JPH0351058Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a throw-away tip used in a milling tool for cutting shoulder walls.

``Prior Art'' A conventional throw-away tip of this type is shown in FIG. 11. This throw-away tip A has an equilateral triangular shape in plan view, with main cutting edges 2 formed on each edge of the rake face 1, and between the two main cutting edges 2, 2. A rounded edge (corner edge) 3 and a auxiliary cutting edge 4 extending in a direction orthogonal to one of the main cutting edges 2 are formed sequentially from one main cutting edge 2 to the other main cutting edge 2. It is something. In addition, instead of the rounded blade 3, there is also one in which a straight blade is used as a corner blade.

FIG. 12 shows a milling tool for cutting a right-angled shoulder wall in which a throw-away tip A having the above structure is detachably attached to the outer periphery of the tip of the tool body K. It is attached with the main cutting edge 2 facing in the same direction as the axis O of the tool body B, and with the auxiliary cutting blade 4 facing in a direction perpendicular to the axis O. This cutting tool cuts the workpiece W with one main cutting edge 2 and one auxiliary cutting edge 4 to form a right-angled shoulder wall Wr consisting of two orthogonal walls Wa and Wb.

"Problems to be solved by the invention" By the way, when cutting the right-angled shoulder wall Wr using the throw-away tip as described above,
There was a problem that the rounded blade 3 wore out early.

That is, the whirl blade 3 has two walls Wa and Wb.
Since the purpose is to cut the intersection Wc,
It tends to wear out earlier than the main cutting edge 2 and the auxiliary cutting edge 4.
In order to prevent this early wear, the radius of curvature of the rounded blade 3 may be increased. However, when the radius of curvature of the rounded blade 3 is increased, the radius of curvature of the intersection Wc becomes correspondingly large, and the intersection Wc becomes an obstacle when other members are assembled to the right shoulder wall Wr. It ends up. In addition, in order to prevent this, the corner part of the member to be assembled to the right-angled shoulder wall Wr has an intersection part Wc.
A large chamfer must be formed so as not to contact the contact points S ₁ and S ₂ between the wall portions Wa and Wb, and this work requires a great deal of effort. For this reason, it was not possible to increase the radius of curvature of the rounded blade 3, and as a result, it was not possible to prevent the rounded blade 3 from premature wear.

``Purpose of the invention'' The present invention was made in view of the above circumstances, and it is possible to prevent the early wear of the corner blade, and in addition, the intersection of the two walls of the shoulder wall formed by cutting is an obstacle to other members. An object of the present invention is to provide a throw-away tip for use in a milling tool for cutting shoulder walls, which can prevent this from occurring.

``Means for Solving the Problems'' In order to achieve the above-mentioned purpose, the present invention provides a main cutting edge of a chip in which a corner edge is formed between each main cutting edge and another adjacent main cutting edge. When viewed in plan from the rake face side, the part that continues to the counterclockwise end of the corner blade is oriented in a direction perpendicular to the main cutting edge.
In this embodiment, a protruding edge is formed that is parallel to the main cutting edge by protruding within a range of 0.5 mm or less, and the ridge line connecting this protruding edge and the main cutting edge is formed at an obtuse angle with the protruding edge. ” Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 10.

FIG. 1 shows an embodiment of the present invention. The throw-away tip B shown in this figure is formed into a flat plate having a substantially equilateral triangle in plan view, and has a main cutting edge 12 on each edge of the rake face 11.
is formed. Any two main cutting edges 12,1
2, from one main cutting edge 12 to the other main cutting edge 1
2, a rounded blade (corner blade) 13 smoothly connected to one main cutting edge 12 in a clockwise direction;
A auxiliary cutting edge 14 is formed that smoothly connects to this rounded edge 13 and extends in a direction perpendicular to one of the main cutting edges 13.

The above configuration is similar to the conventional throw-away tip A, but in this throw-away tip B, the end of the main cutting edge 12 following the rounded edge 13 is moved in the direction away from the auxiliary cutting edge 14, that is, The protruding blade 12a is made to protrude by a predetermined amount X in a direction perpendicular to the main cutting edge 12 and is parallel to the main cutting edge 12. Here, the ridge line connecting the protruding blade 12a and the main cutting edge 12 is formed so that the protruding blade 12a forms an obtuse angle. In addition, the above prescribed amount
is considered to be within the range of 0.5 mm or less.

Figures 2 and 3 show a cutter for cutting a right-angled shoulder wall equipped with a throw-away tip B having the above configuration. It is removably fixed via a wedge R. In this fixed state, the throw-away tip B is arranged with one main cutting edge 12 facing in the same direction as the axis O of the tool body K, and with the minor cutting edge 14 facing in a direction perpendicular to the axis O. Note that the symbol S in the figure is a wedge for fixing the sheet Q.

