JP2006102868A - Cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cutting device for efficiently supplying a sufficient cutting fluid to a tip portion of a cutting tool and a workpiece.
SOLUTION: A work piece 3 to be drilled is provided with a bush plate adjacent thereto, and the entire guide bush 2 for positioning a drill 6 is inserted into the bush plate. . The guide bush 2 is formed with a supply passage 15 having predetermined inclination angles α and γ that communicates with the insertion passage 13 of the drill 6, and the cutting fluid supplied to the supply passage 15 is Since the fluid flows while being held in the drill groove 20 of the drill 6 that rotates in the insertion passage 13 through the supply passage 15, sufficient cutting fluid is supplied to the tip 22 of the drill 6 and the workpiece, It can be lubricated and cooled.
[Selection] Figure 2

Description

  The present invention relates to a cutting apparatus that supplies a cutting fluid to a cutting tool and a workpiece when a workpiece is drilled using a cutting tool having one end mounted on a rotary spindle. The present invention relates to a cutting apparatus for making a hole in a workpiece by making a guide bush for positioning the workpiece close to the workpiece and inserting a cutting tool into the guide bush.

Conventionally, a method of supplying a cutting fluid when drilling a workpiece will be described with reference to FIG.
As shown in FIG. 7, the bush plate 1 is disposed close to the workpiece 3. The substantially cylindrical guide bush 2 is inserted and supported by the bush plate 1 as a whole. Then, after positioning the drill 6 having one end mounted on the rotary spindle 4 through the insertion passage 13 of the guide bush 2, the rotary spindle 4 is rotated to drill the workpiece 3.
Therefore, when supplying the cutting fluid, the nozzle portion 7a attached to the leading end of the introduction pipe 7 connected to a cutting fluid supply device (not shown) is arranged near the inlet 13b of the insertion passage 13 of the guide bush 2. The cutting fluid was sprayed from the nozzle portion 7 a of the introduction tube 7 toward the end portion of the drill 6.

However, as described above, when the cutting fluid is sprayed to the end portion of the drill, the cutting fluid is blown around by centrifugal force due to rotation of the drill, and the cutting fluid is not supplied to the cutting edge of the drill and the work piece. The drill was damaged due to abnormal friction, and the drill life was shortened. Therefore, the replacement of the drill is frequent and the number of replacement man-hours is increased, and the cost required for exchanging the drill is increased, resulting in high product cost.
In addition, if the cutting fluid is not supplied to the drill tip and workpiece, a component tip is generated at the drill tip, resulting in processing failures such as large hole diameter, poor surface roughness, poor roundness, and burrs. . Furthermore, when the cutting tool is a reamer, the hole diameter varies, resulting in problems such as increased product defects.

  Further, as a prior art of a cutting apparatus, for example, Patent Document 1 discloses a deep hole drilling apparatus configured by integrating a BTA drill method and an ejector drill method, which are means for processing a deep hole having a small diameter. ing. That is, this deep hole drilling device supplies a double pipe having a drill head at the tip, a feed section that feeds the double pipe toward the work, and supplies cutting oil around the double pipe adjacent to the work. A pressure unit, and pumps the cutting oil from the pressure unit and supplies the cutting oil to the drill head through the inside of the seal bush, and returns the chips and the cutting oil through the center hole of the double pipe. Further, a cutting oil supply unit having an ejector function is provided in the feed unit, the cutting oil is supplied from the cutting supply unit, and a part of the cutting oil is supplied to the outer pipe of the double pipe A deep hole drilling device configured to cause the remaining cutting oil to flow into the inner pipe of the double pipe, cause an ejector effect by this flow, and suck the chips together with the cutting oil is disclosed.

JP-A-9-174316

  However, in the invention of Patent Document 1, the cutting oil is supplied around the double pipe from the pressurizing unit, and is supplied to the drill head through the inside of the seal bush. Since the oil supply position is distant, it is difficult to efficiently pump the cutting oil to the workpiece and the drill head. In addition, since the cutting oil flows along the outer peripheral surface of the outer tube of the double pipe, when the seal bush and the workpiece are separated from each other, the cutting oil is interposed between the outer peripheral surfaces of the outer pipe of the double pipe. May splatter around and the cutting fluid may not be supplied to the workpiece and the drill head.

