JPH0733522U - Throw-away cutter - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent chipping of the cutting edge at the time of inserting and fixing the tip, and to accurately position and fix the tip even if deposits are attached. [Structure] A first base surface 3 and a second base surface 4 for positioning a throw-away tip are formed in a throw-away tip mounting groove 2 of a cutter body 1. The tip 8 at the positioning position is sandwiched between the pressing surface 6 and the seating surface 25a of the wedge member 25, and the region of the pressing surface 6 facing the cutting edge 18a on the rear end side in the chip insertion direction is cut out to form the guide surface 30. To do. Guide surface 3
The zero forms the recessed portion 31 where the cutting edge 18a is located.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a throw-away type cutter in which a throw-away tip is positioned and fixed to a cutter body.

[0002]

[Prior art]

 Generally, in throw-away type cutters, when the throw-away tips are mounted, exchanged, or corner-changed, a plurality of throw-away tips are quickly and precisely attached to the cutter body, and the axial direction of the tips after positioning is adjusted. In order to prevent shake, chips are set with the front of the cutter body as a reference. An example of such a cutter is described in Japanese Patent Publication No. 61-21767. This will be described with reference to a partial front view of the cutter shown in FIG. 7, a partial longitudinal sectional view of the cutter shown in FIG. 8 and a view of the throw-away tip mounting portion shown in FIG.

In the figure, a plurality of throw-away tip mounting grooves 2 are formed at predetermined intervals on the outer periphery of the cutter body 1 in the axial direction (on the front side) in a direction inclined with respect to the axis. (See FIGS. 7 and 8). The groove 2 extends from the outer peripheral side of the rear end toward the inner peripheral side of the tip, and a first base surface 3 for positioning the throw-away tip, and extends from the inner peripheral portion of the tip of the first base surface 3 toward the outer peripheral side of the tip. It has a second base surface 4 for positioning the throw-away tip. Further, the rear end outer peripheral side end portion of the groove 2 along the first base surface 3 opposite to the second base surface 4 is open. Further, the groove 2 has a mounting surface 5 facing the rotation direction of the cutter body 1 and a chip pressing surface 6 facing the mounting surface 5 (see FIGS. 7 and 9).

Then, with respect to the groove 2, the side surface 10 of the plate-shaped throw-away tip 8 facing the main cutting edge 9 is seated on the first base surface 3 and the main cutting edge 9 has a corner sub-cutting. The front side surface 12 that intersects with the blade 11 is seated on the second base surface 4 so that the throw-away tip 8 is positioned. A wedge member 13 having a seating surface 13a of the tip 8 is inserted between the throwaway tip 8 of the groove 2 and the mounting surface 5 as a fixing member of the throwaway tip, and is fixed by a screw 14. On the outer peripheral side of the tip of the cutter body 1, a first pocket 15 is smoothly cut away from the pressing surface 6 of the tip 8 toward the front in the rotation direction of the cutter body 1, and an inner periphery of the first pocket 15. A second pocket 16 is formed by cutting out a side portion.

In such a throw-away type cutter, in the throw-away tip 8, the side surface 12 facing the main cutting edge 9 abuts the first base surface 3, and the sub cutting edge 3 is sandwiched between the main cutting edge 11. Positioning is performed by bringing the side surface 10 that is in contact with the second base surface 4 into contact. Then, the wedge member 13 is tightened with the screw 14, and the throw-away tip 8 is pressed and fixed by the pressing surface 6 at that position.

