JPH0550320A - Manufacture of throwaway tip type cutter - Google Patents

Abstract

PURPOSE:To provide a throwaway tip type cutter which facilities machining of a tool body and dispenses with runout controlling operation. CONSTITUTION:A constrained surface, constraining any movement of a tip in contact with a side face of the tip being attached to a mounting groove 40 of a tool body 31, is formed by pressing it to a wall surface in this mounting groove into plastic deformation. With this constitution, since the constrained surface of the tool body 31 is formed by pressing the wall surface in the mounting groove 40 into plastic deformation, not by metal cutting as in the past, form, size, etc., of all constrained surfaces of an outer circumferential surface of the cutter body 31 can be made up into the same form in an easy manner, therefore any runout controlling operation is not required as in the past, and setting time for the tip can be shortened so sharply, thus since any parts to be so far required for the runout controlling operation is no longer required, the number of part items is extremely reducible and, what is more, machining of the cutter body 31 can be done so easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a throwaway type cutter in which a plurality of cutting edge chips are detachably attached to the outer peripheral portion of a tool body such as a face mill, side cutter or end mill.

[0002]

2. Description of the Related Art Conventionally, a throwaway type face milling cutter shown in FIGS. 12 and 13 is known as a throwaway type cutter of this type.

In the face milling cutter 1 shown in these figures, a plurality of mounting grooves 5 opening on the tip end surface 3 and the outer peripheral surface 4 of the tool body 2 are formed on the outer peripheral portion of the tool body 2 along the tool circumferential direction. The chip mounting seats 6 are formed with a pitch, and the chip mounting seats 6 are formed on one wall surface side in the mounting grooves 5, and these chip mounting seats 6 are
A cemented carbide slow-away chip (hereinafter referred to as a chip) 7 having a substantially square plate shape is seated via a supporter 8, and the chip 7 and the supporter 8 are mounted in the mounting groove 5. Wedge member 9a and supporter fixing wedge 9
It is pressed by b and is detachably attached.

Here, in a cutting tool such as a face milling cutter using a plurality of chips 7 as described above, each chip 7 is attached from the mounting surface 2a which is in close contact with the end surface of the machine spindle (not shown).
It is indispensable to keep the same distance L to the corner cutting edge 7a in order to maintain the processing accuracy, but in reality, since there is a processing error in the chip mounting seat 6, the chip 7, etc., they are simply the same. If the chip 7 is simply attached to the chip mounting seat 6, the distance L will vary considerably.

Therefore, in such a case, it is necessary to perform an operation for adjusting the distance L (hereinafter referred to as a shake adjusting operation) when each chip 7 is mounted. For example, in the above face milling cutter 1, the recess 10 is formed in the supporter. To form the recess 10
The wall surface 10a of the chip 7 and the side surface 7b of the chip 7 are brought into contact with each other to restrain the movement of the chip 7 in the direction of the tool axis O, and the distance S from the wall surface 10a of the recess 10 to the end surface 8a of the supporter 8 is adjusted. Then, the distance L is matched.

However, when performing the shake adjusting work as described above, it is necessary to frequently repeat the attaching / detaching work of the supporter 8 for each chip 7, and therefore all the chips 7 are carried out.
I spent a lot of time to complete wearing the
There is a drawback that work efficiency such as setup change is significantly deteriorated.

Further, since it is necessary to prepare a large number of supporters 8 having different sizes, the number of parts is increased, and as a result, the maintenance and management of the parts is troublesome and the cost required for the parts management is increased. There was also.

Therefore, the present applicants have previously applied for the throwaway type cutter shown in FIGS. 14 to 16. This forms restraint surfaces 16 and 17 in the mounting groove of the tool body 15 so as to face the side surface of the chip 7 facing the other end side of the tool body and restrain the movement of the chip 7 in the tool axial direction. A concave portion 18 that is recessed toward the center side of the tool body 15 is formed on the outer peripheral portion of the tool body 15 located on the other end side of the tool body 15 with respect to the surfaces 16 and 17, and the concave portion 18 is formed in the concave portion 18. Means 2 for pressing the inner wall of the container to spread the concave portion 18
0 is provided. In such a throwaway type cutter, since the position of the constraining surface 16 can be changed by pushing the concave portion 18 wide by the pressing means 20, the shake adjustment work of the chip 7 can be performed. Therefore, a shake adjustment component (supporter) is used. 8) It is not necessary to perform a complicated work such as exchanging 8), and therefore, the chip deflection adjusting work can be performed easily and quickly, and the work efficiency can be greatly improved.

