JP2005081458A - Throw-away type cutting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throw-away type cutting tool in which a tip is screwed into a tool body, increasing the re-grinding margin of the tip or increasing the number of times of re-grinding to effectively use the tip, and restraining a sharp rise in tool cost. <P>SOLUTION: The tip 4 is fixed to the tool body 1 with a fitting screw 7 engaged with a female screw opened to the base 2a of a tip seat 2. The side surface 4c of the tip 4 directed to the rear side in the cutting direction K abuts on a flat constraining surface 5c formed on a constraint member 5 adjacent to the side surface 4c and removably mounted on the tool body 1, and further the constraining surface 5c of the constraint member 5 advances toward the tip 4 side by a re-grinding amount S to keep abutting on the side surface 4c when the side surface 4c of the tip 4 is re-ground. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a cutting tool, and more particularly to a throw-away type cutting tool (hereinafter referred to as a cutting tool) of a type in which a throw-away tip (hereinafter referred to as a chip) is fixed to a chip seat with a mounting screw.

At least one of the upper and lower surfaces in the thickness direction of the chip is brought into contact with the bottom surface of the chip seat on the bottom surface of the chip seat provided on the tool body, and at least one wall surface standing from the bottom surface of the chip seat In a type cutting tool in which at least one side surface sandwiched between the upper and lower surfaces of the tip is brought into contact, and the tip is fixed to the tool body by a mounting screw that engages with a female screw that opens on the bottom surface of the tip seat. In some cases, the wall surface of the chip seat can be moved back and forth with respect to the chip. Conventional examples of this type of cutting tool are illustrated in FIGS. FIG. 8 is an enlarged view of the periphery of the chip seat, and FIGS. 9 and 10 are a CC sectional view and a DD sectional view in FIG. 8, respectively.

As shown in FIGS. 8 to 10, this cutting tool has a bottom surface (2d) and first to third constraining surfaces (2a, 2b, 2c) arranged around the bottom surface (2d). The bottom surface (2d) is in contact with the upper and lower surfaces (4a, 4b) of the tip (4) and the first restraining surface (2a) is in contact with the side surface (4d) facing the rear end side in the tool axis direction of the tip (4). Touch. Further, the second and third constraining surfaces (2b, 2c) are parallel to each other, and the distance between them is set equal to the width of the chip (4) to sandwich the chip (4). Further, a female screw (15) that opens to the bottom surface (2d) is formed on the inner peripheral side of the tool with respect to the tip seat (2). The female screw (15) has a first constraining surface along the diagonal direction of the bottom surface (2d) gradually as its axis (O ₁ ) goes from the opening to the bottom surface (2d) of the female screw (15) toward the back side. It is tilted to approach (2a). The mounting screw (6) having a male screw part (6a) screwed with the female screw (15) and a head part (6b) engaged with the mounting hole (4e) of the chip (4) is provided on the chip (4). The tip (4) is fixed by being inserted through the mounting hole (4e) and engaging the head (6b) of the mounting screw (6) with the tapered surface (4e) of the tip (4).

Behind each chip seat (2) is provided a shake adjusting mechanism (10) for moving the first restraining surface (2a) in the protruding direction of the chip (4). ) Is attached to the adjustment hole (11) formed in the tool body (1), the notch (12) extending from the adjustment hole (11) toward the tip seat (2), and the adjustment hole (11). And an adjusting screw (13). The adjustment hole (11) includes a tapered surface (11a) that gradually decreases in diameter toward the center side in the tool radial direction, and a cylindrical surface (11b) that extends while maintaining the same diameter as the end portion on the small diameter side of the tapered surface (11a). The internal thread part (11c) formed in the front end side of this cylindrical surface (11b). The notch (12) is formed by notching part of the periphery of the tapered surface (11a) of the adjustment hole (11), and its bottom surface is flush with the bottom surface (2d) of the tip seat (2). Has been. Further, the end portion of the notch portion (12) on the tip seat (2) side is drawn out toward the first restraining surface (2a) to form a gap portion (12a), thereby the first restraining surface (2a). ) And the adjustment hole (11), a thin deformed portion (14) appears. Further, the adjustment screw (13) is screwed into the female screw portion (11c) of the adjustment hole (11), whereby the head portion (13a) is crimped to the tapered surface (11a), and this pressure causes the notch portion (12) to cut. The adjustment hole (11) that is lacked is pushed wide to displace the deforming portion (14) in the protruding direction. (For example, see Patent Document 1)

Noto 2539836

However, although the above-described conventional cutting tool has a cutting edge deflection adjusting mechanism, the amount by which the first constraining surface is moved in the protruding direction by this adjusting mechanism is not so large as to accommodate the reground tip.

