JPH11235607A - Throwaway tip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To identify the appearance at a glance by forming an identification mark at least one of upper and lower sufaces in such a manner as to be like a projection as a whole. SOLUTION: An identification mark 7 forms information on a braker shape, and a chip shape such as a corner radius, a clearance angle or the like by characters, symbols or the like, and the information is displayed in a breaker area 6 of at least one of upper 2 and lower surfaces. An identification mark 7 like a projection as a whole is formed in such a manner as to be floated upward from a recessed curved surface of the breaker area 6. Thus, the identification mark 7 can be recognized at a glance from the appearance. The height of the top of the identification mark 7 is made equal to the height of a boss surface 5, whereby when a tip 1 is reversed to be taken as the lower surface, it can be served as a seating surface so as to heighten the stability of seating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throw-away insert used by being attached to a tool body.

[0002]

2. Description of the Related Art In the field of cutting, a throw-away tip (hereinafter referred to as "tip") removably mounted on a cutter, a tool holder, or the like is widely used. Various types of chips having different shapes, materials, and the like are provided. The shape includes a breaker shape, a corner radius or a clearance angle, and the material type includes a cemented carbide, a coated cemented carbide, a cermet, a ceramic, an ultra-high pressure sintered body, and the like. Among these various types of chips, those having an optimum shape and material type are selected and used depending on the type of processing material, processing conditions, target finish surface quality, and the like.

Therefore, usually, a mark for identifying a shape, a material type, and the like is displayed on a chip to prevent a selection error at the time of replacement (hereinafter, referred to as an "identification mark"). The identification mark is displayed on the upper surface, the lower surface, or the side surface of the chip by a display means such as a contact method, a laser method, or a press method.

[0004] Here, the laser method is a method of irradiating a laser beam, thermally transforming a portion from the chip surface to a depth of several μm, and performing engraving. The laser engraving operation is a mechanized and automated operation in that a large number of chips can be arranged and marked continuously.

[0005] Next, the press method is a method of imprinting a mark on at least one of the upper surface and the lower surface of a chip simultaneously with press molding. As shown in FIG. 4, the information disclosed in Japanese Patent Application Laid-Open No. Hei 8-66805 displays information on the shape of the breaker and the clearance angle of the cutting edge on the boss surface 5 so as to be entirely concave. is there. The pressing method has an advantage that the number of steps is reduced as compared with the above-described laser method, so that the processing cost can be reduced.

[0006]

The problems of the prior art are listed below.

[0007] In the laser method, the identification mark tends to be unclear, and the identification mark may disappear due to rubbing with chips. The reason why the identification mark becomes unclear is that the marking can be performed only to a depth of several μm from the surface.
If the laser irradiation output is increased and stamped, the heat-affected layer may extend to the inside of the chip, and cracks may occur due to thermal shock caused by the temperature difference between heating and cooling.
Brittle materials such as cemented carbides and ceramics are materials that are vulnerable to thermal shock, and therefore have to be stamped shallowly and become unclear.

[0008] Further, the melted portion thermally transformed by the laser irradiation tends to be a starting point of cracks, and may cause chipping or chipping during cutting. It has also been clarified that if the mark is imprinted near the cutting edge, the cutting performance is adversely affected. Discoloration of the chip surface due to cutting heat may make it impossible to determine the identification mark.

Further, the engraving operation by the laser method has caused an increase in the number of chip processing steps, and the processing cost has been increased accordingly. Therefore, there has been a demand for cost reduction.

Next, in the second prior art disclosed in Japanese Patent Application Laid-Open No. 8-66805, since characters, symbols and the like are engraved in a concave shape as a whole, cutting powder, cutting oil, and the like are embedded in the concave portion. In some cases, they cannot be easily identified at first glance during use. Further, the chip strength may be reduced due to the presence of a concave portion such as a notch, and in particular, there is a risk of causing a cutting edge defect at the beginning of cutting during intermittent cutting. If a concave identification mark as a whole is stamped on the boss surface of a negative chip that can be used on both sides with mounting holes, the contact area between the boss surface and the bottom surface of the chip mounting seat will be small, and seating will not be possible. May be stable.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is directed to a throw-away chip on which an identification mark composed of characters, symbols, or a combination thereof is displayed. shape,
Information on corner radius or clearance angle and other shapes,
Alternatively, the identification mark indicating information on the material type is formed on at least one of the upper surface and the lower surface by press molding so as to form a convex shape as a whole.

Further, the identification mark is arranged in the breaker area, and is formed in a convex shape as a whole so as to float upward from the concave curved surface of the breaker area.

[0013]

Next, an embodiment of the present invention will be described with reference to the drawings.

1 and 2, FIG. 1 is a plan view of a throw-away tip (hereinafter referred to as "chip") according to the present invention, and FIG. 2 is an enlarged perspective view of a corner portion thereof. Diamond-shaped flat chip 1 shown as an example
In the case of, the four corner portions 3a of the upper surface 2 serving as a rake face,
Of 3b, the corner 3a having an acute angle is used as a used corner. "DM" or "08", which is the identification mark 7, is displayed at a position spaced inward from the corner 3a. The identification mark 7 is a display body of an appropriate size that can be recognized at a glance by the appearance. Where "DM" is
The chip breaker shape is shown, and “08” indicates that the corner radius of the chip is 0.8 mm.

