WO2021190416A1

WO2021190416A1 - Tool shank and cutting tool

Info

Publication number: WO2021190416A1
Application number: PCT/CN2021/081866
Authority: WO
Inventors: 朱德林
Original assignee: 京瓷株式会社; 朱德林
Priority date: 2020-03-27
Filing date: 2021-03-19
Publication date: 2021-09-30
Also published as: CN113441772A

Abstract

A tool shank (1), extending along a rotating shaft from a front end to a rear end, the tool shank (1) being provided with, at the front end side thereof, a chip flute (11) opening to the outer peripheral surface thereof; the chip flute (11) is configured to allow a blade (2) to be mounted, and the blade (2) has an outer peripheral cutting edge (21) protruding from the outer peripheral surface of the tool shank (1); the chip flute (11) is provided with a bottom surface (12) and a wall surface (13) located in front of the bottom surface (12) in a rotational direction; seen from a direction directly facing the bottom surface (12), the wall surface (13) has a first wall surface (131) which has a concave-curved surface and of which the concave faces the outer circumferential surface, and a second wall surface (132) which has a convex-curved surface and of which the convex faces the outer peripheral surface; the first wall surface (131) is located between the rotating shaft and the peripheral cutting edge (21); and the second wall surface (132) is connected to the rear end of the first wall surface (131), and is closer to the rear end side of the tool shank (1) than the peripheral cutting edge (21). Further provided is a cutting tool comprising a tool shank and a blade. This structure can increase the strength of the tool shank and prolong the service life of the tool shank, and also has good chip removal performance.

Description

Tool holders and cutting tools

Technical field

The invention relates to the technical field of machining tools, in particular to a tool holder and a cutting tool.

Background technique

Patent document CN205519843U provides a milling cutter. The cutter body of the milling cutter is provided with an arc-shaped chip groove at the cutter head to discharge the chips generated by the blade. In this solution, the overall shape of the chip flute is concave, which can ensure a larger chip removal space. However, the tool body is easily damaged under the action of cutting load.

The patent document JPWO2016080486A1 discloses a tool whose chip flute of the tool handle is provided with a part of convex parts at the outer peripheral edge of the cutting insert, which can increase the life of the chip flute under the action of cutting load. However, the chip discharge space of the chip flute is small, which affects chip discharge.

In the past, it is difficult to combine the life of the flute and the performance of chip evacuation.

Summary of the invention

The purpose of the present invention is to provide a tool holder, which solves the problem that it is difficult to balance tool life and chip removal performance in the prior art.

Another object of the present invention is to provide a cutting tool having the above-mentioned tool holder.

To solve the above technical problems, the present invention adopts the following technical solutions:

According to one aspect of the present invention, the present invention provides a tool holder extending from a tip to a rear end along a rotating shaft, the tool holder having a chip flute opening to its outer peripheral surface on the tip side; the chip flute It is configured to install a blade, and the blade has a peripheral edge protruding from the outer peripheral surface of the handle; the chip flute has a bottom surface and a wall surface located in front of the rotation direction of the bottom surface; viewed from a direction directly opposite to the bottom surface, The wall surface has a first wall surface having a concave curved surface shape and the concave surface facing the outer peripheral surface and a second wall surface having a convex curved surface shape and the convex surface facing the outer peripheral surface; the first wall surface is located between the rotating shaft and the outer peripheral surface Between the blades; the second wall surface connects the rear end of the first wall surface, and is closer to the rear end side of the shank than the outer peripheral blade.

According to another aspect of the present invention, the present invention provides a cutting tool, which is characterized by comprising the above-mentioned tool holder and an insert arranged in the chip flute of the tool holder; The outer peripheral edge of the outer peripheral surface of the shank.

It can be seen from the above technical solutions that the present invention has at least the following advantages and positive effects: In the tool holder of the present invention, the chip flute has a convex curved surface and the convex surface faces the outer peripheral surface of the second wall surface, which can improve the stress concentration of the chip flute and increase The rigidity of the tool holder at the chip flute reduces the deformation of the tool holder and improves the life of the tool holder. Moreover, the second wall surface is closer to the rear end side of the shank than the outer peripheral edge of the blade, and at the same time, the first wall surface located in front of the second wall has a concave curved surface and the concave surface faces the outer peripheral surface, thereby ensuring the alignment corresponding to the first wall surface. The chip groove area has a large chip removal space, which can be used to smoothly discharge the chips generated by the peripheral edge machining, and has a good chip removal performance.

Description of the drawings

Fig. 1 is a schematic diagram of a three-dimensional structure of an embodiment of a cutting tool of the present invention.

