JP7374417B2 - Tip attachment structure and method for tip saw - Google Patents

Description

The present invention mainly relates to a tip attachment structure and method for a tipped saw suitable for cutting hard materials such as concrete moldings, stone glass fiber products, carbon fiber products, and mineral materials.

Generally, for cutting hard materials such as those mentioned above, a diamond tip saw with a diamond tip attached to the side end of a band as shown in Patent Document 1, or a tip saw with a tip attached to a disk-shaped base metal as shown in Patent Document 2 are generally used. Are known.

The above-mentioned tipped saws are manufactured by joining a sintered tip of cemented carbide metal or a sintered tip containing diamond to the tool body by brazing, laser welding, etc., or by dispersing and plating diamond by electrodeposition to fix it. method is known.

In addition, as shown in Patent Document 3, a sintered material of a hard cutting edge material is housed in a firing mold, filled with a hard tip body material and fired again, and then press-fitted and attached to a saw plate. It has been known.

Japanese Patent Application Publication No. 5-337933 Japanese Patent Application Publication No. 2013-193200 Japanese Patent Application Publication No. 2010-234497

However, the chip saws of Patent Documents 1 and 2 require large-scale production equipment for firing the chips under high temperature and high pressure, and since the chips are attached by brazing, etc., there are many work steps and the workability is poor. was there.

Furthermore, the tip disclosed in Patent Document 3 is a removable and replaceable insert type, which has the advantage of making it easy to attach and remove the tip.However, when cutting stone or concrete, a large load is placed on the tip itself, which causes problems with its adhesion. In addition, the tip itself was fired twice: the first forming (firing) the cutting edge, and the second forming (firing) filling the main body with material, making it difficult to manage dimensions for insertion and fixation. For cutting other hard materials such as stone and concrete, press-fitting the tip onto the blade alone is insufficient to secure the tip.

In order to solve the above problems, the present invention firstly attaches a large number of chips 1 to a blade 2 serving as a tool body at predetermined intervals, and press-fits the chips 1 into receiving grooves 16 on the blade 2 side corresponding to the chips 1. In the chip mounting structure of a fixed chip saw, at least a part of the leg portion 12a formed protrudingly on the mounting surface side of the chip 1 is press-fitted into the receiving groove 16 so as to follow the shape of the receiving groove 16. A deformation part 12b that undergoes plastic deformation is formed, and the tip 1 is removably locked on the blade 2 side, and a slit 11 into which the blade 2 is inserted is provided on the mounting surface side of the tip 1. It is characterized by having a protruding leg portion 12a .

Second , the chip 1 is provided with a plurality of legs 12a, a deformable portion 12b is provided at the tip of the leg portion 12a, and a deformable groove is press-fitted into the bottom of the receiving groove 16 to receive and deform the deformable portion 12b. 16b is provided.

Thirdly , it is characterized in that at least two leg portions 12a are provided, and the deformed portions 12b provided at the tips of the two leg portions 12a are deformed into a V-shape that widens toward the end.

Fourthly , the tip 1 is composed of a grinding layer 7 on the processing surface side involved in processing the workpiece 3 and a tip body 6 to which the grinding layer 7 is integrally attached, and at least the leg portion 12a is made of a soft material that can be plastically deformed. It is characterized by being formed by.

Fifth , the grinding layer 7 includes an abrasive material 9 made of hard granules and a soft metal material, and is sintered and bonded to the chip body 6.

Sixthly , the abrasive material 9 is granular diamond.

Seventhly , the metal material or the metal material and the material of the chip body 6 are characterized by containing Cu as a main component, 1 to 30 wt% of Sn, and 0 to 10 wt% of Ni.

Eighth , the tip 1 has a large number of receiving grooves 16 for attaching the tip formed in advance at predetermined intervals on the edge of the blade 2 comprising the tool body, and a grinding layer 7 is provided on the machining surface of the receiving groove 16. In this chip mounting method, when a mounting leg 12a protruding from the chip main body 6 integrally formed with the grinding layer 7 is press-fitted into the receiving groove 16, the leg 12a side is press-fitted. It is characterized in that the provided deformed portion 12b is press-fitted into the deformed groove 16b in the receiving groove 16, thereby plastically deforming it along the shape of the deformed groove 16b, thereby locking and fixing the chip 1 to the blade 2.