FIG. 11 is an enlarged view of the periphery of the tip seat when the regrinding tip is mounted on another conventional cutting tool that does not have a mechanism for moving the tip in the protruding direction as described above. FIG. 12 is a sectional view taken along line EE in FIG. As shown in FIGS. 11 and 12, the restraint surface (5a) that stands up from the bottom surface (2d) of the tip seat (2) and faces the cutting direction (K) front side of the tool body (1) remains unchanged and stationary. In this cutting tool, the side surface (4c) facing the cutting direction (K) rear side of the tip (4) is in close contact with the restraining surface (5a) in order to firmly fix the tip to the tip seat (). I have to let it. Therefore, the side surface (4c) cannot be reground, and the side surface (4c) facing the cutting direction (K) facing the side surface (4c) can only be reground, and the number of chip regrinds is restricted. It was causing a rise in costs. In the throw-away cutting tool of the staggered blade type in which the left blade tip and the right blade tip made of the same shape tip (4) are symmetrically arranged on the left and right side surfaces of the tool body (1), the tip (4 ), The management of the chip (4) is complicated. Moreover, if a dedicated tool body (1) provided with a tip seat (2) corresponding to the regrind allowance (S) and the number of regrinds is prepared, the restriction on the number of regrinds of the tip (4) can be improved. However, there was a problem that the tool cost of the tool body (1) increased.

The present invention has been made in view of the above-described problems, and an object of the present invention is to increase the tip re-grinding allowance or the number of re-grinding in a throw-away cutting tool of the type in which the tip is screwed to the tool body. It is to provide a throw-away type cutting tool that can effectively utilize the tool and suppress the increase in tool cost.

In order to solve the above-described problems, the present invention provides a tool seat having a tip seat, and a polygon plate-shaped throw-away tip on one of the upper and lower surfaces facing the thickness direction of the tip seat. A side surface that intersects at least one of the side surfaces sandwiched between the upper and lower surfaces and faces the rear side in the cutting direction against a constraining surface that rises in a direction intersecting the bottom surface of the tip seat. Further, in the throw-away cutting tool in which the throw-away tip is fixed to the tool body by a mounting screw that is screwed with a female screw that opens to the bottom surface of the tip seat, the side surface facing the rear side in the cutting direction is , Abutting against a flat restraining surface provided on a restraining member that is adjacent to the side surface and is detachably mounted on the tool body, and the restraining member is on the side of the throw-away tip The throwing surface is characterized in that the restraining surface of the restraining member is advanced toward the throw-away tip by the amount (S) of regrinding so as to keep the contact with the side surface when reground. It is an away type cutting tool.

According to the above-described invention, the tip whose side facing the front and rear in the cutting direction is reground is brought into contact with the restraining surface of the restraining member, and firmly and accurately fixed to the tip seat in the same manner as the tip before regrinding. can do. The amount of advancement of the restraining surface of the restraining member can be changed so as to keep contact with the side surface of the chip, and the above-described effect can be obtained even when the regrind amount (S) or the number of regrinds of the chip changes. Is obtained. Further, in the tool main body, since one tool main body is also used regardless of the re-grinding amount (S) of the chip and the number of re-grinding, it is possible to suppress an increase in tool cost. In the tip, both opposing side surfaces can be reground uniformly, and the tool cost is improved by increasing the number of times of regrinding.

In the above-described throw-away cutting tool of the present invention, the restraining surface of the restraining member and the wall surface facing the restraining surface have a wedge angle (α), and the restraining member is substantially parallel to the facing wall surface. By moving along the wall surface of the tool body formed so as to come into contact, and by extending the restraint surface toward the side surface side of the throwaway tip, the restraint surface comes into contact with the side surface of the throwaway tip. Is preferable. By doing so, the restraint surface of the restraint member can be appropriately advanced in accordance with the change in the regrind allowance and the number of regrinds of the side surface of the chip. This makes it easy to manage parts while reducing tool costs.

Next, a first embodiment in which the present invention is applied to a gear cutter will be described with reference to FIGS. FIG. 1 is a front view of a main part of the gear cutter. FIG. 2 is a top view of the gear cutter shown in FIG. FIG. 3 is a longitudinal sectional view of the gear cutter shown in FIG. 4 is an enlarged view of the periphery of the chip seat, and FIG. 5 is a cross-sectional view taken along line AA in FIG.

