CN107791371B - Metal saw - Google Patents
Metal saw Download PDFInfo
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- CN107791371B CN107791371B CN201710690626.3A CN201710690626A CN107791371B CN 107791371 B CN107791371 B CN 107791371B CN 201710690626 A CN201710690626 A CN 201710690626A CN 107791371 B CN107791371 B CN 107791371B
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- plate
- saw
- shaped object
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- metal saw
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/14—Apparatus or processes for treating or working the shaped or preshaped articles for dividing shaped articles by cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28D—WORKING STONE OR STONE-LIKE MATERIALS
- B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
- B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
- B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
- B28D1/048—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with a plurality of saw blades
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Sawing (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
Provided is a metal saw, which prevents the saw blade of the metal saw from wearing in the thickness direction. A metal saw having a saw blade formed on an outer peripheral portion thereof, the metal saw integrally including a first plate-like object, a third plate-like object, and a second plate-like object between the first plate-like object and the third plate-like object, the saw blade comprising: a plurality of cutting edges, each of which is composed of a first plate-shaped object, a second plate-shaped object and a third plate-shaped object; and a plurality of back portions each formed of a second plate-like material and located on a rear side in a rotation direction of the metal saw with respect to each of the plurality of cutting portions, wherein the first plate-like material and the third plate-like material have higher rigidity than the second plate-like material, and the second plate-like material has higher toughness than the first plate-like material and the third plate-like material. The first plate and the third plate may have an abrasive. The constituent elements and their ratios of the first plate-like object may be made different from those of the second plate-like object.
Description
Technical Field
The present invention relates to a metal saw used for cutting ceramics or the like before sintering.
Background
One of semiconductor devices used in mobile phones and the like is a multilayer ceramic capacitor. Several hundreds of such multilayer ceramic capacitors are mounted on one mobile phone, and the multilayer ceramic capacitors are mass-produced every day and are consumed in large quantities.
A multilayer ceramic capacitor is manufactured by first laminating a plurality of green ceramic (ceramic before firing) plate-like objects, dividing the laminate into individual chip capacitors by a cutting device, and then firing the chip capacitors. In addition, when the cutting device is used to perform division after sintering, thermal deformation occurs due to high temperature during sintering, strain occurs in the arrangement of chip capacitors, and precise cutting is difficult.
The step of dividing the plurality of green ceramic plate-like laminates into the individual chip capacitors by the cutting device is performed by the cutting device to which the jig saw is attached. Patent document 1 discloses a metal cutting saw (rotary cutter) having a saw blade formed on the outer periphery thereof for cutting green ceramics.
Patent document 1: japanese laid-open patent publication No. 4-179505
However, when the cutting work of the green ceramic is repeated using the metal saw, the saw blade on the outer periphery of the metal saw is worn. In particular, since a cutting load is large at corners (corners between the side surfaces of the metal saw and the cutting surface) at both ends in the thickness direction of the cutting surface (the surface between one side surface and the other side surface of the metal saw) of the saw blade, the saw blade is worn sharply, and the saw blade gradually changes to a shape in which the corners are rounded.
When the corner of the blade of the metal saw is worn and becomes a shape in which the corner is rounded, the shape is reflected on the portion to be processed at the cutting portion of the green ceramic that has been cut. Therefore, the following problems arise: the side surfaces of the respective chip capacitors manufactured by division are also formed into shapes reflecting the shapes.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object thereof is to provide a metal cutting saw capable of suppressing wear of a corner portion of a saw blade. Further, a metal saw is provided, in which the side surface of the chip capacitor formed by the metal saw is not formed into an abnormal shape even when the metal saw is used for dividing the green ceramic.
According to one aspect of the present invention, there is provided a metal cutting saw having a saw blade formed on an outer peripheral portion thereof, the metal cutting saw integrally including a first plate-like object, a third plate-like object, and a second plate-like object between the first plate-like object and the third plate-like object, the saw blade including: a plurality of cutting edges, each of which is composed of a first plate-shaped object, a second plate-shaped object and a third plate-shaped object; and a plurality of back portions each formed of a second plate-like object and located on a rear side in a rotation direction of the metal saw with respect to each of the plurality of cutting edge portions.