Ninth , the tips of at least two deformable parts 12b protruding from the chip body 6 are deformed in opposite directions when press-fitting, and when the chip is removed, each of the deformed parts 12b is re-deformed in the restoring direction and removable. It is characterized by

According to the chip mounting structure and method of the present invention configured as described above, the following effects are achieved.
(1) The deformed part due to plastic deformation of the leg protruding from the tip is locked in the receiving groove on the blade side, so the fixing force of the tip is maintained even when cutting hard materials such as stone and concrete. Since the chip has high durability and the deformed portion returns to its plastic shape when removed, it is easy to attach and detach the chip.

(2) Since the blade is inserted into the slit of the tip and fixed in a covered state, the tip is fixed stably and a sufficient cutting width can be secured.

(3) Since the tip consists of a grinding layer and the tip body, by changing the material of the tip body side depending on the processing conditions and other factors, it is possible to create a tip that meets various conditions. It is possible to secure the fixing force separately for each chip, and it is also possible to lock the chip by plastic deformation of the leg part.
Other effects will be made clear in the description of the embodiment.

FIG. 2 is a cross-sectional view showing a state in which a workpiece such as stone or concrete is being ground by a band saw to which the present invention is applied. FIG. 3 is a partially enlarged view showing a state in which the tip of the band saw is attached. FIG. 3 is an enlarged cross-sectional view showing the structure of diamond adhesion to the chip. (A) and (B) are a partial enlarged side sectional view and an end partial sectional view showing the structure of a diamond tip and a method of attaching it to a band saw blade.

Fig. 1 is a front view showing a working state in which a workpiece such as stone or concrete is being ground with a band saw to which the present invention is applied. On the other hand, the upper body is shown in which a plate-shaped or block-shaped workpiece 3 is pressed and fed while being ground and cut, and the feeding operation may be performed by either or both of the workpiece 3 and the band saw side. 4 is a cutting groove formed in the workpiece 3.

As shown in FIG. 2, the tip 1 has a tip body (base material) 6 portion fitted and fixed to the grinding end side of the blade 2 as described later, and the grinding layer 7 is entirely covered with the grinding (processing) surface. It is formed by being adhered and fixed over the entire area. As shown in FIG. 3, the grinding layer 7 has square groove-like irregularities 8 (recesses) formed in advance on the grinding surface of the chip body 6 in a direction substantially perpendicular to the transverse direction (grinding action direction of the chip 1). 8a and convex portions 8b) in a cross-sectional state that alternately intersects with the chip body 6, and the whole is integrally formed by sintering.

When manufacturing the chip 1, the chip body 6 is an unsintered chip that has a block-like or table-like structure in side view as shown in FIG. (The overall structure will be described later), a grinding layer 7 containing an abrasive material 9 is formed so as to fill and cover the square grooves 8a on the working surface of the workpiece 3 related to the grinding process. The unevenness 8 is useful for ensuring the adhesion strength (prevention of falling off) of the grinding layer 7 to the chip body 6 and the layer thickness. The recess 8a does not necessarily have to be a square groove, and may be formed at an angle along the grinding direction.

This grinding layer 7 is a liquid or paste-like mixture of diamond grains, ceramic grains, mineral grains, or a hard abrasive material 9 made of a mixture thereof, and metal powder mixed with a binder such as liquid paraffin, vaseline, oil, or synthetic resin. is applied to or dipped into the unevenness 8 of the unsintered chip body 6, and then dried, and then joined together with the chip body 6 by sintering under heating at, for example, around 1000°C, to form an integral piece. It has been transformed into These metals do not form a solid solution with diamond or form a compound, so they have the advantage of not interfering with the function of diamond as an abrasive grain (grinding material).

The metal powder added to the above mixture is mainly composed of Cu (copper) in this example, but it is in the range of 1 to 30 wt% of Sn (tin) and 0 to 10 wt% of Ni (nickel). The amount to be added is adjusted and blended according to the processing conditions such as the material.