[0006]

[Problems to be solved by the device]

 By the way, in such a throw-away type cutter, when the throw-away tip 8 is positioned and fixed by being sandwiched between the pressing surface 6 and the seating surface 13a of the wedge member 13, the tip 8 positioned by the second base surface 4 is positioned. The lower part of the cutting edge 18 a forming the ridge of the side surface 18 facing the side surface 12 of the above is pressed against the pressing surface 6. Therefore, there is a defect that the cutting edge 18a may be chipped due to pressure when tightened by the wedge member 13. When the throw-away tip 8 is inserted between the pressing surface 6 and the seating surface 13a of the wedge member 13, the cutting edges forming the ridgelines of the side surface 12 and the side surface 10 come into contact with the corners of the edge of the pressing surface 6. There is a risk of chipping. Further, since the gap between the pressing surface 6 and the wedge member 13 is relatively narrow, it is difficult to insert the throw-away tip 8. Therefore, if the gap between the two is widened when the chip is inserted, the work and subsequent There is a drawback that the tightening work is troublesome and complicated. In addition, when the corner of the throw-away tip 8 is changed, there is a problem that the deposits adhered to the main cutting edge or the like during the previous cutting may become an obstacle, making it difficult to insert or precisely position the tip. .

In view of such circumstances, the present invention does not have a risk of the cutting edge being chipped when the throw-away tip is attached, and even if the welding material adheres to the cutting edge, it can be inserted by changing the corner. The object is to provide a throw-away type cutter that can be precisely positioned and fixed.

[0008]

[Means for Solving the Problems]

 In the throw-away type cutter according to the present invention, the throw-away tip is inserted and positioned between the pressing surface and the seating surface of the fixing member of the groove formed in the tip outer peripheral portion of the cutter body, and is fixed by the fixing member. In the throw-away type cutter, the rear end side region of the pressing surface facing the cutting edge located on the rear end side in the insertion direction of the throw-away tip is cut out to form a guide surface. It is characterized in that a recessed portion is formed so as not to contact the cutting edge of the throw-away tip.

Further, a base surface for positioning the throw-away tip is provided on the front end side of the groove in the throw-away tip insertion direction.

Further, the guide surface is characterized by being a flat surface, a concave curved surface, or a convex curved surface extending in a direction away from the seating surface of the fixing member.

[0011]

[Action]

 When inserting the throw-away tip between the pressing surface of the groove of the cutter body and the fixing member, the cutting edge located on the tip side in the insertion direction of the tip is guided by the guide surface, and the cutting edge is less likely to be damaged. Since the guide surface is provided, the chip can be easily inserted even if the gap between the pressing surface and the fixing member is relatively small. In addition, when fixing after positioning, the cutting edge located at the rear end in the insertion direction of the throw-away tip is located in the recessed part and does not contact the pressing surface or the guide surface, so it is damaged by the tightening pressure of the fixing member. Don't be afraid, and even if there is a deposit on the used cutting edge when changing corners, this cutting edge is located at the recessed part at the rear end in the chip insertion direction, so that the chip insertion Also, there is no problem in tightening and fixing by the fixing member, and accurate fixing is possible.

[0012]

【Example】

 An embodiment of the present invention will be described below, but the same reference numerals are used for the same members or portions as those in the above-described conventional art, and the description thereof will be omitted. 1 to 5 show an embodiment of the present invention. FIG. 1 is a partial longitudinal sectional view of a cutter body, FIG. 2 is a front view of a main portion of the cutter body, and FIG. 3 is a throw-away tip mounting portion. FIG. 4 is an enlarged view of the throw-away tip mounting portion viewed from a direction different from that of FIG. 3, and FIG. 5 is an enlarged view of the insertion portion in a state where the throw-away tip is corner-changed. In the cutter body 1 shown in FIGS. 1 and 2, the substantially ring-shaped flat surface portion 20 formed on the outer periphery of the tip is located at the tip of the cutter body 1 in the axial direction. A step is formed on the inner side in the radial direction of the front end flat portion 20, and a rear end side flat portion 21 is formed at a position retracted to the rear end side. The front end flat surface portion 20 and the rear end side flat surface portion 21 are divided by a plurality of chip mounting grooves 2 and pockets 22 provided in a distributed manner in the rotation direction of the cutter body 1. A positioning projection 23 is provided from the inner peripheral side inclined surface 21a of the rear end side flat surface portion 21 shown in FIG. 2 toward the same surface as the rear end side flat surface portion 21. The positioning projection 23 is formed by forming the second base surface 4 on the surface from the outer periphery shown in FIG. 1 and is configured to be wide in the circumferential direction.

