JP2003127001A - Tip holder and cutting tool using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tip holder which can be mounted without depending on the shape of a tip and the circuit pattern of a conductive circuit and can be used for a long time, and a cutting tool using the same. SOLUTION: This invention is used to manufacture a tip holder for forming pocket 5 for fixedly retaining a throw-away tip 4 at the tip end of a columnar shank 3 mounted on a tool rest 2, and also for forming a probe bore 9 for fitting a probe member 8 in which a pair of probes 7a, 7b are integrated into the pocket 5 in order to protrude from the pocket 5 in a detachable state, and the cutting tool on which the throw-away tip provided with the conductive circuit on it is mounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holder and a cutting tool for holding a throw-away tip, and more particularly to a holder for holding a throw-away tip having a conductive circuit and a cutting tool using the same.

[0002]

2. Description of the Related Art Conventionally, a method of automatically determining the tool life by detecting the amount of wear of a cutting edge of a cutting tool has been studied. For example, Japanese Patent Laid-Open No. 9-38846 discloses a slow tool. A method is provided in which a conductive circuit (sensor circuit) made of a conductive film is provided at a predetermined position on the surface of an away tip (hereinafter simply referred to as a tip), and the wear amount of a cutting edge is detected by a change in resistance value due to wear of the sensor circuit. Have been described.

Further, according to the publication, in order to measure the resistance value of the sensor circuit, a pair of probes which are integrally attached to a chip holder for holding the chip and contact both ends of the sensor circuit. It describes a method of forming a (connection terminal) and connecting it to a signal detection unit such as a resistance measuring instrument via a pair of external wirings connected to the probe.

[0004]

However, in the method of integrally mounting the probe on the chip holder as described above, when the probe portion which is most susceptible to damage such as disconnection or breakage due to load on the probe fails. ,
There was a problem that the holder had to be replaced.

There is also a problem that the probe size and mounting position may differ depending on the shape of the chip and the sensor circuit pattern, and the chip holder must be replaced each time.

Further, a chip having no sensor circuit may be attached depending on processing conditions. In this case, the tip of the probe may be worn due to the surface shape of the chip having no sensor circuit. There is a problem that the possible chip shapes are limited.

The present invention has been made to solve the above problems, and an object thereof is a chip that can be attached regardless of the shape of the chip or the circuit pattern of the conductive circuit and that can be used for a long period of time. It is to provide a holder and a cutting tool using the holder.

[0008]

DISCLOSURE OF THE INVENTION As a result of studying the above-mentioned problems, the inventors of the present invention have found that a probe member having a pair of probes integrated in a pocket of a shank is detachably fitted to the chip, It has been found that the tip holder itself can be used for a long period of time because it is possible to combine and attach probe members according to the shape and the circuit pattern of the conductive circuit, and it is possible to replace only the probe that easily wears out.

That is, in the tip holder of the present invention, a pocket for fixing and holding the throw-away tip is formed at the tip of the columnar shank attached to the tool rest, and a pair of probes is integrated in the pocket. It is characterized in that a probe hole for inserting the probe member in a detachable state so as to protrude from the pocket is formed.

Here, the bottom surface of the pocket is provided with a first through hole for penetrating the probe member and a second through hole for penetrating the screw member, and is higher than the shank. By disposing a hard plate-shaped high hardness member,
It is desirable that the high hardness member be fixed to the shank through the second through hole and that the center of the second through hole be formed at a position deviated from the center of the high hardness member.

Further, it is preferable that a conductive circuit is formed on at least the surface of the throw-away tip and a cutout is formed on at least a part of the high hardness member in contact with the conductive circuit.

Further, the cutting tool of the present invention is characterized in that a throw-away tip having a conductive circuit is attached to the pocket of the tip holder.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An example of a tip holder of the present invention will be described with reference to FIG. 1 which is an exploded view thereof.

According to FIG. 1, the tip holder 1 is a tool rest 2
At the tip of the columnar shank 3 that is fixed and held on the side surface of
A pocket 5 for fixing and holding a throw-away tip (hereinafter simply referred to as a tip) 4 is formed. It should be noted that, according to FIG. 1, the pocket 5 has two peripheral surfaces 3 from the tip 3a of the shank 3 so that the tip 4 can be easily attached and detached.
The chip 4 has a notch opening to the sides b and 3c, and the conductive circuit 6 is routed on the surface of the chip 4, and a pair of connection terminals (not shown) are provided on the main surface in contact with the bottom surface 5a of the pocket 5. Are formed.

