阅读说明：本技术 金刚石涂层工具 (Diamond coated tool ) 是由 社本英二 于 2020-02-26 设计创作，主要内容包括：在金刚石涂层工具(3)中,工具母材(1)的后刀面(20)包括：第一后刀面(21),其与刀尖(2)相连；第二后刀面(23),其位于与第一后刀面(21)相比远离刀尖(2)的位置,且从工具母材内部观察时位于与第一后刀面相比靠外侧的位置；以及后刀面侧台阶部(22),其连接第一后刀面(21)和第二后刀面(23)。金刚石被覆层(30)形成于第一后刀面(21)和后刀面侧台阶部(22)。(In a diamond coated tool (3), a flank surface (20) of a tool base material (1) comprises: a first flank (21) connected to the nose (2); a second flank surface (23) which is located at a position farther from the cutting edge (2) than the first flank surface (21) and is located at a position further outside than the first flank surface when viewed from the inside of the tool base material; and a flank-side step (22) that connects the first flank surface (21) and the second flank surface (23). A diamond coating layer (30) is formed on the first flank surface (21) and the flank-side step portion (22).)

1. A diamond-coated tool in which diamond is coated on a tool base material having a rake face, a flank face, and a cutting edge which is a boundary between the rake face and the flank face,

the flank face of the tool base material includes: a first relief surface connected to the nose; a second flank surface located farther from the cutting edge than the first flank surface and located further outward than the first flank surface when viewed from inside the tool base material; and a flank side step portion connecting the first flank face and the second flank face,

the diamond coating layer is formed on the cutting edge, the first flank surface, and the flank-side step portion.

2. The diamond coated tool of claim 1,

the rake surface of the tool base material includes: a first rake surface connected to the nose; a second rake surface located farther from the cutting edge than the first rake surface and located further outward than the first rake surface when viewed from inside the tool base material; and a rake face side step portion connecting the first rake face and the second rake face,

the diamond coating layer is formed on the first rake surface and the rake surface side step portion.

3. A diamond-coated tool in which diamond is coated on a tool base material having a rake face, a flank face, and a cutting edge which is a boundary between the rake face and the flank face,

the rake surface of the tool base material includes: a first rake surface connected to the nose; a second rake surface located farther from the cutting edge than the first rake surface and located further outward than the first rake surface when viewed from inside the tool base material; and a rake face side step portion connecting the first rake face and the second rake face,

the diamond coating layer is formed on the first rake surface and the rake surface side step portion, and the rake surface of the diamond coated tool is configured to be flat.

4. The diamond coated tool of claim 3,

the diamond coating layer is not formed on the second rake surface.

5. The diamond coated tool according to any one of claims 1 to 4,

the angle of the knife tip is more than 90 degrees.

Technical Field

The present invention relates to a diamond-coated tool (diamond-coated tool) in which a tool base material is coated with diamond.

Background

In general, a tool obtained by diamond coating a superhard alloy tooth base material is used for cutting a hard material such as ceramics, superhard alloy, or CFRP (carbon fiber reinforced plastics). Cutting of these hard materials may be performed by using a single crystal diamond tool or a polycrystalline diamond tool, but since the cost becomes high, the diamond coated tool has a great advantage in cost.

Patent document 1 discloses a throw-away tip (throw-away tip) in which diamond is coated on a tip base material. In this throwaway insert, a portion near the cutting edge is formed lower by one step than a central portion of the rake face in the rake face of the insert base material so as not to damage the cutting edge of the coating layer when the coated rake face is restricted using a clamping device.

(Prior art document)

(patent document)

Patent document 1: japanese laid-open patent publication No. 6-335806

Disclosure of Invention

(problems to be solved by the invention)

Fig. 1 shows the structure of the tip periphery of a conventional diamond coated tool 50. The diamond coated tool 50 is manufactured by coating diamond on the vicinity of the cutting edge 53 of the superhard tool base material 51, and the diamond coating layer 52 is formed on the cutting edge 53, the rake face 54 and the flank face 55 of the tool base material 51. In fig. 1, the X-axis direction indicates the cutting thickness direction in the cutting step by the diamond coated tool 50, and the Y-axis direction indicates the cutting direction in the cutting step.

