JPH08300202A - Bite - Google Patents

Abstract

PURPOSE: To give directivity to chips while shortening the chips and to facilitate the treatment of the chips by making a chip breaker a surface retreating from a surface making a specified angle with an end-cutting-edge perpendicular to the upper surface of a bite. CONSTITUTION: A chip breaker 10 of a bite 1 is a surface retreating by 25-30 deg. from a surface making 40-50 deg. of angle with an end-cutting-edge perpendicular to the upper surface 4 of the bite. The intersection line 12 of the chip breaker 10 and cutting face 5 is spaced by about 1.5mm from the tip of the end-cutting- edge to intersect the side 6 of the bite. This intersection line 12, when orthogonally projected on a surface perpendicular to the upper surface of the bite and parallel to the end-cutting-edge 8, makes 10-20 deg. of angle with the upper surface 4 of the bite. Chips becoming about one winding of a spiral of short twisted converging chips are fileted off in the same direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool for groove turning or parting off.

[0002]

2. Description of the Related Art Groove turning is a work for rotating a work to feed a cutting tool to cut a groove, and cut-off turning is a work for cutting a work in the same manner. In the case of groove cutting and parting off turning, it is easy to chatter because the contact width between the cutting edge of the cutting tool and the workpiece is large, and it is considered to be one of the difficult operations in turning.

A general cutting tool used for groove turning or parting off turning will be described with reference to FIGS. 3 to 8.

FIG. 3 is a cutting tool made by polishing the entire surface, (A) is a top view, (B) is a side view on the right side when viewed from the tip side, and (C) is an end view on the tip side. The cutting tool 1 shown in the figure is provided with a front flank 3 at its tip, and a cutting tool side surface 6
Is provided with a lateral flank 7, and a front cutting edge 8 is formed by the front flank 3 and the tool upper surface 4, and a horizontal cutting edge 9 is formed by the tool upper surface 4 and the lateral flank 7. .

In the case of groove turning or parting off turning, the horizontal cutting edge 9 is not normally worked, so that FIG.
As shown in (A), the lateral flank 7 forms a lateral cutting angle 13 of 1 ° to 5 ° with respect to the side surface 6 of the cutting tool, and the lateral cutting edge 9
Is released inside the bite 1. Although the lateral flank surface 7 is provided only on one side surface 6 in the figure, it is of course possible to provide the lateral flank surface 7 on both sides.

As shown in FIG. 3 (B), the front flank 3 is 5 ° to 10 ° with a plane perpendicular to the cutting tool upper surface 4 and parallel to the front cutting edge 8.
The front clearance angle 17 is 0 °, and the front clearance angle 17 is provided to reduce the cutting resistance. Further, the lateral clearance surface 7 forms a lateral clearance angle 14 of 1 ° to 5 ° with a surface vertical to the cutting tool upper surface 4 and the front cutting edge 8 as shown in FIG. 3 (C), and does not contact the workpiece. Is being done.

When the work piece is machined by the lathe with the cutting tool 1, the chips 15 are curled upward, and become spiral as the cutting progresses. After cutting to some extent, the chips 15 are cut. The cut chips 15 are shown in FIG.

FIG. 5 shows the cutting tool shown in FIG. 3 provided with a rake face. (A) is a top view, (B) is a side view on the right side when viewed from the tip side, and (C) is an end face on the tip side. It is a figure. The cutting tool 1 shown in the drawing has a rake surface 5 on the tip side of the cutting tool upper surface 4.
Is provided, a front cutting edge 8 is formed by the front flank 3 and the rake face 5, a horizontal cutting edge 9 is formed by the rake face 5 and the side flank 7, and the ridge face 5 is raised to the bite upper surface 4. The entire chip breaker 10 is formed.

The rake face 5 and the upper face 4 of the cutting tool are 5 ° to 10 °.
It is provided so as to form a rake angle of 16 °. The step between the rake face 5 and the upper surface 4 of the cutting tool becomes the chip breaker 10, and the chip 15 is brought into contact with the chip breaker 10 to cut the chip 1.
The flow of No. 5 is improved and the upward curl is positively generated. As a result, when the work piece is machined by the lathe with the cutting tool 1, as shown in FIG. 6, a spiral having a smaller diameter than the chips 15 shown in FIG. 4 is formed.

