KR20230035858A - Machining tool combined with drill and endmill - Google Patents

Abstract

The present invention relates to a machining tool combined with a drill and an endmill, which forms a flow path for spraying cooling fluid inside the tool and supplies strong alkaline water with pH 9 to 13 containing a large amount of fine bubbles to a processing area through the tip of the tool, thereby improving processing efficiency by improving cooling performance and significantly improving chip discharge performance. The machining tool combined with a drill and an endmill according to the present invention comprises: a shank which is detachably coupled to a jig of a drilling device and rotates; a tool head which is formed on the front end of the shank to extend forward, has a peripheral blade formed on the outer peripheral surface of the tip and a plurality of bottom blades formed radially at the bottom of the tip, and has a spiral chip discharge groove formed on the outer peripheral surface to discharge chips; a step portion formed on the surface of the pair of facing bottom blades among the plurality of bottom blades and not in contact with a workpiece when the workpiece is processed; a coolant flow path which is formed to extend axially from the rear end of the shank to the inside of the shank and the inside of the tool head, guides strong alkaline water of pH 9 to 13 supplied from an external cooling fluid supply device to the tip of the tool head, and has the tip formed to communicate with the outside through the step portion, so that the strong alkaline water is sprayed to the outside; and a bubble generating member installed inside a coolant flow path to generate fine bubbles in the strong alkaline water supplied from the cooling fluid supply device.

Description

Drill and end mill combined tool {MACHINING TOOL COMBINED WITH DRILL AND ENDMILL}

The present invention relates to a composite tool for groove or side cutting, and more particularly, allows drilling and end milling to be performed at once without the need for prior drilling when machining a workpiece, and to reduce heat generated during the machining process. It relates to a composite tool in which a cooling water passage is formed inside the tool in order to cool and discharge chips smoothly, and strong alkaline water can be sprayed through the cooling water passage through the front end.

In general, a drill is mounted on a drilling device and used as a cutting tool for forming a hole having a constant diameter in an object to be processed.

An endmill is one of the cutting tools used to trim a narrow plane or dig a groove because it has cutting edges on the outer circumferential surface and the end face.

In order to form a wide elliptical groove, after forming a groove using a drill, an end mill is inserted into the groove and transferred laterally to form a wide elliptical groove or side processing of the groove is performed.

In this way, work productivity is lowered because an elliptical hole must be processed using two tools, a drill and an end mill, sequentially.

In addition, when machining is performed using an end mill, chips are continuously generated and clogged in the groove between the bottom blades of the end mill, resulting in chipping or breakage of the bottom blade, and a phenomenon in which processing cannot be performed efficiently. there is.

To this end, efforts have been made to improve the chip evacuation performance by appropriately modifying the shape of the bottom blade or the chip evacuation groove of the end mill, but there is a limit to improving the chip evacuation performance only by changing the shape of the bottom blade or the chip evacuation groove.

In addition, in the process of end milling, heat is generated by friction with the workpiece. Due to the frictional heat generated at this time, thermal deformation occurs in the end mill before the high-strength workpiece is drilled, and the red blade for drilling is quickly cut. It becomes dull, eventually becoming unusable or significantly reducing its lifespan.

In order to solve this problem, conventionally, cutting oil is supplied through a bellows-shaped hose to the contact point between the end mill and the workpiece during end mill operation to suppress heat and at the same time to shake off chips generated during the machining process.

However, cooling using cutting oil has a problem of low cooling effect, causing problems of environmental pollution, cumbersome use, and complicated structure for supplying cutting oil.

Republic of Korea Patent Publication No. 10-2010-0113833 Republic of Korea Utility Model Publication No. 20-1998-011996

The present invention is to solve the above problems, and an object of the present invention is to perform groove processing and groove side processing with one tool, and to form a flow path for cooling fluid injection inside the tool through the tip of the tool. By supplying strong alkaline water of pH 9 to 13 to the processing part, cooling performance is improved and at the same time chip evacuation performance is greatly improved to provide a drill and end mill complex tool that can improve machining efficiency.