In the diamond coated tool 50, the tool base material 51 and the diamond coating layer 52 are not in high adhesion, and when the hardness of the material to be cut is very high or the cutting edge loss progresses to increase the cutting force, there is a problem that the diamond coating layer 52 is easily peeled off from the tool base material 51. In order to solve this problem, measures such as adjusting the composition of the ultrahard alloy (for example, reducing the proportion of Co as a binder) and increasing the roughness of the surface of the base material to produce an anchor effect have been taken, but none of them is sufficient to solve the problem, and there is still a problem of peeling.

The present invention has been made in view of such circumstances, and provides a structure for suppressing the peeling of a diamond coating layer from a tool base material in a diamond coated tool.

(measures taken to solve the problems)

In order to solve the above problems, one aspect of the present invention relates to a diamond coated tool in which diamond is coated on a tool base material having a rake face, a flank face, and a cutting edge which is a boundary between the rake face and the flank face. In the diamond coated tool of this aspect, the flank surface of the tool base material includes: the first rear cutter face is connected with the cutter tip; a second flank surface located farther from the cutting edge than the first flank surface and located further outward than the first flank surface when viewed from inside the tool base material; and a flank side step portion connecting the first flank face and the second flank face. The diamond coating layer is formed on the cutting edge, the first flank surface and the flank step portion.

Another aspect of the present invention relates to a diamond coated tool in which diamond is coated on a tool base material having a rake face, a flank face, and a cutting edge that is a boundary between the rake face and the flank face. In the diamond coated tool of this aspect, the rake face of the tool base material includes: a first rake surface connected with the nose; a second rake surface located farther from the cutting edge than the first rake surface and located further outward than the first rake surface when viewed from inside the tool base material; and a rake face side step portion connecting the first rake face and the second rake face. The diamond coating layer is formed on the first rake face and the rake face side step portion, and the rake face of the diamond coated tool is configured to be flat.

(Effect of the invention)

According to the present invention, a structure for suppressing the peeling of the diamond coating layer from the tool base material in the diamond coated tool can be provided.

Drawings

Fig. 1 is a diagram showing the structure of the periphery of the tip of a conventional diamond coated tool.

Fig. 2 is a diagram showing the shape of the tool base material according to the embodiment.

Fig. 3 is an enlarged cross-sectional view of the flank-side step portion.

Fig. 4 is a diagram showing the structure of a diamond coated tool.

Fig. 5 is a diagram showing another example of the structure of the diamond coated tool.

Fig. 6 is a diagram showing another example of the structure of the diamond coated tool.

Detailed Description

The diamond coated tool of the embodiment will be explained below.

Fig. 2 shows the shape of the tool base material 1 according to the embodiment. The tool base material 1 includes a rake face 10, a flank face 20, and a cutting edge 2 constituting a boundary between the rake face 10 and the flank face 20. The diamond coated tool is manufactured by coating diamond in the vicinity of the cutting edge 2 of the tool base material 1.

The flank surface 20 of the tool base material 1 includes: a first flank 21 connected to the cutting edge 2; a second flank surface 23 located farther from the cutting edge 2 than the first flank surface 21; and a flank-side step portion 22 connecting the first flank surface 21 and the second flank surface 23. The second flank surface 23 is located outside the first flank surface 21 when viewed from the inside of the tool base material 1. In other words, when viewed from the inside of the tool base material 1 in the direction orthogonal to the first flank surface 21 and the second flank surface 23, respectively, the second flank surface 23 is located on the side where the thickness of the tool is increased compared to the first flank surface 21. The first flank surface 21 and the second flank surface 23 may be formed as flat surfaces and may be substantially parallel. For example, the first flank surface 21 and the flank-side step portion 22 may be formed by cutting out a part of the second flank surface 23 that constitutes a flat surface up to the cutting edge.

