JP7226882B1 - Indexable bevel cutter - Google Patents

Abstract

[Problem] To stabilize the direction of discharge of chips and enable quiet and highly accurate bevel processing. [Solution] The indexable bevel cutter 1 has a radial array of indexable tips 3, 3,... arranged on the outer surface of a cutter body 2 so as to be continuous from the center to the outer periphery. Prepare multiple sets. The indexable tips 3, 3, ... of each tip row 5 are arranged on the outer surface of the cutter body 2 so that the rake angle in the radial direction is positive, and they are arranged in a stepped manner from the center to the outer periphery toward the front in the rotational direction. It is attached. The chip pockets 4, 4, ... arranged on the rake face side of the indexable inserts 3, 3, ... extend from the outer periphery to the center, and the chip pockets located closer to the outer periphery extend closer to the center. A series of chip pocket groups 6, 6, . There is. [Selection diagram] Figure 2

Description

TECHNICAL FIELD The present invention relates to a groove cutter, and more particularly, to a throw-away groove cutter for cutting a groove for welding on a connection end of a rectangular steel pipe (column) for building construction.

Conventionally, as a device for beveling the connecting end of a column for welding, two beveling cutters are installed so as to be movable in the XY directions along the rotation plane of the revolving body that is rotationally driven at a fixed position. , The top end of the column is held in contact with the outer peripheral surface of the column, and the cutting position is defined by the copying roller in contact with the outer peripheral surface of the column. An apparatus designed to perform this has been proposed (Patent Documents 1 and 2).

In addition, as a cutter used for such groove processing, a cemented carbide indexable insert with an arbitrary thickness is fitted and tightened in the insert mounting groove facing the chip pocket on the outer peripheral surface of the truncated cone-shaped cutter body. There is known one that is fixed by tightening with a set screw (Patent Document 3).

Japanese Patent Application Laid-Open No. 2013-13973 (Figs. 6 to 9) JP 2016-64456 A (Fig. 4) Japanese Patent Publication No. 03-073403 (Figs. 1 and 2)

When the groove cutter described in Patent Document 3 is attached to the apparatus described in Patent Documents 1 and 2 and the beveling of the column is performed, as shown in FIG. A phenomenon was observed in which chips C generated during pre-machining hit the device D, rebounded, and returned to the column B side. The returned chips C tend to accumulate on the upper surface of the column B, and are caught in the cutting edge of the chip and the copying roller E, causing chattering vibrations during cutting and adversely affecting the quality of the machined surface. there were.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to stabilize the discharge direction of chips and enable beveling with high noise and accuracy.

The throwaway type bevel cutter of the present invention, which has been made to achieve the above object, has a plurality of throwaway tips and a plurality of A bevel cutter comprising a plurality of radially arranged chip rows in which chip pockets are continuously arranged from the center to the outer circumference, and further comprising the following configuration.
(1A) Each row of inserts is configured by attaching the plurality of indexable inserts to the outer surface of the cutter body so as to form a stepwise arrangement from the center toward the outer periphery toward the front in the rotational direction. to be
(1B) The plurality of chip pockets are arranged on the rake face side of the plurality of indexable inserts, respectively, and the cutter body is arranged so as to form a continuous chip pocket group for each of the chip rows. formed on the outer surface of the
(1C) In the series of chip pocket groups, the plurality of chip pockets constituting the chip pocket group each extend from the outer peripheral side to the center side, and the chip pockets located further on the outer peripheral side It is configured to form a mutually continuous spherical bottom for each of the chip rows, which is communicated with the chip pocket positioned at the center so as to be in a state of being partially entered.

According to the indexable bevel cutter of the present invention, in each of the plurality of sets of radially arranged tip rows, the plurality of indexable tips are arranged stepwise from the center toward the outer circumference toward the front in the rotational direction. The chip pockets arranged on the rake face side of each indexable insert form a continuous chip pocket group for each chip row, and the series of chip pocket groups are: A plurality of chip pockets constituting the chip pocket group extend from the outer peripheral side to the central side, and the chip pockets positioned further on the outer peripheral side partially enter the chip pockets positioned closer to the central side. Since each chip row is connected to each other so as to form a continuous spherical bottom, it is difficult to randomize the discharge direction of the chips, and the chip pocket group is formed. It becomes easy to flow to the front outside of the cutter along. For example, it is possible to reduce the amount of chips bounced off a device in beveling the end of a square steel pipe (column), and to suppress the accumulation of chips on the upper surface of the column. In addition, a series of chip pockets arranged along each chip row are communicated with each other, and a series of chip pockets forming a continuous spherical bottom portion as a whole are provided for each chip row, thereby reducing chipping. Clogging of chips in the chip pocket can also be suppressed. As a result, the indexable bevel cutter of the present invention stabilizes the chip discharge direction and enables bevel processing with high noise and high precision. The throw-away groove cutter of the present invention is not limited to the end of a column (square steel pipe), but can also be used to cut grooves for welding on the edges of H-section steel, flat steel plates, and the like.

