JP2005262348A - Rotary cutter body and boring method by rotary cutter body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary cutter body and a boring method by the rotary cutter body, for improving the service life of the rotary cutter body, by minimizing edge abrasion by intense heat generated in rotational processing of the rotary cutter body, by increasing the cooling effect of the rotary cutter body by a cutting liquid. <P>SOLUTION: This rotary cutter body A has a shank 1 in one side part, and has a blade body 2 in the other side part. A sending-in hole 3 of the cutting liquid is arranged in an outside end part of the shank. A flow passage 4 of the cutting liquid in the longitudinal direction of a rotary shaft, is bored inside the shank and the blade body by connecting with the sending-in hole. A groove delivery hole 5 is opened in one place or a plurality of places to be jetted in a groove in the groove 6 in the blade body by connecting with the flow passage. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention can increase the cooling effect of the rotary blade object by the cutting fluid, suppress the wear of the blade edge due to high heat generated during the rotary machining of the rotary blade object as much as possible, and improve the life of the rotary blade object. The present invention relates to a rotary blade object and a drilling method using a rotary blade object.

  Conventionally, as a technique for improving the life of a cutting tool, it is known to provide an oil hole for ejecting a cutting fluid on the tip flank (see, for example, Patent Document 1).

JP 2002-52410 A

This is formed with an oil hole for supplying a cutting fluid from the proximal end of the cutting tool toward the distal end side.
However, since this cutting tool has a configuration in which an oil hole is provided in the flank of the tip, the cooling and lubricating action by the cutting fluid is exclusively the tip at that time in contact with the workpiece. The cutting tool, for example, the groove of the drill is hardly cooled or lubricated by the above-described cutting fluid, and the chips passing through the groove are heated up and welded to the groove or the peripheral cutting edge. The drill could not be used in a short time.

  In particular, as shown in FIG. 7, when the drill hole 60 provided in the flank 61 reaches the other side of the workpiece 63 (before penetrating the workpiece 63), as shown in FIG. At this time, the cutting fluid is diffused to the outside of the workpiece 63, and not only the workpiece 63 but also the drill 60 is not affected by the cutting fluid. In this state, as shown in FIG. When the uncut portion X of the workpiece 63 is cut, there is a problem that chips of the uncut portion X are welded to a groove portion, an outer peripheral cutting edge, or the like of the drill 60.

  The present invention has been made in order to solve the above-described problems, and is a rotary blade object having a shank on one side and a blade on the other side, and a cutting fluid at the outer end of the shank. A cutting fluid flow passage is formed in the shank and the blade body in the longitudinal direction of the rotating shaft and connected to the flow passage, and is connected to the flow passage to form a groove in the blade body. In addition, the cooling effect of the rotary blade object by the cutting fluid is increased by opening the groove discharge hole at one or a plurality of locations to be ejected into the groove, and the high heat generated during the rotary machining of the rotary blade object An object of the present invention is to provide a rotating blade object and a drilling method using the rotating blade object that can suppress the wear of the blade edge as much as possible and improve the life of the rotating blade object.

The present invention for achieving the above-described object is as follows.
In a rotary blade object having a shank on one side and a blade on the other side,
The cutting fluid feed hole opened at the outer end of the shank, and the flow of the cutting fluid connected to the feed hole and drilled in the longitudinal direction of the rotating shaft inside the shank and the blade body The rotary blade object is configured to include a channel and a groove in the blade body connected to the flow path and a groove discharge hole opened at one or a plurality of locations to be ejected into the groove.

And
In a rotary blade object having a shank on one side and a blade having a twist angle on the other side,
The cutting fluid feed hole opened at the outer end of the shank, and the flow of the cutting fluid connected to the feed hole and drilled in the longitudinal direction of the rotating shaft inside the shank and the blade body A groove and a groove discharge hole which is connected to the flow path and is opened at one or a plurality of places in the groove in the blade body,
The flow passage has a configuration of a rotary blade object formed along a twist of a twist angle of the blade body.

Also,
A rotary blade object having a blade having a shank on one side and a twist angle on the other side,
The cutting fluid feed hole opened at the outer end of the shank, the tip discharge hole drilled in the cutting edge surface of the blade body at the front end of the blade body, the tip discharge hole and the feed hole A flow passage of the cutting fluid connected to a hole and drilled in the longitudinal direction of the rotary shaft inside the shank and the blade body, a sub-flow passage branched in the middle of the flow passage, and the sub-flow The groove in the blade body connected to the path, provided with a groove discharge hole opened in one or a plurality of locations to be ejected into the groove,
The flow passage has a configuration of a rotary blade object formed along a twist of a twist angle of the blade body.

  The groove discharge hole provided in the groove is provided so as to eject the cutting fluid toward a surface of the blade body that is easy to cut at the outer periphery.

And
In a rotary blade object having a shank on one side and a blade on the other side,
A flow path for cutting fluid is formed in the shank and the blade body in the longitudinal direction of the rotating shaft, and from the groove discharge hole opened in the groove in the blade body connected to the flow path, There is a drilling method using a rotary blade object that drills a workpiece while ejecting the cutting fluid toward a surface that is easy to cut the outer periphery.