In the chip mounting groove 2 shown in FIGS. 3 and 4, a portion adjacent to the mounting surface 5 forms a bottom portion 26 on which the wedge member 25 is mounted, and the bottom surface 26 has a pressing surface 6 side. A step is formed and the first base surface 3 is provided. The wedge member 25 has a surface facing the pressing surface 6 that forms a seating surface 25a of the throw-away tip 8, and a guide wall surface 25b that intersects the seating surface 25a at an obtuse angle is formed on the outer peripheral side of the seating surface 25a. ing . A chamfered surface 25c is formed on the ridgeline between the seating surface 25a of the wedge member 25 and the mounting surface of the screw 14 for tightening the wedge member. A first recessed hole 27 is formed along the longitudinal direction of the second base surface 4 in the area of the intersection of the pressing surface 6 and the second base surface 4. The cutting edge 12a of the side surface 12 of the throw-away chip 8 is located in the first recessed hole 27. Further, in the intersection area between the first base surface 3 and the pressing surface 6, the positioning projection 23 shown in FIGS. 2 and 4 is bored from the inner peripheral side inclined surface 21a along the longitudinal direction of the first base surface 3. The formed second recessed hole 28 extends. The cutting edge 10 a of the side surface 10 of the throw-away chip 8 is located in the second recessed hole 28.

The outer peripheral portion of the pressing surface 6 is cut away in the direction away from the mounting surface 5 to form a flat guide surface 30, and a boundary line 30 a between the guide surface 30 and the pressing surface 6 is formed. With the throw-away tip 8 positioned and fixed, the throw-away tip 8 is positioned on the surface 8a (inside the cutting edge 18a) that abuts the pressing surface 6 of the throw-away tip 8. Therefore, the space notched by the guide surface 30 of the pressing surface 6 constitutes the recessed portion 31, and the cutting edge 18a of the side surface 18 at the rear end in the chip insertion direction facing the side surface 12 of the throw-away chip 8 is It will be located in this slime part 31.

Since the present embodiment is configured as described above, when the throw-away tip is attached, the cutter body is provided between the pressing surface 6 of the groove 2 of the cutter body 1 and the seating surface 25a of the wedge member 25. Insert the throw-away tip 8 from the outer peripheral side of 1. At this time, the cutting edge 12a of the side surface 12 is located at the tip in the tip insertion direction and is located on the pressing surface 6 side, but the guide surface 30 and the guide wall surface 25b are located between the pressing surface 6 and the seating surface 25a of the wedge member 25. Since the width is gradually narrowed in the space direction, even if the space is relatively narrow, the guide surface 30 guides the chip 8 so that the chip 8 can be easily inserted. Moreover, even if the cutting edge 12a at the tip of the tip 8 in the insertion direction comes into contact with the guide surface 30 during insertion, the guide surface 30 is inclined, so that the cutting edge 12a is not damaged and is guided in the insertion direction. Get burned.

Next, with the side surface 12 at the distal end in the insertion direction of the throw-away tip 8 positioned on the second base surface 4 and the side surface 10 positioned on the first base surface 3, the wedge member 25 is screwed by the screw 14. When tightened, the throw-away tip 8 is clamped and fixed between the seating surface 25a and the pressing surface 6. At this time, the surface 8a of the throw-away tip 8 is pressed by the boundary line 30a of the pressing surface 6, and the cutting edge 18a located on the outer peripheral side of the tip 8 is located in the recess 31. Therefore, even if the throw-away tip 8 is tightened with the wedge member 25, the cutting edge 18a is not likely to be damaged. Moreover, since the other three cutting edges forming the ridges are also located in the other recessed holes 27, 28, etc., there is no risk of chipping. Further, when the corners of the throw-away tip 8 are changed, the main cutting edge 9 used for the preceding cutting has a welded material p such as a work material attached to the vicinity of the main cutting edge 9 as shown in FIG. However, since the main cutting edge 9 is located in the recessed portion 31 (or the other recessed holes 27, 28) with the corner changed, it can be accurately fixed, and the chip mounting accuracy and the fixing It does not adversely affect the strength.