Here, the indexable bevel cutter of the present invention can further include the following configuration.
(2) Each of the throwaway inserts is attached to the cutter body so that the rake angle in the radial direction is a positive angle.

According to the indexable bevel cutter having such a configuration, since the rake angle in the radial direction is a positive angle, cutting resistance is reduced, and an effect of suppressing chatter vibration can be expected. In addition, chips are discharged smoothly without being obstructed by the cutting edge, and the action of discharging chips forward and outward while suppressing the flow toward the rear of the cutter can be further enhanced.

This indexable bevel cutter can also have the following configuration.
(3A) Each of the throwaway inserts has a substantially isotropic trapezoidal cross section, and has edges extending in the width direction at both ends of the lower base, which are the long sides of the isotropic trapezoid, as cutting edges. When one edge of both ends of is used as a cutting edge edge, the edge of the cutting edge edge can be attached to and detached from the cutter body via a presser fitting so that the edge of the cutting edge edge forms a cutting edge that matches the groove angle. be attached to the
(3B) In the cutter body, the chip housing groove for housing the indexable chip partially enters the series of chip pockets from the rear side in the rotational direction, and the cutting edge is exchanged for each chip. It is formed so that it can be accommodated in a state in which the cutting edge is configured to match the groove angle and the radial rake angle even in the case where the cutting edge is formed.
(3C) A presser fitting housing groove for storing the presser fitting is provided on the rear side of the tip housing groove in the rotation direction, and the presser fitting housing groove is in a state in which the indexable tip is pressed against the front wall surface of the tip housing groove. It is configured to be able to accommodate the holding metal fittings as much as possible.
(3D) Each of the plurality of sets of radially arranged tip rows has a different radial arrangement of the throwaway inserts between the adjacent tip rows, while the same tip row is reversed outward from the center. The indexable inserts are arranged clockwise and mounted so as to form a continuous cutting range in the radial direction as a whole.

According to the indexable bevel cutter having such a configuration, when the cutting edge wears out, the holding metal can be loosened and the cutting edge of the indexable tip can be changed to continue cutting. At this time, by securely storing the throwaway insert in the insert groove and pressing it against the front wall surface with a pressing metal fitting, the insert is less likely to rattle, and the bevel angle and the radial direction of the rake are reduced. It is easy to implement the mounting with the proper angle of the corners. In each row of inserts, while the arrangement of the throwaway inserts in the radial direction is different between the adjacent row of inserts, the throwaway inserts are arranged counterclockwise outward from the center in the same row of inserts. Since it is installed so as to form a continuous cutting range in the radial direction as a whole, it is possible to stabilize the chip discharge direction and perform beveling appropriately for columns of various diameters. can be done.

In addition, the throw-away bevel cutter of the present invention is particularly attached to the tip of a pair of spindles of an automatic bevel cutting machine that performs bevel processing on the end of the column, and abuts centripetally on the end of the square steel pipe. At the same time, the spindle is driven while maintaining a state in which a profiling roller arranged on the front side coaxially with the spindle is in contact with the outer surface of the square steel pipe, and the pair of grooves in centripetal contact is driven. It may be used in a processing device for cutting a groove for welding by rotating the cutter while taking a point-symmetrical position with respect to the square steel pipe.

By using such an automatic bevel cutting machine, the throw-away bevel cutter of the present invention suppresses random discharge of chips to the rear of the cutter as described above, and moves chips to the front and outside of the cutter. Since it is discharged, it exhibits an effect that chips are less likely to accumulate on the upper surface of the square steel pipe. As a result, the automatic beveling machine of the present invention enables beveling with high noise and precision.