According to another aspect of the present invention, there is provided a metal cutting saw having a saw blade formed on an outer peripheral portion thereof, the metal cutting saw integrally including a first plate-like object, a third plate-like object, and a second plate-like object between the first plate-like object and the third plate-like object, the saw blade including: a plurality of cutting edges, each of which is composed of a first plate-shaped object, a second plate-shaped object and a third plate-shaped object; and a plurality of back portions each formed of a first plate-like object or a third plate-like object and located on a rear side in a rotation direction of the metal saw with respect to each of the plurality of cutting edge portions.
Further, according to another aspect of the present invention, there is provided a metal cutting saw having a saw blade formed on an outer peripheral portion thereof, the metal cutting saw integrally including a first plate-like object, a third plate-like object, and a second plate-like object between the first plate-like object and the third plate-like object, the saw blade including: a plurality of cutting edges, each of which is composed of a first plate-shaped object, a second plate-shaped object and a third plate-shaped object; and a plurality of back portions each formed of a second plate-like object and located on a rear side in a rotation direction of the metal saw with respect to each of the plurality of cutting edge portions, the first plate-like object and the third plate-like object having higher rigidity than the second plate-like object.
According to another aspect of the present invention, there is provided a metal cutting saw having a saw blade formed on an outer peripheral portion thereof, the metal cutting saw integrally including a first plate-like object, a third plate-like object, and a second plate-like object between the first plate-like object and the third plate-like object, the saw blade including: a plurality of cutting edges, each of which is composed of a first plate-shaped object, a second plate-shaped object and a third plate-shaped object; and a plurality of back portions each of which is formed of a first plate-like object or a third plate-like object and is located on a rear side in a rotation direction of the metal saw with respect to each of the plurality of cutting edge portions, the first plate-like object and the third plate-like object having higher rigidity than the second plate-like object.
Further, according to another aspect of the present invention, there is provided a metal cutting saw having a saw blade formed on an outer peripheral portion thereof, the metal cutting saw integrally including a first plate-like object, a third plate-like object, and a second plate-like object between the first plate-like object and the third plate-like object, the saw blade including: a plurality of cutting edges, each of which is composed of a first plate-shaped object, a second plate-shaped object and a third plate-shaped object; and a plurality of back portions each formed of a second plate-like material and located on a rear side in a rotation direction of the metal saw with respect to each of the plurality of cutting portions, wherein the first plate-like material and the third plate-like material have higher rigidity than the second plate-like material, and the second plate-like material has higher toughness than the first plate-like material and the third plate-like material.
Further, according to another aspect of the present invention, there is provided a metal cutting saw having a saw blade formed on an outer peripheral portion thereof, the metal cutting saw integrally including a first plate-like object, a third plate-like object, and a second plate-like object between the first plate-like object and the third plate-like object, the saw blade including: a plurality of cutting edges, each of which is composed of a first plate-shaped object, a second plate-shaped object and a third plate-shaped object; and a plurality of back portions each of which is formed of a first plate-like object or a third plate-like object and is located on a rear side of the cutting blade portion in a rotation direction of the jigsaw, the first plate-like object and the third plate-like object having higher rigidity than the second plate-like object, and the second plate-like object having higher toughness than the first plate-like object and the third plate-like object.
In the metal saw according to one embodiment of the present invention, the first plate-like object and the third plate-like object may have abrasive grains. In the metal saw according to one aspect of the present invention, the constituent elements and the ratio thereof in the first plate-like object may be different from those in the second plate-like object.
According to one embodiment of the present invention, there is provided a metalworking saw in which first to third plates can rotate as a single body. The metal saw according to one embodiment of the present invention is formed by integrating three or more plate-like objects, and thus the properties of the three or more plate-like objects can be independently set. For example, a plate-like object having high rigidity and a plate-like object having high toughness can be formed by laminating and bonding a plurality of the plate-like objects in the thickness direction.
For example, when the plate-like objects having high rigidity are arranged on both sides, the wear resistance of the corner of the blade of the metal saw can be improved. When the plate-like objects having high toughness are arranged between the plate-like objects having high rigidity, the durability of the metal saw is improved by strengthening the metal saw against external force or impact.