The rake face 10 of the tool base material 1 includes: a first rake surface 11 connected to the cutting edge 2; a second rake surface 13 located farther from the cutting edge 2 than the first rake surface 11; and a rake face side step portion 12 that connects the first rake face 11 and the second rake face 13. The second rake surface 13 is located outside the first rake surface 11 when viewed from inside the tool base material 1. In other words, when viewed from the inside of the tool base material 1 in the direction orthogonal to the first rake surface 11 and the second rake surface 13, respectively, the second rake surface 13 is located on the side where the thickness of the tool is increased compared to the first rake surface 11. The first rake surface 11 and the second rake surface 13 may be formed as flat surfaces and may be substantially parallel. For example, the first rake surface 11 and the rake surface side step portion 12 may be formed by cutting out a part of the second rake surface 13 constituting a flat surface up to the cutting edge.

Fig. 3 is an enlarged cross-sectional view of the flank-side step portion. As shown in the drawing, a boundary P between the flank side step portion 22 and the first flank 21 and a boundary Q between the flank side step portion 22 and the second flank 23 are defined. The inclined surface of the flank side step portion 22 may be a plane connecting the boundary P and the boundary Q, but may be located further to the back side than the plane connecting the boundary P and the boundary Q when viewed from the outside of the tool base material 1 as shown in fig. 3 (that is, the inclined surface of the flank side step portion 22 may be formed as a concave portion with respect to the plane connecting the boundary P and the boundary Q when viewed from the outside of the tool base material 1).

When R is defined as an intersection point of a virtual plane extending from the first flank surface 21 into the tool base material 1 and a perpendicular drawn from the boundary Q, the distance W between the boundary P and the intersection point R is preferably equal to or less than the distance H between the boundary Q and the intersection point R. That is, in fig. 3, the angle formed by the line segment PR and the line segment PQ is preferably 45 degrees or more. When the inclined surface of the flank-side stepped portion 22 is formed as a concave portion with respect to the plane connecting the boundary P and the boundary Q, the angle formed by the line segment PR and the tangent line of the concave shape on the side closer to the boundary Q is preferably about 90 degrees. Further, it may be: the boundary P is located in the vicinity of the intersection R, the angle formed by the line segment PR and the line segment PQ is about 90 degrees, and the flank-side step portion 22 is formed substantially perpendicular to the wall surface of the first flank 21.

Fig. 3 shows the configuration of the flank side step 22 formed on the flank 20, but the rake side step 12 formed on the rake face 10 may have the same configuration as the flank side step 22 shown in fig. 3.

Fig. 4 shows the structure of a diamond coated tool 3 in which diamond is coated on a tool base material 1. The diamond coating layer 30 is formed on the cutting edge 2, the rake face 10, and the flank face 20 of the tool base material 1. The cutting edge 2 of the tool base material 1 is formed with a cutting edge portion 31 having a radius of a layer thickness. The thickness of the diamond coating layer 30 is preferably not more than the distance H (see fig. 3). In fig. 4, the X-axis direction indicates the cutting thickness direction in the cutting step by the diamond coated tool 3, and the Y-axis direction indicates the cutting direction in the cutting step.

In the flank 20, the diamond coating layer 30 is formed at least on the first flank 21 and the flank-side step portion 22. Here, forming the diamond coating layer 30 on the first flank face 21 and the flank side step portion 22 means that the diamond coating layer 30 is closely attached to the first flank face 21 and the flank side step portion 22.

In the cutting step using the diamond coated tool 3, when the cutting edge portion 31 receives a cutting force from a workpiece, the diamond coating layer 30 formed on the flank surface 20 receives a shear load generated by the cutting force in the extending direction of the first flank surface 21. At this time, the flank side step portion 22 receives a shear load acting on the diamond coating layer 30, and the flank side step portion 22 functions as a peeling suppressing structure for suppressing the shear peeling between the first flank 21 and the diamond coating layer 30.

In the rake face 10, the diamond coating layer 30 is formed at least on the first rake face 11 and the rake face side step portion 12. Here, forming the diamond coating layer 30 on the first rake face 11 and the rake face side step portion 12 means that the diamond coating layer 30 is closely attached to the first rake face 11 and the rake face side step portion 12.

