JP2519691Y2 - Throwaway tip - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of a throwaway tip for thread cutting.

[0002]

2. Description of the Related Art Conventionally, threading throwaway tips shown in FIGS. 4 to 6 have been provided. The throwaway tip shown in these figures has a threading blade portion 3 in which a cutting edge 2 crosses at an angle of approximately 60 ° in plan view at a corner of a tip body 1 having a triangular appearance. Then, the upper surface of the blade portion 3 is used as a rake surface.

[0003]

By the way, in the throwaway tip T as described above, the upper and lower surfaces are subjected to surface grinding after the triangular plate-shaped material is manufactured by sintering, and as shown in FIG. Lateral side grinding is performed using the end surface of the grindstone G ₁ . Then, finally, as shown in FIG. 8, grinding with a blade is performed using a disc-shaped grindstone G ₂ having an acute edge to give a final shape. As described above, in the conventional throwaway tip, since two grinding steps using two types of grindstones are required for attaching the blade, a lot of man-hours are required including installation of the throwaway tip to a grinding device, There is a problem that the manufacturing cost becomes expensive.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and can be manufactured by a small number of grinding steps, and therefore the manufacturing cost can be reduced. The purpose is to provide.

[0005]

The throwaway tip of the present invention is one in which the ridges of the plane of the tip body which are continuous with the ridgeline of the cutting edge of the blade form an angle of less than 60 ° with each other.

[0006]

[Operation] In the throwaway tip having the above configuration,
Since the side surface of the chip body forms an angle smaller than 60 °, it is possible to grind the side surface and then grind the side surface of the blade portion with the same grindstone to carry out blade attachment. Therefore, the blade can be attached by one side grinding, and the number of manufacturing steps can be reduced.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view showing a throwaway tip of an embodiment. In the figure, reference numeral 10 is a chip body, and the chip body 10 is a positive chip in which the upper and lower surfaces are parallel to each other in a diamond shape in plan view, and the upper and side surfaces form an acute angle with each other. The side surface 11 of the chip body 10 forms an angle smaller than 60 °, and the intersecting ridgeline between the side surface and the upper surface forms, for example, 50 °. Then, a blade portion 12 is formed at a corner portion of the chip body 10 on the tip side of the side surface 11. The upper surface of the blade portion 12 is used as a rake surface, and cutting edges 13 are formed on the ridge portion of the rake surface so as to intersect each other at about 60 °. Reference numeral 14 is a mounting hole.

In the throwaway tip having the above-mentioned structure, for example, as shown in FIG. 7, the side surface of the tip body 10 is ground by the end face of the grindstone, and then the tip body 10 is slightly rotated in the X direction, so that Can be ground. The grinding process can be performed by a single process, for example, copy grinding or NC grinding, so that the number of steps is reduced,
The manufacturing cost can be significantly reduced.

In the throwaway tip of the present invention, the tip angle of the cutting edge 13 is 60 °, but it is not necessarily required to be geometrically strict 60 °, and the angle can be substantially used as thread cutting. Good. Further, the shape of the cutting edge is not limited to that of the above-described embodiment, and for example, as shown in FIG.
As shown in FIG. 5, one of the cutting edges 13 may be in a straight line with the rear ridge. Further, it may be a triangular chip or a negative chip.

[0010]

As described above, in the throwaway tip of the present invention, the ridges of the plane of the tip body which are continuous with the ridgeline of the cutting edge of the blade are provided so as to form an angle smaller than 60 ° with each other. The blade can be attached by one side grinding, and the manufacturing cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a throwaway tip of an embodiment.

FIG. 2 is a side view of the throwaway tip shown in FIG.

FIG. 3 is a plan view showing an example in which the blade tip shape of the throwaway tip shown in FIG. 1 is changed.

FIG. 4 is a plan view showing an example of a conventional throw away tip.

5 is a view from the direction of the arrow V in FIG.

6 is a view in the direction of arrow VI in FIG.

FIG. 7 is a side view showing a state in which the side surface of the throwaway tip is being ground.

FIG. 8 is a side view showing a state in which the throw-away tip is being ground with a blade.

[Explanation of symbols]

 10 Chip body 12 Blade 13 Cutting edge

Claims (1)

(57) [Scope of utility model registration request] 1. A throwaway tip in which a cutting blade portion is provided at a corner portion of a chip body having a polygonal shape in plan view and intersects with a cutting edge ridge line forming an angle of approximately 60 ° in plan view. A throwaway tip, characterized in that the ridges of the plane of the tip body which are continuous with the ridgeline are provided so as to form an angle of less than 60 ° with each other.