Therefore, when the right-angled shoulder wall W is cut with the cutter having the above configuration, as shown in FIG. 14, the horizontal wall Wb is cut by cutting the horizontal wall Wb of the vertical wall Wa.
A recess Wd having a depth corresponding to the amount of protrusion of the protruding end 12a is formed at the side end. Accordingly, the contact point P between the rounded portion Wc formed by the rounded blade 13 of the throwaway tip B and the horizontal wall Wb approaches the vertical wall Wa side of the recessed portion Wd. Therefore, when assembling other members to the right-angled shoulder wall W, it is possible to reduce the possibility that the rounded portion Wc becomes a hindrance to the member. In other words, when the position of the contact point P is kept constant, the radius of curvature of the rounded blade 13 for forming the rounded portion Wc can be increased. For example, even if the radius of curvature of the radiused portion of a conventional throw-away chip is limited to 0.4 mm, it can be increased to 0.8 mm according to the throw-away chip A of the present invention.
Therefore, early wear of the rounded blade 13 can be prevented. Further, even if the radius of curvature of the rounded blade 13 is increased, there is no need to form a large chamfer on the corner portion of the member to be assembled to the right-angled shoulder wall W, and therefore the effort required for the chamfer formation work can be reduced.

Furthermore, since the ridge line connecting the protruding blade 12a and the main cutting edge 12 is formed to form an obtuse angle with the protruding blade 12a, a large cutting force is applied to the protruding blade 1.
The strength of 2a can be improved, and chipping during cutting can be prevented.

Note that in order to increase the radius of curvature of the rounded blade 13, the protrusion amount X may be increased, but if it is made too large, the amount of overhang of the protruding blade 12a with respect to the sheet Q will increase and the protruding blade 12a may be damaged. It becomes easier. From this point of view, the amount of protrusion X should be within the range of 0.5 mm or less.

Next, another embodiment of the present invention will be described.
Incidentally, it goes without saying that the same effects as those of the above-mentioned embodiments can also be obtained in the embodiments described below.

The throw-away tip C shown in FIG. 5 is formed by directly connecting the main cutting edge 12 to the rounded cutting edge 13 without forming a sub-cutting edge between the rounded cutting edge 13 and the main cutting edge 12.

The throw-away tip D shown in FIG. 6 has a substantially parallelogram shape in plan view, and has two main cutting edges 12 forming an acute angle, with a protruding edge 12a formed on one of the two main cutting edges 12.

The throw-away tip E shown in FIGS. 7 and 8 has a substantially rectangular shape in plan view, and has a main cutting edge 12 formed on the long side edge, and a main cutting edge 12 formed at one end of the main cutting edge 12. Between the protruding blade 12a and the auxiliary cutting edge 14, there is a protruding blade 12a as a corner blade.
A straight edge 15 that intersects with the auxiliary cutting edge 14 is formed. Further, a mounting hole 16 is formed inside the mounting hole 16 passing through from one side to the other side, and both ends of this mounting hole 16 are tapered portions 16a whose diameter gradually decreases as it goes inward. .

Figures 9 and 10 show a side cutter to which the above-mentioned throw-away tip E is attached. The main cutting edge 12 and the auxiliary cutting edge 14 cut the right-angled shoulder wall Wr.

"Effects of the Invention" As explained above, according to the throw-away tip of the present invention, the main cutting edge is connected to the counterclockwise end of the corner cutting edge when viewed from the rake face side of the main cutting edge. 0.5 in the direction perpendicular to the blade
Since the protruding blade is made to protrude within a range of mm or less and is parallel to this main cutting edge, and the ridge line connecting this protruding blade and the main cutting edge is formed to form an obtuse angle with the protruding blade, To prevent early wear and chipping of a corner blade and a cutting edge part connected thereto, and also to prevent the intersection of two wall parts of a shoulder wall formed by cutting from getting in the way of other members. Effects such as being able to do this can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing one embodiment of the present invention;
3 and 3 show a cutter for cutting a right-angled shoulder wall with the throw-away tip A shown in FIG. 1 attached, FIG. Fig. 2 is a view taken in the direction of the arrow; Fig. 4 is a drawing showing the cutting process using the right-angled shoulder wall cutting cutter shown in Figs. 2 and 3; Fig. 5 is a part showing another embodiment of the present invention. 6 and 7 are respectively plan views showing still other embodiments of the present invention, and FIG. 8 is a side view of the throwaway tip E shown in FIG. 7, and FIGS. 9 and 10. shows the side cutter to which the throw-away tip E shown in FIGS. 7 and 8 is attached, FIG. 9 is a front sectional view with a part thereof omitted, and FIG.
11 is a plan view showing an example of a conventional throw-away tip, and FIG. 12 shows a right-angled shoulder wall cutting cutter to which the throw-away tip shown in FIG. 11 is attached, with some parts omitted. FIG. 13, a partially cutaway front view, is a diagram showing a cutting process using the cutter shown in FIG. 12. 11... rake face, 12... main cutting edge, 12a...
...Protruding blade, 13...Round blade (corner blade), 1
4... Sub-cutting edge, 15... Straight edge (corner edge).

Claims (1)

[Scope of utility model registration request] The shape in plan view is polygonal, a rake face is formed on the upper surface, and main cutting edges are formed on each edge of the rake face, and between each main cutting edge and another adjacent main cutting edge. In a throw-away tip used in a milling tool for shoulder wall cutting in which a corner edge is formed, the main cutting edge is connected to a counterclockwise end of the corner edge when viewed from the rake face side of the main cutting edge. A portion protrudes within a range of 0.5 mm or less in a direction perpendicular to the main cutting edge to form a protruding edge parallel to the main cutting edge, and a ridge line connecting the protruding edge and the main cutting edge. is formed to form an obtuse angle with the protruding blade.