JP2869768B2 - Rib cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a while rotating to move the workpiece and substantially parallel to, relates rib cutter for forming a narrow groove in the workpiece.

[0002]

[Its Problems prior art Conventionally, Li Bukatta is the molding surface of the mold for molding and casting such as synthetic resin or die cast metal, to form a rib provided on the product, forms a narrow groove there were.

As a conventional rib cutter, as shown in FIGS. 1 and 2, the cross section of a blade portion 3.8 is made hexagonal or square, and the corner portion is made a cutting edge 4.9.

However, the rib cutter 1 shown in FIG. 1 having a hexagonal cross section of the blade portion 3 has a configuration in which six cutting blades 4 extend from the shank portion 2 side to the bottom blade 5 side of the blade portion 3 to the left.
It was twisted so as to rotate about 80 °.

For this reason, when cutting is performed using substantially the entire length of the blade portion 3 (about 80% of the total length of the blade portion 3), three or more points are always formed on one side surface of the groove being cut. In this case, cutting is performed at a point contact point, there are many points per point, and the cutting edge angle is approximately 120 ° (because of a substantially regular hexagonal cross section, approximately 1 °).
20 °), which inevitably increased the resistance. Further, since the twist of the cutting blade 4 is left-handed and the rotation of the rib cutter 1 at the time of cutting is clockwise rotation when the bottom blade 5 side is viewed from the shank part side 2 of the blade part 3, chips are removed. As a result, the chips are not discharged smoothly, and the resistance of the chips is added. If the groove width is to be cut narrow and deep, the blade 3 of the cutter 1 is broken. It was often damaged.

[0006] In the rib cutter 6 shown in FIG. 2 having a square cross section of the blade portion 8, the bottom blade 10 is cut from the shank portion 7 side.
Side, the cutting blade 9 is a straight blade which is straight, and at the time of cutting, it comes into line contact with one side surface of the groove, so that the resistance increases, and the groove width is narrow, like the rib cutter 1, and When trying to cut a deep groove, the blade 8 of the cutter 6 is often broken and broken.

By the way, in the conventional rib cutters 1.6,
If the groove width is 1 mm, the depth of the cut is 5.6 mm, and if the groove width is 3 mm, the depth is about 25 mm. In this type of narrow groove cutting, instead of cutting all at once, the depth is increased by about 0.03 mm and the blade section 3.8 is gradually increased in length. The cutters were sequentially used to cut in stages. The blades 3 and 8 are frequently damaged during the final stage of cutting.

Further, when forming a deep and narrow groove in a work such as a mold, it is conceivable to use electric discharge machining in addition to cutting. However, in EDM, man-hours such as electrode preparation and surface finishing after machining are required, and the man-hours required to form a predetermined concave groove in a workpiece such as a mold increases as compared with the case of using a rib cutter. In the process of forming a narrow groove in a work such as a mold, which cannot be dealt with quickly, it has been desired to use a directly carved rib cutter which can reduce the number of manufacturing steps.

[0009] The present invention is intended to solve the problems described above, improved durability, and to provide a rib cutter readily cut in deep narrow groove.

[0010]

A rib cutter according to the present invention is a rib cutter used for cutting at the final stage in forming a narrow groove, and has cutting edges at four corners from a shank portion side to a bottom blade side of a blade portion. The blade section has a substantially square cross section so as to be arranged, and is formed into a right-handed twist. The rotation angle of the right-handed twist of each of the cutting blades is set such that the cutting edge is cut with respect to one side surface of the groove having the final shape to be cut. so as to blade per two points and a per point, toward the end cutting edge side from the shank portion of the blade portion, is formed as a substantially 180 °, during cutting, the cutting
The cutting edge to two sides and one point to one side of the groove
And look at the bottom blade side from the shank part side
It is characterized by turning right and cutting .

[0011]

The rib cutter according to the present invention functions and effects of the present invention, when cutting is rotated to move in parallel with the workpiece the groove, to look at the end cutting edge side from the shank portion of the blade portion, rotates in clockwise Meanwhile, it will be cut. At this time, since the cutting edge is twisted right, the chips are smoothly discharged to the shank side, and an increase in cutting resistance due to the chips can be suppressed.