[0009]

However, the above-mentioned 2
In all types of throwaway type cutters, the tool body is formed by cutting, but since the cutting edge of the tool used for this cutting gradually wears as it is cut, the shape and dimensions of the chip mounting seat must be adjusted. It is difficult to form them all the same.

Further, the throwaway type cutter shown in FIGS. 14 to 16 requires the pressing means 20, that is, the female screw 21 is formed on the bottom of the recess 18 formed in the tool body 15, and the female screw 21 is formed. Since the male screw 22 that is screwed into the and the pressing portion 23 that presses the inner wall of the concave portion 18 are required, there is a disadvantage that a great amount of labor is spent on machining the tool body and the number of parts is increased.

Further, although the shake adjusting work is easier than the throwaway type cutter shown in FIGS. 12 and 13,
Basically, the shake adjustment work is required, so it takes much time to mount the chip.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a throw-away type cutter in which the tool body is easily machined and which does not require a shake adjusting operation.

[0013]

In order to achieve the above object, the method for producing a throwaway type cutlery according to the present invention comprises:
The constraining surface that abuts on the side surface of the throwaway chip mounted in the mounting groove of the tool body that is rotated around the axis and constrains the movement of the throwaway chip is pressed against the wall surface in the mounting groove to achieve plasticity. It is characterized by being formed by deforming.

[0014]

In the method of manufacturing the throwaway type cutter of the present invention, the constraining surface of the cutter body is formed by pressing the wall surface in the mounting groove and plastically deforming the cutting surface, not by conventional cutting. The shape, dimensions, etc. of all the constraining surfaces on the outer periphery of the cutter body can be easily formed to be the same, so there is no need to perform shake adjustment work as in the past, and the chip mounting time can be significantly increased. The number of parts can be minimized and the main body of the cutter can be easily processed because the number of parts required for the shake adjustment work is not necessary.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a throwaway type cutter of the present invention will be described below with reference to the drawings. 1 to 6 explain the first embodiment. First, as shown in FIG. 1, a cutter body (tool body) 31 is fixed to the indexing base 30 with a tightening bolt 32. The indexing base 30 has a protrusion 33 protruding upward in the center thereof,
A female screw portion 34 with which the above-mentioned tightening bolt 32 is screwed is formed on this protruding portion 33. The protruding part 33 is the main body 3 of the cutter.
The cutter body 31 is closely fitted into a mounting hole 35 formed at the center of the cutter 1 to position the cutter body 31 in the radial direction. The upper surface 36 of the indexing base 30 is a plane orthogonal to the projecting portion 33, and the base end surface 37 of the cutter body 31.
Are contacted with each other to position the cutter body 31 in the axial direction. The indexing base 30 configured as described above is rotatable about the axis of the protrusion 33, and the rotation angle can be indexed.

The cutter body 31 is disk-shaped, and a plurality of mounting grooves 40, which are open to the tip surface 38 and the outer peripheral surface 39 of the cutter body 31, are formed on the outer peripheral portion of the cutter body 31 at equal pitches along the tool circumferential direction. And a mounting seat 41 to which the seat 41a is mounted is formed on one wall surface side of the mounting groove 40, and a fixing screw 42 for fixing the supporter 41a to the mounting seat 41 is screwed into the mounting seat 41. Female screw 4
3 is formed.

Next, the plate 44 having the same shape as that of the chip 7 to be mounted is placed on the supporter 41a, and the wedge 45 is lightly tightened in the mounting groove 40 with the clamp screw 46, whereby the wedge 45 and the seat 41a. Hold it between. The plate 44 is made of a material having a hardness higher than that of the cutter body 31 (for example, cemented carbide). In addition, this supporter 4
1a and the plate 44 may be attached to the cutter body 31 before the cutter body 31 is attached to the indexing base 30.

Next, as shown in FIG.
4 is pressed downward by the pressing terminal 46 in the axial direction of the cutter body 31. The pressing terminal 46 is a cylindrical portion 49 fixed to the tip surface of a rod 47 of a press machine (not shown) with a screw 48, and a pressing portion 50 formed on the tip surface of the cylindrical portion 49.
It is composed of and. The pressing portion 50 has abutting surfaces 50a, 50a at the tip thereof.
0a and 50a contact two side surfaces of the plate 44.

