JPH0871813A - Cutting tool - Google Patents

Abstract

PURPOSE: To prolong the service life of a cutting tool by segmenting chips short so as to be made into appropriate length not too fine. CONSTITUTION: A cutting tool 1 is provided with a tip 3 for cutting a workpiece 2, and a shank 4 for holding the tip 3; and a cutting edge part 8 for cutting the workpiece 2 is formed at the intersection part of the cutting face 6 and flank relief 7 of the tip 3. In such a cutting tool 1, the tip 3 side part of the shank 4 is provided with a nozzle 13 for jetting coolant to the flank relief 7, and a nozzle 16 for jetting coolant to the cutting face 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting tool used in a machine tool such as a turret lathe, and more particularly to a cutting tool characterized by a coolant (cutting oil) supply structure for a cutting edge.

[0002]

2. Description of the Related Art Conventionally, a cutting tool of this type has been used as a practical tool.
There is one described in Japanese Patent Publication No. 3-30402.

This cutting tool includes a tip for cutting a work piece and a shank for holding the tip. The chip has a rake face and a flank that intersect each other,
At the intersection of these rake face and flank face, there is formed a cutting edge portion for cutting the work by the tip portion. Also,
A cutting oil ejection hole is formed through the shank along the longitudinal direction, and the tip side of the cutting oil ejection hole is
It is used as a tip core hole (first nozzle) for ejecting cutting oil to the flank. The tip core hole is directed to the tip of the blade tip by arranging the virtual hole core (spout hole core) in line with the tip of the blade tip.

When the work is rotated and the tip of the cutting edge is pressed against the work to cut the work with a predetermined cut, the cutting oil supplied to the cutting oil ejection hole is the center hole of the chip. To spray the flank toward the tip of the cutting edge to cool and lubricate the cutting edge during cutting, and to remove spiral wound chips generated on the rake face side of the cutting edge during cutting. ing.

[0005]

However, in the above-mentioned conventional cutting tool, it has been confirmed by experiments that when the cutting oil is jetted from the tip centering hole to the flank, the chips do not easily break and extend for a long time. It is If the chips grow long, chipping will occur when the chips hit the cutting tool during cutting, and the cutting oil will not get well on the cutting tool, which will cause the cutting tool to heat up due to frictional heat due to insufficient cooling. Therefore, the life of the cutting tool is shortened.

The present invention has been made in order to solve the above problems, and an object of the present invention is to extend the life of a cutting tool by cutting chips into short pieces having an appropriate length that is not too fine. .

[0007]

In order to achieve the above object, the present invention comprises, as described in claim 1, a chip for cutting a work piece and a shank for holding the chip, and In a cutting tool in which a cutting edge portion for cutting the work is formed at an intersection of a rake face and a flank, a nozzle for ejecting a coolant to the flank, and a coolant for the rake face in a portion of the shank on the tip side. And a nozzle for ejecting to the nozzle, and as described in claim 2, the two nozzles are respectively directed to the tip end portion of the cutting edge portion, and further as described in claim 3. In the shank, there is formed a channel extending to the tip side for communicating a coolant supply means with each of the two nozzles. Further, as described in claim 4, The adapter is attached to the outside of the shank, at least of the two nozzles to the adapter is provided with a one nozzle.

[0008]

According to the structure of the first aspect, while the coolant is jetted from the jet holes of the two nozzles to the flank and the rake face, respectively, the work is cut by the cutting edge portion and chips are cut on the rake face side. generate. At this time, the jet flow of the coolant jetted to the flank hits the contact portion between the blade tip and the work, the coolant enters the contact portion, and the blade tip is cooled by the coolant from the flank side and lubricated. At the same time, the chips are cooled by the invading coolant. Further, the jet flow of the coolant sprayed on the rake face hits the cutting edge and chips, and the cutting edge is cooled and lubricated by the coolant from the rake face side, and the chips are cooled by the coolant from the rake face side and the coolant. Is separated and removed by the jet flow of.

According to the second aspect of the invention, the coolant flow jetted to the flank face is directly applied to the contact portion between the cutting edge portion and the work, and is jetted to the rake face. The jet flow of is directly applied to the cutting edge and the chips to more reliably cool and lubricate the cutting edge and to cool and cut off the cutting.

Further, according to the structure of the third aspect, the two nozzles are brought close to the blade edge portion by the flow passage in the shank, and the jet flows of the coolant are respectively applied to the aimed positions, and the contact is made. Make stronger

Further, according to the structure described in claim 4, the position of the nozzle is appropriately set with respect to the position of the flow path in the shank by the adapter, and the angle of the ejection hole core of the nozzle is adjusted, Apply the jet of coolant to the target position.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 (1) is a plan view showing a partial sectional state of a cutting tool according to an embodiment of the present invention, (2) is a front view of (1), and FIG. 2 is an invention in comparison with a conventional example. It is a figure which shows the state of the chip which shows the effect of.

