging a plate with low rigidity on the metal saw on the inside that is not easy to be exposed to friction, the cutting surface of the metal saw will change. Consume evenly. That is, the angle of the saw blade of the metal saw does not become a rounded shape due to abrasion. Therefore, the side surface of the formed chip capacitor does not become an abnormal shape.

In addition, in the metal saw related to an aspect of the present invention, the saw blade has a cutting edge portion and a back portion. The cutting edge part of cutting ceramics is made of the first to third plate-shaped objects, which can fully ensure the thickness of the part used for cutting. On the other hand, on the back of the part not used for cutting, there are the first plate and the third plate on the side without the saw blade, so it ensures a space that can effectively remove the cutting chips generated during cutting.

For this reason, it is possible to reduce abrasion during cutting of the corner portion of the cutting edge portion of the saw blade. In addition, it is easy to form such a shape with the cutting edge portion and the back portion by only adjusting the shape of each plate without performing complicated processing on the metal saw, so that the cost related to the manufacture of the metal saw is suppressed.

Therefore, according to one aspect of the present invention, the saw blade is provided with A metal saw whose corner wear is suppressed. In addition, we provide a metal saw that does not have an abnormal shape on the side surface of the chip capacitor formed when the ceramic material is divided and used.

2: Cutting device

4: main body

6: Display monitor

8: Exterior cover

10: Cutting unit

12: hold the stage

14: Mounting table

16: Spindle shell

18: Spindle

18a: opening

20: rear flange

22: Flange

22a: opening

22b: abutment surface

24: Convex

26: fixing bolt

26a: outer peripheral surface

28: metal saw

28a: opening

28b: saw blade

28c: Cutting edge

28d: back

30: Front flange

30a: opening

32: fixed nut

32a: opening

32b: inner wall surface

34: knife cover

36: Knife cover body

38: Slide cover

40: cylinder

42: Connecting tool

44: Nozzle

46: Connecting Tools

48: Connecting Tools

50a: 1st plate

50b: 2nd plate

50c: 3rd plate

52a: Opening of the first plate

52b: Opening of the second plate

52c: The opening of the third plate

[Fig. 1] A perspective view showing an example of a cutting device.

[Fig. 2] A perspective view schematically illustrating the configuration of a cutting unit.

[Fig. 3] Fig. 3(A) is a schematic diagram of the metal saw when viewed from the side, and Figs. 3(B) and 3(C) are diagrams schematically illustrating the cross-sectional structure of the metal saw.

[Fig. 4] Fig. 4(A) is a schematic diagram when viewed from the side of a metal saw related to another embodiment, and Figs. 4(B) and 4(C) are diagrams schematically illustrating the cross-sectional structure of the metal saw .

The embodiments related to the present invention will be described. As an example of the cutting device using the metal saw according to this embodiment, FIG. 1 shows an external perspective view of the cutting device 2 that cuts a workpiece such as ceramics. The cutting device 2 is composed of a main body 4, a display monitor 6 and the like. The main body 4 has the cutting unit 10 of the metal saw housed in an exterior cover 8, and the display monitor 6 is mounted on the outside of the main body 4. Install the cover 8.

A touch panel display monitor 6 is arranged on the front surface of the exterior cover 8. Through this display monitor 6, the operator inputs instructions for the device At the same time, the operating status of the device is displayed on the display monitor 6.

The cutting unit 10 is configured to be movable in the Y-axis direction. The holding table 12 is adjacent and the cutting unit 10 is arranged to be movable in the X-axis direction. The holding table 12 holds the object to be processed during processing. The mounting table 14 is a mounting table (elevator) on which a box capable of accommodating a plurality of to-be-processed objects can be placed inside, and is configured to be movable in the up-and-down direction.

When the box containing the workpiece is placed on the mounting table 14, the cutting device 2 unloads the workpiece from the box, and is placed on the holding table 12 through a predetermined transport mechanism. In addition, the holding table 12 applies negative pressure from a suction source (not shown) to suck and hold the workpiece on the holding table 12.

Here, a more detailed structure of the cutting unit 10 will be described using FIG. 2. FIG. 2 is an exploded view schematically illustrating the structure of the cutting unit 10. As shown in FIG. 2, the cutting unit 10 is, for example, a spindle housing 16 provided with a moving mechanism (not shown) fixed to the cutting device 2 and the like. Inside the main shaft housing 16, the main shaft 18 extending in the front-rear direction (Y-axis direction) is rotatably supported. The front end portion (front end portion) of the main shaft 18 protrudes forward from the main shaft housing 16.

