JPH07314205A - Cutting tool for cutting groove - Google Patents

Abstract

PURPOSE:To provide a cutting tool for cutting a groove by which an accurate groove cutting can be carried out by one cutting tool, machinability and durability are improved and noise is decreased. CONSTITUTION:The end of a cutting tool 3 in contact with a work 1 is provided with a cutting edge 3c having a plurality of round protruding lines 4 extending in the direction perpendicular to the direction of its width. Thus, the contact surface with the work 1 is decreased so that macinability is improved. A recessed groove can be cut with small vibration or noise by moving thecutting edge forward while it is moved rightward and leftward. Since there are a plurality of contact points with the work, a cutting efficiency is improved and the right and left inner walls of the recessed groove can be simultaneously cut, and therefore, dimensional accuracy is also improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grooving bite for rotating a hard material such as hardened steel or a roll-shaped work which is difficult to cut to form a concave groove in the work.

[0002]

2. Description of the Related Art Conventionally, when a groove is formed in a roll-shaped work of a high hardness material by cutting, the work is rotated by a lathe and is rotated by an outer diameter cutting tool a as shown in FIG. There are known a method of cutting a groove b to make a groove, and a method of making a groove on a work b using a groove cutting tool c having a large contact surface as shown in FIG.

[0003]

When the outer diameter cutting tool a shown in FIG. 1 is used, there are two types of blades, one for forward feed and the other for reverse feed, in which the shape of the blade is symmetrical in order to cut the inner surface on the left and right of the groove. An outer diameter cutting tool had to be prepared, and there was a drawback that the accuracy of the groove width was poor because the tool was replaced. Further, the grooving tool c as shown in FIG. 2 has a linear cutting surface of 3 to 5 mm at the tip, so that the cutting performance is poor, cutting noise is generated and the tip is damaged, resulting in poor usage efficiency.

It is an object of the present invention to provide a grooving tool which can perform grooving and cutting with high precision with a single cutting tool, and which has good cutting performance and durability and produces less noise.

[0005]

According to the present invention, a cutting blade having a plurality of round protrusions extending in a direction orthogonal to the width direction is provided at the tip of a cutting tool which comes into contact with a work. To achieve the purpose of. The cutting blade can also be configured as a throwaway tip.

[0006]

[Operation] A work made of high hardness material is attached to a lathe and rotated,
To this end, the groove cutting tool of the present invention is advanced, and the concave groove is cut in the work by making the distance between the vertices of the round ridge more than right and left. Since the cutting edge of the bite is formed by a plurality of round protrusions extending in the direction orthogonal to the width direction, the contact surface of the cutting edge with the work is small, the cutting property is good, and the vibration noise is reduced. Since there are a plurality of contact points, it is possible to simultaneously cut at a plurality of points and the cutting efficiency is good, and the inconvenience of using several cutting tools in combination can be eliminated.

[0007]

Embodiments of the present invention will be described with reference to the drawings.
In FIG. 3, reference numeral 1 denotes a roll-shaped work made of a high hardness material or a material having a hard cutting property, and the work 1 is mounted on a lathe 2 and rotated. A groove cutting tool 3 is provided so as to be movable in the front-rear direction and the left-right direction at a position corresponding to a position where a concave groove on the side of the work 1 is to be formed. The cutting blade of the cutting tool 3 is shown in FIG.
As shown in FIG. 5, a round protrusion 4 extending in the width direction and a direction orthogonal to the width direction is provided in a plurality of lines in parallel with the width direction, as shown in FIG. In addition, the holder 3a and the chip-shaped cutting blade 3c fixed to the holder 3a with a presser foot 3b are formed in a throwaway type. The cutting blade 3c is made of, for example, sintered CBN (cubic boron nitride) or a tool material having wear resistance and chipping resistance equivalent thereto. Further, the radius of the round shape of the round ridge 4 is preferably 0.1 to 1.0 mm in order to obtain good machinability, and the upper surface 5 of the cutting blade 3c and the round ridge 4 are preferably formed. The angle formed by is formed at a right angle or about 3 to 5 °. The ridge 4 can be formed by a tool grinder.

When cutting the recessed groove 6 with the cutting tool 3 in the work 1 made of a hard material such as hardened steel, iron-based sintered alloy, heat-resistant alloy, etc., the work 1 is rotated and the cutting tool 3 is rotated with the projection 4. Cutting is performed by advancing toward the work 1 while moving left and right for a length equal to or more than the distance A between them. Specifically, width 15.0mm
A concave groove having a depth of 10.0 mm, for example, two round ridges 4 having a radius of 1 mm, and a distance A between the ridges 4 is 3.0 mm.
When cutting with the bite 3 of the cutting blade, the bite 3 is moved forward and backward while moving 5.0 mm back and forth. At the time of this cutting, since the cutting blade 3c contacts the work 1 only in a small area of the ridge 4 at the tip thereof, it becomes easier to cut, vibration and noise during cutting are reduced, and the contact point with the work 1 is reduced. Since there are a plurality of chips, they act as a plurality of chips to enhance the cutting ability, and it is possible to accurately cut the left and right inner walls of the concave groove 6 with one tool. The number of the round protrusions 4 is arbitrary, and four protrusions can be provided as shown in FIG. 6, for example. Further, the present invention may be applied to a byte other than the throwaway format.

[0009]

As described above, according to the present invention, since a cutting blade having a plurality of round protrusions extending in the width direction at the tip of the cutting tool is provided in the width direction, the cutting blade is The contact surface becomes smaller and the machinability is improved.By moving this to the left and right and advancing it, you can cut the concave groove with small vibration and noise, and because there are multiple contact points with the workpiece, the cutting efficiency is good and the concave Since the left and right inner walls of the groove can be cut at the same time, the dimensional accuracy is improved.

[Brief description of drawings]

FIG. 1 is an explanatory view of a conventional grooving method.

FIG. 2 is an explanatory view of another conventional grooving method.

FIG. 3 is an overall explanatory view of an embodiment of the present invention

FIG. 4 is an enlarged perspective view of a main part of the present invention.

5 is an enlarged perspective view of the cutting tool of FIG.

FIG. 6 is a plan view of an essential part of another embodiment of the present invention.

[Explanation of symbols] 1 Work 3 Groove cutting tool 3
c Cutting blade 4 Round ridge

Claims (2)

[Claims] 1. A cutting tool for cutting a groove, characterized in that a cutting blade having a plurality of round protrusions extending in a direction orthogonal to the width direction is provided at the tip of the cutting tool in contact with the work in the width direction. 2. The groove cutting tool according to claim 1, wherein the cutting blade is a throwaway tip.