As shown in FIGS. 1 to 3, chip seats (2) are alternately recessed on the left and right side surfaces along the circumferential direction at the outer peripheral edge of the tool body (1) forming the ring shape of the gear cutter. The On the bottom surface (2a) of the tip seat (2) facing the axis (O) direction of the tool body (1), the wall surface (2a) stands up from the bottom surface (2a) and faces the radially outer side of the tool body (1) ( 2b) is formed to intersect. As shown in FIGS. 4 and 5, the mounting groove (3) to which the restraining member (5) is fixed is provided on the back side of the cutting direction (K) of the tool body (1) of each tip seat (2). Connected to the tip seat (2). In the mounting groove (3), a constraining member (5) having a substantially rectangular plate shape faces the bottom surface (3a) of the mounting surface facing the axis (O) of the tool body (1) and radially outward. It mounts so that it may contact | abut to a wall surface (3b) and the wall surface (3c) which faces a cutting direction (K) front. The restraining member (5) is formed with a mounting hole penetrating the upper and lower surfaces (5a, 5b) facing the axis (O).
When the mounting screw (7) that engages with the mounting hole is screwed into a female screw (not shown) that opens to the bottom surface (3a) of the mounting groove (3) and extends inward, the restraining member (5) becomes the mounting groove. (3) is detachably fixed. And the substantially flat restraint surface (5c) is formed in the wall surface which faces the cutting direction (K) front of the said restraint member (5).

The chip (4) has a substantially rectangular plate shape, the lower surface (4b) in the thickness direction is seated on the bottom surface (2a) of the chip seat (2), intersects the lower surface (4b), and the tool body (1 The side surface (4d) facing the inner side in the radial direction is in contact with the wall surface (2b) of the tip seat (2), and further, the side surface (4c) crossing the lower surface (4b) and facing the rear side in the cutting direction (K). It mounts so that it may contact | abut to the restraint surface (5c) of a restraint member (5). The tip (4) is formed with a mounting hole penetrating the upper and lower surfaces (4a, 4b) facing in the direction of the axis (O), and a mounting screw (6) that engages with the mounting hole serves as a tip seat (2). The tip (4) is detachably fixed to the tip seat (2) by being screwed into a female screw (not shown) that opens to the bottom surface (2a) of the lead and extends inward. The internal thread extending inwardly from the bottom surface (2a, 3a) of each of the chip seat (2) and the mounting groove (3) has a cutting direction (rather than the position where the mounting holes of the chip (4) and the restraining member (5) face each other. K) It is slightly shifted rearward and radially inward of the tool body (1). Then, the mounting screws (6, 7) that are screwed into the female screw respectively connect the tip (4) to the bottom surface (2a), the wall surface (2b), and the restraining surface (5a) of the tip seat (2). (5) is firmly pressed and firmly fixed to the bottom surface (3a) and the wall surfaces (3b, 3c) of the mounting groove (3).

The tip (4) fixed to the tip seat (2) of the tool body (1) in this way has a rake face on the side surface (4c) facing the cutting direction (K) front side of the tool body (1). The upper surface (4a) facing outward from the side surface forms a flank, and the intersecting ridge line portion between the side surface (4c) and the upper surface (4a) forms a cutting edge ridge (4A). The cutting edge ridge (4A) is formed into an involute tooth profile of a gear that is processed by a rotation locus around the axis (O) of the tool body (1). The tip (4) has a pair of the above-mentioned cutting edge ridges (4A) facing each other, and can be mounted on either the left side surface or the right side surface of the tool body (1). One chip can be used twice.

As described above, the tip (4) is fixed to the tip seat (2) provided on each of the left and right sides of the tool body (1) and used for gear cutting, and the cutting edge (4A) is worn. To the extent that the damage on the upper surface (4a) connected to the cutting edge ridge (4A) and the pair of side surfaces (4c) facing the cutting direction (K) is completely removed. Is reground. Then, the tip (4) is fixed to the tip seat (2) of the tool body (1) again and subjected to gear cutting. Here, as shown in FIGS. 4 and 5, in the pair of side surfaces (4c2) of the reground tip (4), the distance from the axis (Os) of the mounting screw (6) is different from that before regrinding. Compared with the re-grinding allowance (S), it becomes smaller. On the other hand, the restraining member (5) provided on the rear side in the cutting direction (K) of the tool body (1) of the tip seat (2) has its restraining surface (5a) moved forward in the cutting direction (K). It can be replaced with one protruding by the grinding allowance (S). Then, the side surface (4c2) facing the cutting direction (K) rear side of the regrinding tip comes into contact with the restraining surface (5a) of the restraining member (5), and the tip seat (2). It is firmly fixed to. The restraining member (5) is prepared in various widths (Ws + S) as shown in FIG. 5 according to the re-grinding allowance (S) of the tip (4) fixed to the tip seat (2). Each time the tip (4) is replaced, the restraining member (5) having a predetermined width (Ws + S) is attached to the tool body (1).