An opening 18a is formed at the top end of the main shaft 18, and a screw valley is provided on the inner wall surface 18b of the opening 18a. At the top end of the main shaft 18, a rear flange 20 formed of a ferromagnetic material is attached. The rear flange 20 includes a flange portion 22 that extends radially outward, and a convex portion 24 that protrudes forward from the surface (front surface) of the flange portion 22.

In the center of the flange portion 22, an opening 22a that penetrates the flange portion 22 back and forth is formed. In addition, on the back (rear) side of the flange portion 22, a tie-shaped It is a fitting part (not shown) into which the tip part of the main shaft 18 can be fitted. This fitting part is provided at a position corresponding to the opening 22a.

When the fixing bolt 26 is locked into the opening 22 a and the opening 18 a in a state where the tip portion of the main shaft 18 is fitted into the fitting portion formed in the flange portion 22, the rear flange 20 is fixed to the main shaft 18. In addition, on the outer peripheral surface 26a of the fixing bolt 26, a screw peak corresponding to the screw valley of the opening 18a is provided.

The surface on the outer peripheral side of the flange portion 22 is a contact surface 22b that abuts on the side surface of the back side of the metal saw 28. This contact surface 22b is formed in an annular shape when viewed from the axial center direction (Y-axis direction) of the main shaft 18. The convex portion 24 is formed in a cylindrical shape, and a spiral peak is provided on the outer peripheral surface 24a.

In the center of the metal saw 28, a circular opening 28a is formed to penetrate the convex portion 24, and the convex portion 24 is inserted into the opening 28a, so that the metal saw 28 is installed on the rear flange 20.

With the metal saw 28 attached to the rear flange 20, an annular front flange 30 is fitted on the side surface of the front side of the metal saw 28. In the center of the front flange 30, an opening 30a is formed, and the convex portion 24 of the rear flange 20 is fitted into this opening 30a. In addition, the back surface on the outer peripheral side of the front flange 30 becomes a contact surface (not shown) that abuts against the side surface of the metal saw 28 on the front side. This abutting surface is provided at a position corresponding to the abutting surface 22 b of the rear flange 20.

After the front flange 30 is assembled, the annular fixing nut 32 is locked to the top end of the convex portion 24. Thereby, the front flange 30 is pressed to the rear flange 20 side, and the metal saw 28 is clamped by the rear flange 20 and the front flange 30. In addition, an opening 32a is formed in the fixing nut 32, and a screw valley is provided on the inner wall surface 32b of the opening 32a.

On the front surface of the spindle housing 16, a knife cover 34 that accommodates the metal saw 28 and the like attached to the spindle 18 is provided. The blade cover 34 is composed of a blade cover main body 36 fixed to the front surface of the spindle housing 16 and a slide cover 38 slidable in the left-right direction (X-axis direction) with respect to the blade cover main body 36.

The sliding cover 38 is connected to the blade cover main body 36 via the cylinder 40 so as to slide by the air supplied by the connecting tool 42. After the metal saw 28 is assembled on the main shaft 18, the sliding cover 38 is slid to close the knife cover 34, and the metal saw 28 can be housed inside the knife cover 34.

To the sliding cover 38, a pair of substantially L-shaped nozzles 44 sandwiching the lower part of the metal saw 28 back and forth are fixed. The nozzle 44 is supplied with cutting water through a connecting tool 46 provided on the slide cover 38. On the tip side of the nozzle 44, a plurality of slits (not shown) are formed so as to face the metal saw 28. The cutting water is supplied through the plurality of slits.

On the other hand, the blade cover main body 36 is provided with a supply hole (not shown) for supplying cutting water to the metal saw 28. This supply hole is connected to a connecting device 48 provided in the main body 36 of the blade cover, and the cutting water supplied from the supply hole through the connecting device 48 allows the metal saw 28 to be cooled and cleaned.

Next, the structure of the metal saw 28 will be described using FIGS. 3(A) to 3(C). Fig. 3(A) is a schematic diagram of the metal saw when viewed from the side, and Figs. 3(B) and 3(C) are diagrams schematically illustrating the cross-sectional structure of the metal saw in the thickness direction.

As shown in FIG. 3(A), in the center of the metal saw 28, a circular opening 28a inserted by the above-mentioned convex portion 24 is formed. On the outer periphery of the metal saw 28, a saw blade 28b is formed. When the main shaft 18 of the cutting unit 10 rotates, the metal saw 28 attached to the cutting unit 10 rotates in accordance with the rotation. Rotating metal When the tip of the saw 28 reaches the workpiece, the workpiece is cut through the saw blade 28b.

