KR102425210B1 - Method for manufacturing taper drill reamer and taper drill reamer manufactured thereby - Google Patents

Abstract

The present invention provides a method for manufacturing a taper drill reamer, which can machine a smooth hole with tapered surfaces and accurate dimensions while effectively discharging cut chips, generated during machining, after finely cutting the cut chips, and a taper drill reamer manufactured thereby. The method comprises: a centering machining step (S10) of performing centering machining on both ends of a cemented carbide material; a taper machining step (S20) of forming a tapered portion (T) on one side of the material that has passed through the centering machining step (S10); a drill portion machining step (S30) of forming a drill portion (D) on one side of the tapered portion (T); a flute machining step (S40) of forming a plurality of flutes (10) in a spiral shape along the outer circumferential surfaces of the tapered portion (T) and the drill portion (D); a tip machining step (S50) of forming a first clearance surface (A1), a second clearance surface (A2), and a flute surface (A3) while forming a tip angle (E); a side edge machining step (S60) of machining side edges (20) on the outer circumferential surfaces thereof between the flutes (10); and a side edge surface machining step (S70) of forming a third clearance surface (S1) and a fourth clearance surface (S2) on each of side edge surfaces (S).

Description

Method for manufacturing a taper drill reamer and a taper drill reamer manufactured thereby

The present invention relates to a method for manufacturing a taper drill reamer and a taper drill reamer manufactured thereby, and more particularly, to taper the inner peripheral surface of the hole while making a hole in the workpiece, or taper the inner peripheral surface of the drilled hole. It relates to a taper drill reamer used when and a manufacturing method thereof.

Hole processing in the metalworking industry is the most basic and difficult task.

In such hole processing, it is required that the cutting chips are smoothly discharged to form an accurate dimension and a smooth processing surface. In particular, when processing a hole having a tapered surface (tapered surface), this is more urgently required.

On the other hand, the drill reamer is a tool in which the tip part is formed with a drill and the thick diameter part is in the form of a reamer, and it enables hole (hole) processing and finishing processing at the same time, thereby shortening the processing time.

In addition, the taper drill reamer is a tool used when machining a hole having a tapered surface, and enables tapered hole machining and finishing machining at once.

When manufacturing such a taper drill reamer, it includes precise processes such as a tapered part forming process, a flute forming process, and a side blade forming process, and thus, efficient and precise taper drill reamer manufacturing technology is required.

Japanese Patent Laid-Open No. 2019-202402

The present invention has been devised to solve the above problems, and an object of the present invention is to produce a tapered drill reamer capable of processing a hole having a tapered surface to a smooth and accurate dimension by effectively discharging the chips generated during processing. to provide a way

In addition, an object of the present invention is to provide a tapered drill reamer that can be expected to have a long life by applying a cemented carbide excellent in welding resistance, abrasion resistance, and fracture resistance to a manufacturing method.

Another object of the present invention is to provide a taper drill reamer to which cutting oil can be smoothly and efficiently supplied.

In order to achieve the above object, the method of manufacturing a taper drill reamer according to the present invention includes a centering processing step of cutting a round bar of cemented carbide material to a predetermined length, grinding the outer peripheral surface, and centering the both ends of the material; a taper processing step of forming a tapered part on one side of the material that has undergone the centering processing step after the centering processing step; a drill part processing step of forming a drill part on one side of the tapered part after the taper processing step; a flute processing step of forming a plurality of flutes spirally along the outer circumferential surface of the tapered portion and the drill portion in the material that has undergone the drilling portion processing step after the drilling portion processing step; After the flute processing step, a first free surface is formed while a tip angle of 120 to 140° is formed at the tip of the material that has undergone the flute processing step, and then a second free surface in contact with the first free surface is formed, a tip processing step of forming a flute surface in contact with the second free surface on one side of the flute; a side blade processing step of machining a plurality of side blades at regular intervals along the longitudinal direction of the material on the outer peripheral surface between the flute and the flutes in the material that has undergone the tip processing step after the tip processing step; and a side blade surface processing step of forming a third clearance surface on the side blade surface formed between the side blade and the side blade after the side blade processing step, and then forming a fourth clearance surface in contact with the third clearance surface.

As a preferred embodiment of the present invention, the first clearance angle, which is an acute angle formed when the first clearance surface and the second clearance surface are in contact, is 5° to 10°, and the acute angle formed when the second clearance surface and the flute surface are in contact. The second clearance angle is 23° to 27°, and the third clearance angle, which is an acute angle formed when the third clearance surface and the fourth clearance surface are in contact, may be 5° to 12°.

In addition, as an embodiment of the present invention, the cemented carbide alloy has an average particle diameter of 0.1 to 2㎛ cobalt (Co) 1 to 5% by mass, and nickel (Ni) having an average particle diameter of 0.1 to 3㎛ 1 to 5% by mass with 0.1 to 3 mass% of TaNbC particles having an average particle diameter of 0.1 to 5 μm, 0.01 to 2 mass% of vanadium having an average particle diameter of 0.1 to 3 μm, and 0.1 to 3 μm of zirconium carbide (ZrC) with an average particle diameter of 0.1 to It contains 3% by mass, and the rest is made of tungsten carbide (tungsten carbide, WC) having an average particle diameter of 0.1 to 1 μm, a coating layer is formed on the surface of the cemented carbide, and the coating layer is a TiAlCN layer (layer A) and AlCrCN layers (layer B) are sequentially laminated to a thickness of 0.1 to 0.3 μm, respectively, but the thickness ratio of layer B/layer A may be 0.5 to 1.5.