Further, since the cross section of the blade portion of the cutter is substantially square, the gap area between the cutting surface and the cutting surface is larger than that of a conventional case where the cross section of the blade portion is hexagonal. Can be increased, so that an increase in cutting resistance due to chips can be further suppressed.

Furthermore, the rotation angle of twist of the four cutting edges, toward the end cutting edge side from the shank portion, not to one revolution is set to substantially 180 °, <br/> grooves final shape to be cut The cutting edge to two points and one point to one side of
By the, Made up to contact less, also, since also the cutting edge angle smaller as approximately 90 °, cutting resistance is reduced.

[0014] Therefore, in the rib cutter according to the present invention,
By reducing the resistance during cutting, durability can be improved, and even thin and deep grooves will not be damaged,
Can be cut.

[0015] Furthermore, in the rib cutter of the present invention, during cutting, to one side of the groove in the final shape to be cut,
Cutting with less than two points per point and cutting edge angle of about 9
Because it cuts at 0 °, there are many points to hit and the cutting edge angle is about 120 ° (the cross section of the blade is hexagonal). As well as sharp cutting.
Therefore, the surface accuracy of the cut surface can be improved by reducing the vibration during cutting and sharp cutting.

Furthermore, when the bottom edge is made to correspond to the bottom surface of the groove to be cut so as to be a flat surface (including a case where a corner portion is rounded), a tapered surface, or a semicircular surface, the number of cutting edges is four.
Since the number is small, it is easy to deal with and the groove bottom can be cut with an arbitrary surface shape.

[0017]

An embodiment of the present invention will be described below with reference to the drawings.

The cutter 114 of the first embodiment shown in FIGS.
Is a rib cutter for forming a concave groove on a cavity surface of a mold so that a rib can be formed on a product.

The cutter 114 is formed by grinding a cemented carbide as in the case of the conventional rib cutter, and is provided with a shank portion 12 and a blade portion 13.

The cross section of the blade portion 13 is substantially square, and four corners thereof are cutting edges 14. The bottom blade 15 has two blades so that the bottom surface to be cut can be flat.

Each cutting edge 14 of the blade portion 13 is twisted rightward from the shank portion 12 side to the bottom blade 15 side,
The rotation angle α is 180 °.

In addition, the blade portion 13 is, as shown in FIGS.
Groove bottom width 1mm, depth 30mm, draft angle 0 ゜ 3
The shape is used in the fourth stage of the final stage of forming a concave groove having a length of 0 minutes.

Incidentally, the cutter 111 shown in FIGS.
Are used in the first stage, and the cutter 112 shown in FIGS. 8 and 9 is used in the second stage.
The cutter 113 shown in 11 is used in the third stage. And each cutting edge 14 of the blade portion 13 of the cutter 111
However, from the side of the shank portion 12 to the side of the bottom blade 15, as the right-hand twist, the rotation angle α is set to 30 °,
13 from the shank portion 12 side to the bottom blade 15 side, as a right-hand twist, the rotation angle α is 1
80 degrees. In addition, the blade part 13 of the cutter 111
The projected shape at the time of rotation is the same as the projected shape of the blade portion 13 of the cutter 114 at the time of approximately 1/4 rotation on the tip side, and the blade portion 13 of the cutter 112 sets the projected shape at the time of rotation to the blade of the cutter 114. The blade 13 of the cutter 113 has a projection shape at the time of rotation of about 1/2 of the distal end side of the part 13 and the projection shape at the time of rotation of the It is the same as the projected shape at the time of rotation.

[0024] Then, the cutter 111, 112, 113
After using each, using the cutter 114, when cutting a workpiece, the shank portion 12 of the blade section 13
When the bottom blade 15 side is viewed from the side, the cutting is performed while moving in the clockwise direction and moving in parallel with the workpiece. At this time, since each of the cutting blades 14 is twisted rightward, the chips are smoothly discharged to the shank portion 12 side, and an increase in cutting resistance due to the chips can be suppressed.

Further, the cross section of the blade portion 13 of the cut motor 1 14 and as is generally square, as compared to the cross section of a conventional blade portion 3 to the cutter 1, hexagonal, clearance area S between the cutting surface (See FIG. 5), and the amount of stored chips can be increased, so that an increase in cutting resistance due to chips can be further suppressed.