ADVANTAGE OF THE INVENTION According to this invention, the discharge direction of chips can be stabilized, and quiet beveling with high precision can be performed.

The automatic bevel cutting machine of Example 1 is shown, (A) is a longitudinal sectional view, (B) is a front view of the frame part, and (C) is a copy roller and a bevel cutter against the column during bevel processing. FIG. 5 is an explanatory diagram showing changes in contact state; The indexable bevel cutter of Example 1 is shown, (A) is a perspective view, (B) is a front view, and (C) is a bottom view. The throwaway type bevel cutter of Example 1 is shown, (A) is an exploded perspective view of the throwaway tip and its accommodation groove, etc., (B) is a partially enlarged front view, and (C) is partially shown in cross section. It is an explanatory view using two perspective views. FIG. 2 shows an arrangement state of the throwaway tip in the indexable bevel cutter of Example 1, where (A) is a front view and (B) is a partial cross-sectional view. It is a perspective view which shows the indexable bevel cutter of a modification. It is an explanatory view showing a problem of the conventional technology.

Hereinafter, as embodiments of the present invention, specific examples will be described in detail based on the drawings.

First, an example of an automatic groove cutting machine 100 that cuts a groove for welding on the connection end of a square steel pipe for building construction (hereinafter referred to as "column") using the groove cutter of Example 1 will be described. .

As shown in FIGS. 1(A) and 1(B), the automatic bevel cutting machine 100 includes a roller conveyor 110 on which a column W is placed, a frame 120 erected vertically in the intermediate portion of the roller conveyor 110, and a rotating member 130 supported rotatably about a horizontal axis with respect to the frame 120 .

The rotating member 130 is provided with a pair of groove cutters 1, 1 and copying rollers 170, 170. As shown in FIGS. The end of the steel pipe is cut with a throwaway type groove cutter 1 in a state where it is in contact with the column W, and a groove for welding is processed on the entire circumference of the end of the column W.

At this time, the indexable bevel cutters 1, 1 are brought into contact with the ends of the column W centripetally, and as shown in FIG. circulate.

As shown in FIG. 2, the throwaway type groove cutter 1 has a plurality of throwaway tips 3, 3, . . . A plurality of groups of chip rows 5, 5, .

Each row of chips 5, 5, . . . has three or four throwaway chips 3, 3, . It is configured by attaching to the outer surface of the cutter body 2 so as to form a stepwise arrangement.

A plurality of chip pockets 4, 4, . It is formed on the outer surface of the cutter body 2 so as to constitute 6, 6, . Reference numeral 2a in the drawing denotes a cutter attachment/detachment tool attachment hole for attaching a bar-shaped tool when attaching/detaching the indexable bevel cutter 1 to/from the automatic bevel cutting machine 100. FIG.

Each of the series of chip pocket groups 6, 6, . ), the chip pocket located more on the outer peripheral side communicates with the chip pocket located more on the center side so as to be in a state of being partially entered, and the continuous spherical surfaces are formed for each chip row. It is configured to form a shaped bottom.

Further, in the throwaway type bevel cutter 1 of the present embodiment, each throwaway tip 3, 3, . It is attached to the cutter body 2.

Here, as shown in FIG. 3A, each throwaway insert 3 has a cutting edge extending in the width direction at both ends of the lower base that is the long side of the insert body 31 having a substantially isotropic trapezoidal cross section. The bottom surface 31b of the tip body 31 is formed so that when one edge of both ends of the lower base is used as a cutting edge, the edge of the cutting edge forms a cutting edge that matches the groove angle. It is detachably attached to the cutter body 2 by fixing the presser fitting 32 with a screw 33 while being in close contact with the cutter body 2 .

Correspondingly, in the cutter body 2, a chip housing groove 41 for housing the indexable chip 3 partially enters the series of chip pockets 6, 6, . . . Even if the cutting edge of the chip body 31 is replaced, the chip body 31 is formed so that it can be accommodated in a state where the cutting edge is configured to match the groove angle and the rake angle in the radial direction. In addition, a holding metal housing groove 42 for housing a holding metal is provided on the rear side of the tip housing groove 41 in the rotational direction. It is constructed so as to accommodate the pressing metal fitting 32 in the same manner.

