JP2602739Y2 - Hard sintered compact throw-away tips - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away chip in which a hard sintered body is brazed to a seat groove formed in a corner of a base metal and the hard sintered body is used as a cutting edge.

[0002]

2. Description of the Related Art A neck SL prior art hard sintered cutting insert, for example, those shown in real No. 5-6 3 707 JP and real Hei 5-60706 Gazette.

The indexable insert disclosed in the former publication is obtained by brazing a composite cutting material having a support as a lower layer and a hard sintered body as an upper layer in a seat groove provided in a corner portion of a base metal. In order to increase the brazing strength, the corner between the seat bottom surface and the upright side surface of the seat groove is curved, and a chamfered portion for increasing the joint area is provided on the brazing side of the composite cutting material.

[0004] On the other hand, the throwaway tip disclosed in the latter publication is provided with a stamping or electrical discharge machining at the intersection of the seat bottom surface of the seat groove of the base metal and the upright side surface, and furthermore, the upright side surface is attached to the same. It is inclined so as to intersect with the seat bottom at an angle of 90 ° or more, and the corresponding surface (rear side surface) of the composite cutting material is also provided with the same inclination.

[0005]

The conventional hard sintered indexable insert described above has a chamfered portion on the brazing side of the composite cutting material for strong brazing, or a cutting edge after the cutting material. Since the side surfaces are inclined, a grinding process or the like is required for this, and there is a problem that the processing cost is increased and the cost is increased.

[0006] Therefore, an object of the present invention is to realize a strong brazing while suppressing an increase in processing cost.

[0007]

In order to solve the above-mentioned problems, in the present invention, a composite cutting material comprising a support and a hard sintered body is brazed into a seat groove at a corner of a base metal. In the above-described hard sintered body throw-away chip, a groove formed by a non-cutting method such as embossing is provided at the intersection of the seat bottom of the seat groove of the base metal and the upstanding side surface by dug-down on the seat bottom side. At the same time, the side surface of the composite cutting edge material is made to cross at right angles to the bottom surface of the cutting edge material (the lower surface of the support) without chamfering the crossing edge. The part along the surface is perpendicular to the seat bottom, the remaining part is the surface whose upper side is inclined away from the hard sintered body, and the lower surface and the rear surface of the support are brazed to the corresponding surface of the seat groove. It was adopted.

[0008]

According to the present invention, since the chamfering process and the angling process of the joining side of the composite cutting blade material are not performed, the time and labor required for additional processing are reduced and the processing cost is reduced.

Further, according to the present invention, since the rear surface of the hard sintered body does not follow the side surface of the seat groove, the brazing strength seems to be reduced at first glance, but the hard sintered body is originally wetted by the brazing material. Poor performance, similar to the fact that this part is not substantially joined, so that the brazing strength is not affected at all, and only the lower surface of the support and the back surface are unchanged The joining strength can be obtained.

[0010] Further, the hard sintered body and the base metal generally have different thermal expansion coefficients. Therefore, a difference in expansion occurs between the two due to the heat of brazing. When the stress remains, there were problems such as cracks in the hard sintered body, but according to the present invention, there is a gap between the rear surface of the hard sintered body and the side surface of the seat groove, and Since there is a groove (slack) at the corner of the seat groove, stress at the time of brazing due to a difference in thermal expansion is alleviated, and a crack does not occur.

[0011]

FIG. 1 shows an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a base metal made of a cemented carbide or the like, and a corner portion thereof is provided with a seat groove including a seat bottom surface 2 and an upright side surface 3. The upstanding side surface 3 of this seat groove is
And a slope 3b having an angle of 90 ° or more with respect to the seat bottom. At the intersection of the seat bottom surface 2 and the upright side surface 3 of the seat groove, a groove (sludge) 4 is provided so as to be dug down at right angles to the seat bottom surface 2. The groove 4 is formed by a non-cutting method such as embossing, electric discharge machining or the like in order to reduce the processing cost.

Reference numeral 5 denotes a composite cutting material in which a support 6 and a hard sintered body 7 are laminated and integrated. The bottom surface 8 and the rear side surface 9 of the composite cutting material 5 intersect at a right angle, and the edge of the intersection is left.

As shown in the figure, when the composite cutting blade material 5 is attached so that the lower surface (that is, the bottom surface 8) and the rear side surface of the support 6 are joined to the seat groove through the brazing material 10, the throw of the present invention is achieved. It becomes an away chip.

As shown in FIGS. 2 to 4, the base metal 1 of this throw-away tip can take any shape such as a quadrangle, a triangle, and a rhombus. Also, as shown in FIG. 4, a plurality of composite cutting blade members 5 can be provided on one base metal.

Next, a more detailed embodiment will be described.

A seat groove having a groove 4 as shown in FIG. 1 was formed in a corner portion of the cemented carbide base metal, and a composite cutting material 5 was brazed to the seat groove. Of the upstanding side surface 3 of the seat groove, the surface 3a perpendicular to the seat bottom 2 has a height of about 1.5 mm corresponding to the thickness of the support 6, and the inclination angle of the slope 3b is the angle formed with the seat bottom 2. Was set to 91 °.

As a result, the processing cost of the chip was reduced by about 15% as compared with the conventional product. Also, unlike the conventional chip in which a crack may occur in the hard sintered body after brazing, no crack was generated in the prototype chip of the example.

Further, by using this prototype chip, HRc
60 quenched SKD11 material, cutting speed 120m /
min, depth of cut 0.5mm, feed 0.2mm / rev
After cutting for 20 minutes, there was no peeling from the brazed part even after cutting for 20 minutes, and it was proved that the composite cutting material had the same joint strength as the conventional product in which the brazing side was chamfered or angle-ground. .

[0020]

[Effects of the Invention] As described above, according to the present invention,
Strong joining of the composite cutting material can be performed without performing additional processing on the composite cutting material including the hard sintered body, and the cost can be reduced by reducing the processing time.

In addition, since residual stress which causes cracks can be reduced, it is also useful for improving product reliability.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a main part of a throw-away tip of the present invention.

FIG. 2 is a perspective view showing an example of the overall shape of the chip according to the first embodiment;

FIG. 3 is a perspective view showing another example of the overall shape.

FIG. 4 is a perspective view showing another example of the overall shape.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base metal 2 Seat bottom 3 Standing side 3a Surface perpendicular to seat bottom 3b Slope 4 Groove 5 Composite cutting material 6 Support 7 Hard sintered body 8 Composite cutting material bottom surface 9 Composite cutting material rear surface 10 Solder Lumber

Claims (1)

(57) [Scope of request for utility model registration] 1. A hard sintered body throw-away tip comprising a support groove on the lower layer and a composite cutting material on a hard sintered body on the upper layer in a seat groove formed in a corner of a base metal. A groove formed by a non-cutting method such as embossing is provided at the intersection of the seat bottom surface and the upright side surface of the seat groove of the base metal by digging down to the seat bottom surface side, and the side surface of the composite cutting edge material is the same as the cutting edge material. At a right angle to the bottom surface of the support (the lower surface of the support) without chamfering the intersecting edge. Further, of the upstanding side surfaces of the seat groove, the portion along which the support extends is a surface perpendicular to the seat bottom, and the remaining portion is A hard sintered body throw-away chip, wherein an upper surface is inclined in a direction away from the hard sintered body, and a lower surface and a rear side surface of the support are brazed to corresponding surfaces of seat grooves.