Then, the rod 47 is moved forward (see FIG. 1).
By moving the plate 44 downward).
The wall surface that intersects with the mounting seat 41 is pressed by the other two side surfaces of. Then, these wall surfaces are plastically deformed to form wall surfaces that follow the side surface shape of the plate 44 as shown in FIGS. 5 and 6, and the side surfaces of the chip 7 are brought into contact with these wall surfaces so that the cutter of the chip 7 is cut. The restraint surfaces 51 and 52 restrain the movement of the main body 31 in the axial direction and the radial direction. These restraint surfaces 5
Expanded portions 53 and 54 due to plastic deformation are formed on both sides of 1, 52. Since these inflated portions 53 and 54 are formed on both sides of the constraining surface and are shaped so as to come into contact with the side surface of the plate 44, the constraining surface 53, 54 is consequently formed.
The area of 54 is increased, and the restraining force of the chip 7 to be mounted is increased.

Next, after retracting the rod 47, the indexing base 30 is rotated by a predetermined amount,
The cutter body 31 is rotated until the plate 44 attached to the next attachment groove 40 is located immediately below the pressing terminal 46.

Then, a step of pressing the plate 44 by the pressing terminal 46, and further rotating the cutter body 31 immediately below the pressing terminal 46 until the next plate 44 is positioned, presses the plate 44. By repeating this step in sequence, the constraining surfaces 51 and 52 are formed in all the mounting grooves 40 of the cutter body 31.

In the step of forming the constraining surfaces 51, 52, all the constraining surfaces 51, 5 can be obtained by quantifying the moving amount of the pressing terminal 46, that is, the moving amount of the plate 44.
2 is formed so as to be uniform, that is, the distance from the axis of the cutter body 31 and the distance from the base end surface 37 of the cutter body 31 are all the same. Plate 4
4 is adjusted by adjusting the plate 44 or the rod 4
This can be easily done by attaching a dial gauge to 7.

However, according to the method for manufacturing the throwaway type cutter, the restraint surface 5 for restraining the movement of the chip is used.
1, 52 are formed by plastic deformation of the wall surface of the mounting groove 40 by pushing of the plate 44, not by cutting as in the prior art, so that all the constraining surfaces 51, 52 can be easily formed to have the same shape and size. can do.

Therefore, the chip 7 is attached to the restraining surfaces 51 and 52.
If the chip 7 is attached by abutting the side faces of the chip 7, the cutting blades of the chip 7 will have the same distance from the axis of the cutter body 31 and the base end face. Therefore, it is necessary to perform the shake adjustment work as in the conventional case. Therefore, the mounting time of the chip 7 can be significantly reduced.

Further, unlike the conventional throwaway type cutter, since many kinds of supporters 8 and pressing means required for the shake adjusting work are not required, the number of parts can be reduced as much as possible. The machining of the cutter body 31 can be easily performed.

In the case of the cutter body 31 having different corner angles (θ °), the restraining surface can be easily formed by inclining the indexing base 30. Further, when the constraining surfaces 51 and 52 have different shapes, the plate 44 and the pressing terminal 46 may be formed for each purpose. Further, in the above embodiment, the constraining surfaces 51 and 52 are formed on the indexing base 3
Although it was configured to process sequentially by indexing by 0,
The number of rods 47 may be increased to form all the constraining surfaces of the cutter body 31 at the same time. Further, the entire front side of the cutter body 31 is covered with a disk-shaped plate, and the pressing terminal 46 is provided on the plate along the circumferential direction.
It may be configured such that the number of the plates is fixed and the central portion of the plate is pressed.

4 to 11 show a second embodiment of the present invention. These figures show an example in which the method of the present invention is applied to the manufacture of a shoulder shaving cutter. The difference from the first embodiment is that the supporter 63 for positioning and restraining the chip to be mounted is used.
The point is to form a constraining surface against which the side surface of the chip abuts.

That is, after the cutter body 61 is mounted on the indexing base 30 in the same manner as the first embodiment, the rod 4
The plate 62 is moved forward by moving 7 forward.
Here, the plate 62 has the same shape (triangular plate shape) as the throwaway chip to be mounted, and is mounted on the supporter 63 and lightly fixed by the wedge 64. The supporter 63 has a bottom surface 63 a and this bottom surface 63 a.
Side surfaces 63b that are substantially orthogonal to a are respectively brought into contact with the wall surfaces 65a and 65b of the mounting groove 65, and the upper surface 63c of the supporter 63 is pressed by the wedge 66 to be mounted and fixed in the mounting groove 65.