In addition, when the ceramic is cut by the jig saw in which the plate-like objects having high rigidity are disposed on both side surfaces that are easily exposed to friction and the plate-like objects having low rigidity are disposed on the inner side that is not easily exposed to friction, the cutting surface of the jig saw is uniformly worn. That is, the corner of the blade of the metal saw is not worn and rounded. Therefore, the side surface of the formed chip capacitor does not have an abnormal shape.
In the metal working saw according to one aspect of the present invention, the saw blade has a cutting edge portion and a back portion. The cutting edge portion for cutting the ceramics is formed of the first to third plates, and the thickness of the portion for cutting can be sufficiently ensured. On the other hand, in the back portion which is not a portion for cutting, since the first plate-like object and the third plate-like object on the side surface side of the saw blade are not present, a space capable of effectively discharging chips generated at the time of cutting can be secured.
Therefore, the corner of the cutting edge portion of the saw blade can be reduced from being worn during cutting. Further, such a shape having the cutting edge portion and the back portion can be easily formed only by adjusting the shape of each plate-like object without performing complicated processing on the metal saw, and therefore, the cost of manufacturing the metal saw can be suppressed.
Therefore, according to one aspect of the present invention, a metal saw capable of suppressing wear of a corner portion of a saw blade is provided. Further, a metal saw is provided in which the side surface of the chip capacitor formed does not have an abnormal shape even when the metal saw is used for dividing a green ceramic.
Drawings
Fig. 1 is a perspective view showing an example of a cutting apparatus.
Fig. 2 is a perspective view schematically illustrating the configuration of the cutting unit.
Fig. 3 (a) is a schematic view of the metal saw as viewed from the side, and fig. 3 (B) and 3 (C) are views schematically illustrating a cross-sectional structure of the metal saw.
Fig. 4 (a) is a schematic view of a gold saw according to another embodiment as viewed from the side, and fig. 4 (B) and 4 (C) are schematic views illustrating a cross-sectional structure of the gold saw.
Description of the reference symbols
2: a cutting device; 4: a main body; 6: a display monitor; 8: an outer cover; 10: a cutting unit; 12: a holding table; 14: a mounting table; 16: a spindle housing; 18: a main shaft; 18 a: an opening; 20: a rear flange; 22: a flange portion; 22 a: an opening; 22 b: an abutting surface; 24: a boss portion; 26: fixing the bolt; 26 a: an outer peripheral surface; 28: sawing by a metalworker; 28 a: an opening; 28 b: a saw blade; 28 c: cutting the blade part; 28 d: a back; 30: a front flange; 30 a: an opening; 32: fixing a nut; 32 a: an opening; 32 b: an inner wall surface; 34: a cutter cover; 36: a tool cover body; 38: a sliding cover; 40: a cylinder; 42: a connector; 44: a nozzle; 46: a connector; 48: a connector; 50 a: a first plate-like object; 50 b: a second plate-like object; 50 c: a third plate; 52 a: an opening of the first plate; 52 b: an opening of the second plate; 52 c: an opening of the third plate-like object.
Detailed Description
Embodiments of the present invention will be explained. Fig. 1 is a perspective view showing an external appearance of a cutting device 2 for cutting a workpiece such as ceramics, as an example of a cutting device using a metal saw according to the present embodiment. The cutting device 2 is configured to include: a main body 4 for housing a cutting unit 10 having the metal saw in an exterior cover 8; and a display monitor 6 mounted on an exterior cover 8 of the main body 4.
A touch panel type display monitor 6 is disposed on the front surface of the outer cover 8. The operator inputs an instruction to the apparatus through the display monitor 6, and the operating state of the apparatus 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 adjacent to the cutting unit 10 is disposed to be movable in the X-axis direction. The holding table 12 holds the workpiece during machining. The mounting table 14 is a mounting table (elevator) for mounting a cassette capable of accommodating a plurality of workpieces therein, and is configured to be movable in the vertical direction.
When a cassette for storing a workpiece is placed on the mounting table 14, the cutting apparatus 2 carries the workpiece out of the cassette and places the workpiece on the holding table 12 by a predetermined carrying mechanism. The holding table 12 applies a negative pressure from a suction source, not shown, to suck and hold the workpiece on the holding table 12.