In the cutting process using the diamond coated tool 3, the diamond coating layer 30 formed on the rake face 10 receives a shear load generated by a cutting force in the extending direction of the first rake face 11. At this time, the rake face side step portion 12 receives a shear load acting on the diamond coating layer 30, and thereby functions as a peeling suppressing structure that suppresses shear peeling between the first rake face 11 and the diamond coating layer 30.

In addition, when cutting a work piece having high hardness, due to the problem of the strength of the cutting edge, the work is generally performed using a cutting thickness smaller than the thickness of the coating layer (that is, smaller than the corner radius of the cutting edge in a general coated tool). In this cutting process, the substantial rake angle is determined by the corner radius of the cutting edge and the cutting thickness in many cases, but the diamond coated tool 3 of the embodiment may be configured such that the set rake angle is a negative angle. When the rake angle is set to a positive angle (see fig. 1), the direction of the cutting force applied to the cutting edge portion 31 and the direction in which the rake face 10 extends are close to each other, and therefore the shearing load due to the cutting force increases. On the other hand, if the set rake angle is a negative angle, the included angle between the direction of the cutting force and the extending direction of the rake face 10 becomes large, and thus the shearing load due to the cutting force becomes small. Therefore, in the diamond coated tool 3 of the embodiment, the cutting edge angle (tool angle) of the tool base material 1 is set to 90 degrees or more, and the set rake angle is made negative, whereby the shear load applied between the diamond coated tool 30 and the tool base material 1 in parallel with the rake face 10 is reduced.

In the diamond coated tool 3 of the embodiment, the peeling suppressing structure is provided at least on the flank face 20 side. By providing the peeling suppressing structure on the flank face 20 side, the shear peeling of the diamond coating layer 30 on the flank face 20 can be suppressed. In the case where the peeling suppressing structure is provided only on the flank 20 side, as described above, the diamond coated tool 3 is preferably used so that the set rake angle becomes a negative angle. Further, the peeling suppressing structure may be provided on the rake face 10 side.

Fig. 5 shows another example of the structure of the diamond coated tool 3. The diamond coating layer 30 is formed on the cutting edge 2, the rake face 10, and the flank face 20 of the tool base material 1. In fig. 5, the X-axis direction indicates the cutting thickness direction in the cutting step by the diamond coated tool 3, and the Y-axis direction indicates the cutting direction in the cutting step.

In the flank 20, the diamond coating layer 30 is formed on the first flank 21 and the flank-side step portion 22, but not on the second flank 23. Referring to fig. 4, when diamond is coated on the second flank 23, a convex portion of the diamond coating layer 30 protruding in the cutting thickness direction is formed in the vicinity of the boundary between the flank-side step portion 22 and the second flank 23. Since the convex portion may interfere with the machined surface of the material to be cut, in the diamond coated tool 3 shown in fig. 5, the diamond coating layer 30 is not provided on the second flank surface 23, thereby avoiding the formation of the convex portion.

Therefore, in the manufacturing process of the diamond coated tool 3, a predetermined pretreatment may be performed so that diamond is not coated on the second flank surface 23 before the coating process is performed. As another manufacturing process, after the diamond coating layer 30 is formed on the flank 20 in the coating step, the diamond coating layer 30 formed on the second flank 23 may be removed. In this removal step, the diamond coating layer 30 is removed to such an extent that the diamond coating layer does not interfere with the machined surface of the workpiece, and it is not necessary to remove all of the diamond coating layer 30 formed on the second flank surface 23.

Fig. 6 shows another example of the structure of the diamond coated tool 3. The diamond coating layer 30 is formed on the cutting edge 2, the rake face 10, and the flank face 20 of the tool base material 1. In fig. 6, the X-axis direction indicates the cutting thickness direction in the cutting step by the diamond coated tool 3, and the Y-axis direction indicates the cutting direction in the cutting step.