  This invention is made | formed in view of this point, and it aims at providing the cutting device which supplies sufficient cutting fluid efficiently to the front-end | tip part and workpiece of a cutting tool.

As a means for solving the above-mentioned problems, the present invention provides a cutting apparatus having a guide bush for positioning a cutting tool held on a rotary spindle with respect to a workpiece. The guide bush is provided with an insertion path for the cutting tool and a supply path that communicates with the insertion path and supplies cutting fluid into the insertion path.
The invention described in claim 2 is the invention described in claim 1, wherein the cutting tool is a drill, and an inclination angle of the supply path with respect to the insertion path, and an inclination of an axis of the drill and a drill groove. The angles are substantially the same.
The invention described in claim 3 is the invention described in claim 2, wherein the supply path is in a substantially tangential direction of an inner circumferential surface formed in a substantially circular shape of the insertion path from the inflow port, and It is characterized in that it is formed inclined along the rotation direction of the drill.

Therefore, in the first aspect of the present invention, the cutting fluid pumped to the supply path flows from the supply path toward the insertion path through which the cutting tool is inserted, reaches the inside of the insertion path, and then is substantially in the middle of the cutting tool. The tip of the cutting tool and the workpiece are reached while being entangled with the outer peripheral surface from the portion, and each of the tip of the cutting tool and the workpiece is lubricated and cooled.
In the invention described in claim 2, the cutting fluid injected from the outlet of the supply passage into the insertion passage easily flows into the drill groove, and the amount of cutting fluid supplied to the drill groove increases, The cutting fluid held in the drill groove as it rotates effectively reaches the tip of the drill and the workpiece.
In the invention described in claim 3, since the drill groove of the rotating drill can be positioned on the extended line of the outlet of the supply passage, the cutting fluid injected into the insertion passage from the outlet is the drill groove. The amount of cutting fluid supplied to the drill groove is further increased.

  ADVANTAGE OF THE INVENTION According to this invention, the cutting device which supplies sufficient cutting fluid efficiently to the front-end | tip part and workpiece of a cutting tool can be provided.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to FIGS. The same members and corresponding parts as in the conventional example will be described using the same reference numerals.
First, a cutting apparatus according to a first embodiment of the present invention will be described with reference to FIGS.
A bush plate 1 is disposed close to the workpiece 3 to be drilled. The guide bush 2 for positioning the drill (cutting tool) 6 is entirely inserted and supported in the bush plate 1.
Further, one end of the drill 6 is engaged with the rotary spindle 4 and is held by the drill holding portion 5.

The guide bush 2 is formed in a substantially cylindrical shape having an insertion passage 13 through which the drill 6 is inserted. The guide bush 2 has substantially the same length as the thickness of the bush plate 1, and a small diameter portion 11 is provided on the workpiece 3 side, and a large diameter portion 10 is provided on the opposite side to the workpiece 3 side. Yes. A supply passage 15 that communicates with the insertion passage 13 and supplies cutting fluid into the insertion passage 13 is formed in the large diameter portion 10. The inlet 16 of the supply passage 15 is formed on the outer side surface 19 of the large-diameter portion 10 that is substantially flush with the one side surface 29 of the bush plate 1. In addition, the supply path 15 is formed to be inclined from the inlet 16 toward the insertion path 13 in the cross-sectional view shown in FIG. 2B, and the inclination angle α with respect to the insertion path 13 is the axis of the drill groove 20. The inclination angle β with respect to the center 21 is set to be substantially the same. Further, in the side view shown in FIG. 2A, the supply path 15 is formed in the direction of rotation of the drill 6 (clockwise) from the inflow port 16 in a direction substantially tangential to the inner peripheral surface 13 a formed in a substantially circular shape of the insertion path 13. It is formed toward the insertion path 13 with an inclination (inclination angle γ) in the circumferential direction. Further, the outlet 18 of the supply passage 15 formed at the above-described inclination angles α and γ is formed on the inner peripheral surface 13a of the insertion passage 13 within the range where the large diameter portion 10 is formed.
Reference numeral 30 denotes a notch for positioning the guide bush 2 to the bush plate 1.