As described above, according to the present embodiment, there is no risk of the cutting edge 12a located at the tip in the insertion direction when the throw-away tip 8 is attached, and insertion is easy even if the insertion gap is relatively narrow. Therefore, the cutting edge 18a located at the rear end in the chip insertion direction is not damaged during the subsequent fixing. Further, even when the corner is changed after the deposit adheres to the cutting edge 9 by cutting, the deposit does not interfere with the mounting of the chip and can be fixed precisely and firmly.

FIG. 6 shows a modified example of the present invention. In this example, the guide surface 33 formed on the pressing surface 6 is replaced with the flat cutout surface in the above-mentioned embodiment. It is formed in a concave curved surface shape having an R shape in cross section. Alternatively, as shown by the alternate long and short dash line in the figure, it may be formed in a convex curved surface. The guide wall surface 25b of the wedge member 25 does not necessarily have to be provided, and the seating surface 25a may be extended.

[0019]

[Effect of device]

 As described above, in the throw-away type cutter according to the present invention, the rear end side region of the pressing surface facing the cutting edge located on the rear end side in the insertion direction of the throw-away chip is notched to form the guide surface. At the same time, since this guide surface forms a slim part so that it does not come into contact with the cutting edge, there is no risk of the cutting edge positioned at the tip in the insertion direction breaking when inserting the throw-away tip, and the insertion gap is relatively small. Even if it is narrow, the tip can be easily inserted, and the cutting edge located at the rear end in the insertion direction will not be damaged during subsequent tightening and fixing. In addition, even if the welding material adheres to the cutting edge due to cutting and the corner is changed, the welding material does not interfere with the chip mounting and can be accurately positioned and firmly fixed.

[Brief description of drawings]

FIG. 1 is a partial vertical sectional view of a cutter body of a throw-away type cutter according to an embodiment of the present invention.

FIG. 2 is a front view of a main part of the cutter body shown in FIG.

FIG. 3 is an enlarged perspective view of a throw-away tip mounting portion.

FIG. 4 is a partial enlarged view of a throw-away tip mounting portion with respect to a cutter body.

FIG. 5 is an enlarged view of a tip insertion portion in a state where a throw-away tip is corner-changed.

FIG. 6 is a view similar to FIG. 5, showing a modified example of the throw-away type cutter according to the embodiment of the present invention.

FIG. 7 is a partial front view of a conventional throw-away type cutter.

FIG. 8 is a partial vertical cross-sectional view of the throw-away cutter shown in FIG.

FIG. 9 is a partial view of FIG. 7 viewed from a slightly outer peripheral side.

[Explanation of symbols]

 1 Cutter main body 3 1st base surface 4 2nd base surface 6 Pressing surface 8 Throw-away tip 18a Cutting edge 25 Wedge member 25a Seating surface 30 Guide surface 31 Dull part

Claims (3)

[Scope of utility model registration request] 1. A throw-away tip in which a throw-away tip is inserted and positioned between a pressing surface and a seating surface of a fixing member in a groove formed in the outer peripheral portion of the tip of a cutter body, and is fixed by a fixing member. In the type cutter, the rear end side region of the pressing surface facing the cutting edge located on the rear end side in the insertion direction of the throw-away tip forms a guide surface by being cut out, and the guide surface is a throw-away tip. The throw-away type cutter is characterized in that a recessed portion is formed so as not to come into contact with the cutting edge. 2. The throw-away cutter according to claim 1, wherein a base surface for positioning the throw-away tip is provided on the front end side of the groove in the throw-away tip insertion direction. 3. The throw-away cutter according to claim 1, wherein the guide surface is a flat surface, a concave curved surface, or a convex curved surface extending in a direction away from the seating surface of the fixing member. .