Another object of the present invention is to provide a composite tool capable of further improving cooling and chip discharge performance by strong alkaline water by generating a large amount of fine bubbles in the process of supplying strong alkaline water through a flow path inside the composite tool.

A drill and end mill composite tool according to the present invention for achieving the above object includes a shank that is detachably coupled to a jig of a drilling device and rotates; It is formed to extend forward at the front end of the shank, an outer blade is formed on the outer circumferential surface of the front end, a plurality of bottom blades are radially formed on the bottom of the front end, and a chip discharge groove for discharging chips is formed in a spiral shape on the outer circumferential surface tool head; A stepped portion formed on the surface of a pair of facing bottom blades among the plurality of bottom blades and not contacting the workpiece during processing of the workpiece; It is formed to extend in the axial direction from the rear end of the shank to the inside of the shank and the inside of the tool head, and guides the strong alkaline water of pH 9 to 13 supplied from an external cooling fluid supply device to the front end of the tool head, and the front end is the step A cooling water flow path formed to communicate with the outside through a part and spraying strong alkaline water to the outside; and a bubble generating member installed inside the cooling water passage to generate fine bubbles in the strong alkaline water supplied from the cooling fluid supply device.

The cooling water passage is concave in the axial direction at the center of the rear end of the shank and extends in the axial direction from the front end of the inlet port to the front end of the tool head, and an inlet port connected to an external cooling fluid supply device. A middle flow passage portion having a smaller inner diameter than the inlet port portion, a rear end portion communicating with a front end portion of the middle flow passage portion, and a spray hole having a front end portion communicating with the outside through the stepped portion, the bubble generating member inside the inlet port portion can be installed.

The bubble generating member includes a bar-shaped hub shaft extending axially from the center of the inlet port portion, and a plurality of bubble generating pins extending radially from the outer surface of the hub shaft to generate bubbles by colliding with strong alkaline water. In addition, the bubble generating member is made of an elastic material so that the bubble generating pin can be elastically adhered to the inner surface of the inlet port and rotated together with the shank.

A cooling fluid supply passage for supplying strong alkaline water to the cooling water passage is formed inside the jig of the drilling device to which the shank is coupled, and an auxiliary bubble generating member in the form of a mesh net for generating bubbles in the strong alkaline water is formed in the cooling fluid supply passage can be installed

A drill and end mill composite tool according to another aspect of the present invention includes a shank that is detachably coupled to a jig of a drilling device and rotates; It is formed to extend forward at the front end of the shank, an outer blade is formed on the outer circumferential surface of the front end, a plurality of bottom blades are radially formed on the bottom of the front end, and a chip discharge groove for discharging chips is formed in a spiral shape on the outer circumferential surface tool head; a stepped portion formed on a surface of a pair of facing bottom blades among the plurality of bottom blades and not contacting the workpiece during processing of the workpiece; An inlet port portion concavely formed in the axial direction at the center of the rear end of the shank and connected to an external cooling fluid supply device, and extending axially from the front end of the inlet port portion to the front end of the tool head and extending from the inlet port portion pH 9 to 13 supplied from an external cooling fluid supply device, including an intermediate flow passage having a small inner diameter, a spray hole in which the rear end communicates with the front end of the intermediate passage and the front end communicates with the outside through the stepped portion. A cooling water passage for guiding strong alkaline water to the tip of the tool head and spraying it through the stepped portion; And, a bubble generating member installed inside the inlet port of the cooling water flow path, made of an elastic material and elastically adhered to the inner surface of the inlet port to generate fine bubbles in the strong alkaline water while rotating together with the shank, The bubble generating member includes a bar-shaped hub shaft extending in the axial direction from the center of the inlet port unit, a plurality of bubble generating pins formed to extend radially on the outer surface of the hub shaft and generating bubbles by colliding with strong alkaline water, and , It may include a support part formed in a circular ring shape at the front end of the hub shaft and closely adhered to the inside of the inlet port part.