The gear cutter according to the first embodiment has the above-described configuration, so that the tip (4) can be replaced by replacing the restraining member (5) according to the re-grinding allowance (S) or the number of times of re-grinding of the tip (4). Can be firmly and accurately fixed to the tool body, and in the tip (4), the number of regrinds can be increased and the tool cost of the tip (4) can be significantly reduced. Further, the tip (4) is subjected to the same re-grinding with respect to the pair of side surfaces (4c) facing the cutting direction (K) of the tool body (1). . For this reason, a staggered blade type throw-away cutting tool can be used for both the left blade tip and the right blade tip, and there is no complication of managing selfishness. In the tool main body (1), since it is not necessary to prepare a tool main body (1) dedicated to the regrinding tip, an increase in tool costs can be suppressed.

Next, Embodiment 2 according to the present invention will be described with reference to FIGS. FIG. 6 is an enlarged view around the chip seat of the gear cutter according to this embodiment. 7 is a cross-sectional view taken along the line BB in FIG.

This embodiment differs from the first embodiment in the form of the restraining member (5) provided on the rear side in the cutting direction (K) of the tool body (1) of the tip seat (2). Since other configurations are substantially the same as those in the first embodiment, description thereof will be omitted, and characteristic portions will be described below. As shown in FIG. 6 and FIG. 7, the restraining member (5) of this embodiment is a restraint that abuts against a pair of side surfaces (4c) facing the cutting direction (K) of the tool body (1) of the tip (4). The surface (5a) and the side surface (5b) that faces the wall surface (2b) of the tip seat (2) and forms a wedge angle (α). The restraining member (5) is moved toward the bottom surface (3a) side of the mounting groove (3) of the tool body (1) along the axis (Ow) by a screw member such as a left-right screw or a hexagon socket head bolt. If it does, the said restraint surface (5a) will advance to the cutting direction (K) front side of this tool main body (1) according to the movement amount. Then, the restraining member (5) can advance the restraining surface (5a) by a predetermined amount forward in the cutting direction (K) according to the chip regrinding allowance (S) and the number of regrinding, It is unnecessary to replace the restraining member (5) with a different one as in the first embodiment.

In addition, as long as the tip (4) is screwed to the tip seat (2), it is not limited to the above-described gear cutting cutter, but is a throwaway type such as a side cutter, a face mill, an end mill, or a rotary tool, or a bite. Applicable to a cutting tool, means for advancing the restraining surface (5a) of the restraining member (5) to the tip side is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention. It is.

It is a principal part front view of the gear cutting cutter which concerns on Example 1 of this invention. It is a top view of the gear cutting cutter shown in FIG. It is a longitudinal cross-sectional view of the gear cutter shown in FIG. It is an enlarged view of the chip seat periphery of the gear cutter shown in FIG. It is AA sectional drawing in FIG. It is an enlarged view of the chip seat periphery of the gear cutter according to Embodiment 2 of the present invention. It is BB sectional drawing in FIG. It is an enlarged view around the chip seat of a conventional cutting tool. It is CC sectional drawing in FIG. It is DD sectional drawing in FIG. It is a chip seat enlarged view of a conventional cutting tool equipped with a regrinding chip. It is EE sectional drawing in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tool body 2 Tip seat 3 Mounting groove 4 Tip 5 Restraining member 6 Mounting screw 7 Mounting screw 8 Chip pocket

Claims (2)

A tip seat is formed on the tool body, and a polygonal plate-shaped throw-away tip abuts one of the upper and lower surfaces facing the thickness direction on the bottom surface of the tip seat and is sandwiched between the upper and lower surfaces. The side surface that intersects at least one of the side surfaces and faces the rear side in the cutting direction is brought into contact with the constraining surface, and the throwaway tip is screwed into the female screw that opens on the bottom surface of the tip seat. In the throw-away cutting tool fixed to the tool body by a screw, the side surface facing the rear side in the cutting direction is a flat surface provided on a restraining member that is adjacent to the side surface and is detachably attached to the tool body. The restraining member is in contact with the side surface of the throwaway tip so that the restraining surface of the restraining member is kept in contact with the side surface when the side surface of the throwaway tip is reground. Indexable cutting tool, characterized in that the amount of cutting (S) was set to be advanced to the cutting insert side. The side of the tool body formed so that the restraining surface of the restraining member and the side wall surface facing the restraining surface have a wedge angle (α), and the restraining member is substantially parallel to and in contact with the facing side wall surface. 2. The restraint surface is brought into contact with the side surface of the throw-away tip by moving along the wall surface, and by extending the restraint surface toward the side surface side of the throw-away tip. The throw-away type cutting tool according to 1.

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