JPH0226568Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" This invention is applicable to throw-away type cutters such as face mills, side cutters, boring cutters, etc., in which the cutting tip is fixed to the tip mounting surface of the cutter body via a supporter. This relates to milling tools.

``Conventional technology'' In an indexable milling tool, the cutting edge tip is not directly fixed to the tip mounting surface of the cutter body.
Some cutters are fixed by interposing a supporter made of a hard material between the tip and the cutter body. This type of indexable milling tool has a structure as shown in FIG. 21, for example. In other words, a plurality of cutting blade tips 2 are detachably attached to the tip of a cutter body 1 at appropriate intervals in the circumferential direction via a supporter 3, and the supporter 3 is provided with a screw. It is composed of an exchangeable anvil (bottom plate) 6 fixed by 4 and 5, an axial support 7, and a radial support 8 brazed to the cutter body 1. In a tool with such a configuration, the anvil 6 and the pedestals 7, 8 are all made of cemented carbide, and the cutter body 1 is not subject to wear or sag, resulting in a long life and high precision. It has the advantage of being able to maintain Another advantage of this type of tool is that even if the cutting edge tip 2 is damaged, the cutter body 1 will not be damaged, and the anvil 6 and axial support 7 can be restored with simple parts replacement. There is also.

"Problem that the invention aims to solve" By the way, in order to extend the life of the cutter body 1, it is important to support the cutting tip 2 with a separate member (supporter 3), as in the above-mentioned tool. However, another important factor is to reduce wear on the main body attachment part, as well as to reduce abrasions caused by chips and scratches during handling. In order to meet such demands, the entire cutter body 1 must be made hard by heat treatment.
From the perspective of tool machining costs, the cutter body 1
It is preferable that the processing is as simple as possible.

However, in the case of the above-mentioned tool, since the radial holder 8 is brazed with cemented carbide, grinding is required to run out the outer periphery, which tends to be costly, and in the event that it breaks, In this case, there was a problem that it could not be replaced. In addition, since the anvil 6 and the pedestal 7 are fixed with screws, the screw holes reduce the rigidity and easily cause cracks, etc., and the position and dimensional accuracy of the screw hole machining must be exact. There were problems such as it was difficult to set a suitable outer peripheral run-out, and it was not possible to change the size of the axial support member along with the cutting tip. Moreover, the grinding finish of the cutting edge groove requires particularly complicated setup angles.
In addition to the dissatisfaction that the processing cost is high, when the entire cutter body 1 is heat treated, there are problems such as insufficient hardness due to deformation and annealing of the brazed portion.

"Means for Solving the Problems" The present invention effectively solves the above-mentioned problems by interposing a supporter between the tip mounting surface of the cutter body and the seating surface of the cutting blade tip. and a sheet member provided with a tip positioning wall against which one side of the cutting blade tip abuts, and an axial support member placed on the sheet member surface in contact with the other side of the cutting blade tip. and fixing means,
Two wedges are inserted between the upper surfaces of the sheet member and the cutting blade tip and the inner surface of the cutting blade storage groove to fix the sheet member and the cutting blade tip, and these wedges are inserted into the inner surface of the cutting blade storage groove. The seat member and the axial support member are made of cemented carbide or a powder sintered alloy such as cermet or ceramics.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, while referring to Figures 1 to 12,
Describing the embodiment of the tool, the tool
As shown in the figure or FIG. 5, a cutting blade tip 11 is attached to a cutting blade storage groove 10 formed at the tip of the cutter body 1 in a supporter 1, which is the most distinctive feature of the present invention.
It has a basic configuration in which it is placed via a holder 2 and fixed by a fixing means 13. The cutting blade storage groove 10 is tapered so as to become narrower toward the back.

In the embodiment, the cutting blade tip 11 is formed into a flat plate shape having a substantially square plane, and the supporter 12 is formed between the chip mounting surface 10a of the cutting blade storage groove 10 and the seating surface of the cutting blade tip 11. Face 11
It is mainly composed of a sheet member 14 interposed between the cutter body 1 and the axial support member 15 that supports the cutting blade tip side surface 11b in the axial direction (Y-Y direction in FIG. 2) of the cutter body 1. Each member 1
4 and 15 are assembled, a rectangular cutting blade tip seating portion 16 as shown in FIG. 6 is formed in the area surrounded by these members.

Moreover, each member 1 constituting the supporter 12
4 and 15 are fixing means for fixing these at the same time, that is, in the embodiment, a supporter clamp wedge 1
7 and screws 18 to be fixed to the cutter body 1. That is, in the cutting blade storage groove 10 of the cutter body 1, the sheet member 14 is
As shown in FIG.
An axial support member 15 is placed on the axial proximal end side (upper side in FIG. 2) of the seat member 14 and the axial support member 15 is placed on the base end side of the seat member 14 (upper side in FIG. A support 15 is also fixed within the cutting blade storage groove 10.