Next, the flow of the cutting fluid in the cutting apparatus according to the first embodiment of the present invention will be described.
First, the entire guide bush 2 is inserted into the bush plate 1 disposed close to the workpiece 3 to support the guide bush 2. Then, the drill 6 is inserted into the insertion passage 13 of the guide bush 2 and positioned with respect to the workpiece 3.
Next, the nozzle portion 7 a at the tip of the introduction pipe 7 connected to the cutting fluid supply device is inserted into the inlet 16 of the supply passage 15, and the drill 6 is rotated by the rotary spindle 4 to make a hole in the workpiece 3. Simultaneously with the machining, the cutting fluid is pumped into the supply path 15 through the nozzle portion 7a.
Then, the cutting fluid passes through the supply passage 15, is injected from the outlet 18 into the insertion passage 13, and reaches the tip 22 of the drill 6 while being entangled along the drill groove 20 of the drill 6. In particular, at the moment when the drill groove 20 of the rotating drill 6 is positioned on the extended line of the outlet 18 and the supply path 15 and the drill groove 20 overlap, the cutting fluid is sprayed along the drill groove 20. Therefore, the cutting fluid reaches the tip 22 of the drill 6 and the workpiece 3 while being held in the drill groove 20, and is lubricated and cooled.

As described above, according to the cutting apparatus according to the first embodiment of the present invention, the guide bush 2 disposed close to the workpiece 3 has a predetermined inclination (inclination angles α and γ). When the cutting fluid is pumped into the supply passage 15, the cutting fluid flows while being held in the drill groove 20 of the drill 6 rotating in the insertion passage 13. The tip 22 of the drill 6 and the workpiece 3 can be reached, and the tip 22 and the workpiece 3 can be sufficiently lubricated and cooled. Even if the guide bush 2 and the workpiece 3 are separated from each other, the cutting fluid flows while being entangled and held in the drill groove 20, so that the cutting fluid is a gap between the guide bush 2 and the workpiece 3. , The tip portion 22 of the drill 6 and the workpiece 3 can be easily reached without splashing outward.
Thereby, while being able to lengthen the lifetime of the drill 6, the processing defect of the to-be-processed object 3 can be reduced.

  In the cutting apparatus according to the first embodiment, the supply path 15 is inclined (inclination angle α) with respect to the insertion path 13 and is also inclined in a substantially tangential direction of the inner peripheral surface 13a of the insertion path 13. As shown in FIG. 4, the inclination (inclination angle α) with respect to the insertion path 13 is formed in the same manner as in the first embodiment, and is inserted from the inlet 16. The inner circumferential surface 13a of the passage 13 may be formed from the inflow port 16 toward the center of the insertion passage 13 without providing an inclination in the substantially tangential direction (inclination angle γ).

Next, a cutting apparatus according to a second embodiment of the present invention will be described with reference to FIG.
In the cutting apparatus according to the second embodiment, one end of the introduction pipe 25 is inserted into the supply path 15 of the guide bush 2, and the guide bush 2 and the introduction pipe 25 are integrally configured. . Since other configurations are the same as those of the cutting apparatus according to the first embodiment, description thereof is omitted here.
Then, when the introduction pipe 25 is connected to the introduction pipe 7 connected to the cutting fluid supply device via the connecting portion 26 and the cutting liquid is pumped, the cutting liquid passes through the introduction pipe 7 and the introduction pipe 25 and is supplied to the supply path. 15 flows into the insertion passage 13.
Furthermore, since the flow of the cutting fluid in the insertion passage 13 of the cutting apparatus according to the second embodiment is the same as that of the first embodiment, description thereof is omitted here.

  As described above, according to the cutting apparatus according to the second embodiment, the introduction pipe 7 connected to the cutting fluid supply apparatus has the connection portion 26 connected to the introduction pipe 25 extending from the supply path 15. In order to maintain the state where the nozzle portion 7a of the introduction pipe 7 is always inserted into the supply path 15 as in the first embodiment shown in FIG. There is no need to hold the portion 7a, which is useful.