In FIG. 1, reference numeral 1 denotes a cutting tool mounted on a turret head or the like. The cutting tool 1 includes a tip 3 for cutting a work 2 and a shank 4 for holding the tip 3.
It has and.

A rake face 6 and a flank face 7 are formed on the tip 3 so as to intersect with each other. At the intersection of the rake face 6 and the flank face 7, a cutting edge portion 8 for cutting the work 2 by a tip portion 8a. Are formed.

In the shank 4, a communication hole 9a having one end opened to the side opposite to the chip 3 side is formed so as to extend toward the chip 3 side, and one end side is formed at the extending end of the communication hole 9a. The other ends of communication holes 9b and 9c, which communicate with a first nozzle 13 and a second nozzle 16 which will be described later, are connected to each other. A connection port 10 for connecting the coolant supply means is provided at the open end of the communication hole 9a. Thus, the coolant supply means is provided in the shank 4 with the two nozzles 13 and 1.
A flow path 9 is provided to communicate with each of the six.

On the outside of the shank 4, an adapter 11 is mounted on the flank 7 side, and a columnar portion 12 is provided on the rake face 6 side so as to project.

The adapter 11 has a nozzle 13 (hereinafter referred to as the first nozzle 1) for ejecting a coolant to the flank 7.
3), and one end of the ejection hole 13a of the first nozzle 13
And a communication hole 14 that communicates with.

The other end of the communication hole 14 is extended and opened to the mounting surface 11a of the adapter 11. The mounting surface 11
An annular seal member 15 surrounding the open end of the communication hole 14 is provided in a, and the seal member 15 connects the communication hole 9b and the communication hole 14 between the shank 4 and the adapter 11. The part is sealed.

The first nozzle 13 is directed to the tip portion 5a of the cutting edge portion 5 by arranging the ejection hole core X on the same straight line as the tip portion 5a of the cutting edge portion 5.

Further, the columnar portion 12 of the shank 4 includes
A nozzle 16 (hereinafter referred to as a second nozzle 16) different from the first nozzle 13 for ejecting a coolant onto the rake face 6 is formed, and the communication hole 9c is communicated with the ejection hole 16a of the second nozzle 16. are doing.

The second nozzle 16 is directed to the tip portion 8a of the cutting edge portion 8 by arranging the ejection hole core Y on the same straight line as the tip portion 8a of the cutting edge portion 8.

According to the above construction, the coolant is supplied from the coolant supply means to the first nozzle 13 and the second nozzle 16 through the connection port 10 and the flow passage 9, respectively, and the first nozzle 1
3, the work piece 2 is cut by the tip portion 8a of the cutting edge portion 8 while ejecting the coolant from the ejection hole 13a of the third nozzle 16 and the ejection hole 16a of the second nozzle 16, and the rake face 6 of the cutting edge portion 8 is cut.
Generate chips on the side.

At this time, the jet flow of the coolant jetted to the flank surface 7 directly hits the abutting portion between the tip portion 8a of the blade tip portion 8 and the work 2, the coolant penetrates into the abutting portion, and the blade tip portion 8 Is cooled by a coolant from the flank surface 7 side and lubricated. Further, the chips are cooled by the invading coolant. In addition, the ejection hole 16 of the second nozzle 16
The jet flow of the coolant ejected from the a to the rake face 6 hits the tip 8a of the cutting edge portion 8 and chips, and the cutting edge 8 is cooled and lubricated from the rake face 6 side by the coolant, and the cutting chips 6 Cooled by coolant from the side and removed by jet of coolant.

As described above, the chips are cooled in two stages by the coolant ejected from the first nozzle 13 to the flank 7 and the coolant ejected from the second nozzle 16 to the rake face 6, and the chips are Probably because the coolant jet from the second nozzle 16 is applied, the chips are cut into short pieces and have an appropriate length that is not too fine. FIG. 2 shows a state in which such chips are divided. From this figure, the cutting speed is 100m / min, 150m / min, 200m / min,
It can be seen that in any case of 300 m / min, unlike the conventional case, the chips are cut into short pieces and have an appropriate length.

Further, the first nozzle 13 and the second nozzle 16 are brought close to the cutting edge portion 8 by the flow passage 9 in the shank 4,
The jet flow of the coolant is applied to a target position and the contact is strengthened, so that the cooling and lubrication of the cutting edge portion 8 and the cooling and cutting of chips are more effectively performed.

Further, the first nozzle 13 and the second nozzle 16 are separated from the cutting edge portion 8 so that the nozzles 13 and 16 do not interfere with the machining unlike the piping nozzles used in the conventional drilling. Nozzles 13 and 1 for hitting chips
The spout hole cores X and Y of No. 6 are not disturbed.