The saw blade 28b has a plurality of cutting blade portions (rake surfaces) 28c, and each of the plurality of cutting blade portions 28c has a plurality of back portions (flank surfaces) 28d on the rear side in the rotation direction of the metal saw 28. Each cutting edge portion 28c has a shape that protrudes in the outer circumferential direction of the metal saw 28 from the adjacent back portion 28d, and cuts the workpiece. Each back 28d has a shape that is cut in the direction of the center of the metal saw 28 rather than the adjacent cutting edge portion 28c, so as to ensure a space for effectively discharging chips generated by cutting.

FIG. 3(B) is a schematic diagram showing the cross-sectional structure of the metal saw 28 shown in FIG. 3(A) when cut through a plane perpendicular to the side surface through the dashed-dotted line AA′. Fig. 3(B) is a view of the saw blade 28b including the cutting blade portion 28c in particular. FIG. 3(C) is a schematic diagram showing the cross-sectional structure when the metal saw 28 shown in FIG. 3(A) is cut perpendicular to the side surface through the dotted line BB '. Fig. 3(C) is a view of the saw blade 28b including the back part 28d in particular.

As shown in Figures 3(B) and 3(C), the metal saw 28 has a first plate 50a, a third plate 50c, and is covered by the first plate 50a and the third plate 50c. The sandwiched second plate 50b. As shown in FIG. 3(B), the cutting blade portion 28c is formed by a first plate 50a, a second plate 50b, and a third plate 50c. On the other hand, as shown in FIG. 3(C), the back 28d is formed by the second plate 50b.

The method of forming the metal saw 28 will be described. First, metal powder is placed in a ring-shaped forming metal mold and cold-pressed to form a ring-shaped compact. Next, the formed ring-shaped compacts were layered in three layers, and burned To be integrated. The edge grinding process is performed on the outer peripheral part of the obtained sintered body, that is, the metal saw 28 is formed.

The saw blade 28b of the formed metal saw 28 has a cutting edge portion 28c formed by the first to third plates, and a back 28d formed by the second plate. The metal saw 28 has a complicated structure. . However, the metal saw 28 related to this embodiment can be formed by changing the shape of each plate-like object and then sintered. Therefore, the metal saw 28 does not require complicated processing to manufacture.

For example, when the shape of the metal saw 28 is to be formed from a single plate, in order to form the shape of the back 28d, it is necessary to cut out the individual back 28d, which takes time. On the other hand, to form the metal saw 28 according to this embodiment, such labor is not required. For this reason, it is possible to manufacture the metal saw 28 including the cutting blade portion 28c, the back portion 28d having a thickness different from the cutting blade portion 28c, and the saw blade 28b while suppressing costs.

In addition, during the production of the first to third plate-shaped objects, the physical properties of the individual plate-shaped objects can be adjusted by adjusting the constituent materials, composition, and the like of the metal powder as the individual raw materials. The physical properties of the metal saw 28 formed by sintering can be adjusted by adjusting the physical properties of the first to third plate-shaped objects.

For example, in the metal saw 28 related to this embodiment, the physical properties of the first to third plates are adjusted so that the rigidity of the first plate 50a and the rigidity of the third plate 50c can be made higher than that of the second plate. The rigidity of 50b is high.

Generally speaking, when repeated cutting with a metal saw, the corners at both ends in the thickness direction are worn away at the cutting edge of the saw blade, and the corners of the saw blade 28b on the outer periphery of the metal saw tend to be gradually rounded. .

Therefore, the metal saw 28 related to this embodiment is The constituent materials, compositions, etc. of the first to third plate-shaped objects are adjusted so that the rigidity of the first plate-shaped object 50a and the third plate-shaped object 50c is higher than the rigidity of the inner second plate-shaped object 50b. In this way, the two side surfaces of the metal saw 28 are formed into plates with high rigidity, so the wear resistance of the metal saw 28 will be improved. For this reason, the metal saw 28 is less likely to change in shape due to abrasion, and the shape of the side surface of the chip capacitor formed by the cutting of the metal saw 28 is also less likely to become an abnormal state.

In addition, in general, when the rigidity of a metal saw increases, the hardness increases on the one hand, and it tends to become brittle, and the possibility of damage due to impact or the like increases. For this reason, in order to realize a metal saw excellent in wear resistance, only increasing the hardness of the metal saw will cause a problem of impact resistance.