Fig. 2 is a front view of the seat surface of Fig. 1.

Fig. 3 is a schematic diagram of the processing state of the cutting tool of Fig. 1.

Fig. 4 is a straight view of the seat surface of another embodiment of the cutting tool of the present invention.

Fig. 5 is a straight view of the seat surface of another embodiment of the cutting tool of the present invention.

The reference signs are explained as follows: 10, cutting tool; 50, workpiece;

1. Tool holder; 11, chip groove; 12, bottom surface; 121, blade mounting groove; 13/13b, wall surface; 131/131a, first wall surface; 1311, plane; 1312, arc surface; 132/132b, first Two wall surfaces; 133/133a, third wall surface; 14, transition surface; 2/2b, blade; 21, outer peripheral edge; 22, bottom edge; 23, mounting hole.

Detailed ways

Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different implementations, which do not depart from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes, rather than limiting this invention.

The invention provides a knife handle and a cutting tool with the knife handle. The tool holder can be equipped with a blade, which drives the blade to rotate to process the workpiece, and discharges the chips generated during the blade processing.

1 and 2, according to an embodiment of the present invention, the cutting tool 10 includes a tool holder 1 and a blade 2 mounted on the tool holder 1.

The tool holder 1 extends from the tip end to the rear end along the rotation axis L, and the tool holder 1 rotates around the rotation axis L during processing. The tool holder 1 has a chip flute 11 opening to the outer peripheral surface on the tip side. The chip flutes 11 are configured to be able to install the blade 2. In this embodiment, there are a plurality of chip flutes 11 distributed on the outer circumference of the tool holder 1, and each chip flute 11 can be correspondingly installed with a blade 2.

Wherein, the blade 2 has a mounting hole 23 in the center thereof, so as to be fixedly mounted on the handle 1 by a fastener (not shown in the figure). In this embodiment, a plurality of peripheral edges 21 and a plurality of bottom edges 22 are formed on the outer peripheral edge of the blade 2, and each peripheral edge 21 is connected to a bottom edge 22. A plurality of peripheral blades 21 are evenly distributed around the mounting hole 23.

3, when the blade 2 is installed on the tool holder 1, one of the peripheral edges 21 protrudes from the outer peripheral surface of the tool holder 1, and serves as the main cutting edge to process the surface to be machined of the workpiece 50. The bottom edge 22 in contact with the outer peripheral edge 21 protrudes from the tip of the shank 1 and serves as a secondary cutting edge that contacts the other surface of the workpiece 50 when necessary to process the surface of the workpiece 50.

The installation angle of the blade 2 on the shank 1 can be adjusted by rotating around the installation hole 23 to use different peripheral edges 21 as main cutting edges.

The chips generated when the outer peripheral edge 21 processes the workpiece 50 are discharged through the chip flutes 11 of the tool holder 1.

1 and 2 again, the chip flute 11 has a bottom surface 12 and a wall surface 13 located forward of the bottom surface 12 in the direction of rotation. The bottom surface 12 and the wall surface 13 respectively constitute the boundary surface of the chip flute 11, and the space between the bottom surface 12 and the wall surface 13 respectively communicates with the tip end surface and the outer peripheral surface of the tool holder 1, so that the chips generated by machining are directed to the outer periphery of the tool holder 1. discharge.

In this embodiment, the bottom surface 12 is recessed with a blade installation groove 121 at a corner away from the wall surface 13, and the blade installation groove 121 penetrates the tip end surface and the outer peripheral surface of the tool holder 1. The blade installation groove 121 is used for the installation of the blade 2, and an outer peripheral edge 21 of the blade 2 protrudes from the side surface of the blade installation groove 121 to the outer peripheral surface of the handle 1; The apex protrudes from the apex of the handle 1.

There is a gap between the wall surface 13 and the blade mounting groove 121, so that there is a gap with the blade 2 to facilitate the discharge of chips.

Viewed from the direction facing the bottom surface 12 as shown in FIG. 2, the wall surface 13 has a first wall surface 131 having a concave curved surface with the concave surface facing the outer peripheral surface and a second wall surface 132 having a convex curved surface with the convex surface facing the outer peripheral surface. The first wall surface 131 is located between the rotation axis L and the outer peripheral edge 21. The second wall surface 132 is connected to the rear end of the first wall surface 131 and is closer to the rear end side of the shank 1 than the outer peripheral edge 21. The first wall surface 131 and the second wall surface 132 are in contact with the first inflection point P1.