When machining a work piece made of a material such as titanium with the cutting tool 1 shown in FIGS. 3 and 5, the curl of the cutting powder 15 is extended and the cutting work piece 15 and the cutting tool 1 are easily clogged. There is also a tool provided with a groove on the cutting tool 1 so that the curl of the tool does not extend. 7A and 7B show a bite provided with a groove, FIG. 7A is a top view, FIG. 7B is a side view on the right side when viewed from the tip surface side, and FIG. 7C is an end view on the tip side. Note that FIG.
The same parts as those in FIG. 5 are assigned the same reference numerals and explanations thereof will be omitted.

Since the cutting tool 1 having a chip breaker having a three-dimensional shape like the groove 18 is difficult to manufacture by polishing, it is usually manufactured by embossing. When a workpiece is machined by a lathe with the cutting tool 1, the cutting powder 15 is curled upward and a force for compressing its width is generated, so that the cutting powder 15 is formed in the groove 18 as shown in FIG. It becomes a narrow spiral with convex portions along it.

[0012]

However, the above-mentioned bytes have the following problems. (1) Since the cutting powder is wound in a long cylinder, it easily clogs between the workpiece and the cutting tool, and the holder that holds the cutting tool is broken, or the cooling performance deteriorates and the front cutting edge of the cutting tool wears hard. Cause. (2) Since there is no direction of the cutting chips, the processing of cutting chips is troublesome, and the cutting tools may be entangled. (3) Therefore, a worker who always monitors is required. (4) Since a sharp cutting edge cannot be obtained with the one manufactured by embossing, the cutting resistance is large, the finished surface becomes rough, and the cooling property is poor. Further, when the workpiece is thin, the workpiece may be deformed.

The present invention was devised to solve the above problems. That is, it is an object of the present invention to provide a bite for cutting or parting which can give directionality to chips and shorten chips to facilitate chip processing, and further can be produced by polishing. .

[0014]

According to the present invention, there is provided a cutting tool for cutting a workpiece, the tip of which has an end face which is a front flank and an upper face which is a rake face. Is a side flank, the front flank and the rake face form a front cutting edge, the rake face and the side flank form a side cutting edge, and the chip breaker that rises from the rake face to the upper surface of the cutting tool In a cutting or parting tool having a groove formed therein, the chip breaker is 25 degrees with respect to a surface perpendicular to the upper surface of the cutting tool and forming 40 ° to 50 ° with the front cutting edge.
There is provided a cutting or parting tool which is characterized by a receding surface of between 35 ° and 35 °.

Further, when the line of intersection between the chip breaker and the rake face is orthographically projected onto a plane perpendicular to the upper surface of the cutting tool and parallel to the front cutting edge, it may form 10 ° to 20 ° with the upper surface of the cutting tool. Further, the front cutting edge may be lowered from the upper surface of the cutting tool by about 0.15 mm.

[0016]

According to the above-described groove cutting or parting cutting tool of the present invention, the chip breaker is set back by 25 ° to 35 ° with respect to the surface perpendicular to the upper surface of the cutting tool and forming 40 ° to 50 ° with the front cutting edge. Since the surface is a surface, the chips are curled upward and sideways at the same time, so that chips having a tapered spiral are generated. The chips come into contact with the chip breaker again, and due to the bending moment, they break with a short tapered spiral.

If the line of intersection between the chip breaker and the rake face is orthographically projected on the plane perpendicular to the upper surface of the cutting tool so as to form an angle of 10 ° to 20 ° with the upper surface of the cutting tool, almost one wrap of cutting chips is formed. Is cut by. Further, if the front cutting edge is lowered from the upper surface 4 of the cutting tool by about 0.15 mm, the cutting chips form one dense winding.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to FIGS. In each figure, the same parts as those in the related art are designated by the same reference numerals, and a duplicate description will be omitted.

1A and 1B are views showing a cutting or parting cutting tool according to the present invention. FIG. 1A is a top view, FIG. 1B is a side view on the right side when viewed from the tip side, and FIG. A side view on the left side as viewed from the side, (D) is an end view on the tip side.

In FIG. 1A, the chip breaker 10 of the cutting tool 1 is perpendicular to the upper surface 4 of the cutting tool and is 45 ° with the front cutting edge.
It is a surface that is set back by 30 ° with respect to the surface that makes up, and the line 12 of intersection between the chip breaker 10 and the rake face 5 intersects the bite side face 6 at a distance of 1.5 mm from the tip of the front cutting edge 8. ing.