According to the present invention, the probe member 8 having the pair of probes 7 (7a, 7b) integrated therein is detachably fitted into the wall surface or the bottom surface of the pocket 5 so as to project from the pocket 5. A major feature is that the probe hole 9 is formed, which allows the chip 4 to be easily attached to the chip holder 1 even when the shape of the chip or the circuit pattern of the conductive circuit 6 changes. Since only the probe 7 that is easily worn can be replaced, the tip holder 1 can be used for a long period of time.

Further, a pair of wiring lines 10 (10a, 10b) are connected to each of the pair of probes 7, as shown in FIG.
According to the method, the wiring line 10 is drawn out from the opposite end of the shank 3 and connected to a signal detector (not shown) such as a resistance measuring machine.

Further, according to the present invention, as shown in FIG. 1, a cemented carbide harder than the shank 3 is formed on the bottom surface 5a of the pocket 5 in order to prevent the pocket 5 from being damaged by the collision of the chip 4 or the like. It is desirable that a plate-shaped high-hardness member 11 made of a high-hardness material such as is disposed. The high-hardness member 11 penetrates from the upper surface to the lower surface to insert the probe member 8 into the probe hole 9. First opening
Through hole (probe through hole) 12 is formed.

Further, according to FIG. 1, the high hardness member 11 has a second through hole (screw hole) 13 for penetrating the screw member.
The high hardness member 11 is fixed to the holder 1 (shank 3) by the screw hole 13. Here, according to the present invention, in order to secure the width of the portion of the high hardness member 11 located between the probe through hole 12 and the screw hole 13 and maintain the mechanical strength of this portion, the high hardness It is desirable to form the center of the screw hole 13 at a position deviated from the center of the high hardness member 11 on the surface of the member 11.

Further, according to the present invention, the high hardness member 1 is provided for at least the chip 4 having the conductive circuit 6 on the surface.
It is desirable to form a notch on at least a part of the surface of the tip 4 of the chip 1 in contact with the conductive circuit 6, particularly a corner portion of the tip, whereby the tip holder 1 and the high hardness member 1 are formed.
It is possible to prevent the conductive circuit 6 from being worn due to the contact between the chip 1 and the chip 4 and causing a change in the resistance value and disconnection.

According to the present invention, the probe member 8 is fitted in the probe hole 9 in a state of protruding from the upper surface of the high hardness member 11, and the pair of probes 7a and 7b of the probe member 8 are attached to the tip holder 1. A circuit is formed which is respectively connected to the pair of wiring lines 10a and 10b which are routed inside, and which passes through the wiring line 10a-the probe 7a-the conductive circuit 6 in the chip 4-the probe 7b-the wiring line 10b.

As shown in FIG. 2, the probe member 8 includes a pair of probes 7a and 7b which are made of a heat-resistant material such as resin.
Each of the wiring lines 10 is fixed in an insulated state by a probe fixing member 17 made of an insulating member, and the wiring line 10 connected to the probes 7a and 7b has a connecting portion that can be attached and detached in the middle. However, according to this, the probe member 8 can be attached and detached more easily.

Further, as shown in FIG. 1, the shank 3 is made of alloy steel, and as its material type, alloy steel such as chrome / molybdenum steel, nickel / chromium steel, nickel / chromium / molybdenum steel, or C is added to iron. , Si, Mn, P and S
It is preferable that the base is a carbon alloy steel to which is added, and an alloy steel to which chromium, tungsten, manganese, molybdenum, vanadium and the like are added.

Further, as shown in FIG. 1, the wiring line 10 in the shank 3 has a pair of wiring lines 10a in a through hole 15 penetrating the shank 3 and connecting the probe 7 and the cutout portion 14 to each other. Although it is preferable that the wire 10b passes through the wiring line 10b in order to protect the wiring line 10 and prevent noise resistance from entering from the outside, the present invention is not limited to this. For example, the conductive shank 3 may be used. The main body may also serve as one wiring line, and the other wiring line may be disposed inside the shank 3 while being insulated from the shank 3.

Further, according to FIG. 1, the upper surface of the chip 4 is fixed by the pressing metal fitting 22, but the present invention is not limited to this, and it is a pin lock type using an L-shaped lever. Throw-away tip 4 with restraint or clamp bolt
It may be a screw-fastening type that fixes the to the holder 1.

