JPH08276310A - Face milling cutter - Google Patents

Abstract

PURPOSE: To provide a face milling cutter which can certainly jet pressure fluid from inside of a milling cutter body to the edge. CONSTITUTION: A milling cutter body has a supply passage formed to supply pressure fluid and also forming a jet passage 11 emitting a jet of pressure fluid on a clamp screw 5 fixing a blade tip 19, so that the pressure fluid can be certainly injected from inside of the cutter body 1 to the blade tip 19 and moreover the pressure fluid can be injected directly and certainly from a position near the cutting blade 19 through the clamp screw 5 so as to enable exclusion of scraps, cooling, and lubrication certainly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a face mill which is used at high speed and has a cutting blade detachably attached.

[0002]

2. Description of the Related Art Generally, when performing flat surface machining with a face milling machine, a cutting fluid such as a cutting fluid or compressed air is used during cutting for the purpose of cooling the cutting edge, eliminating chips, and preventing welding of the cutting edge. May be sprayed at.

As a method of ejecting such a pressure fluid toward the cutting edge portion, there is a method of spraying it from the outside of the milling machine with a nozzle. However, since the face milling cutter is rotating at a high speed, the cutting blade is used for spraying with an external nozzle. It is difficult for the pressure fluid supplied to the blade to be blown off by the centrifugal force etc. and not to hit the blade tip. Also, since the cutting position changes depending on where the feed direction of the blade tip changes, it is necessary to change the position of the nozzle that injects the pressure fluid. . Further, when the pressure fluid is ejected from the outside, chips are caught by the rotating cutting blade, which deteriorates the finished surface roughness and causes the cutting blade to be damaged.

On the other hand, for example, Japanese Utility Model Laid-Open No. 62-19
2819 discloses a technique in which a passage for supplying a pressure fluid is provided inside the milling cutter body and the pressure fluid is ejected from the inside of the body to the cutting blade.

[0005]

However, in the technique in which the pressure fluid supply passage is formed inside the milling cutter body, since the injection port of the supply passage is located a predetermined distance away from the blade tip, the pressure fluid is not applied to the blade tip. There is a problem that it is difficult to take.

That is, since it is necessary to attach a throw-away tip or a blade having a brazed cutting edge to the periphery of the main body, because of the blade or the mounting portion,
The formation position of the pressure fluid supply passage or the injection hole is limited, and the distance between the injection hole and the cutting edge cannot be made shorter than a predetermined distance.Therefore, there is a problem that the pressure fluid cannot be reliably applied to the cutting edge. It was

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and provide a face mill capable of reliably injecting a pressure fluid from the inside of the milling cutter body to the cutting edge.

[0008]

In order to achieve the above object, the invention according to claim 1 is a front milling cutter in which a cutting edge is detachably attached to a milling body by tightening a clamp screw. Has a supply passage for supplying a pressure fluid, and the clamp screw has an injection passage communicating with the supply passage for ejecting the pressure fluid toward the cutting edge.

The invention according to claim 2 uses a throw-away tip as a cutting edge.

According to a third aspect of the present invention, the clamp screw is provided with a chamfered portion in which a diameter of the injection passage is gradually widened at a tip portion on the main body side thereof.

According to a fourth aspect of the present invention, in the supply passage formed in the milling machine body, a groove for enlarging the supply passage is formed at a portion where the injection passage is communicated.

[0012]

According to the first aspect of the present invention, the injection passage for supplying the pressure fluid toward the cutting edge is formed in the clamp screw for stopping the cutting edge. It is possible to feed directly to the cutting edge via this clamping screw. Moreover, since the injection hole is formed in the clamp screw for attaching the cutting edge, the pressure fluid can be surely injected to the cutting edge from the position closest to the cutting edge. Moreover, since the pressure fluid can be ejected from the inside to the outside of the main body, chip removal, cooling, lubrication, etc. can be reliably performed.

According to the second aspect of the invention, even when the throw-away tip is used as the cutting edge, as in the first aspect of the invention, the pressure fluid can be reliably applied to the cutting edge from a position close to the cutting edge. Can be jetted.

According to the invention of claim 3, claim 1
In addition to the above invention, since the injection passage formed in the clamp screw has a tapered tip portion that communicates with the supply passage of the milling machine, it has good communication with the supply passage and supplies pressure fluid. It can be smoothly taken into the injection passage from the passage.