In FIG. 1D, the intersecting line 12 forms 15 ° with the cutting tool upper surface 4 when orthogonally projected to a surface perpendicular to the cutting tool upper surface 4 and parallel to the cutting blade upper surface 8. 8
Is 0.15 mm lower than the upper surface 4 of the cutting tool.

The chip breaker 10 has a three-dimensional shape, but since the shape is linear, the entire surface can be polished without embossing, and a sharp cutting edge can be obtained.

The inclination of the chip breaker 10 is shown in FIG.
In (A), the angle is 45 ° to the right in the figure, but it may be increased to the left.

When the workpiece is groove-turned or part-turned with the cutting tool thus constructed, chips are produced as shown in FIG. In FIG. 2, the work piece 20 is rotated from the front side to the back side of the paper. (1) The work piece 20 is cut by the front cutting edge 8, and the generated chips 15 travel straight along with the cutting along the rake face 5 (FIG. 2 (A)). (2) One side of the cutting chips 15 contacts the chip breaker 10, causing an upward curl and a lateral curl at the same time, and curls at an angle of about 45 ° with the cutting direction (FIG. 2 (B)). (3) As the cutting progresses, the cutting chips 15 form one twisted spiral spiral along the chip breaker 10, and one side 21 of the twisted cutting chips 15 is pressed against itself by the chip breaker 10 to move in the cutting direction. A bending moment F is generated (FIG. 2 (C)). (4) When the bending moment F becomes large enough to cut the chips 15, the chips 15 are cut and ejected to the inclined surface side of the chip breaker 10 (FIG. 2).
(D)).

Therefore, the chips 15 form a short twisted tapered spiral, which is almost one turn, and are ejected in the same direction, so that there is no clogging between the workpiece and the cutting tool.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0027]

As described above, according to the cutting tool of the present invention, since the chip breaker is formed obliquely with respect to the front cutting edge, the cutting chips form a short tapered swirl, which may cause a jam between the work and the cutting tool. Absent. Further, since the cutting chips are directional, the processing of the cutting chips is very easy, and there is no possibility of being entangled with the cutting tool. Therefore, there is no need for monitoring personnel,
Unmanned can be achieved. In addition, since the entire surface is manufactured by polishing, it has an excellent effect such as a small cutting resistance and a good finish surface accuracy.

[Brief description of drawings]

FIG. 1 is a view showing a cutting or parting cutting tool according to the present invention.

FIG. 2 is a diagram showing generation of chips according to the embodiment shown in FIG.

FIG. 3 is a diagram showing a conventional cutting tool manufactured by polishing the entire surface.

FIG. 4 is a diagram showing chips produced by the cutting tool shown in FIG. 3;

5 is a view showing a cutting tool provided with a rake face on the cutting tool shown in FIG. 3;

FIG. 6 is a diagram showing chips produced by the cutting tool shown in FIG. 5;

FIG. 7 is a view showing a conventional cutting tool provided with grooves.

FIG. 8 is a view showing chips produced by the cutting tool shown in FIG. 7.

[Explanation of symbols]

 1 bit 3 Front flank 4 Bit top 5 Rake side 6 Bit side 7 Side flank 8 Front cutting edge 9 Side cutting edge 10 Chip breaker 12 Cross line 13 Side cutting angle 14 Side clearance angle 15 Chip 16 Rake angle 17 Front clearance angle 18 Groove 20 Workpiece 21 One side

Claims (3)

[Claims] 1. A cutting tool for cutting a workpiece, the tip of which has an end face as a front flank, an upper face as a rake face, and a side face as a side flank face. A front cutting edge is formed by the flank and the rake face, a horizontal cutting edge is formed by the rake face and the side flank, and a chip breaker that rises from the rake face and reaches the upper surface of the cutting tool is formed. In the cutting tool, the chip breaker is 25 ° to 35 ° with respect to a surface perpendicular to the upper surface of the cutting tool and forming 40 ° to 50 ° with the front cutting edge.
° A cutting or parting tool that has a receding surface. 2. When the line of intersection between the chip breaker and the rake face is orthographically projected onto a plane perpendicular to the upper surface of the cutting tool and parallel to the front cutting edge, the upper surface of the cutting tool forms 10 ° to 20 °.
Bit for cutting or parting cuts. 3. The front cutting edge is approximately 0.1 from the upper surface of the cutting tool.
The cutting tool for cutting or parting according to claim 1 or 2, which is lowered by 5 mm.