Next, to explain in detail each of the members 14 and 15, the sheet member 14 is made of cemented carbide,
It is made of a powdered sintered alloy such as cermet or ceramic, and as shown in FIGS. 7 to 9, a part of the cutter body 1 has a pentagonal shape that corresponds to the outer shape of the cutter body 1, and a cutout is formed on the upper surface. The side surface of the blade tip 11, that is, the central axis of the cutter body 1 (Fig. 1
Positioning wall portion 19 on which the side surface 11c in the -X-ray) direction and the side surface of the axial support member 15 abut
is provided. In addition, this positioning wall portion 19
The left side of the top surface, which is lowered one step further than the (Fig. 7 left side)
A mounting surface 14a for the cutting blade tip 11 is formed therein, and a recessed portion 14b is provided which is slightly lower than this mounting surface 14a, and furthermore, it is in the same plane as this cutting blade tip mounting surface 14a. On the right side of the upper surface of the sheet member 14, a mounting surface 14c for the axial support member 15 is provided.

Incidentally, the tip positioning wall portion 19 is provided with an inclined surface 19a on which the respective side surfaces of the cutting blade tip 11 and the axial support member 15 abut to position them.
The positioning wall portion 19 and the mounting surface 14a, 1 having a
4c, a grinding recess 14d is provided. Further, reference numeral 14e in the figure represents a lower surface that comes into contact with the tip mounting surface 10a of the cutter body 1.

On the other hand, as shown in FIGS. 10 to 12, the axial support member 15 is made of cemented carbide or a powder sintered alloy such as cermet or ceramic, like the sheet member 14 described above. Further, its upper surface (upper surface in FIG. 11) 15a is the surface on which the supporter clamp wedge 17 comes into contact, and the surface (lower surface) 15b on the opposite side to this surface 15a.
is a contact surface that comes into contact with the sheet member 14. Furthermore, this axial support member 15
is provided with a positioning portion 15c that contacts and supports the cutting blade tip 11, and is also provided with a recessed portion 15d and a chamfered portion 15e, respectively. Further, the surface 15f opposite to the surface on which the positioning portions 15c and the like are formed comes into contact with the cutting blade storage groove 10 of the cutter body 1, so that the axial positioning of the axial support member 15 is facilitated. It's becoming more common. Regarding the positioning of the axial support member 15 in the central axis direction, the inclined surface 15g formed on the axial support member 15 and the inclined surface 19a formed on the positioning wall portion 19 of the sheet member 14 are used. This is now done in close contact with each other.

The fixing means 13 for fixing the cutting blade tip 11 is composed of a tip clamping wedge 20 and a screw 21 for fixing the wedge 20 to the cutter body 1.

Next, the operation of this embodiment configured as above will be explained.

In order to put this tool into the assembled state as shown in FIG. The axial support member 15 is fitted into the storage groove 10, and then the axial support member 15 is placed thereon, and these are fastened with a supporter clamp wedge 17 and a screw 18. Then, the cutting blade tip 11 is placed on the cutting blade tip seating portion 16 constituted by the sheet member 14 and the axial support member 15, and is fixed with the chip clamping wedge 20 and the screw 21, as shown in FIG. The milling tool is completed.

This assembly consists of three members (sheet member 14, axial support member 15, and cutting blade tip 1).
1) is simply fixed with screws, wedges, etc., and no special technology or equipment is required for assembly, and each member can be formed in large quantities from an appropriate alloy. Furthermore, since heat treatment of the cutter body 1 and finishing of the groove (milling) are easy, processing costs can be reduced. Further, since the sheet member 14 and the axial support member 15 are not provided with screw holes, the rigidity of these members is ensured, and cracks are less likely to occur. Furthermore, since it is not directly fixed with screws, there is no need to provide screw holes with strict dimensional accuracy, and the outer circumference can be precisely set. Further, when changing the cutting tip to another shape, the axial support member may be adapted to the cutting tip.

In addition, each of these parts can be easily replaced, so when a part is missing, etc.
The replacement can be easily carried out without requiring a special engineer.

Next, a second embodiment of the present invention will be described. In the following description, parts with the same names as those in the first embodiment are given the same reference numerals to simplify the description.

13 to 20 show a second embodiment of the present invention, in which the sheet member 1
This embodiment differs from the previous embodiment in that the positioning wall portion 19 of the cutting blade tip 11 provided at the tip 4 is shortened, and only the cutting blade tip 11 is brought into contact with the inclined surface 19a of this wall portion 19. There is. In this case, the positioning of the axial support member 15 in the central axis direction is performed using the axial support member 15.
It is constructed so that it directly contacts the cutter housing groove 10 of the cutter body 1, and the portion where the wall portion 19 is not formed serves as a grinding recess 14d. Note that this part may be flush with the supporter mounting surface, but in order to reduce the grinding part,
It is preferable to make it thin.