In addition, it is desirable to use the same material as the metal powder for the tip body 6, which is an injection molding material, in order to increase the adhesion strength with the mixture and to easily and securely fit and fix it to the tool body, which will be described later. On the other hand, the material of the chip body 6 is not limited to this, as long as these functions can be ensured. By selecting the above-mentioned metal as the material for the metal component in the mixture, there is also the effect of ensuring the retention of the abrasive material 9 and improving the grinding performance during grinding (cutting) work.

Next, the shape of the tip 1 and the mechanism for attaching and detaching it to the tool body (blade) 2 of the band saw will be explained. FIGS. 4 and 2 show the structure of the tip 1 and the structure for attaching it to the blade 2. As shown in FIG. 4, the chip body 6 has the above-mentioned grinding layer 7 formed on the processing surface with the unevenness 8 on the top surface of the figure, and in this example, the thickness is 0.800 mm, the total length is 5.00 mm, and the total height is 5.00 mm. With a size of 1.50 mm, a square groove-shaped slit 11 with a bottom open type of 0.35 mm width and 3.00 mm depth into which the blade 2 is inserted is formed in the center of the wall thickness, and the inside of the slit 11 A gate-shaped insertion portion 12 having the same thickness as the slit width and a width of 4.00 mm in the left and right directions in the figure is formed with two left and right legs 12a and protrudes downward. The groove width of the slit 11 is set to a fitting tolerance slightly smaller than the plate thickness of the blade 2 in order to secure the fitting by press-fitting.

As shown in the figure, the leg portion 12a has a thin lower end portion forming a prismatic deformed portion 12b, an upper base end portion which is thickly formed into a trapezoidal shape, and a trapezoidal chevron-shaped slit 13 at the center of the left and right width. In addition, the deformed portion 12b is formed to protrude downward by about 0.75 mm from the lower ends of the front and rear walls 14 of the slit 11.

On the other hand, on one end of the blade 2, insertion grooves (receiving grooves) 16 having shapes corresponding to the slits 11 and 13 of the chip body 6 and the insertion portion 12 are formed at each mounting pitch of the chip 1. ing. However, the lower end portions of the leg receiving grooves 16a on both sides of the lower end of the receiving groove 16 are formed in a direction that opens toward the end in a V-shape along the left and right inclined surfaces of the trapezoidal chevron portion corresponding to the inclined surface of the slit 13. This is a deformed groove (locking groove) 16b.

The chip 1 is attached to the blade 2 in a crimped state by inserting the insert part 12 into the receiving groove 16 of the blade 2 while pressing it in the direction of insertion (direction of arrow _a1 ) as shown in FIG. 4(A). It will be done. When the tip 1 is inserted to the deepest part, when the deformed portion 12b protruding downward from the tip body 6 at right angles comes into contact with the widening inclined surface of the receiving groove 16, the pushing force pushes the tip outward along the inclined surface. It is pushed out toward the blade 2, guided to the deformation groove 16b at the lower end of the leg receiving groove 16a, plastically deformed along the shape, fixed to the blade 2 by caulking, and locked in the withdrawal direction. . As shown in FIG. 4(A), at this time, a slight clearance is ensured between the bottom surface of the deformation groove 16b and the lower end of the deformation portion 12b.

By press-fitting the tip 1 into the blade 2 as described above, the tip 1 is received and locked by the front and rear inner wall surfaces of the receiving groove 16 in the direction of the grinding operation, and in the direction of the tip 1 coming out (falling off). The deformation portion 12b and the deformation groove 16b are engaged to be fixed. The shape of the two deformation grooves 16b and the deformation portion 12b after deformation is not limited to the V-shape shown in the figure, but it is preferable that they deform in opposite directions, so they may be inwardly inclined.

As a result, the front and rear side walls 14 of the tip 1 and the grinding layer 7 side are fitted and fixed in the receiving groove 16 of the blade 2 in a manner that covers the cross section of the blade, ensuring fixing strength that can withstand the cutting process of the workpiece 3 shown in Fig. 1. I can do it. On the other hand, when the grinding layer 7 of the tip 1 is worn out due to use, by pulling the tip 1 upward as shown in FIGS. 2 and 4, the deformed portion 12b is deformed in the opposite direction and removed from the receiving groove 16, and a new tip is removed. It is possible to attach and detach it by replacing it with 1.