In the indexable bevel cutter 1 of this embodiment, as shown in FIG. 4(A), each of the plurality of sets of radially arranged tip rows 5, 5, . While the radial arrangement of the inserts 3 is varied, the indexable inserts are arranged counterclockwise outward from the center in the same row of inserts to form a continuous cutting range in the radial direction as a whole. attached to the More specifically, in the throwaway bevel cutter 1 of this embodiment, in the chip row groups G1, G2, and G3 each having three chip rows as one set, the first row=A, D, G , J, second row=B, E, H, K, and third row=C, F, I. Also, when looking at each group, as shown in FIG. 4(B), A and B, B and C, C and D, . are arranged to have

According to the throwaway type bevel cutter 1 of this embodiment, in each of the plurality of sets of radially arranged tip rows 5, 5, . are mounted so as to form a stepwise arrangement toward the forward side in the rotation direction, and chip pockets 4, 4, . . . A series of chip pocket groups 6, 6, . They extend from the outer peripheral side to the central side, and are communicated so that the chip pocket located more on the outer peripheral side partially enters the chip pocket located more on the central side, and each chip row is connected to each other. Since it is configured to form a continuous spherical bottom portion, it is difficult for chips to be discharged in a random direction, and it is easy for chips to flow along the chip pocket group 6 toward the front and outside of the cutter. As a result, the amount of chips that bounce off the automatic bevel cutting machine 100 can be reduced, and the accumulation of chips on the upper surface of the column W can be suppressed. Also, a series of chip pockets 6 forming a continuous spherical bottom as a whole by connecting a plurality of chip pockets 4, 4, . . . arranged along each chip row 5, 5, . , 6, . As a result, the indexable bevel cutter 1 of the present embodiment enables beveling with high noise and precision.

Further, according to the throwaway type bevel cutter 1 of the present embodiment, the throwaway tips 3, 3, . . . The resistance is reduced, and the effect of suppressing chattering vibration can be expected. In addition, chips are discharged smoothly without being obstructed by the cutting edge, and the action of discharging chips forward and outward while suppressing the flow toward the rear of the cutter can be further enhanced.

Furthermore, the throw-away type bevel cutter 1 of this embodiment has cutting edges extending in the width direction at both ends of the lower base which is the long side of the chip body 31 whose cross section is approximately isotropic trapezoid. When one edge of both ends of the lower base is used as a cutting edge, the edge of the cutting edge forms a cutting edge that matches the groove angle. By fixing the holding metal fitting 32 with a screw 33, it is detachably attached to the cutter body 2. Therefore, when the cutting edge wears out, the holding metal fitting can be loosened and the cutting edge of the indexable insert can be changed. You can continue cutting with At this time, insert the indexable insert firmly into the insert groove.

In addition, in the throwaway type bevel cutter 1 of the present embodiment, the cutter body 2 is provided with the tip accommodation groove 41 for accommodating the throwaway tip 3, which is positioned rearward in the rotational direction with respect to the series of chip pocket groups 6, 6, . The tip is formed so that it can be accommodated in a state in which the cutting edge is configured to match the groove angle and the rake angle in the radial direction even when the cutting edge is replaced in each tip body 31 by partially entering from the side. A presser fitting housing groove 42 for storing a presser fitting is provided on the rear side of the housing groove 41 in the rotation direction, and the presser fitting housing groove 42 is arranged so that the chip body 31 is pressed against the front wall surface of the chip housing groove 41. Since the presser fitting 32 can be accommodated, the tip body 31 can be securely accommodated in the tip accommodation groove 41 and held down by the presser fitting so as to be pressed against the front wall surface, thereby preventing the tip body 31 from rattling. It is difficult to occur, and it is possible to easily carry out attachment with proper groove angle and radial rake angle.

In addition, in the indexable bevel cutter 1 of the present embodiment, each chip row 5, 5, . In , the throwaway inserts are arranged counterclockwise from the center to the outside, and are mounted so as to form a continuous cutting range in the radial direction as a whole, so that the chip discharge direction is stabilized. Grooving can be appropriately performed on columns of various diameters.