According to the invention of claim 4, claim 1
In addition to the invention described in (1), since the portion where the injection passage is formed is enlarged in the supply passage formed in the milling machine, it is easy to take the pressure fluid into the injection passage, and the pressure fluid can be smoothly supplied. it can.

Further, by forming the groove in this way, when the communication passage that connects the injection passage and the supply passage is formed, the communication passage can be easily formed.

[0017]

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

As shown in FIGS. 1 and 2, five blades 2 are arranged at equal intervals on the outer circumference of a steel milling body 1.

The milling body 1 is not limited to steel, but may be made of aluminum alloy, for example. By making the aluminum alloy in this way, it is possible to reduce the weight, which is advantageous in terms of balance.

A wedge member 4 is arranged above the end surface 3 of the blade 2, and the wedge member 4 is fastened to the main body by a clamp screw 5 to fix the cutting edge to the blade 2.

At the center of the milling machine body 1, there is formed a central mounting hole 7 for mounting to the milling arbor 8, and in this central mounting hole 7, a groove 9 is formed along the inner peripheral surface from the central side thereof. It receives the pressure fluid supplied from the milling arbor 8. By forming the groove 9 in this way, the portion communicated with the communication passage is enlarged, so that the pressure fluid can be easily taken into the communication passage 15 and the pressure fluid can be smoothly supplied. Compressed air or lubricating oil is used as the pressure fluid. Further, by forming the groove 9, the communication passage 15
Are easily formed.

That is, as shown in FIGS. 3 and 4, a communication passage 15 is formed in the milling body 1 from the supply passage 13 to the mounting portion of each blade 2, and a pressure is applied to the communication passage 15. Fluid is supplied. 3 and 4 show examples in which a brazed blade type cutting edge 19a and a throw-away tip 19b are used as the cutting edge 19, respectively.

In the embodiment shown in FIG. 4, a tip pocket 17 (see FIG. 2) for receiving cut chips is formed along the outer periphery of the milling body 1 at the mounting portion of each blade 2. The throw-away tip 19b is detachably attached to the tip pocket 17 at a position continuous with the wedge member 4 via the clamp screw 5.

The blade 2 is fixed to the main body 1 by the clamp bolt 10.

As shown in FIG. 5, the wedge member 4 is formed with a taper so that the dimension thereof gradually expands from the insertion side to the outside. By tightening the clamp screw 5, the wedge blade 4 has a wedge effect. 19 is fixed.

An injection passage 11 is formed along the axis of the clamp screw 5, and the clamp screw 5 is communicated with the above-mentioned communication passage 15 to introduce a pressure fluid. The clamp screw 5 has a screw (a pair of screws each having a different direction) formed on the outer peripheral portion W thereof, and usually the wedge member 4 is fastened to the main body 1 with a hexagon wrench or the like.

As shown in FIG. 6, the tip portion 5a of the clamp screw 5 located on the main body 1 side is provided with a tapered chamfered portion 21 in which the diameter of the injection passage 11 is gradually increased. There is. The chamfered portion 21 has good communication with the communication passage 15 of the milling machine body 1, and the pressure fluid can be smoothly taken into the injection passage 11 from the communication passage 15.

Further, in the clamp screw 5, as shown in FIG. 5, the injection port 5b, which is the rear end portion of the injection passage 11, is located at a position close to the cutting edge, and the clamping screw 5 is surely directed toward the cutting edge of the cutting edge 19. To eject the pressure fluid.

In this embodiment, the injection passage 11 extends substantially parallel to the cutting edge 19, but the injection hole 11 may be angled or wedged so as to inject toward the cutting edge of the cutting edge 19. The configuration may be such that the angle of the member 4 is changed.

Next, the operation of this embodiment will be described.

When assembling the face mill, the milling body 1 is attached to the milling arbor 8. The milling body 1 has a throwaway tip 19b as a cutting edge supported by a blade 2, and a wedge member 4 is tightened by a clamp screw 5. And fix the throw-away tip 19b. Since the injection passage 11 is formed along the central axis of the clamp screw 5 and is hollow, it is tightened with a hexagon wrench or the like. As described above, in this embodiment, the clamp screw 5 is tightened in the same manner as the conventional one, and the throw-away tip 19 is tightened.
By simply fixing b, the pressure fluid can be reliably ejected from the position close to the blade tip to the blade tip.

Further, the clamp screw 5 used in this embodiment can be easily made by forming a jet passage 11 by making a hole during tapping.