Further, the position of the first nozzle 13 is appropriately set with respect to the position of the flow passage 9 in the shank 4 by the adapter 11, and the angle of the ejection hole core X of the nozzle 13 is adjusted to eject the coolant. Hit the target position.

In the above embodiment, the coolant supply means is connected to the first nozzle 13 and the second nozzle 16 via the flow passage 9 in the shank 4, respectively. However, a flexible hose or the like is connected to the two nozzles 13 and 16. The coolant supply means may be connected via.

Further, the first nozzle 13 is installed on the adapter 11 mounted on the outside of the shank 4, and the second nozzle 16 is provided on the columnar portion 12 protruding on the outside of the shank 4. An adapter may be used for the installation of 16.

Further, although the first nozzle 13 and the second nozzle 16 are provided separately, the first nozzle 13 and the second nozzle 1 are provided.
It goes without saying that 6 may be provided integrally with each other.

[0032]

As described above, according to the present invention, as described in claim 1, the chip for cutting the work and the shank for holding the chip are provided, and the intersection of the rake face and the flank of the chip is provided. In a cutting tool having a cutting edge portion for cutting the work, in the tip side portion of the shank, a nozzle for ejecting coolant to the flank surface,
Since the nozzle for ejecting coolant to the rake face is provided, when ejecting the coolant from the ejection holes of the two nozzles, respectively, and ejecting the coolant to the flank when the workpiece is cut by the tip of the cutting edge. Applying a flow to the contact area between the cutting edge and the work, injecting coolant into the contact area, cooling the cutting edge from the flank side with the coolant, and at the same time lubricating, and cooling with the coolant in which the chips have penetrated. You can Also, hit the cutting edge and chips with the jet of coolant sprayed on the rake face,
Cools and lubricates the cutting edge part from the rake face side with a coolant, and at the same time cools chips from the rake face side with a coolant and cuts into a suitable length that is not too fine due to the jet flow of the coolant and can be removed. . Therefore,
Since it prevents chipping phenomenon and improves the effect of the coolant on the cutting tool, it can perform sufficient cooling,
The life of the cutting tool can be extended.

Further, according to the present invention, as described in claim 2, since the two nozzles are respectively directed to the blade tip portion, the jet flow of the coolant jetted to the flank is directed to the tip portion of the blade tip portion and the workpiece. Directly against the contact area with the rake face, and by directly applying the coolant flow ejected to the rake face to the cutting edge and chips, cooling and lubrication of the cutting edge and cooling and cutting of chips can be performed more reliably. Can be something.

Further, according to the present invention, as described in claim 3, the coolant supply means is provided in the shank.
Since the flow paths for communicating with the respective nozzles are formed, it is possible to bring the nozzles closer to the blade edge portion by the flow paths in the shank, to hit the jets of the coolant at the respective aimed positions, and to strengthen the hit. Therefore, it is possible to effectively cool and lubricate the cutting edge portion and cool and cut off the chips.

Further, according to the present invention, as described in claim 4, since the adapter is attached to the outside of the shank and the adapter is provided with at least one nozzle of the two nozzles, the inside of the shank is adjusted by the adapter. It is possible to appropriately set the position of the nozzle with respect to the position of the flow path, adjust the angle of the ejection hole core of the nozzle, and apply the ejection flow of the coolant to the aimed position. Therefore, the cooling and lubrication of the cutting edge portion and the cooling and cutting of chips can be performed more effectively.

[Brief description of drawings]

FIG. 1 is a plan view showing a partial sectional state of a cutting tool according to an embodiment of the present invention. (2) It is a front view showing a partial cross-sectional state of the cutting tool.

FIG. 2 is a diagram showing a state of chips showing an effect of the invention in comparison with a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cutting tool 2 Work piece 3 Tip 4 Shank 6 Rake surface 7 Flank surface 8 Cutting edge portion 8a Tip portion 9 Flow path 11 Adapter 13 First nozzle (Nozzle) 13a Jet hole 16 Second nozzle (Nozzle) 16a Jet hole

Claims (4)

[Claims] 1. A cutting tool comprising a tip for cutting a work piece and a shank for holding the tip, wherein a cutting edge portion for cutting the work piece is formed at an intersection of a rake face and a flank face of the tip. At the tip side of the shank, a nozzle for ejecting coolant to the flank,
A cutting tool provided with a nozzle for ejecting a coolant onto the rake face. 2. The cutting tool according to claim 1, wherein each of the two nozzles is directed toward the tip of the cutting edge. 3. The cutting tool according to claim 1, wherein a flow path is formed in the shank for connecting a coolant supply means to each of the two nozzles. 4. The cutting tool according to claim 2, wherein an adapter is attached to the outside of the shank, and the adapter is provided with at least one nozzle of the two nozzles.