The indexable bevel cutter 1 of the present embodiment is attached to the tips of a pair of spindles of an automatic bevel cutting machine 100 for beveling the end of the column W, and is centered on the end of the column W. While keeping the copying rollers 170, 170 arranged on the front side coaxially with the spindle in contact with the outer surface of the column W, the spindle is driven and brought into centripetal contact. By rotating the groove cutters 1, 1 while taking a point-symmetrical position with respect to the column W, the random discharge of chips to the rear of the cutter is suppressed and the chips are discharged to the front and outside of the cutter. As a result, chips are less likely to be accumulated on the upper surface of the column W. As shown in FIG.

Although the embodiments have been described above as the best mode for carrying out the invention, the invention is not limited to these, and various modifications can be made without departing from the scope of the invention.

For example, as shown in FIG. 5, 1B and 1C in which the number of throwaway tips arranged for each tip row is changed does not depart from the gist of the present invention. In addition, when the rotating direction of the cutter is reversed, the positions of the throwaway cutter 3 and the chip pocket 4 in the above-described embodiment may be reversed left and right. In addition, the throw-away type bevel cutter of the present invention can be used not only for the column W but also for beveling various steel materials such as H-shaped steel and flat steel plates. Furthermore, the configuration of the present invention is adopted for the arrangement of the chip row and the chip pocket group in a groove cutter of the type in which the indexable chip is screwed and fixed along the surface of the cutter body without using a presser plate. can also

INDUSTRIAL APPLICABILITY The present invention can be used for groove processing for welding on the ends and edges of various steel materials such as square steel pipes, H-section steel, and flat steel plates.

Reference Signs List 1, 1B, 1C Throwaway bevel cutter, 2 Cutter body, 2a Mounting hole for cutter removal tool, 3 Throwaway tip, 4 Chip pocket, 5 Row of chips 6 Chip pocket group 31 Chip body 32 Presser fitting 33 Screw 41 Chip storage groove 42 Presser fitting storage groove.
G1, G2, G3... chip row group, W... column.

Claims (2)

A row of inserts consisting of a plurality of indexable inserts and a plurality of chip pockets arranged continuously from the center to the outer circumference on the outer surface of a truncated conical cutter body having an inclined surface corresponding to the groove angle. A throw-away type groove cutter characterized by comprising a plurality of sets of groove cutters arranged radially and further comprising the following configuration.
(1A) Each row of inserts is configured by attaching the plurality of indexable inserts to the outer surface of the cutter body so as to form a stepwise arrangement from the center toward the outer periphery toward the front in the rotational direction. to be
(1B) The plurality of chip pockets are arranged on the rake face side of the plurality of indexable inserts, respectively, and the cutter body is arranged so as to form a continuous chip pocket group for each of the chip rows. formed on the outer surface of the
(1C) In the series of chip pocket groups, the plurality of chip pockets constituting the chip pocket group each extend from the outer peripheral side to the central side, and the chip pockets located further on the outer peripheral side It is configured to form a mutually continuous spherical bottom for each of the chip rows, which is communicated with the chip pocket positioned at the center so as to be partially entered .
( 2) Each of the throwaway inserts is attached to the cutter body so that the rake angle in the radial direction is a positive angle. 2. The throwaway bevel cutter according to claim 1 , further comprising the following configuration.
(3A) Each of the throwaway inserts has a substantially isotropic trapezoidal cross section, and has edges extending in the width direction at both ends of the lower base, which are the long sides of the isotropic trapezoid, as cutting edges. When one edge of both ends of is used as a cutting edge edge, the edge of the cutting edge edge can be attached to and detached from the cutter body via a presser fitting so that the edge of the cutting edge edge forms a cutting edge that matches the groove angle. be attached to the
(3B) In the cutter body, the chip housing groove for housing the indexable chip partially enters the series of chip pockets from the rear side in the rotational direction, and the cutting edge is exchanged for each chip. It is formed so that it can be accommodated in a state in which the cutting edge is configured to match the groove angle and the radial rake angle even in the case where the cutting edge is formed.
(3C) A presser fitting housing groove for storing the presser fitting is provided on the rear side of the tip housing groove in the rotation direction, and the presser fitting housing groove is in a state in which the indexable tip is pressed against the front wall surface of the tip housing groove. It is configured to be able to accommodate the holding metal fittings as much as possible.
(3D) Each of the plurality of sets of radially arranged tip rows has a different radial arrangement of the throwaway inserts between the adjacent tip rows, while the same tip row is reversed outward from the center. The indexable inserts are arranged clockwise and mounted so as to form a continuous cutting range in the radial direction as a whole.

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