Also, to supplement the explanation regarding the axial support member 15, this is the seat member 1.
The positioning wall portion 19 of No. 4 is formed longer due to the notch, and in the above embodiment, the positioning wall portion 1
The inclined surface 15g that contacts the cutter body 1 is the surface that contacts the cutter body 1, and this surface is orthogonal to both the upper surface 15a and the lower surface 15b. Note that the other configurations of the fixing means and the like are the same as those of the first embodiment.

"Effects of the Invention" As explained above, the present invention provides the following excellent effects.

(a) Since a powder sintered alloy supporter is interposed between the cutting tip and the cutter body, the cutter body is less likely to be damaged and has high rigidity.

(b) Each member (sheet member, axial support member) constituting the supporter is configured to be detachable from the cutter body, so that it can be easily replaced when a member is missing.

(c) Heat treatment and groove finishing (milling) of the cutter body are easy and processing costs can be reduced.

(d) By controlling the accuracy of the support member, the runout accuracy of the tool can be controlled.

(e) Since the sheet member and the axial support member are not provided with screw holes, the rigidity of these members is ensured and cracks are less likely to occur.

(f) Since it is not fixed with screws, there is no need to provide screw holes with strict dimensional accuracy, and the outer circumference runout can be set precisely.

(g) By changing the cutting tip and axial support member as a set, it is easy to change the cutting tip to another type.

(h) In the case of fixing with a wedge, the cutting blade storage groove can be used as is without major changes in the shape.

[Brief explanation of drawings]

1 to 12 are diagrams for explaining the first embodiment of the present invention, in which FIG. 1 is a perspective view showing the state in which the supporter and the cutting tip are attached to the cutter body, and FIG. Its cross-sectional view, Figure 3, is
Figure 4 is a view from arrow A in the figure, Figure 4 is a view from arrow B in Figure 3, and Figure 5 is a view from arrow B in Figure 3.
The figure is a plan view showing the state in which the chip is assembled to the supporter, Figure 6 is a plan view of the whole supporter showing the state in which the supporter is assembled, Figure 7 is a plan view of the sheet member, and Figure 8 is the C shown in Figure 7. Arrow view, Fig. 9 is No. 8
10 is a plan view of the axial support member, FIG. 11 is a view taken along the E arrow in FIG. 10, and FIG. 12 is a view taken along the F arrow in FIG. 11. Also, the first
3 to 20 show a second embodiment of the present invention, FIG. 13 is a plan view similar to FIG. 6 showing the assembled supporter, FIG. 14 is a plan view of the sheet member, and FIG. 15 is a view in the direction of the G arrow in FIG. 14, FIG. 16 is a view in the direction of the H arrow in FIG. 15, FIG. 17 is a plan view of the axial support member, and FIG. 18 is a view in the direction of the I arrow in FIG. 17. Fig. 19 is a view taken in the direction of arrow J in Fig. 18, Fig. 20 is a sectional view showing the supporter and cutting tip attached to the cutter body, and Fig. 21 is a structural example of a conventional throw-away type milling tool. FIG. 1...Cut body, 10...Groove for storing cutting blade, 1
0a...Tip mounting surface, 11...Cutting blade tip, 1
1a...Setting surface of the cutting blade tip, 11b...Side surface of the cutting blade tip in the axial direction of the cutter body, 11c...Side surface of the cutting blade tip in the central axis direction of the cutter body, 12...
Supporter, 13... Fixing means, 14... Sheet member, 14a... Placement surface, 15... Axial support member, 15c... Positioning part, 16... Cutting blade tip seating surface, 17... For supporter clamp Wedge, 18...screw, 19...chip positioning wall.

Claims (1)

[Claim for Utility Model Registration] A polygonal flat plate-shaped cutting tip is placed on the tip mounting surface in the cutting blade storage groove of the cutter body via a supporter, and the cutting tip is fixed by a fixing means. In the indexable milling tool, the supporter is a chip positioning wall that is interposed between the chip mounting surface of the cutter body and the seating surface of the cutting blade chip, and against which one side of the cutting blade chip comes into contact. and an axial support member placed on the surface of the sheet member in contact with the other side surface of the cutting blade tip, and the fixing means is configured to support the sheet member and the cutting blade tip. Two wedges are inserted between the top surface of each blade and the inner surface of the groove for storing cutting blades to fix the sheet member and the cutting blade tip, and a bolt is used to push the wedges toward the back of the groove for storing the cutting blade tip. A throw-away type milling tool characterized in that the seat member and the axial support member are made of a powder sintered alloy such as cemented carbide, cermet, or ceramics.