Here, a more detailed configuration of the cutting unit 10 will be described with reference to fig. 2. Fig. 2 is an exploded view schematically illustrating the construction of the cutting unit 10. As shown in fig. 2, the cutting unit 10 includes, for example, a spindle housing 16 fixed to a moving mechanism (not shown) of the cutting device 2. Inside the spindle housing 16, a spindle 18 extending in the front-rear direction (Y-axis direction) is rotatably supported. A front end portion (front end portion) of the spindle 18 protrudes forward from the spindle housing 16.
An opening 18a is formed at the tip end of the main shaft 18, and a screw groove is provided on an inner wall surface 18b of the opening 18 a. A rear flange 20 made of a material including a ferromagnetic material is attached to a front end portion of the main shaft 18. The rear flange 20 includes a flange portion 22 extending radially outward and a boss portion 24 protruding forward from a front surface (front surface) of the flange portion 22.
An opening 22a penetrating the flange portion 22 in the front-rear direction is formed in the center of the flange portion 22. A fitting portion (not shown) into which the tip end portion of the spindle 18 can be fitted is formed on the rear surface (rear surface) side of the flange portion 22. The fitting portion is provided at a position corresponding to the opening 22 a.
When the fixing bolts 26 are fastened to the opening 22a and the opening 18a in a state where the tip end 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. Further, a thread corresponding to the thread groove of the opening 18a is provided on the outer peripheral surface 26a of the fixing bolt 26.
The front surface on the outer peripheral side of the flange portion 22 serves as a contact surface 22b that contacts the rear side surface of the metal saw 28. The abutment surface 22b is formed in an annular shape when viewed from the axial direction (Y-axis direction) of the spindle 18. The boss portion 24 is formed in a cylindrical shape, and a screw thread is provided on an outer peripheral surface 24a thereof.
A circular opening 28a through which the boss portion 24 is inserted is formed in the center of the metal saw 28, and the metal saw 28 is attached to the rear flange 20 by inserting the boss portion 24 through the opening 28 a.
In a state where the metal saw 28 is attached to the rear flange 20, an annular front flange 30 is attached to a front side surface of the metal saw 28. An opening 30a is formed in the center of the front flange 30, and the boss portion 24 of the rear flange 20 is fitted into the opening 30 a. The rear surface of the front flange 30 on the outer peripheral side serves as a contact surface (not shown) that contacts the side surface of the front side of the jig saw 28. The abutment surface is provided at a position corresponding to the abutment surface 22b of the rear flange 20.
After the front flange 30 is attached, an annular fixing nut 32 is fastened to the front end of the boss portion 24. Thereby, the front flange 30 is pressed against the rear flange 20, and the metal saw 28 is sandwiched between the rear flange 20 and the front flange 30. An opening 32a is formed in the fixing nut 32, and a screw groove is provided in an inner wall surface 32b of the opening 32 a.
A tool cover 34 for housing the metal saw 28 and the like attached to the spindle 18 is provided on the front surface of the spindle housing 16. The tool cover 34 is constituted by a tool cover body 36 and a slide cover 38, wherein the tool cover body 36 is fixed to the front surface of the spindle housing 16, and the slide cover 38 is slidable in the left-right direction (X-axis direction) with respect to the tool cover body 36.
The slide cover 38 is coupled to the tool cover body 36 via an air cylinder 40 and slides by air supplied through a coupler 42. When the slide cover 38 is slid to close the tool cover 34 after the metal saw 28 is attached to the spindle 18, the metal saw 28 can be accommodated inside the tool cover 34.
A pair of substantially L-shaped nozzles 44 are fixed to the slide cover 38, and sandwich a lower portion of the metal saw 28 in the front-rear direction. The cutting water is supplied to the nozzle 44 through a coupler 46 provided on the slide cover 38. A plurality of slits (not shown) are formed at the tip end side of the nozzle 44 so as to face the metal saw 28. Cutting water is supplied through the plurality of slits.
On the other hand, the tool cover body 36 is provided with a supply hole (not shown) for supplying cutting water to the metal saw 28. The supply hole is connected to a coupler 48 provided in the tool cover body 36, and the cutting water supplied from the supply hole through the coupler 48 is used to cool and clean the metal saw 28.