According to the present invention, when processing a workpiece, strong alkaline water of pH 9 to 13 is sprayed as a cooling fluid through the front end of the tool head to cool, lubricate, and discharge chips, so peripheral machinery or machine parts in the process of processing a workpiece. corrosion can be prevented, and better cooling and lubricating effects can be obtained than conventional cutting oil by vaporization of strong alkaline water.

In particular, a bubble generating member for generating fine bubbles in strong alkaline water is installed inside the composite tool, so that fine bubbles can be created and sprayed inside the composite tool, so cooling and lubrication by strong alkaline water and chip discharge performance can be further improved. there will be

1 is a front view of a composite tool according to an embodiment of the present invention.
2 is a view of a cutting edge portion viewed from the front end of a composite tool according to an embodiment of the present invention.
2 is a view showing a front end of a composite tool according to an embodiment of the present invention.
4 is a view showing an embodiment of a bubble generating member constituting a composite tool according to the present invention.
5 is a front view of a composite tool according to another embodiment of the present invention.
6 is an enlarged view of part A of FIG. 5 .

The embodiments described in this specification and the configurations shown in the drawings are only one preferred example of the disclosed invention, and there may be various modifications that can replace the embodiments and drawings in this specification at the time of filing of the present application.

Hereinafter, with reference to the accompanying drawings, a drill and end mill composite tool will be described in detail according to the following embodiments. Like symbols in the drawings indicate like components.

1 to 4, the composite tool according to an embodiment of the present invention includes a shank 20 that is detachably coupled to a jig 50 of a drilling device (not shown) and rotates, and the shank A tool head 10 formed to extend forward from the front end of the 20 to cut the workpiece, and a cooling water passage formed to penetrate the shank 20 and the tool head 10 in the axial direction to spray strong alkaline water (30).

The shank 20 is mounted on a jig 50 of a known drilling device (not shown), and rotates together as the jig of the drilling device receives power transmitted from a motor and rotates at high speed. The shank 20 may have a cylindrical shape, but is not limited thereto, and may have various shapes that can be easily and firmly coupled to the jig 50 of the drilling device (not shown).

As shown in FIG. 1, the tool head 10 is formed to extend forward at the front end of the shank 20, the outer peripheral edge 12 is formed in a spiral shape on the outer circumference, and a plurality of bottom blades 11 are formed on the bottom of the front end. It is formed radially. In addition, on the outer circumferential surface of the tool head 10, a chip discharge groove 13 for discharging chips is formed in a spiral shape.

The bottom blade 11 of the tool head 10 can be implemented in various forms such as 4 blades, 6 blades, and 8 blades. do.

The bottom blade 11 is composed of two pairs of bottom blades 11 having symmetrical shapes with respect to the front end center C of the tool head 10.

Here, the pair of bottom blades 11 include a pair of drill blade portions 11a for drilling and a first inclined surface 11b extending from the drill blade portion 11a and having an inclination.

And the other pair of bottom blades 11 extend from the inner blade portion 11c and the inner blade portion 11c and have an inclined second inclined surface 11d and the inner blade portion 11c and the outer side of the second inclined surface 11d. It includes a stepped portion (11e) formed on.

Gashes 11f are formed in four directions around the center C of the front end of the tool head 10 .

The stepped portion 11e does not come into contact with the workpiece, and during drilling, the inner blade portion 11c holds the center and performs center processing, and a pair of cutting edges 11a process the outside of the center, resulting in stable high-speed drilling. possible.

That is, if the stepped portion 11e is not formed, chips are formed to a large extent in the portion cut from the outside of the cutting edge 11a, and the discharge allowance width for chips generated in the portion cut from the inside of the cutting edge 11a is lost. clogging may occur, making drilling difficult.

However, in the composite tool according to a preferred embodiment of the present invention, the stepped portion 11e does not come into contact with the workpiece during drilling due to the stepped portion 11e, so the chips generated from the cutting portion inside the cutting edge 11a are smoothly discharged. This enables stable high-speed drilling.