  The present invention increases the cooling effect of the rotary blade object by the cutting fluid, suppresses the wear of the blade edge due to high heat generated during the rotary machining of the rotary blade object as much as possible, improves the life of the rotary blade object, The processing accuracy and processing efficiency for the workpiece can be increased.

Next, an embodiment of a rotating blade object and a drilling method using the rotating blade object according to the present invention will be described with reference to the drawings.
1 to 6, A is a rotary blade object in the embodiment of the present invention, for example, a drill, a reamer, an end mill, etc. for drilling a workpiece, and a processing machine on one side. It has a shank 1 that is detachably attached to a rotating shaft of a main body (not shown), and has a blade body 2 formed integrally with the shank 1 on the other side of the shank 1. 3, a flow passage 4, and a groove discharge hole 5.
1 to 3 show a rotary blade object A that is a drill having a twist angle θ of a predetermined angle (for example, 5 ° to 60 °), and FIGS. 4 to 5 show the rotary blade object A that is a reamer. FIG. 6 shows a rotary blade object A, which is a step drill, as an example. The rotary blade object A is made of cemented carbide or the like.

  And the above-mentioned feed hole 3 is provided so that it may open in the outer-end part in the longitudinal direction of the rotating shaft of the shank 1, and in the case of the drilling process with respect to a workpiece, a rotary blade object A or a workpiece It serves as an inlet for the cutting fluid used for cooling or lubricating the cutting waste. The feed hole 3 may be an outer peripheral portion of the outer end of the shank 1 as long as it is an end portion of the shank 1, and has a configuration in which cutting fluid can be introduced into the flow passage 4 described later.

The flow passage 4 described above is connected in communication with the feed hole 3 and narrows in the longitudinal direction of the rotating shaft (the rotating shaft center on which the rotating blade object A rotates) inside the shank 1 and the blade body 2. The cutting fluid introduced in the hole 3 is circulated through the hole 3.
In the case of a rotary blade object A using a drill as shown in FIGS. 1 to 3 and 6, the flow passage 4 is formed in the blade body 2 along the twisted shape of the twist angle θ formed in the blade body 2. It is made to pierce in a part (a state where the part other than the groove discharge hole 5 is not exposed from the outer surface of the blade body 2).

The groove discharge hole 5 is connected to the flow passage 4 and ejects the cutting fluid into the groove 6 in the blade body 2 into the groove 6. In the blade body 2, the longitudinal direction of the rotation axis of the blade body 2 On the other hand, it is opened at one place or a plurality of places.
The groove discharge hole 5 provided in the groove 6 is provided so that the cutting fluid is ejected in a high pressure state toward the surface 8 which is easy to be the outer peripheral cutting edge 7 in the blade body 2.
In the case of the rotary blade object A by a drill, the groove 6 described above is formed along the twist angle θ formed in the blade body 2, and the rotary blade object A which is a reamer shown in FIGS. In this case, the blade body 2 is formed along the longitudinal direction of the rotation axis, and the blade body 2 has a shape with a predetermined depth.

In the example of the embodiment of the present invention, as shown in an enlarged view in FIG. 3, a front discharge hole 9 is formed in the cutting edge surface (flank) 11 of the blade body 2 at the front end portion of the blade body 2. Then, the flow passage 4 is connected to the tip discharge hole 9 and the feed hole 3 in the longitudinal direction of the rotating shaft inside the shank 1 and the blade body 2, and the blade 2 is placed in the middle of the flow passage 4. The subflow passage 10 is branched at one or a plurality of locations, and the groove discharge holes 5 provided in the groove 6 are connected to each of the subflow passages 10. The downstream end portion of the so-called subflow passage 10 becomes a groove discharge hole 5 in the groove 6.
That is, by providing this subflow passage 10, the groove discharge holes 5 can be provided at a plurality of locations at intervals with respect to the longitudinal direction of the rotating shaft of the blade body 2. Accordingly, the mounting position and the number of the groove discharge holes 5 in the blade body 2 are appropriately designed.

  The rotary blade object A and the drilling method using the rotary blade object A according to one embodiment of the present invention configured as described above have the following actions. In this embodiment, FIG. The drill type rotary blade object A shown in FIG.

The shank 1 of the rotary blade object A is attached to the rotating shaft (not shown) of the processing machine, and the cutting fluid is ejected from the feed hole 3 of the shank 1 with a predetermined pressure (for example, 20 to 60 kg / cm ² ). The rotating shaft is rotated.
And if the front-end | tip part of the blade body 2 is cut | disconnected with respect to a workpiece (not shown), it will provide in the cutting-blade surface (flank) 11 in the front-end | tip part of the blade body 2 via the flow path 4. The cutting fluid is ejected from the tip discharge hole 9 and the groove discharge hole 5, and the blade body 2 starts processing the workpiece.

  Therefore, the chips of the workpiece are cooled by the cutting fluid, and the heating generated during the cutting is suppressed, and the blade body 2 is free from uneven wear due to the cooling and lubricating action of the cutting fluid. Drilling proceeds while maintaining stable straight cutting.

