JP2522181Y2 - Indexable angular cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a throw-away angular cutter for scalloping a steel end face in order to increase the mechanical strength of a weld between steel materials.

(Prior Art) A conventional indexable cutter for scalloping is a plurality of chip pockets and respective chips on an outer peripheral curved surface of a cutter body having a mirror-like shape with a curved surface along an axial center direction from an outer diameter portion. A plurality of cutting edge tip mounting grooves are formed facing the pocket, and a cutting edge having a straight cutting edge is fixed in each of the cutting edge chip mounting grooves with a tightening screw.
A structure in which the plurality of cutting edge tips are arranged in a plurality of rows along the twisting direction on the outer peripheral curved surface of the cutter body has been adopted.

However, if the cutting edge of each cutting edge is straight, as shown in FIGS. 7 and 8, the scallop portion B of the workpiece A becomes a row of cutting edges on the outer peripheral curved surface of the cutter body. Since it is constituted by the same number of combinations of straight lines as the number of combinations of numbers and columns, stress concentration may occur at joints between the straight lines, which may cause breakage.

Therefore, as a countermeasure against stress concentration, improvement has been demanded so that the scallop portion B approximates an ideal scallop curve shape as shown in FIG.

And, for example, Japanese Utility Model Application Laid-Open No. 59-183721 or Japanese Utility Model Application
As described in Japanese Patent Publication No. 0-7919, the cutting edge tip is formed in a substantially triangular shape, and convex arc-shaped cutting edge ridges are formed on three sides of the surface thereof. A throwaway that allows the scallop portion of the workpiece to be machined into a shape that approximates the ideal scallop curve shape by forming a mirror-shaped curved rotation trajectory approximating the ideal scallop curve shape Type angular cutters are known.

(Problems to be Solved by the Invention) However, in the indexable angular cutter described in the above-mentioned publication, the set number of cutting edges in the circumferential direction corresponding to the radial position of the outer peripheral curved surface of the cutter body is determined by the diameter. Regardless of the position, the cutter blades are arranged in equal distribution, that is, for example, three cutting edge tips are arranged in the circumferential direction on both the inner diameter side and the outer diameter side of the outer peripheral curved surface of the cutter main body. The cutting load of the cutting tip located on the outer diameter side of the outer peripheral curved surface of the cutter body is very large compared to the cutting load of the cutting tip located on the inner diameter side of the curved surface, and the cutting load located at the outer diameter position is extremely large. The wear of the blade tip becomes faster, and the outer diameter side cutting edge tip must be replaced earlier, and the replacement time of the cutting edge tip differs between the inner diameter side and the outer diameter side, making the replacement work complicated. Have a problem.

The present invention has been made in view of the above-described problems, and sets a convex arc-shaped cutting edge ridge on each of the front and back sides, and evenly applies a cutting load to each cutting edge chip located on the outer peripheral curved surface of the cutter body. By extending the life of the cutting edge tips arranged on the outer diameter side by giving a balance, it is possible to use one cutting edge tip for a long period of time and to make it economical, and at the same time, the time for replacing the cutting edge tip can be reduced. It is an object of the present invention to provide a throw-away type angular cutter capable of simplifying replacement work by increasing the interval.

(Means for solving the problems) The indexable angular cutter of the present invention is:
An axial center mounting hole 2 is provided at the center of a cutter body 1 having a curved rice cake shape along the axial center direction from the outer diameter portion. A plurality of chip pockets 3 and a plurality of cutting edge chip mounting grooves 4 facing the respective chip pockets 3 are formed, and a cutting edge chip 7 formed in a cylindrical shape in each of the cutting edge chip mounting grooves of the outer diameter portion, A substantially triangular cutting edge chip 5 formed in each of the cutting edge chip mounting grooves 4 of the outer peripheral curved surface is removably tightened and fixed by a tightening screw. In a throw-away type angular cutter for scalloping, which is arranged in a plurality of rows along the twisting direction on the outer peripheral curved surface, the substantially triangular cutting blade tip 5 has a convex arcuate cutting edge 5a of the same shape on each of its front and back surfaces. Form Is for many sequences as the outer diameter side so as to provide a circumferentially uniform cutting load balancing on each cutting edge tip 5 a set number of corresponding to the diameter position of the outer peripheral curved surface of the cutter body 1.