Therefore, in the metal saw 28 related to this embodiment, the second plate shape is adjusted to increase the toughness of the first plate 50a, the third plate 50c, and the second plate 50b sandwiched by it. The material, composition, etc. of the object. The high toughness plate improves the impact resistance and alleviates the shock from the outside.

If the toughness of the second plate 50b is higher than the toughness of the first and third plates, when shock is applied to the metal saw 28 from the outside, the second plate 50b will alleviate the shock. In this way, it is possible to prevent the first plate and the third plate having high rigidity from being damaged due to the impact. The second plate 50b has high toughness and low wear resistance, so it is easy to wear during repeated cutting with the metal saw 28. However, the second plate 50b is not at both ends where wear is particularly likely to occur, so it is resistant to a long period of time. usage of.

That is, the metal saw 28 according to this embodiment is equipped with a first plate 50a and a third plate 50c on the side that is easy to wear, so the saw The shape change caused by the abrasion of the side surface of the blade 28b is suppressed. On the other hand, since the second plate 50b with high toughness is provided on the inner side, even if impact is applied to the metal saw 28, the occurrence of damage or the like is suppressed. For this reason, the life of the metal saw 28 is extended.

The rigidity and toughness of the plate-shaped object are adjusted according to the constituent elements of the plate-shaped object and its ratio (content ratio). And, for example, the constituent elements of the first plate-shaped object and the content ratio thereof are different from the constituent elements and the ratio of the second plate-shaped object, and the individual rigidity and toughness are adjusted. Regarding the plates used for the metal saw 28, although for example, tungsten carbide (tungsten carbide) is used as a binder mixed with cobalt materials, the rigidity and toughness of the plates can be adjusted through the content of cobalt.

More specifically, when forming a plate with high rigidity, the ratio of cobalt contained in tungsten carbide is about 5 wt%. In addition, when forming a plate with high toughness, the ratio of cobalt contained in tungsten carbide is about 30 wt%. However, the metal saw system related to this embodiment is not limited to this. Depending on the desired properties of the metal saw, and depending on the type of object to be processed, the rigidity and toughness are determined together with the thickness of each plate.

Furthermore, in the metal saw according to the present embodiment, a high-hardness concrete material (particles) made of a material such as diamond and alumina is mixed in the first plate and the third plate. When the concrete materials (particles) are mixed in the first plate-shaped object and the third plate-shaped object, the abrasion resistance is higher than that of other materials constituting each plate-shaped object. When the first plate and the third plate that become the two sides of the metal saw are mixed with the concrete material (particles), the abrasion of the metal saw can be reduced, and the life of the metal saw can be increased. However, the metal saw related to this embodiment is not limited to the case where it contains a concrete material.

In addition, in the saw blade 28b of the metal saw 28 according to the present embodiment, the tie cutting blade portion 28c is formed of the first to third plate-shaped objects, and the thickness of the portion to be cut can be sufficiently ensured. On the other hand, on the back 28d, the first plate 50a and the third plate 50c on the side of the saw blade 28b do not exist, so it can be ensured that it can be used to effectively remove the cutting chips generated from the workpiece. Space.

In addition, the present invention is not limited to the description of the above-mentioned embodiment, and can be implemented with various modifications. For example, in the above-mentioned embodiment, the case where there are three plate-like objects which comprise a metal saw was mainly demonstrated. However, the metal saw may be configured with four or more plates. In this case, the rigidity of the plates on both sides of the metal saw may be higher than the rigidity of the plates on the inner side.

Next, another aspect of the metal saw related to one aspect of the present invention will be described. The structure of the metal saw 28 according to another embodiment will be described with reference to FIGS. 4(A) to 4(C). Fig. 4(A) is a schematic diagram of the metal saw when viewed from the side, and Figs. 4(B) and 4(C) are diagrams schematically illustrating the cross-sectional structure of the metal saw in the thickness direction. The metal saw 28 related to other embodiments described below is different from the metal saw 28 related to the above-mentioned embodiment in the cross-sectional structure of the main back 28d.

FIG. 4(B) is a schematic diagram showing the cross-sectional structure of the metal saw 28 shown in FIG. 4(A) when the metal saw 28 is cut perpendicular to the side surface through the dash-dotted line AA ′. Fig. 4(B) is a view of the saw blade 28b including the cutting blade portion 28c in particular. 4(C) is a schematic diagram showing the cross-sectional structure when the metal saw 28 shown in FIG. 4(A) is cut perpendicular to the side surface through the dashed-dotted line BB '. Fig. 3(C) is a view of the saw blade 28b including the back part 28d in particular.