  When the blade body 2 enters the hole in the workpiece, the cutting fluid ejected from the groove discharge hole 5 opened in the groove 6 in the blade body 2 through the flow passage 4 and the auxiliary flow passage 10 is The space formed in the hole and groove 6 of the workpiece is filled, and further, the chips of the workpiece discharged using the groove 6 of the blade body 2 as a flow guide are cooled, and the chips are retained. This reduces the heat that is generated and suppresses the phenomenon of high temperatures due to cutting friction, thereby preventing seizure (welding) to the outer peripheral cutting edge 7 or the like. Moreover, wear and deterioration of the blade body 2 due to high heat can be prevented by cooling and lubricating action of the cutting fluid.

In particular, since the groove discharge hole 5 makes a hole in the work piece while ejecting the cutting fluid toward the surface 8 of the blade body 2 which is easy to be the outer peripheral cutting edge 7, the cutting fluid is efficiently removed. The outer peripheral cutting edge 7 that directly hits the processed surface of the workpiece is sprayed on the surface 8 that is easy to obtain, and the cooling / lubricating effect by the cutting fluid can be obtained.
In addition, since the cutting fluid is filled into the groove 6 of the blade body 2 by the ejection of the cutting fluid from the groove discharge hole 5, the action of pushing out the chips to be stagnated in the groove 6 also works. Smooth chip discharge is achieved.

  In addition, although it is preferable to provide the groove discharge hole 5 so that the said cutting fluid is ejected toward the surface 8 which the outer peripheral cutting edge 7 in the blade body 2 is easy to do, any position in the groove | channel 6 of the blade body 2 is provided. If it is provided so as to correspond to the above, an effect of cooling / lubricating action by cutting fluid and a smooth chip discharging effect can be expected.

  In the above embodiment, the action of the combined use with the tip discharge hole 9 provided in the cutting edge surface (flank) 11 is described. However, the groove in which the tip discharge hole 9 is not provided in the cutting edge surface (flank) 11. The case of the rotary blade object A configured only by the discharge holes 5 is also included in the present invention.

It is a front view which shows one Example of the rotary blade object (drill) which employ | adopted the drilling method by the rotary blade object regarding this invention. It is a bottom view which shows the rotary blade object in FIG. It is the front view which expanded a part which expanded and shows the principal part of the rotary blade object in FIG. It is a front view which shows the other example (reamer) of the rotary blade object in FIG. It is sectional drawing which expands and shows the principal part of the rotary blade object in FIG. It is a front view of the principal part which shows the other example (step drill) of the rotary blade object in FIG. It is explanatory drawing which shows the cutting state of the workpiece by the conventional drill.

Explanation of symbols

  A ... Rotary blade object. 1 ... Shank. 2 ... Blade. 3 ... Inlet hole. 4. Flow path. 5: Groove discharge hole. 6 ... groove. θ ... Torsion angle. 9: Tip discharge hole. 10 ... side flow passage.

Claims (5)

In a rotary blade object having a shank on one side and a blade on the other side,
The cutting fluid feed hole opened at the outer end of the shank, and the flow of the cutting fluid connected to the feed hole and drilled in the longitudinal direction of the rotating shaft inside the shank and the blade body A rotary blade object comprising: a path; and a groove discharge hole which is connected to the flow passage and is opened at one or a plurality of locations in the groove of the blade body to be ejected into the groove. In a rotary blade object having a shank on one side and a blade having a twist angle on the other side,
The cutting fluid feed hole opened at the outer end of the shank, and the flow of the cutting fluid connected to the feed hole and drilled in the longitudinal direction of the rotating shaft inside the shank and the blade body A groove and a groove discharge hole which is connected to the flow path and is opened at one or a plurality of places in the groove in the blade body,
The rotary blade object according to claim 1, wherein the flow passage is formed along a twist of a twist angle of the blade body. In a rotary blade object having a shank on one side and a blade having a twist angle on the other side,
The cutting fluid feed hole opened at the outer end of the shank, the tip discharge hole drilled in the cutting edge surface of the blade body at the front end of the blade body, the tip discharge hole and the feed hole A flow passage of the cutting fluid connected to a hole and drilled in the longitudinal direction of the rotary shaft inside the shank and the blade body, a sub-flow passage branched in the middle of the flow passage, and the sub-flow The groove in the blade body connected to the path, provided with a groove discharge hole opened in one or a plurality of locations to be ejected into the groove,
The rotary blade object according to claim 1, wherein the flow passage is formed along a twist of a twist angle of the blade body.   The rotary blade object according to claim 1, 2 or 3, wherein the groove discharge hole provided in the groove is provided so as to eject the cutting fluid toward a surface of the blade body which is easily cut at the outer periphery. In a rotary blade object having a shank on one side and a blade on the other side,
A flow path for cutting fluid is formed in the shank and the blade body in the longitudinal direction of the rotating shaft, and from the groove discharge hole opened in the groove in the blade body connected to the flow path, A drilling method using a rotating blade object, wherein a hole is drilled in a work piece while jetting the cutting fluid toward a surface where the outer peripheral cutting edge is easy to cut.

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