(Operation) The indexable angular cutter of the present invention is:
The convex-arc-shaped cutting edge 5a of a plurality of substantially triangular cutting edges 5 arranged on the outer peripheral curved surface of the cutter body 1 is continuously connected to form a mirror-shaped curved rotation locus approximated to an ideal scalloped curve shape. With this configuration, the scallop portion of the workpiece can be machined into a shape approximating an ideal scallop curve shape.

Then, when the cutting edge 5a of the cutting edge chip 5 that is being processed is consumed, the cutting edge 5a on another surface of the cutting edge chip 5 is processed, and the front and back surfaces of the cutting edge chip 5 are formed. The cutting edge 5a having the same shape can be used.

The substantially triangular cutting blade tips 5 are arranged on the outer peripheral curved surface of the cutter main body 1 by arranging a larger number of set in the circumferential direction according to the radial position of the outer peripheral curved surface of the cutter main body 1 toward the outer diameter side. The same cutting load balance is given to each of the cutting edges 5 to be cut, and the cutting efficiency is improved, and the life of the cutting edges 5 arranged on the outer diameter side is made as long as that of the cutting edges 5 arranged on the inner diameter side. I can do it.

(Embodiment) Hereinafter, the configuration of an embodiment of the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, the cutter body 1 having a curved mirror-like shape along the axial center direction from the outer periphery includes:
An axial center mounting hole 2 is provided at a central portion, and a chip pocket 3 and a substantially triangular cutting blade chip mounting groove 4 are formed on the outer peripheral curved surface so as to face the chip pocket 3.

A cutting edge tip 5 made of a cemented carbide tip having a substantially triangular shape and having an arbitrary thickness is fitted into each cutting edge tip mounting groove 4. It is tightened and fixed by the screw 6 to be screwed.

As shown in FIGS. 3 and 4, this cutting edge chip 5 has the same shape on each of the front and back surfaces, and each cutting edge ridge 5a has a convex arc shape. Is formed by a rake face and a flank of the surface, and the flank is formed on the basis of a mirror-shaped curved rotational trajectory. As a whole, a plurality of rows are arranged along the twisting direction on the outer peripheral curved surface of the cutter body 1, and the respective cutting edge ridges 5 a
Are arranged so as to substantially coincide with an ideal scallop curve shape S (shown in FIG. 5). Also, the cutter body 1
The set number of the cutting edge tips 5 in the circumferential direction according to the radial position of the outer peripheral curved surface of the outer peripheral surface is set so that the cutting load is evenly applied to the respective cutting edge tips 5 arranged on the outer peripheral curved surface of the cutter body 1. It is arranged as many as possible. Specifically, from the outermost diameter side of the cutter body 1, five tip positions a (cutting edge tips 7 described later), five tip positions b, and five tip positions c are provided.
, Three chip positions d, and two chip positions e.
Each cutting edge chip 5 has a mounting hole 5b penetrating on the front and back sides, and also has six cutting edge ridges 5a on both sides. Can use 6 corners.

A plurality of cutting blade tips 7 each having a cylindrical shape are arranged on the end face side outer diameter portion of the cutter body 1 so as to protrude from the end face and the outer peripheral curved surface of the cutter body 1 so as to protrude the cutting edge ridges. The main body 1 is fitted into a cutting edge chip mounting groove 8 provided on an outer diameter portion on the end face side of the main body 1 and is fixedly tightened by a tightening screw 9.

 Next, the operation of the present embodiment will be described.

Since the cutting edge 5a of each cutting edge tip 5 has a convex arc shape, the fifth
As shown in the figure, the cutting edge 5a of the cutting edge tip 5 at each of the tip positions be can substantially match the ideal scallop curve shape S, and the cutting edge at each of these tip positions be Since the tip 5 and the cutting edge tip 7 at the tip position a are continuously joined to form a mirror-shaped curved rotation locus approximated to the ideal scallop curve shape S, as shown in FIG.
The scallop portion B of the workpiece A can be processed into a shape close to the ideal scallop curve shape S.