As shown in FIGS. 4(B) and 4(C), the metal saw 28 has a first plate 50a, a third plate 50c, and is covered by the first plate 50a and the third plate 50c. The sandwiched second plate 50b. As shown in FIG. 4(B), the cutting blade portion 28c is formed by the first plate 50a, the second plate 50b, and the third plate 50c. On the other hand, as shown in FIG. 4(C), the back 28d is formed by the first plate 50a and the third plate 50c.

The method of forming the metal saw 28 related to other embodiments will be described. First, metal powder is placed in a ring-shaped forming metal mold and cold-pressed to form a ring-shaped compact. Next, it is temporarily sintered at a low temperature (for example, 500° C.), and processed so as to have a predetermined thickness and shape to form each plate-like object. The first plate 50a and the third plate 50c are formed in a shape constituting the cutting blade portion 28c and the back portion 28d, and the second plate 50b is formed in a shape constituting the cutting blade portion 28c.

Next, the formed plates are laminated and sintered (for example, at 900°C) to be integrated. Sintering is performed in a state where the first to third plate-shaped objects are sandwiched between two carbon plates with a predetermined pressure. In addition, in the two carbon plates, convex portions are formed in advance in the regions contacting the back 28d of the saw blade 28b, respectively.

In this way, the first plate 50a and the third plate 50c softened by the high temperature during sintering are pressed against the convex part of the carbon plate, and face the inside of the metal saw 28 in the area contacting the back 28d. Deformed. For this reason, both contact|abut so that the 2nd plate-like object 50b may be enclosed in the back 28d. In other words, the first plate 50a and the third plate 50c connect the second plate 50b to the back 28d. The way the defect is buried is deformed. Then, the edge grinding process is performed on the outer peripheral portion of the obtained sintered body, that is, the metal saw 28 is formed.

The saw blade 28b of the formed metal saw 28 has a cutting edge portion 28c formed by the first to third plates, and a back 28d formed by the first plate and the third plate. The metal saw The 28 series becomes a complicated structure. However, according to this other embodiment, the metal saw 28 with such a complicated structure can be easily manufactured. In addition, compared with the metal saw 28 related to the above-mentioned embodiment, the metal saw 28 related to this other embodiment is formed of a plate with high rigidity, so the rigidity of the back 28d becomes higher.

In addition, the back part 28d should just be comprised by at least one of a 1st plate-shaped object or a 3rd plate-shaped object. That is, it may be constituted by only one of the first plate-shaped object or the third plate-shaped object, or may be constituted by both the first plate-shaped object and the third plate-shaped object.

In addition, the structures, methods, and the like related to the above-mentioned embodiments can be implemented with appropriate changes as long as they do not depart from the scope of the object of the present invention.

28: metal saw

28a: opening

28b: saw blade

28c: Cutting edge

28d: back

50a: 1st plate

50b: 2nd plate

50c: 3rd plate

52a: Opening of the first plate

52b: Opening of the second plate

52c: The opening of the third plate

Claims (5)

A metal saw with a saw blade formed on the outer periphery, Integrally have a first plate, a third plate, and a second plate between the first plate and the third plate, and the saw blade has: A plurality of cutting blades formed by the first plate, the second plate, and the third plate; A plurality of backs formed by a first plate or a third plate on the rear side of the metal saw in the rotation direction of each of the plurality of cutting blade portions. A metal saw with a saw blade formed on the outer periphery, Integrally have a first plate, a third plate, and a second plate between the first plate and the third plate, and the saw blade has: A plurality of cutting blades formed by the first plate, the second plate, and the third plate; A plurality of backs formed by a first plate or a third plate on the rear side of the metal saw in the rotation direction of each of the plurality of cutting blade portions; The first plate and the third plate have higher rigidity than the second plate. A metal saw with a saw blade formed on the outer periphery, The metal saw is integrally provided with a first plate, a third plate, and a second plate between the first plate and the third plate, The saw blade has: A plurality of cutting blades formed by the first plate, the second plate, and the third plate; Behind each of the plurality of cutting blade portions in the direction of rotation of the metal saw Multiple backs formed by the first plate or the third plate on the side; The first plate and the third plate have higher rigidity than the second plate, The second plate-shaped object has higher toughness than the first plate-shaped object and the third plate-shaped object. Such as the metal saw of any one of claims 1 to 3, in which: The first plate and the third plate have stone materials. Such as the metal saw of any one of claims 1 to 3, in which: The constituent elements and ratios of the first plate-shaped object are different from the constituent elements and ratios of the second plate-shaped object.

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