Next, the structure of the metal saw 28 will be described with reference to fig. 3 (a) to 3 (C). Fig. 3 (a) is a schematic view of the metal saw as viewed from the side, and fig. 3 (B) and 3 (C) are views schematically illustrating a cross-sectional structure of the metal saw in the thickness direction.
As shown in fig. 3 (a), a circular opening 28a through which the boss portion 24 is inserted is formed in the center of the metal saw 28. A saw blade 28b is formed on the outer periphery of the metal saw 28. When the spindle 18 of the cutting unit 10 rotates, the metalworking saw 28 mounted on the cutting unit 10 rotates in accordance with the rotation. When the tip of the rotating metal saw 28 reaches the workpiece, the workpiece is cut by the saw blade 28 b.
The saw blade 28b has a plurality of cutting edge portions (rake faces) 28c and a plurality of back portions (flank faces) 28d, and each of the plurality of back portions (flank faces) 28d is located on the rear side of the plurality of cutting edge portions 28c in the rotation direction of the metal saw 28. Each cutting edge portion 28c is shaped to protrude in the outer circumferential direction of the metal saw 28 from the adjacent back portion 28d, and cuts the workpiece. Each back portion 28d has a shape that cuts into the center of the metal saw 28 more than the adjacent cutting edge portion 28c, and secures a space for efficiently discharging chips generated by cutting.
Fig. 3 (B) is a schematic view showing a cross-sectional structure when the metal saw 28 shown in fig. 3 (a) is cut by a surface perpendicular to the side surface and passing through a chain line a-a'. Fig. 3 (B) is a view including the saw blade 28B, particularly the cutting edge portion 28 c. Fig. 3 (C) is a schematic view showing a cross-sectional structure of the metal saw 28 shown in fig. 3 (a) cut perpendicular to the side surface and by a dashed line B-B'. Fig. 3 (C) is a view including the back 28d of the saw blade 28 b.
As shown in fig. 3 (B) and 3 (C), the metal saw 28 includes a first plate 50a, a third plate 50C, and a second plate 50B sandwiched between the first plate 50a and the third plate 50C. As shown in fig. 3 (B), the cutting edge portion 28c is composed of a first plate-like object 50a, a second plate-like object 50B, and a third plate-like object 50 c. On the other hand, as shown in fig. 3 (C), the back 28d is formed of the second plate 50 b.
A method of forming the gold saw 28 will be described. First, a metal powder is added to an annular molding die and cold-pressed to form an annular green compact. Next, the formed annular green compact is laminated into three layers and sintered to be integrated. When the outer peripheral portion of the obtained sintered body is subjected to the cutting edge grinding process, the metal saw 28 is formed.
The blade 28b of the formed jig saw 28 has a cutting edge portion 28c formed of first to third plate-like objects and a back portion 28d formed of a second plate-like object, and the jig saw 28 has a complicated structure. However, since the gold saw 28 of the present embodiment can be manufactured by forming each plate-like object in a shape changed in this way and sintering the formed object, complicated processing is not required for manufacturing the gold saw 28.
For example, when the shape of the metal saw 28 is to be formed from a single plate-like object, it is necessary to cut each back portion 28d in order to form the shape of the back portion 28d, which takes a lot of labor. However, the gold saw 28 of the present embodiment is formed without such a time and effort. Therefore, the metal saw 28 including the saw blade 28b having the cutting edge portion 28c and the back portion 28d having a thickness different from that of the cutting edge portion 28c can be manufactured at a low cost.
In addition, when the first to third plate-like objects are manufactured, the physical properties of the respective plate-like objects can be adjusted by adjusting the structural material, composition, and the like of the metal powder as the raw material. By adjusting the physical properties of the first to third plate-like objects, the physical properties of the sintered metal saw 28 can be adjusted.
For example, in the metal saw 28 of the present embodiment, the physical properties of the first to third plate-like objects can be adjusted so that the rigidity of the first plate-like object 50a and the rigidity of the third plate-like object 50c are higher than the rigidity of the second plate-like object 50b, respectively.
In general, when cutting work is repeated using a metal saw, the following tendency is observed in the cutting edge portion of the saw blade: the corners of both ends in the thickness direction are worn, and the corners of the saw blade 28b on the outer periphery of the metal saw gradually change to a rounded shape.
