JPS6322002Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) This invention relates to a throw-away grooving chip with a margin for grooving cast parts and the like.

(Prior Art) Conventionally, grooving of cast parts has been carried out using chips made of ultra-high speed steel or cemented carbide, but the roughness of both sides of the groove is very rough, ranging from 6 to 15 μm.
Therefore, in order to finish the surface of the groove machined by the chip into a smooth surface, other finishing tools (polishing tools, polishing tools,
roller) is used. Recently, cermet has been used as a chip material, and when grooving is performed using a cermet chip, the roughness on both sides of the groove can be improved to around 6μ. However, even if this cermet chip is used, it is difficult to stably secure the required surface roughness of 6.3μ on both sides of the machined groove. The reason for this is that the grooving tip 1 has a back taper angle α and a side clearance angle β as shown in FIGS. 7 to 10, so that the contact area between the tip and the groove side surface is small. Therefore, in order to finish the desired surface roughness on both sides of the groove, the aforementioned polishing tools, rollers, etc. are required, which requires a lot of time to finish the groove sides after grooving, which increases the cost accordingly. .

(Problem that the invention aims to solve) This invention is used when grooving a cast article, etc., since both sides of the groove have a small surface roughness, and a polishing tool, roller, etc. is required after processing. The objective of the present invention is to provide a throw-away grooving tip that does not cause grooving.

(Means for Solving the Problems) In order to solve the above problems, this invention has a structure in which a triangular margin having no back taper angle and no side relief angle is provided on both sides of the tip of the cutting edge of the chip. There is.

(Function of the invention) When grooving a cast part using the grooving tip with the above configuration, the triangular margin does not have a back taper angle or a side relief angle, so the function is to polish the side surface of the groove to be machined. This results in the formation of an area with a larger burnishing effect on the machined surface.

(Description of Embodiment) FIGS. 1 to 5 show an embodiment of this invention.
In the figure, triangular cermet margins 3 having no back taper angle and side relief angle are formed on both side surfaces 2a of the cutting edge tip 2 of the throw-away tip 1 by polishing or the like. That is, the dimension a (usually 0.05
-0.3 mm), both side surfaces 2a, 2a are parallel (that is, the back taper angle is zero), and the back taper angle α begins where dimension a ends. Also, in the rear dimension b (in the range of 0.1 to 0.5 mm) from the front end 2c of the cutting edge tip 2, both side surfaces 2a, 2a are parallel (that is, the side clearance angle β is zero), and the side clearance angle β is It begins where dimension b ends.

When grooving a cast part 4 using the throw-away tip with the above configuration, the part of the cutting edge 2 of the tip 1 that first cuts into the cast part 4,
That is, since the margin 3 has a back taper angle α and a side clearance angle β of zero on both sides 2a, 2a, the cutting edge tip 2 has a polishing function on both sides 5a, 5a of the machined groove 5, unlike conventional chips. It forms an area with . Therefore, both side surfaces 5a, 5a of the machined groove 5 are machined with good surface roughness. This is clear when comparing the surface roughness obtained by grooving with a conventional carbide chip, a conventional cermet chip, and the throw-away chip of the present invention, as shown in Figure 6. It fully clears 6.3μ.

(Effects of the invention) Since the throw-away chip of this invention has the above-mentioned configuration, it can greatly improve the surface roughness of the side surface of the groove during grooving, and the area of the cutting edge of the chip that comes into contact with the cast part is smaller than that of the conventional one. Since it is larger, it has the effect that the roughness of the cut surface is not affected much by the cutting conditions.

[Brief explanation of drawings]

FIG. 1 shows a plan view of an embodiment of this invention, FIG. 2 shows a front view, and FIG. 3 shows a side view. Figure 4 is the first
An enlarged view of part A in the figure is shown, and FIG. 5 is a view from B in FIG. FIG. 6 is a comparison diagram of the roughness of the grooved surface of the throw-away chip of this invention and the conventional throw-away chip. Figure 7 is a plan view of a conventional throw-away tip, Figure 8 is a front view,
FIG. 9 each shows a side view. Figure 10 is the 7th
An enlarged view of part A of the figure is shown. 1... Throwaway tip, 2... Cutting blade tip, 2a, 2a... Side surface, 3... Margin.

Claims (1)

[Scope of utility model registration request] A throw-away grooving tip with a margin, characterized in that a triangular margin having no back taper angle or side relief angle is provided on both sides of the tip of the cutting blade.