Incidentally, in the material of the tip body 6, in the resultant product of the sintering process, the leg portions 12a, especially the deformed portions 12b, are tightly crimped while being plastically deformed as described above during insertion and press-fitting, and the tip is retained (fixed) during the cutting operation. Any material (for example, HV80 to 120) that maintains strength and can be re-deformed into a reverse shape (the V-shape is parallel or nearly parallel to its original shape) when removed is sufficient.

Although granular diamond is most desirable as the abrasive material 9, it is also possible to use ceramics or other minerals depending on the cost, material of the workpiece, and other processing conditions, especially to improve the wear resistance of the abrasive layer. It is more effective to mix it with diamond grains.

In addition to the band saw shown in the above embodiment, the present invention can also be applied to a jigsaw, a chain saw, a hole saw, a circular saw type (rotary type) tip, etc. in which the tool body is equipped with a blade.

1 Tip 2 Tool body (blade)
3 Workpiece 6 Base material (chip body)
7 Grinding layer 8 Unevenness (8a: Square groove-shaped recess, 8b: Convex part)
9 Abrasive material (diamond grains)
11 Slit 12 Insertion part 12a Leg part 12b Deformation part 13 Slit 14 Side wall 16 Reception groove (insertion groove)
16a Leg receiving groove

Claims (9)

A large number of tips (1) were attached at predetermined intervals to the blade (2) that becomes the tool body, and the tips (1) were press-fitted and fixed into the receiving grooves (16) on the blade (2) side corresponding to the tips (1). In the tip mounting structure of a chip saw, at least a portion of the leg portion (12a) protruding from the mounting surface side of the tip (1) is press-fitted into the receiving groove (16 ). ), the tip (1) is removably locked on the blade (2) side , and the blade (12b) is formed on the mounting surface side of the tip (1). 2) A tip attachment structure for a tipped saw in which a slit (11) for inserting the tip is provided, and a downwardly directed leg (12a) is provided to protrude into the slit (11). The chip (1) is provided with a plurality of legs (12a), a deformed part (12b) is provided at the tip of the leg part (12a), and the deformed part (12b) is press-fitted into the bottom of the receiving groove (16). 2. The chip mounting structure for a chip saw according to claim 1 , further comprising a deforming groove (16b) for receiving and deforming the chip. The chip saw according to claim 1 or 2 , wherein at least two leg portions (12a) are provided, and the deformed portion (12b) provided at the tip of the two leg portions (12a) is deformed to widen toward the end in a V-shape. chip mounting structure. The chip (1) consists of a grinding layer (7) on the processing surface side involved in processing the workpiece (3) and a chip body (6) to which the grinding layer (7) is integrally attached. 4. The tip mounting structure for a tipped saw according to claim 1 , wherein the tip is made of a plastically deformable soft material. 5. The tip mounting structure for a tipped saw according to claim 4 , wherein the abrasive layer (7) includes an abrasive material (9) made of hard granules and a soft metal material, and is sintered and bonded to the tip body (6). The tip attachment structure for a tipped saw according to claim 5 , wherein the abrasive material (9) is granular diamond. The chip attachment structure for a chip saw according to claim 5 or 6 , wherein the metal material or the material of the metal material and the chip body (6) mainly contains Cu, 1 to 30 wt% of Sn, and 0 to 10 wt% of Ni. A large number of receiving grooves (16) for attaching chips are cut out in advance at predetermined intervals on the edge of the blade (2) comprising the tool body, and a grinding layer (7) is applied to the machining surface of the receiving grooves (16). A chip mounting method in which a provided chip (1) is press-fitted and fixed, wherein a mounting leg (12a) protruding from a chip body (6) integrally formed with the grinding layer (7) is inserted into the receiving groove. (16), the shape of the deformation groove (16b) is changed by press-fitting the deformation part (12b) provided on the leg part (12a) side into the deformation groove (16b) in the receiving groove (16 ). A tip attachment method for a tipped saw in which the tip (1) is locked and fixed to the blade (2) by plastic deformation along the tip . The tips of at least two deformable parts (12b) protruding from the chip body (6) are deformed in opposite directions when press-fitting, and when the chip is removed, each of the deformed parts (12b) is redirected in the restoration direction and removable. The method for attaching a tip to a tipped saw according to claim 8 , wherein the tip is deformed.

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