When the plate 62 is advanced, its side surface 6
2a presses one side of the supporter 63 to cause plastic deformation,
A restraint surface 66 is formed in this portion, and at the same time,
The side surface 62b of the plate 62 presses the other side surface of the supporter 63 for plastic deformation, and a restraining surface 67 is formed in this portion. As shown in FIGS. 10 and 11, expanded portions 68 and 69 formed by plastic deformation are formed on both sides of the restraint surfaces 66 and 67 by the plastic deformation as in the first embodiment. Increases the area of the constraining surfaces 66 and 67, so that the constraining force of the chip to be mounted is increased. Thereafter, similarly to the first embodiment, after retracting the rod 47, the indexing base 30 is rotated by a predetermined amount, and the constraining surfaces 66, 67 are attached to the supporter 63 mounted in the next mounting groove 65. By repeating the step of forming by pressing plastic deformation, the constraining surfaces 66,
67 is formed.

In the second embodiment, the same effect as that of the first embodiment can be obtained, and the supporter 63 is of course available.
There is an advantage that the parts mounted on the cutter body 61 can be processed with high precision.

Needless to say, the method of the present invention can be applied to the formation of the constraining surfaces of the throwaway side cutters and end mills, in addition to the first and second embodiments.

[0032]

As described above, according to the method of manufacturing the throwaway type cutter of the present invention, the constraining surface of the cutter body is pressed against the wall surface in the mounting groove without being cut by a conventional method, and the plasticity is improved. Since it is formed by being deformed, it is possible to easily form all the constraining surfaces of the outer periphery of the cutter body in the same shape, size, and the like.

Therefore, if the side surface of the chip is brought into contact with the constraining surface and the chip is mounted, the cutting edges of the chip have the same distance from the axis of the cutter body and the base end surface. Therefore, as in the conventional case, It is not necessary to perform the shake adjustment work, and the mounting time of the chip 7 can be significantly reduced.

Further, unlike the conventional throwaway type cutter, since various kinds of supporters and pressing means required for the shake adjusting work are not required, the number of parts can be reduced as much as possible. The cutting tool body can be easily processed.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a manufacturing apparatus showing a state in which a constraining surface is formed in the method for manufacturing a throwaway type cutter according to the first embodiment of the present invention.

FIG. 2 is a view on arrow A in FIG.

FIG. 3 is a view on arrow B in FIG.

FIG. 4 is a view on arrow C in FIG.

5 is an enlarged view of an X circle portion in FIG.

FIG. 6 is an enlarged view of a Y circle portion in FIG.

FIG. 7 is a cross-sectional view of a manufacturing apparatus showing a state in which a constraining surface is formed in the method for manufacturing a throwaway type cutter according to the second embodiment of the present invention.

8 is a view on arrow D in FIG. 7. FIG.

9 is a view on arrow E in FIG. 7. FIG.

10 is an enlarged view of arrow F in FIG. 7. FIG.

11 is an enlarged view taken along arrow G in FIG.

FIG. 12 is a cross-sectional view showing an example of a conventional throw-away type cutter.

FIG. 13 is a bottom view of FIG.

FIG. 14 is a cross-sectional view showing another example of a conventional throw-away type cutter.

FIG. 15 is a bottom view of FIG.

16 is a view on arrow H in FIG.

[Explanation of reference signs] 7 Throw-away chip 31,61 Cutter body (tool body) 40,65 Mounting groove 44,62 Plate 46 Pressing terminal 50 Pressing part 51,52,66,67 Restraining surface 63 Supporter

Claims (1)

[Claims] 1. A mounting groove that opens to one end and the outer periphery of the tool body is formed in an outer peripheral portion of a tool body that is rotated around an axis, and a throw-away chip is detachably mounted in the mounting groove. In a method of manufacturing a throwaway type cutter, a constraining surface that abuts a side surface of a throwaway chip mounted in a mounting groove of the tool body to constrain movement of the throwaway chip is a wall surface in the mounting groove. A method for manufacturing a throwaway type cutter, which comprises forming by pressing and plastically deforming.