Further, according to FIG. 1, the corner portion 35 where the main surface of the throw-away tip 4 opposite to the bottom surface 5a of the pocket 5 and the two flanks located at the open ends of the pocket 5 intersect is a cutting edge. The sensor line 37 is formed in parallel with the cutting edge of the flank, and the life of the corner portion 35 of the chip 4 can be detected by measuring the change in resistance due to damage to the sensor line 37. .

In order to perform cutting using the cutting tool in which the tip 4 is attached to the holder 1 described above, the tip 4 is cut while the work material (metal work to be cut) is rotated. The tip holder 1 can be cut into a desired shape by being fed in the side surface direction or the depth direction while being brought into contact with the side surface.

Furthermore, according to the invention, the sensor line 3
It is also possible to send the signal detected by the probe 7 and the probe 7 to the detector in a non-contact manner by using a proximity switch or the like. According to this, the operability of the machine becomes easier, and the signal can be used for milling or the like. This is particularly effective for unmanned processing in which a plurality of chips and chip holders are exchanged under the control of a rotary tool, a controller, and the like to continuously perform various kinds of processing.

In this case, if the proximity switch is embedded in the chip holder 1, wiring outside the holder can be omitted, and there is an advantage that wiring abnormality due to component damage in the wiring portion and the connector portion can be avoided. Further, if a proximity switch is embedded in the tool rest or turret, it is possible to protect the entire wiring from the holder to the detector from the cutting environment, which has the advantage of reducing damage to each component related to the wiring.

On the other hand, if a slip ring is added to the turret, it is possible to easily replace the plurality of chips 4 and the chip holder 1 even if the signal is taken out from the probe 7 by a wire cord.

Further, the electric signal detected by the detector is NC
The tip 4 can be replaced unattended by transmitting it to the operation controller of the lathe or the quick change system.

Further, the detected signal may be interrupted by a machining number counter for managing the tool life, and when an abnormality occurs, product machining may be stopped as a counter signal.

Furthermore, if the detected electric signal is converted into an FM wave or infrared ray, it is possible to detect the signal wirelessly.

[0033]

As described in detail above, according to the tip holder of the present invention, the shape of the tip and the conductivity of the tip can be removed by fitting the probe member having the pair of probes integrated into the pocket of the shank in a detachable manner. Since it is possible to attach probe members according to the circuit pattern of the circuit in combination and to replace only the probes that easily wear out, the chip holder itself can be used for a long period of time.

Further, according to the cutting tool of the present invention, since the probe member having the pair of probes integrated therein is detachably fitted in the pocket of the shank, the throw-away tip having the conductive circuit is attached. Since it is possible to attach probe members according to the shape of the chip and the circuit pattern of the conductive circuit in a combined manner, and it is possible to replace only the probe that is easily consumed, the chip holder itself can be used for a long period of time.

[Brief description of drawings]

FIG. 1 is an exploded perspective view for explaining an example of a tip holder of the present invention.

FIG. 2 is an enlarged view showing a probe member of the present invention.

[Explanation of symbols]

1 Chip holder 2 Turret 3 shank 4 throw-away tip (tip) 5 pockets 6 Conductive circuit 7 probe 8 probe members 9 Through hole (probe hole) 10 wiring lines 11 High hardness material 12 probe holes 13 screw holes 14 Notch 15 Through hole (wiring hole) 17 Probe fixing member 22 Clamp 35 Corner 37 sensor lines

Claims (4)

[Claims] 1. A state in which a pocket for fixing and holding a throw-away tip is formed at the tip of a columnar shank attached to a tool rest, and a probe member in which a pair of probes is integrated can be attached and detached to the pocket. The chip holder is characterized in that a probe hole is formed for fitting so as to project from the pocket. 2. A bottom surface of the pocket has a first through hole for penetrating the probe member and a second through hole for penetrating a screw member, and has a hardness higher than that of the shank. A plate-shaped high-hardness member is provided, the high-hardness member is fixed to the shank through the second through hole, and the second high-hardness member is provided on the surface of the high-hardness member.
The chip holder according to claim 1, wherein the center of the through hole is formed at a position displaced from the center of the high hardness member. 3. The chip according to claim 2, wherein a conductive circuit is formed on at least the surface of the throw-away chip, and a cutout that connects with the first through hole is formed in the high-hardness member. holder. 4. A cutting tool, wherein a throw-away tip provided with a conductive circuit is attached to the pocket of the tip holder according to any one of claims 1 to 3.