And after the high-speed drilling operation is performed in this way, the end mill operation is possible through the outer circumferential blade 12 while feeding in four directions of the composite tool.

Therefore, the composite tool according to a preferred embodiment of the present invention can perform drilling and end milling operations with one tool.

Through this, when working with a drill tool and an end mill tool, respectively, there is an effect of further improving work productivity by reducing work time by half or less.

In addition, the composite tool of the present invention sprays strong alkaline water with a pH of 9 to 13 containing a large amount of fine bubbles through the front end of the tool head 10 during the processing of the workpiece, so that the chips generated during the processing are smoothly discharged. At the same time, it is configured to have a function that can quickly cool the frictional heat.

To this end, strong alkaline water of pH 9 to 13 supplied from an external cooling fluid supply device to the inside of the shank 20 and the inside of the tool head 10 from the rear end of the shank 20 is guided to the front end of the tool head 10 A cooling water passage 30 is formed to extend in the axial direction. The outlet of the cooling water passage 30 is formed in the stepped portion 11e of the bottom blade 11 formed at the front end of the tool head 10, and cools by discharging strong alkaline water without interfering with cutting by the bottom blade 11. and improve chip evacuation performance.

In this embodiment, the cooling water passage 30 is concave in the axial direction at the center of the rear end of the shank 20 and connected to an external cooling fluid supply device (not shown), the inlet port portion 31, the inlet port An intermediate flow path portion 32 extending in the axial direction from the front end of the portion 31 to the front end of the tool head 10 and having a smaller inner diameter than the inlet port portion 31, and the rear end of the middle flow path portion 32 It communicates with the front end of the front end and includes a spray hole 33 communicating with the outside through the stepped portion 11e of the tool head 10.

The inlet port part 31 is in communication with the cooling fluid supply passage 51 of the cooling fluid supply device (not shown) formed through the inside of the jig 50 of the drilling device (not shown), so that the cooling fluid is supplied during processing of the workpiece. is supplied with The cooling fluid supply passage 51 of the jig 50 is configured to be relatively rotatable by a bearing 52 .

The middle passage part 32 has a smaller inner diameter than the inlet port part 31 and acts to accelerate the strong alkaline water introduced into the inlet port part 31 .

The jetting hole 33 is formed at the front end of the middle passage 32 and sprays the strong alkaline water supplied through the inlet port 31 and the middle passage 32 to the outside of the tool head 10 to the bottom edge of the front end. (11) and the outer circumferential blade 12 on the outer circumferential surface to cool the heat generated in the process of processing the workpiece, and to further facilitate chip discharge. Here, it is preferable that the injection port 33 be inclined at a predetermined angle in the lateral direction from the stepped portion 11e of the bottom blade 11 in order to smoothly discharge the strong alkaline water and prevent the strength of the bottom blades 13 and 14 from deteriorating. .

On the other hand, the composite tool of the present invention uses strong alkaline water with a pH of 9 to 13 instead of known cutting oil or general water as a cooling fluid for cooling, lubricating, and chip evacuation. Corrosion of parts can be prevented, and a cooling effect superior to that of cutting oil can be obtained by vaporization of strong alkaline water. As strong alkaline water, although pH 9-13 can be used, it is more preferable to use strong alkaline water of pH 12-13.

Strong alkaline water with a pH of 9 to 13 has excellent interfacial permeability, exfoliation and decomposition ability, and emulsification/separation ability, so it has excellent cooling and lubrication performance. In addition, if strong alkaline water is left in the air, it naturally approaches pH 7.0 and loses alkalinity, so environmental pollution can be prevented.

On the other hand, when the strong alkaline water is supplied through the front end of the tool head 10 to cool the frictional heat generated in the machining process, if fine bubbles are contained in the strong alkaline water, the cooling performance can be further improved by faster evaporation. . Accordingly, a bubble generating member 40 for generating fine bubbles in the strong alkaline water supplied from the cooling fluid supply device is installed inside the cooling water passage 30 .