Next, a cutting apparatus according to a third embodiment of the present invention will be described with reference to FIG.
In the description of the cutting apparatus according to the third embodiment, only differences from the cutting apparatuses according to the first and second embodiments will be described.
In the cutting apparatus according to the third embodiment, the bush plate 1 is provided with a communication passage 27 that communicates with the supply passage 15 of the guide bush 2, and the inlet 16 of the supply passage 15 of the guide bush 2 is connected to the large diameter portion. Ten outer peripheral surfaces 23 are provided.
The communication passage 27 of the bush plate 1 is formed in a substantially L-shaped cross section, and the inlet 28 is provided on the outer surface 29 that is substantially flush with the outer surface 19 of the guide bush 2. 31 is provided to coincide with the inlet 16 of the supply path 15 of the guide bush 2.
Furthermore, the inclination angle of the supply passage 15 with respect to the insertion passage 13 is not the same as the inclination angle α of the supply passage 15 according to the first and second embodiments, but is set to approach the inclination angle α. .

Next, the flow of the cutting fluid in the cutting apparatus according to the third embodiment of the present invention will be described.
First, the nozzle portion 7 a at the tip of the introduction pipe 7 is inserted into the inlet 28 of the communication passage 27 provided in the bush plate 1, and the drill 6 is rotated to drill a hole in the workpiece 3, and at the same time, the cutting fluid is It is pumped from the introduction pipe 7 into the communication passage 27 of the bush plate 1.
Then, the cutting fluid passes through the communication path 27 and the supply path 15 of the guide bush 2 and is injected into the insertion path 13 from the outlet 18 of the supply path 15. Then, the cutting fluid reaches the tip 22 of the drill 6 and the workpiece 3 while being entangled with the outer peripheral surface of the drill 6, and each is lubricated and cooled.

  As described above, according to the cutting apparatus according to the third embodiment, the inlet 16 of the supply passage 15 of the guide bush 2 is located on the outer surface of the guide bush 2 due to problems such as the placement of the introduction pipe 7. It is effective when it cannot be formed into 19.

In the embodiment of the present invention, the form in which the cutting tool is configured by the drill 6 has been described.
Further, in the embodiment of the present invention, the supply path 15 provided in the guide bush 2 is constituted by a single one, but although not shown, the basic supply path 15 is branched from the inflow port 16 and the basic supply path 15 is provided. A plurality of branch supply paths having different inclination angles may be formed.

FIG. 1 is a diagram showing a cutting apparatus according to a first embodiment of the present invention. FIG. 2 shows a guide bush, wherein (a) is a side view and (b) is a cross-sectional view. FIG. 3 is a perspective view of the guide bush. FIG. 4 is a side view showing another form of the supply path provided in the guide bush. FIG. 5 is a diagram showing a cutting apparatus according to the second embodiment of the present invention. FIG. 6 is a diagram showing a cutting apparatus according to the third embodiment of the present invention. FIG. 7 is a diagram illustrating a conventional cutting fluid supply method.

Explanation of symbols

2 Guide bush, 3 Workpiece, 4 Rotating spindle, 6 Drill (cutting tool), 13 Insertion passage, 13a Inner peripheral surface, 15 Supply passage, 16 Inlet, 20 Drill groove, 21 Axis center,

Claims (3)

A cutting apparatus having a guide bush for positioning a cutting tool held on a rotating spindle with respect to a workpiece,
A cutting apparatus characterized in that an insertion path for the cutting tool and a supply path for supplying cutting fluid into the insertion path are provided in the guide bush. The said cutting tool is a drill, Comprising: The inclination angle with respect to the said insertion path of the said supply path, and the inclination angle of the axial center of the said drill and a drill groove | channel are substantially the same. Cutting equipment. The supply path is formed to be inclined from the inflow port in a substantially tangential direction of an inner peripheral surface formed in a substantially circular shape of the insertion passage and in a rotation direction of the drill. The cutting apparatus according to claim 2.

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