When the cutting edge 5a of the cutting edge 5 that is being processed is worn out, the cutting edge 5 is replaced so that the processing is performed at the cutting edge 5a of another surface. The same shape of the cutting edge 5a formed on each of the front and back surfaces is used.

Further, since the set number of the cutting blade tips 5 in the circumferential direction according to the radial position of the outer peripheral curved surface of the cutter main body 1 is arranged to be larger toward the outer diameter side, each cutting edge arranged on the outer peripheral curved surface of the cutter main body 1 is arranged. A uniform cutting load balance is given to the insert 5,
The cutting efficiency can be improved, and the life of the cutting edge tips 5, 7 arranged on the outer diameter side can be made as long as that of the cutting edge tip 5 arranged on the inner diameter side. Therefore, the interval of the replacement time of the cutting edge tip 5 on the outer diameter side becomes longer, and the replacement time of the cutting edge tip 5 on the inner diameter side and the outer diameter side becomes substantially the same, so that the replacement work can be performed at once. .

(Effects of the Invention) According to the present invention, a substantially triangular cutting edge tip can use a convex arc-shaped cutting edge ridge of the same shape formed on each of the front and back surfaces thereof, and the cutting edge of the cutter body can be used. The set number of cutting edge tips in the circumferential direction according to the radial position of the outer peripheral curved surface is arranged more toward the outer diameter side, giving an even cutting load balance to each cutting edge chip arranged on the outer peripheral curved surface of the cutter body, and cutting Since it is possible to improve the efficiency and extend the life of the cutting edge tip arranged on the outer diameter side to the same extent as that of the cutting edge tip arranged on the inner diameter side, one cutting edge tip can be used for a long time and is economical. In addition to the above, the interval between the replacement of the cutting edge tips can be extended to simplify the replacement operation.

[Brief description of the drawings]

FIG. 1 is a plan view showing one embodiment of a throw-away type angular cutter of the present invention, FIG. 2 is a side view thereof, and FIG.
FIG. 4 is a plan view of the cutting edge tip, FIG. 4 is a side view thereof, FIG. 5 is an explanatory view showing an ideal scallop curve shape and an outline of each cutting edge tip, and FIG. Side view,
7 and 8 are partial side views of a workpiece by a conventional indexable angular cutter, respectively. 1... Cutter body, 2... Center mounting hole, 3... Chip pocket, 4... Cutting edge chip mounting groove, 5... Approximately triangular cutting edge chip, 5 a... Cutting edge ridge, 6. Screw, 7 ... Cylindrical cutting tip.

Claims (1)

(57) [Scope of request for utility model registration] An axial center mounting hole is provided in a central portion of a cutter body having a mirror-like shape with a curved surface along an axial center direction from an outer diameter portion, and an outer diameter portion and an outer periphery of the cutter body. A plurality of chip pockets are formed on the curved surface and a plurality of cutting edge chip mounting grooves are formed facing each of the chip pockets, and a cutting edge chip formed in a cylindrical shape in each of the cutting edge chip mounting grooves on the outer diameter portion has an outer peripheral surface. The cutting edge tips formed in a substantially triangular shape in each of the cutting edge tip mounting grooves are respectively removably fastened and fixed by tightening screws, and a plurality of substantially triangular cutting edge tips are twisted on the outer peripheral curved surface of the cutter body in a twisting direction. In a throwaway type angular cutter for scallop processing arranged in a plurality of rows along the cutting edge, the substantially triangular cutting edge tip forms a convex arc-shaped cutting edge ridge of the same shape on each of its front and back surfaces, and the cutter -A throw-away angular cutter characterized in that the number of circumferential settings corresponding to the radial position of the outer peripheral curved surface of the main body is increased toward the outer diameter side so as to give an even cutting load balance to each cutting tip. .