Therefore, in the metal saw 28 of the present embodiment, the structural materials, compositions, and the like of the first to third plate-like objects are adjusted so that the rigidity of the first plate-like object 50a and the third plate-like object 50c is higher than the rigidity of the second plate-like object 50b on the inner side. Accordingly, the metal saw 28 has high wear resistance because both side surfaces of the metal saw 28 are formed into a plate-like object having high rigidity. Therefore, the metal saw 28 is less likely to change in shape due to wear, and the shape of the side surface of the chip capacitor formed by cutting with the metal saw 28 is less likely to be in an abnormal state.
However, in general, when the rigidity of the metal saw is increased, the hardness is increased, but on the other hand, the metal saw tends to become brittle, and the possibility of damage due to impact or the like is increased. Therefore, merely increasing the hardness of the metal saw to realize a metal saw having excellent wear resistance has a problem of impact resistance.
Therefore, in the metal saw 28 of the present embodiment, the structural material, the composition, and the like of the second plate-like object are adjusted so that the toughness of the second plate-like object 50b sandwiched between the first plate-like object 50a and the third plate-like object 50c is improved. The impact resistance of the plate-like object having high toughness is improved, and the impact received from the outside is alleviated.
When the toughness of the second plate-like object 50b is higher than the toughness of the first and third plate-like objects, the second plate-like object 50b alleviates the impact when the impact is applied to the hack saw 28 from the outside. Thus, the first plate-like object and the third plate-like object having high rigidity can be prevented from being damaged by the impact. The second plate-like objects 50b are high in toughness and low in abrasion resistance, and therefore easily abraded when repeatedly cut by the metal saw 28, but the second plate-like objects 50b are not present at both end portions where abrasion is particularly easily generated, and thus can withstand long-term use.
That is, since the metal saw 28 of the present embodiment includes the first plate-like object 50a and the third plate-like object 50c on the side surface side where wear is likely to occur, it is possible to suppress a change in shape due to wear of the side surface of the saw blade 28 b. On the other hand, since the second plate-like object 50b having high toughness is provided on the inner side, even if an impact is applied to the metal saw 28, generation of damage or the like can be suppressed. Therefore, the life of the metal saw 28 can be extended.
The rigidity and toughness of the plate-like object are adjusted by the constituent elements of the plate-like object and the ratio (content ratio) thereof. For example, the rigidity and toughness of the first plate-like object are adjusted by making the ratio of the constituent elements and their contents different from those of the second plate-like object. For each plate-like object used in the sawing machine 28, for example, a material obtained by mixing cobalt as a binder with Tungsten Carbide (Tungsten Carbide) is used, and the rigidity and toughness of the plate-like object can be adjusted by the content of cobalt.
More specifically, when a plate-like object having high rigidity is formed, the proportion of cobalt contained in tungsten carbide is set to about 5% by weight. When a plate-like object having high toughness is formed, the proportion of cobalt contained in tungsten carbide is about 30 wt%. However, the metal saw according to the present embodiment is not limited thereto. The rigidity and toughness are determined according to the desired properties of the metal saw and the type of the object to be processed, together with the thickness of each plate-like object.
In the metal saw according to the present embodiment, abrasive grains (particles) having high hardness, which are made of a material such as diamond or alumina, are mixed into the first plate-like object and the third plate-like object. When the abrasive (particles) is mixed into the first plate-like object and the third plate-like object, the wear resistance is improved as compared with other raw materials constituting the respective plate-like objects. When the abrasive (particles) is mixed into the first plate-like object and the third plate-like object which are two side surfaces of the metal saw, the abrasion of the metal saw can be reduced, and the service life of the metal saw can be prolonged. However, the metal cutting saw of the present embodiment is not limited to the case of including the abrasive.
In the saw blade 28b of the metal saw 28 of the present embodiment, the cutting edge portion 28c is formed of the first to third plates, and the thickness of the portion to be cut can be sufficiently secured. On the other hand, in the back portion 28d, since the first plate-like object 50a and the third plate-like object 50c on the side surface side of the saw blade 28b do not exist, a space for effectively removing chips generated from the workpiece can be secured.