Not only the clamp screw 5 having the injection passage 11 formed therein is used, but a solid clamp screw having no injection passage 11 formed therein is used. The injection passage 11 may be formed by making a hole in the clamp screw 5 with a drill or the like. In this case, it is desirable to form the communication passage 15 in the milling cutter body at the same time when the injection passage 11 is formed.

At the time of cutting, the pressure fluid supplied from the milling arbor 8 is supplied to the groove 9 from the supply passage 13. By forming the groove 9 in this manner, the pressure fluid can be easily taken into the communication passage 15, and the pressure fluid can be smoothly supplied.

The pressure fluid supplied to the communication passage 15 is supplied to the ejection passage 11 of the clamp screw 5 and ejected from the ejection hole 5b, but the chamfered portion 21 of the ejection passage 11 is formed in a tapered shape. Therefore, it can be smoothly taken into the injection passage 11 from the communication passage 15.

The pressure fluid sprayed from the spray holes is the cutting edge 19
Directly and reliably toward Thereby, cooling of the cutting edge, removal of chips, and welding of the cutting edge can be prevented. Further, since the pressure fluid can be ejected from the inside to the outside of the main body, the chips can be smoothly removed without being bitten.

Since the centrifugal force becomes larger as the aluminum alloy milling cutter body 1 is used at a higher speed, the pressure fluid injected from the injection passage 11 is directed to the opposite side to the rotating direction, so that the cutting edge is more reliable. Will come to rest.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified without departing from the gist of the present invention.

[0039]

According to the first aspect of the present invention, since the injection passage for supplying the pressure fluid toward the cutting edge is formed in the clamp screw, the pressure fluid can be reliably applied from the inside of the milling cutter body to the cutting edge. Can be jetted, and the pressure fluid can be jetted directly and surely from a position close to the cutting edge. Further, since the pressure fluid can be jetted from the inside to the outside of the main body, chip removal, cooling, lubrication and the like can be reliably performed.

According to the second aspect of the invention, even when the throw-away tip is used as the cutting edge, as in the first aspect of the invention, the pressure fluid is surely applied from the inside of the milling cutter to the cutting edge. Can be jetted.

According to the invention of claim 3, claim 1
In addition to the above invention, since the tapered chamfered portion is formed at the tip of the clamp screw, the pressure fluid can be smoothly taken into the injection passage from the supply passage.

According to the invention of claim 4, claim 1
In addition to the above invention, since the groove is formed in the supply passage formed in the milling body, the pressure fluid can be easily taken into the injection passage, and the pressure fluid can be smoothly supplied. Further, by forming the groove in this way, it becomes easy to form a communication passage communicating with the injection passage.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a face mill according to an embodiment of the present invention.

2 is a plan view of the front milling cutter shown in FIG. 1. FIG.

FIG. 3 (a) is a cross-sectional view showing a cutting blade mounting portion in a front milling cutter, and FIG. 3 (b) is a side view of a blade portion.

4A and 4B are views showing a modified example of a cutting blade mounting portion in a front milling cutter, FIG. 4A is a sectional view, and FIG. 4B is a side view of a blade portion.

FIG. 5 is a cross-sectional view showing a tightened state of a wedge member with a clamp screw.

FIG. 6 is a side view of a clamp screw.

[Explanation of symbols]

 1 Milling Machine Body 4 Wedge Member 5 Clamp Screw 9 Groove 11 Injection Passage 13 Supply Passage 19 Cutting Edge

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Riichi Otani 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Nobuyasu Nonaka 2100, Kamiimazumi, Ebina-shi, Kanagawa Hitachi Seiko Co., Ltd. (72) Inventor Etsuomi Kanno 4-13 Toyo, Koto-ku, Tokyo Hitachi Tool Co., Ltd.

Claims (4)

[Claims] 1. A front milling cutter in which a cutting edge is detachably attached to a milling machine body by tightening a clamp screw, wherein a supply passage for supplying a pressure fluid is formed in the milling machine body, and The front milling cutter is characterized in that an injection passage is formed which is in communication with the supply passage and injects the pressure fluid toward the cutting edge. 2. The face milling cutter according to claim 1, wherein the cutting edge is a throw-away tip. 3. The face milling cutter according to claim 1, wherein the clamp screw is provided with a chamfered portion in which a diameter of the injection passage is gradually widened at a tip portion on a main body side thereof. . 4. A groove for enlarging the supply passage is formed in a portion of the supply passage formed in the milling cutter body, the portion being in communication with the injection passage. Face milling machine according to any one of.