Referring to FIGS. 1 and 4, in this embodiment, the bubble generating member 40 is installed inside the inlet port 31 of the cooling water flow path 30, and ensures a smooth flow of strong alkaline water while generating a large amount of fine bubbles. It consists of a structure that can be created. The bubble generating member 40 for this purpose is a bar-shaped hub shaft 41 extending in the axial direction at the center of the inlet port 31 and radially extending on the outer surface of the hub shaft 41, so that strong alkali It includes a plurality of bubble generating pins 42 that collide with water to generate bubbles.

The bubble generating pins 42 of the bubble generating member 40 are irregularly arranged along the axial direction of the hub shaft 41 and collide with strong alkaline water flowing into the inlet port 31 to generate fine bubbles. The bubble generating pins 42 may be arranged irregularly on the hub shaft 41, but may be spirally arranged on the outer surface of the hub shaft 41 along the axial direction.

In addition, the bubble generating member 40 may be made of a metal material, but it is made of an elastic material such as rubber or silicone, so that the bubble generating pin 42 is elastically adhered to the inner surface of the inlet port portion 31 so that the shank 20 ) may generate fine bubbles while rotating together with the shank 20 when it rotates. In this way, in the bubble generating member 40, a plurality of bubble generating pins 42 collide with strong alkaline water to generate fine bubbles, and at the same time, vibration generated in the composite tool when the composite tool rotates at high speed ), and the bubble generating pin 42 of the bubble generating member 40 generates fine bubbles in the strong alkaline water.

A support part 43 in the form of a circular ring may be formed at the front end of the hub shaft 41 of the bubble generating member 40 to support the bubble generating member 40 in close contact with the inside of the inlet port 31. .

As described above, in the composite tool of the present invention, a cooling water passage 30 capable of supplying strong alkaline water is formed inside the shank 20 and the tool head 10, and a large amount of fine bubbles can be generated inside the cooling water passage 30. Since the bubble generating member 40 is installed, cooling and lubrication by strong alkaline water and chip discharge performance can be further improved.

In addition, as described above, the bubble generating member 40 having a structure in which the hub shaft 41 and the plurality of bubble generating pins 42 are arranged can generate a large amount of fine bubbles in strong alkaline water, and is a cooling water flow path of a complex tool ( 30), it is very easy to install and separate, so installation and maintenance are also very easy.

As described above, in order to increase the amount of fine bubbles generated when supplying strong alkaline water during processing of a workpiece by a complex tool, as shown in FIGS. 5 and 6, a jig 50 of a drilling device (not shown) An auxiliary bubble generating member 60 in the form of a mesh net for generating bubbles in strong alkaline water may be additionally installed in the cooling fluid supply passage 51 formed therein.

The auxiliary bubble generating member 60 may be detachably installed at the outlet of the cooling fluid supply passage 51 of the jig 50 . When the auxiliary bubble generating member 60 is detachably installed at the outlet of the cooling fluid supply passage 51 of the jig 50, when foreign substances accumulate on the auxiliary bubble generating member 60, the auxiliary bubble generating member 60 is removed from the jig 50. It can be separated from (50), washed, and then used again by attaching to the jig (50) or replaced with a new one.

In addition, a ball-shaped bubble-generating particle 61 may be provided inside the auxiliary bubble-generating member 60 to generate bubbles by vibration.

In the above, the technical idea of the present invention has been described with the accompanying drawings, but this is an illustrative example of a preferred embodiment of the present invention, but does not limit the present invention. In addition, it is obvious that various modifications and imitations can be made by anyone having ordinary knowledge in the technical field to which the present invention belongs without departing from the scope of the technical idea of the present invention.