According to this solution, the space enclosed by the first wall surface 131 can completely contain the outer peripheral edge 21 in the front-rear direction along the rotation axis L, so that the chip flute 11 has a larger chip evacuation space corresponding to the outer peripheral edge 21 and facilitates the discharge of chips. . By forming a convex part protruding toward the chip flute 11 by the convex surface of the second wall 132, the stress distribution of the wall 13 in the extending direction can be optimized, and the stress concentration phenomenon of the chip flute 11 can be improved. The convex part can increase the rigidity of the tool holder 1 at the chip flute 11, reduce the deformation of the tool holder 1, and increase the service life of the tool holder 1. Especially when the diameter of the tool holder 1 is small, the structure of the tool holder 1 itself is relatively weak. By providing the convex part corresponding to the second wall surface 132, the strength of the tool holder 1 is better.

In this embodiment, the wall surface 13 further has a third wall surface 133 having a concave curved surface and the concave surface facing the outer peripheral surface. The third wall surface 133 is connected to the rear end of the second wall surface 132 and is closer to the rear end side of the handle 1 than the blade 2. The second wall surface 132 and the third wall surface 133 are connected at the second inflection point P2.

The third wall surface 133 is located behind the blade 2 as a whole. On the one hand, a larger chip removal space is formed behind the blade 2 to further improve the chip removal performance; on the other hand, it is connected to the rear end of the second wall surface 132, which can also The wall surface 13 accelerates the convergence in the direction of the outer circumferential surface, reduces the length of the chip flute 11 extending to the rear end side, and increases the structural strength of the tool holder 1.

Preferably, the first wall surface 131 and the second wall surface 132 are tangent at the first inflection point P1, so that the first wall surface 131 and the second wall surface 132 are smoothly connected, and stress concentration is reduced. Similarly, the second wall surface 132 and the third wall surface 133 are tangent at the second inflection point P2, so that the second wall surface 132 and the third wall surface 133 are also smoothly connected.

Thus, the wall surface 13 is a smooth curved surface in the entire extending direction from the tip side to the outer peripheral surface. In addition, as shown in FIG. 1, the wall surface 13 and the bottom surface 12 are also connected by a circular arc transition through a rounded transition surface 14. Therefore, the overall stress distribution of the chip flute 11 is more uniform and the stress condition is improved.

1, the first wall surface 131, the second wall surface 132 and the third wall surface 133 are all closer to the outer peripheral surface as they approach the rear end side, so as to better guide the chips to be discharged in the direction of the outer peripheral surface.

Specifically, in this embodiment, the first wall surface 131 includes a flat surface 1311 at the tip side and an arc surface 1312 connected to the rear end of the flat surface 1311, and the concave surface of the arc surface 1312 faces the outer peripheral surface of the tool holder 1. The second wall surface 132 and the third wall surface 133 are both circular arc surfaces.

The first wall surface 131, the second wall surface 132, and the third wall surface 133 are all smooth curved surfaces, but the specific shape can be set according to the actual situation, for example, it can be a combination of at least one arc surface and at least one flat surface, or multiple arc surfaces When the shape of each wall surface is a combination of multiple surfaces, there is a smooth transition between the two adjacent surfaces, for example, it is better to be tangent at the intersection. As an example, in the structure shown in FIG. 4, the first wall surface 131a includes two circular arc surfaces, and the third wall surface 133a includes a circular arc surface and a flat surface. The cases where the first wall surface 131, the second wall surface 132 and the third wall surface 133 have other shapes will not be listed one by one.

The respective size parameters of the first wall surface 131, the second wall surface 132 and the third wall surface 133 can be flexibly adjusted according to the actual situation. The location is set.

As shown in FIG. 2, the rear end of the outer peripheral edge 21 of the passing blade 2 is defined as a vertical line G1 of the rotation axis L, and the rear end of the passing blade 2 is defined as a vertical line G2 of the rotation axis L. The first inflection point P1 is located between the vertical line G1 and the vertical line G2. The second inflection point P2 is located behind the vertical line G2.

Thus, at least a part of the second wall surface 132 is located between the rotating shaft L and the rear end of the blade 2. In this embodiment, the part located between the rotating shaft L and the rear end of the blade 2 is the first The second wall surface 132 between the inflection point P1 and the vertical line G2. Therefore, the position where the second wall surface 132 protrudes toward the blade 2 makes the position of the knife handle 1 corresponding to the blade 2 targeted to be strengthened, and the rigidity of the knife handle 1 is improved.

In addition, at least a part of the second wall surface 132 is also located in an imaginary area where the bottom edge 22 of the blade 2 extends along the rotation axis L toward the rear end side of the shank 1. As shown in FIG. 2, if a straight line G3 parallel to the rotation axis L is drawn through the inner boundary point of the bottom edge 22, the straight line G3 will intersect the second wall surface 132. The portion of the second wall surface 132 from the straight line G3 to the second inflection point P2 is located in the imaginary area where the bottom edge 22 extends, so that the tool holder 1 can be reinforced with respect to the bottom edge 22 portion.