The identification mark 7 comprises information on the chip shape such as the shape of the breaker, the corner radius, the clearance angle, etc., as characters, symbols, and the like, and is displayed on the breaker region 6 on at least one of the upper surface 2 or the lower surface by press molding. Have been. Similarly, information on the chip type can be displayed. The information on the material type is information on various tool materials such as a cemented carbide, a coated cemented carbide, a cermet, a ceramic, and an ultra-high pressure sintered body. By displaying such information, it is possible to prevent a replacement error from occurring. For example, the size of the corner radius is one of those that cannot be easily recognized by the appearance. The size of the corner radius affects the life of the cutting edge, the dimensional accuracy, and the like, and an optimum one is selected according to the type of the processing material and the processing conditions. If you make a wrong choice, you may incur significant losses, such as defective products. Therefore, the display of the identification mark 7 makes it possible to easily select the most appropriate chip from among the various types of chips 1 without error.

The chip 1 has a mounting hole 4 formed in the center.
, And is directly fastened and fixed to the tool body. On this occasion,
In the case of a negative chip that can be used on both the upper surface 2 and the lower surface, the boss surface 5 formed around the mounting hole 4 serves as a seating surface with respect to the bottom wall of the chip mounting seat, thereby ensuring seating stability. Play a role.

Here, the chip 1 having the mounting hole 4 is formed.
Has a problem that seating stability is inferior to a chip having no mounting hole 4. This is because the contact area between the boss surface 5 and the chip mounting seat bottom wall surface is small. When the identification mark 7 having a concave shape as a whole is attached to the boss surface 5 having a small contact area, the contact area is further reduced, and the stability of seating is further deteriorated.

Therefore, in the case of the chip 1 in which the mounting hole 4 is formed, as shown in the present embodiment, the identification mark 7 must be displayed in an area other than the boss face 5, that is, in the breaker area 6 or the like. Absent.

However, the breaker region 6 is formed in order to improve the cutting performance. Specifically, the breaker region 6 is intended to enhance the chip controllability, reduce the cutting resistance, and perform smooth cutting. It is a basic function, and is formed into an optimum completed shape by itself. Therefore, when the original optimum breaker shape is changed by attaching a concave identification mark 7 or the like such as a notch, the chip processing performance is reduced, and the cutting edge loss due to a decrease in chip strength is caused. It is not preferable because it may be caused. In particular, cutting edge defects are likely to occur in the case of a cutting mode in which a mechanical impact occurs intermittently, or in the case of heavy cutting with a deep cut and high feed.

Accordingly, the present invention provides a display means capable of avoiding such a problem when displaying the identification mark 7 in the breaker area 6. That is, the identification mark 7 having a convex shape as a whole is formed so as to float upward from the concave curved surface of the breaker region 6.
This makes it possible to recognize the identification mark 7 at a glance by the appearance without preventing the mark from being obscured due to chips or the like being buried in the concave groove as in the related art. In addition, by forming the height of the top of the identification mark 7 equal to the height of the boss surface 5, the chip 1 can serve as a seating surface when the chip 1 is turned upside down to be a lower surface, and the seating stability can be improved. Can also.

The identification mark 7 having a convex shape as a whole
Does not limit the formation in the breaker area 6, and if there is enough space to display,
It may be displayed on the boss surface 5 or other positions. Upper surface 2
Alternatively, when there is no space for displaying the identification mark 7 on the lower surface, it can be displayed on the side surface of the chip by using a laser method as the second display means.

FIG. 3 shows a positive plate-type chip 1 for a cutter having a square flat plate shape according to a second embodiment of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted. On the upper surface 2 constituting the rake face, lands 8 and four independent breaker regions 6 extending along the cutting edge ridge are formed. The land 8 is for securing the cutting edge strength, and the breaker region 6 is for reducing the cutting resistance and improving the chip controllability.

At substantially the center of each breaker area 6, [J] as an identification mark 7 is displayed. In the case of milling that is interrupted cutting, since mechanical impacts repeatedly act, consideration for chipping and cutting edge defects is particularly important, and the identification mark 7 having a convex shape as a whole can avoid such inconvenience. is there. Also, by arranging the identification mark 7 in the direction in which the chips flow out,
You can also control the chips.

Further, a wide boss surface 5 is secured in the center of the chip 1, so that stability of seating does not matter.

[0025]

As described above, according to the present invention, it is possible to display an identification mark in a breaker region having a concave curved surface without reducing the chip strength. In addition, since the identification mark has a convex shape as a whole, the identification mark can be clearly identified at a glance without being clogged with cutting chips, cutting oil, or the like, and cannot be identified. This makes it possible to easily perform chip management, to prevent a mounting error at the time of chip replacement, and to perform work safely.

[Brief description of the drawings]

FIG. 1 is a plan view of a chip showing one embodiment of the present invention.

FIG. 2 is an enlarged perspective view of the vicinity of a corner of the chip shown in FIG.

FIG. 3 is a plan view of a chip showing a second embodiment of the present invention.

FIG. 4 is a plan view showing an example of a conventional chip.

[Explanation of symbols]

 1 chip 2 top surface 5 boss surface 6 breaker area 7 identification mark 8 land

Claims (2)

[Claims] 1. A throw-away chip on which an identification mark 7 composed of a character, a symbol, or a combination thereof is displayed, information on a breaker shape, a corner radius, a clearance angle, and other shapes of the throw-away chip, or information on a material type. A throw-away chip, wherein the identification mark 7 indicating information is formed on at least one of the upper surface 2 and the lower surface so as to form a convex shape as a whole by press molding. 2. The device according to claim 1, wherein the identification mark is arranged in the breaker region and is formed in a convex shape as a whole so as to float upward from a concave curved surface of the breaker region. The described throwaway tip.