In the rake face 10, the diamond coating layer 30 is formed on the first rake face 11 and the rake face side step portion 12, but not on the second rake face 13. Referring to fig. 5, when diamond is coated on the second rake surface 13, the diamond coating layer 30 has a shape protruding outward in the vicinity of the rake surface side step portion 12. Since this shape may interfere with chip discharge, in the diamond coated tool 3 shown in fig. 6, the diamond coating layer 30 is not formed on the second rake face 13, but the diamond coating layer 30 is formed in a flat shape with the second rake face 13 in the first rake face 11 and the rake face side step portion 12. The fact that the diamond coating layer 30 and the second rake surface 13 are flat means that the diamond coating layer 30 and the second rake surface 13 are connected to such an extent that the discharge of chips is not hindered, and includes the case of being substantially flat.

In the manufacturing process of the diamond coated tool 3, after the diamond coating layer 30 is formed on the rake face 10, the diamond coating layer 30 may be removed in order to flatten the rake face of the diamond coated tool 3. At this time, all the diamond coating layer 30 formed on the second rake surface 13 may be removed as shown in fig. 6, but since the diamond coating layer 30 is removed in order to form a flat surface that does not interfere with the outflow of chips on the rake surface of the diamond coated tool 3, the diamond coating layer 30 may remain on the second rake surface 13.

The present invention has been described above based on the embodiments. As will be appreciated by those skilled in the art: this embodiment is an example, and various modifications can be made to each member and each combination of processes, and these modifications fall within the scope of the present invention.

The outline of the embodiment of the present invention is as follows. One embodiment of the present invention relates to a diamond-coated tool in which diamond is coated on a tool base material having a rake face, a flank face, and a cutting edge that becomes a boundary between the rake face and the flank face. In the diamond coated tool, the flank face of the tool base material includes: a first flank surface connected (in contact) with the tip; a second flank surface located farther from the cutting edge than the first flank surface and located further outward than the first flank surface when viewed from inside the tool base material; and a flank side step portion connecting the first flank surface and the second flank surface. The diamond coating layer may be formed on the blade tip, the first flank face, and the flank face-side step portion.

According to this aspect, the flank-side step portion functions as a peeling-off suppressing structure, and thus peeling off of the diamond coating layer on the flank side can be suppressed.

The rake face of the tool base material includes: a first rake surface connected (in contact) with the tip; a second rake surface located farther from the cutting edge than the first rake surface and located further outward than the first rake surface when viewed from inside the tool base material; and a rake face side step portion connecting the first rake face and the second rake face. The diamond coating layer may be formed on the first rake face and the rake face side step portion. According to this structure, the rake face side step portion functions as a peeling suppressing structure, whereby peeling of the diamond coating layer on the rake face side can be suppressed.

Another aspect of the present invention relates to a diamond coated tool in which diamond is coated on a tool base material having a rake face, a flank face, and a cutting edge which is a boundary between the rake face and the flank face. In the diamond coated tool, the rake face of the tool base material includes: a first rake surface connected (in contact) with the tip; a second rake surface located farther from the cutting edge than the first rake surface and located further outward than the first rake surface when viewed from inside the tool base material; and a rake face side step portion connecting the first rake face and the second rake face. The diamond coating layer is formed on the first rake face and the rake face side step portion, and the rake face of the diamond coated tool is configured to be flat.

According to this aspect, the rake face side step portion functions as a peeling suppressing structure, whereby peeling of the diamond coating layer on the rake face side can be suppressed, and the diamond-coated rake face is configured to be flat, whereby smooth outflow of cutting can be achieved. The diamond coating layer may not be formed on the second rake surface.

The shearing load applied to the diamond coating layer on the front blade surface side can be reduced by setting the angle of the blade edge to 90 degrees or more and setting the rake angle to a negative angle.

(availability in industry)

The present invention can be applied to a diamond coated tool.

(description of reference numerals)

1: a tool base material; 2: a knife tip; 3: a diamond coated tool; 10: a rake face;

11: a first rake surface; 12: a rake face side step portion; 13: a second rake surface; 20: a flank face;

21: a first relief surface; 22: a flank step part of the flank face; 23: a second relief surface;

30: a diamond coating layer; 31: and a cutting edge part.