Furthermore, the rotation angle of twist of the four cutting edges 14 alpha is, the shank portion 12 side to the end cutting edge 15 side, not to one rotation, it is 1 80 ° setting, the final shape to be cut Only one point and two points hit against one side surface of the groove, and the cutting resistance is reduced. At the time of cutting, the cutting edge is not used over the entire length of the blade portion 13 but about 80% of the length of the blade portion 13 from the tip (bottom blade 15) is used.

[0027] Therefore, the cut motor 1 14 embodiment, by being able to reduce the resistance during cutting, it is possible to improve the durability, without breaking even in narrow deep trenches can be cut.

Furthermore, during cutting, the vibration at the time of cutting is reduced as compared with the cutter 1 which has a large number of points to be cut, because one side surface of the groove to be cut is cut with two or less points. Can be suppressed. Furthermore, the cutting edge angle (that is, the cutting edge angle) of the cutting edge can be set to approximately 90 °, which is sharper than the case where the cutting edge angle of the cutter 1 having a hexagonal cross section is approximately 120 °. Can be cut into Therefore, by reducing vibration during cutting and sharp cutting,
The surface accuracy of the cut surface can be improved.

The rib cutter 16 shown in FIGS. 12 and 13 has a groove bottom having a width of 2 mm, a depth of 40 mm and a draft of 0 ゜ 30.
This is used in the third stage of the final stage in forming a divided groove. In the cutter 16, the blade 1
8 has a substantially square cross section, and its four corners are cutting edges 19. Further, the bottom blade 20 is configured so that the bottom surface to be cut can be a semi-circular surface.

Each of the cutting blades 19 of the blade section 18 is twisted rightward from the shank section 17 side to the bottom blade 20 side, and has a rotation angle α of 180 °.

When the bottom surface to be cut is a semicircular surface, the bottom blade 20 may be a negative cutting edge having no rake angle as shown in FIGS.

[0032] even at the time of use of the cutter 1 6, cut data 1 1
It has the same function and effect as 4.

[Brief description of the drawings]

FIG. 1 is a front view showing a conventional cutter.

FIG. 2 is a front view showing another conventional cutter.

FIG. 3 is a front view showing one embodiment of the present invention.

FIG. 4 is a plan view of the embodiment.

FIG. 5 is an end view of a portion VV in FIG. 3;

FIG. 6 is a front view showing a rib cutter used first before processing in the embodiment .

FIG. 7 is a plan view of the cutter .

FIG. 8 is a front view of a rib cutter used for processing at a later stage of FIG . 6 ;

FIG. 9 is a plan view of the cutter .

FIG. 10 is a front view of a rib cutter used for processing at a later stage of FIG . 8 ;

FIG. 11 is a plan view of the cutter .

FIG. 12 is a front view of another embodiment.

FIG. 13 is a plan view of the embodiment.

FIG. 14 is a front view showing a state where the bottom blade of the embodiment is changed.

FIG. 15 is a side view of the bottom blade of FIG. 14;

FIG. 16 is a plan view of the bottom blade of FIG. 14;

DESCRIPTION OF SYMBOLS 1, 6, 1 6 - 1 14 ... Ribukatta, 2, 7, 12, 1
7 ... shank part, 3, 8, 13, 18, 23, 28 ... blade part, 4, 9, 14, 19 ... cutting blade, 5, 10, 15, 20
… Bottom blade, α… Rotation angle.

Claims (1)

(57) [Claims] 1. A rib cutter used for cutting at a final stage in forming a narrow groove, wherein a cross section of the blade portion is arranged at four corners from a shank portion side to a bottom blade side of the blade portion. The cutting edge is formed into a substantially square shape and has a right-handed twist, and the rotation angle of the right-handed twist of each of the cutting edges makes the cutting edge per two points and per one point with respect to one side surface of the groove of the final shape to be cut. As described above, the cutting edge is formed at an angle of approximately 180 ° from the shank portion side to the bottom blade side, and the cutting edge corresponds to one side of one side of the groove to be cut at the time of cutting.
From the shank part side
A rib cutter characterized in that it is turned clockwise when viewed from the bottom blade side to cut .