The present invention is not limited to the above embodiments, and can be implemented by various modifications. For example, in the above embodiment, a case where three plate-like objects constituting the metal saw are mainly described. However, the plate-shaped objects constituting the metal saw may be formed of four or more plates, and in this case, the rigidity of the plate-shaped objects on both side surfaces of the metal saw may be higher than the rigidity of the plate-shaped objects on the inner side.
Next, another embodiment of the metal saw according to one embodiment of the present invention will be described. The structure of the jig saw 28 according to another embodiment will be described with reference to fig. 4 (a) to 4 (C). Fig. 4 (a) is a schematic view of the metal saw as viewed from the side, and fig. 4 (B) and 4 (C) are views schematically illustrating a cross-sectional structure of the metal saw in the thickness direction. The metal saw 28 according to another embodiment to be described below is different from the metal saw 28 according to the above-described embodiment mainly in a sectional structure of the back portion 28 d.
Fig. 4 (B) is a schematic view showing a cross-sectional structure when the metal saw 28 shown in fig. 4 (a) is cut by a surface perpendicular to the side surface and passing through a chain line a-a'. Fig. 4 (B) is a view including the saw blade 28B, particularly the cutting edge portion 28 c. Fig. 4 (C) is a schematic view showing a cross-sectional structure of the metal saw 28 shown in fig. 4 (a) cut perpendicular to the side surface and by a dashed line B-B'. Fig. 4 (C) is a view including the back 28d of the saw blade 28 b.
As shown in fig. 4 (B) and 4 (C), the metal saw 28 includes a first plate 50a, a third plate 50C, and a second plate 50B sandwiched between the first plate 50a and the third plate 50C. As shown in fig. 4 (B), the cutting edge portion 28c is composed of a first plate-like object 50a, a second plate-like object 50B, and a third plate-like object 50 c. On the other hand, as shown in fig. 4 (C), the back 28d is composed of a first plate 50a and a third plate 50C.
A method of forming the gold saw 28 according to another embodiment will be described. First, a metal powder is added to an annular molding die and cold-pressed to form an annular green compact. Then, the plate-like objects are formed by performing pre-sintering at a low temperature (for example, 500 ℃) to form the plate-like objects into predetermined thicknesses and shapes. The first plate 50a and the third plate 50c are formed in a shape constituting the cutting edge portion 28c and the back portion 28d, and the second plate 50b is formed in a shape constituting the cutting edge portion 28 c.
Next, the formed plates are stacked and sintered (for example, 900 ℃ C.) to be integrated. The sintering is performed in a state where the first to third plates are sandwiched between two carbon plates at a predetermined pressure. In addition, convex portions are formed in advance in regions corresponding to the back portions 28d of the saw blades 28b on the two carbon plates.
Then, the first plate-like object 50a and the third plate-like object 50c, which are softened by exposure to a high temperature during sintering, are pressed into the convex portions of the carbon plate, and are deformed toward the inside of the metal saw 28 in the region corresponding to the back portion 28 d. Therefore, in the back portion 28d, the two abut to enclose the second plate-like object 50 b. In other words, in the back 28d, the first plate 50a and the third plate 50c are deformed so as to fill the missing portion of the second plate 50 b. Then, when the outer peripheral portion of the obtained sintered body is subjected to the edge grinding process, the metal saw 28 is formed.
The saw blade 28b of the formed metal saw 28 has a cutting edge portion 28c formed of the first to third plates and a back portion 28d formed of the first and third plates, and the metal saw 28 has a complicated structure. However, according to the another embodiment, the jig saw 28 having such a complicated structure can be easily manufactured. In addition, since the back 28d of the metal saw 28 according to the other embodiment is formed of a plate-like object having high rigidity, the rigidity of the back 28d is improved as compared with the metal saw 28 according to the above-described embodiment.
The back 28d may be formed of at least one of the first plate-like object and the third plate-like object. That is, the first plate-like object and the third plate-like object may be constituted by only one of the first plate-like object and the third plate-like object, or both of the first plate-like object and the third plate-like object.
In addition, the structure, method, and the like of the above embodiments may be modified as appropriate without departing from the scope of the object of the present invention.