10: tool head 11: bottom blade
11a: drill blade part 11b: first inclined surface
11c: inner blade 11d: second inclined surface
11e: stepped part 11f: Gash
12: outer edge 13: chip discharge groove
20: shank 30: cooling water passage
31: inlet port part 32: middle passage part
33: nozzle 40: bubble generating member
41: hub shaft 42: bubble generating pin
43: support part 50: jig
51: cooling fluid supply passage 60: auxiliary bubble generating member
61: bubble generating particles

Claims (5)

A shank that is detachably coupled to the jig of the drilling device and rotates;
It is formed to extend forward at the front end of the shank, an outer blade is formed on the outer circumferential surface of the front end, a plurality of bottom blades are radially formed on the bottom of the front end, and a chip discharge groove for discharging chips is formed in a spiral shape on the outer circumferential surface tool head;
A stepped portion formed on the surface of a pair of facing bottom blades among the plurality of bottom blades and not contacting the workpiece during processing of the workpiece;
It is formed to extend in the axial direction from the rear end of the shank to the inside of the shank and the inside of the tool head, and guides the strong alkaline water of pH 9 to 13 supplied from an external cooling fluid supply device to the front end of the tool head, and the front end is the step A cooling water flow path formed to communicate with the outside through a part and spraying strong alkaline water to the outside; and,
a bubble generating member installed inside the cooling water passage to generate fine bubbles in the strong alkaline water supplied from the cooling fluid supply device;
A drill and end mill composite tool comprising a. The cooling water passage according to claim 1, wherein the cooling water passage is formed concavely in the axial direction at the center of the rear end of the shank and connected to an external cooling fluid supply device, and an inlet port portion connected to an external cooling fluid supply device, and an inlet port portion extending from the front end of the tool head to the front end of the tool head. An intermediate flow path portion extending in the axial direction to and having a smaller inner diameter than the inlet port portion, and a jetting opening whose rear end communicates with the front end of the intermediate flow path and whose front end communicates to the outside through the stepped portion,
A drill and end mill composite tool in which the bubble generating member is installed inside the inlet port. The method of claim 2, wherein the bubble generating member is a bar-shaped hub shaft extending axially from the center of the inlet port unit, and a plurality of bubbles formed extending radially from the outer surface of the hub shaft to collide with strong alkaline water to generate bubbles. Including a bubble generating pin of,
The bubble generating member is made of an elastic material and the bubble generating pin is elastically adhered to the inner surface of the inlet port portion to rotate together with the shank drill and end mill composite tool. The method of claim 1, wherein a cooling fluid supply passage for supplying strong alkaline water to the cooling water passage is formed inside the jig of the drilling device to which the shank is coupled, and a mesh network form generating bubbles in the strong alkaline water in the cooling fluid supply passage A drill and end mill composite tool in which an auxiliary bubble generating member is installed. A shank that is detachably coupled to the jig of the drilling device and rotates;
It is formed to extend forward at the front end of the shank, an outer blade is formed on the outer circumferential surface of the front end, a plurality of bottom blades are radially formed on the bottom of the front end, and a chip discharge groove for discharging chips is formed in a spiral shape on the outer circumferential surface tool head;
A stepped portion formed on the surface of a pair of facing bottom blades among the plurality of bottom blades and not contacting the workpiece during processing of the workpiece;
An inlet port portion concavely formed in the axial direction at the center of the rear end of the shank and connected to an external cooling fluid supply device, and extending axially from the front end of the inlet port portion to the front end of the tool head and extending from the inlet port portion pH 9 to 13 supplied from an external cooling fluid supply device, including an intermediate flow passage having a small inner diameter, a spray hole in which the rear end communicates with the front end of the intermediate passage and the front end communicates with the outside through the stepped portion. A cooling water passage for guiding strong alkaline water to the tip of the tool head and spraying it through the stepped portion; and,
a bubble generating member installed inside the inlet port of the cooling water flow path, made of an elastic material, and elastically adhered to the inner surface of the inlet port to generate fine bubbles in the strong alkaline water while rotating together with the shank;
including,
The bubble generating member includes a bar-shaped hub shaft extending axially from the center of the inlet port portion, a plurality of bubble-forming pins formed to extend radially on the outer surface of the hub shaft and generating bubbles by colliding with strong alkaline water, and , Drill and end mill complex tool including a support part formed in a circular ring shape at the front end of the hub shaft and closely adhered to the inside of the inlet port part.

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