In some embodiments, the axial distance between the first inflection point P1 and the second inflection point P2, that is, the distance along the direction of the rotation axis L, is between 1.0 mm and 4.5 mm, so as to disperse the stress and increase the rigidity of the tool holder 1. Effect. If it is less than 1.0 mm, stress concentration on the second wall surface 132 is likely to occur. If it is larger than 4.5mm, the rigidity of the tool holder 1 will be reduced.

The second wall surface 132 forms a convex portion protruding to the inside of the chip flute 11, and the minimum distance between the entire wall surface 13 and the blade 2 is located on the second wall surface 132, wherein the minimum distance is preferably 0.5 mm to 3.0 mm . In the structure shown in FIGS. 1 and 2, the minimum distance between the entire wall surface 13 and the blade 2 is located at the first inflection point P1. In another structure shown in FIG. 5, when the shape of the blade 2b is triangular, the minimum distance between the blade 2b and the wall surface 13b roughly corresponds to the middle of the second wall surface 132b.

Based on the solution of the present invention, in one embodiment, as shown in the following table, after simulation analysis experiment, under the same machining and cutting conditions, when 1000N restraint force is applied, compared with the traditional solution, the wall surface is arc-shaped chip removal Slot, the equivalent stress of the chip flute improved by this solution is reduced by about 15%, and the maximum principal stress is reduced by about 13%. It can be seen that this solution has a positive effect compared to the traditional solution.

To	施加拘束力(N)Apply binding force (N)	传统方案(MPa)Traditional solution (MPa)	本方案(MPa)This plan (MPa)	对比Compared
排屑槽等效应力Equivalent stress of chip flute	10001000	408.75408.75	354.59354.59	-15.27％-15.27%
最大主应力Maximum principal stress	10001000	401.78401.78	353.83353.83	-13.55％-13.55%

Although the present invention has been described with reference to a few typical embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present invention can be implemented in various forms without departing from the spirit or essence of the invention, it should be understood that the above-mentioned embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all changes and modifications falling within the scope of the claims or their equivalents shall be covered by the appended claims.

Claims

A tool shank extending from the tip to the rear end along the rotating shaft, characterized in that the tool shank has a chip flute opening to the outer peripheral surface on the tip side thereof;

The chip flute is configured to be able to install a blade, and the blade has a peripheral edge protruding from the outer peripheral surface of the handle;

The chip flute has a bottom surface and a wall surface located in front of the rotation direction of the bottom surface;

Viewed from the direction facing the bottom surface, the wall surface has a first wall surface having a concave curved surface and the concave surface facing the outer peripheral surface and a second wall surface having a convex curved surface and the convex surface facing the outer peripheral surface; the first The wall surface is located between the rotating shaft and the outer peripheral blade; the second wall surface is connected to the rear end of the first wall surface, and is closer to the rear end side of the shank than the outer peripheral blade.
The tool holder according to claim 1, wherein the first wall surface is closer to the outer peripheral surface as closer to the rear end side; the second wall surface is closer to the rear end side. Close to the outer peripheral surface.
The tool holder according to claim 1, wherein, viewed from a direction facing the bottom surface, at least a part of the second wall surface is located between the rotating shaft and the rear end of the blade.
The tool holder according to claim 1, wherein, viewed from a direction facing the bottom surface, there is a gap between the wall surface and the blade.
The tool holder according to claim 4, wherein the minimum distance between the wall surface and the blade is located on the second wall surface.
The tool holder according to claim 1, wherein the first wall surface and the second wall surface are tangent at the point where they meet.
The tool holder according to claim 1, wherein, viewed from the direction facing the bottom surface, the wall surface further has a third wall surface having a concave curved surface and the concave surface facing the outer peripheral surface; the third wall surface The rear end of the second wall surface is connected, and is closer to the rear end side than the blade.
The tool holder according to claim 7, wherein the third wall surface and the second wall surface are tangent at the point where they meet.
A cutting tool, characterized by comprising the tool holder according to any one of claims 1-8 and a blade arranged in the chip flute of the tool holder; the blade has a protruding from the tool holder The peripheral edge of the outer peripheral surface.
The cutting tool according to claim 9, wherein the blade further has a bottom edge protruding from the tip of the handle;

Viewed from a direction facing the bottom surface, at least a part of the second wall surface is located in an imaginary area where the bottom edge extends in the direction of the rear end side along the rotation axis.