Claims (6)
1. A metal saw having a saw blade formed on the outer periphery thereof, characterized in that,
the metal saw is integrally provided with a first plate-shaped object, a third plate-shaped object and a second plate-shaped object between the first plate-shaped object and the third plate-shaped object,
the saw blade has:
a plurality of cutting edges, each of which is composed of a first plate-shaped object, a second plate-shaped object and a third plate-shaped object; and
a plurality of back parts which are composed of second plate-shaped objects and are respectively positioned at the rear side of the rotation direction of the metal saw of the plurality of cutting edge parts,
the first plate and the third plate are more rigid than the second plate.
2. A metal saw having a saw blade formed on the outer periphery thereof, characterized in that,
the metal saw is integrally provided with a first plate-shaped object, a third plate-shaped object and a second plate-shaped object between the first plate-shaped object and the third plate-shaped object,
the saw blade has:
a plurality of cutting edges, each of which is composed of a first plate-shaped object, a second plate-shaped object and a third plate-shaped object; and
a plurality of back parts which are composed of a first plate-shaped object or a third plate-shaped object and are respectively positioned at the rear side of the rotation direction of the metal saw of the plurality of cutting edge parts,
the first plate and the third plate are more rigid than the second plate.
3. A metal saw having a saw blade formed on the outer periphery thereof, characterized in that,
the metal saw is integrally provided with a first plate-shaped object, a third plate-shaped object and a second plate-shaped object between the first plate-shaped object and the third plate-shaped object,
the saw blade has:
a plurality of cutting edges, each of which is composed of a first plate-shaped object, a second plate-shaped object and a third plate-shaped object; and
a plurality of back parts which are composed of second plate-shaped objects and are respectively positioned at the rear side of the rotation direction of the metal saw of the plurality of cutting edge parts,
the first and third plates are more rigid than the second plate,
the second plate has a higher toughness than the first plate and the third plate.
4. A metal saw having a saw blade formed on the outer periphery thereof, characterized in that,
the metal saw is integrally provided with a first plate-shaped object, a third plate-shaped object and a second plate-shaped object between the first plate-shaped object and the third plate-shaped object,
the saw blade has:
a plurality of cutting edges, each of which is composed of a first plate-shaped object, a second plate-shaped object and a third plate-shaped object; and
a plurality of back parts which are composed of a first plate-shaped object or a third plate-shaped object and are respectively positioned at the rear side of the rotation direction of the metal saw of the plurality of cutting edge parts,
the first and third plates are more rigid than the second plate,
the second plate has a higher toughness than the first plate and the third plate.
5. The metalworking saw of any of claims 1 to 4,
the first plate and the third plate have an abrasive.
6. The metalworking saw of any of claims 1 to 4,
the first plate-like object has different constituent elements and ratios thereof from those of the second plate-like object.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-170085 | 2016-08-31 | ||
| JP2016170085A JP6882828B2 (en) | 2016-08-31 | 2016-08-31 | Metal saw |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107791371A CN107791371A (en) | 2018-03-13 |
| CN107791371B true CN107791371B (en) | 2021-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710690626.3A Active CN107791371B (en) | 2016-08-31 | 2017-08-14 | Metal saw |
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| Country | Link |
|---|---|
| JP (1) | JP6882828B2 (en) |
| KR (1) | KR102219721B1 (en) |
| CN (1) | CN107791371B (en) |
| TW (2) | TWI758302B (en) |
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- 2017-07-06 TW TW110113435A patent/TWI797592B/en active
- 2017-08-14 CN CN201710690626.3A patent/CN107791371B/en active Active
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| JP2002160166A (en) * | 2000-11-22 | 2002-06-04 | Allied Material Corp | Super abrasive grain tool |
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| CN202894480U (en) * | 2012-10-11 | 2013-04-24 | 昆山兼房高科技刀具有限公司 | Double-layer-structure plate-shaped tool |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP2018034265A (en) | 2018-03-08 |
| JP6882828B2 (en) | 2021-06-02 |
| KR20180025196A (en) | 2018-03-08 |
| TWI758302B (en) | 2022-03-21 |
| KR102219721B1 (en) | 2021-02-23 |
| TW201811472A (en) | 2018-04-01 |
| TWI797592B (en) | 2023-04-01 |
| CN107791371A (en) | 2018-03-13 |
| TW202130432A (en) | 2021-08-16 |
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