In addition, the tapered drill reamer according to the present invention is manufactured by the above manufacturing methods and has a coolant groove, and the coolant groove is formed spirally along the outer circumferential surface of the shank while being split into a plurality at the end of the shank, each extending to the flute. formed to be

The taper drill reamer manufactured by the manufacturing method according to the present invention has a number of side blades formed in the longitudinal direction, so that chips generated during cutting are cut into small pieces by the side blades and can be smoothly discharged without interfering with the processing surface. and smooth, tapered holes can be machined.

The taper drill reamer manufactured by the manufacturing method according to the present invention has excellent wear resistance, and thus a long lifespan can be expected.

1 is a block diagram schematically illustrating a method of manufacturing a taper drill reamer according to the present invention;
2 and 3 are views showing a taper drill reamer manufactured by a manufacturing method according to an embodiment of the present invention,
4 is a view for explaining the tip angle of the tip of the tapered drill reamer manufactured by the manufacturing method according to the present invention, [more specifically, (a) is an expression of the tip angle in the three-dimensional form of the taper drill reamer, ( b) is a sectional representation of a part of (a)]
5 is a view showing the first clearance surface, the second clearance surface, and the first clearance angle of the taper drill reamer manufactured by the manufacturing method according to the present invention, [more specifically, (a) is the taper drill reamer The first relief angle is expressed in a three-dimensional form, and (b) is a sectional view of a part of (a)]
6 is a view showing a second clearance surface, a flute surface, and a second clearance angle of the taper drill reamer manufactured by the manufacturing method according to the present invention, [more specifically, (a) is a three-dimensional shape of the tapered drill reamer The second relief angle is expressed in Fig. (b), a part of (a) is expressed as a cross-sectional view]
7 is a view showing a side edge, a side edge surface, and a third clearance angle of the taper drill reamer manufactured by the manufacturing method according to the present invention, [more specifically, (a) is a third in the three-dimensional form of the tapered drill reamer The relief angle is expressed, and (b) is a sectional view of a part of (a)]
8 is a view for explaining a taper drill reamer in which a coolant groove is formed in the shank as another embodiment of the present invention. [Symbol P shows the bottom view of the taper drill reamer showing the end of the shank]

The taper drill reamer made of cemented carbide material manufactured in the manufacturing method according to the present invention has a number of side blades formed in the longitudinal direction so that chips generated during cutting are cut into small pieces by the side blades and smoothly through the flute without interfering with the processing surface As it can be ejected, it is possible to process holes with a tapered surface precisely and smoothly.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1, the manufacturing method according to the present invention is a centering processing step (S10), a taper processing step (S20), a drill part processing step (S30), a flute processing step (S40), a tip processing step (S50) , a side blade processing step (S60), and a side blade surface processing step (S70).

The centering processing step (S10) of the present invention is a step of cutting the round bar of the cemented carbide material to a predetermined length, then grinding the outer peripheral surface and centering the both ends of the material.

Referring to the drawing shown next to the block diagram in FIG. 1, after cutting a round bar made of cemented carbide material to a desired predetermined length, the outer circumferential surface is smoothly polished through a known cylindrical grinding machine. The length and thickness of the material is determined by the specifications of the taper drill reamer.

Then, by forming fine holes (or grooves) at both ends of the material using a known electric discharge machine (in FIG. 1, denoted as C), a centering operation is performed to rotate the longitudinal direction of the material as an axis.

As a preferred embodiment of the present invention, the cemented carbide alloy applied to the manufacture of the tapered drill reamer of the present invention is 1 to 5 mass% of cobalt (Co) having an average particle diameter of 0.1 to 2 μm, and nickel having an average particle diameter of 0.1 to 3 μm. (Ni) 1 to 5 mass%, 0.1 to 3 mass% of TaNbC particles having an average particle diameter of 0.1 to 5 µm, 0.01 to 2 mass% of vanadium having an average particle diameter of 0.1 to 3 µm, and an average particle diameter of 0.1 to 3 µm Zirconium carbide (ZrC) containing 0.1 to 3 mass%, the rest is made of tungsten carbide (tungsten carbide, WC) having an average particle diameter of 0.1 to 1㎛, a film layer is formed on the surface of the cemented carbide.

In addition, the coating layer is made by sequentially stacking a TiAlCN layer (layer A) and an AlCrCN layer (layer B) to a thickness of 0.1 to 0.3 μm, respectively, and it is preferable that the thickness ratio of the B layer/A layer is 0.5 to 1.5.

Since the cemented carbide material applied to the present invention is made of the above components, the wear resistance and fracture resistance of the tapered drill reamer manufactured by the present invention can be significantly increased.

In addition, plastic deformation on the surface of the cemented carbide is suppressed due to the coating layer, and adhesion resistance is improved on the surface of the cemented carbide, and heat resistance or oxidation resistance can be improved.

The taper processing step (S20) of the present invention is a step of forming a tapered portion (T) on one side of the material after the centering processing step (S10) is finished, and a known processing tool (or processing wheel) while rotating the material ] through The taper dimension can be designed and manufactured in various ways, such as 1/16, 3/8, 1/8, etc. according to the specifications of the taper drill reamer.

The drill part processing step (S30) of the present invention is a step of forming the drill part (D) on one side of the tapered part (T) after the taper processing step (S20). Similarly, while rotating the material, a known processing tool is performed through The drill part (D) may be machined in a cylindrical shape.

The flute processing step (S40) of the present invention is a plurality of spirally along the outer peripheral surface of the tapered portion (T) and the drill portion (D) in the material that has undergone the drill portion processing step (S30) after the drill portion processing step (S30) It is a step to form the flute 10 of.

As a preferred embodiment, the flute 10 as shown in FIG. 2 or FIG. 3 may be formed using a known 5-axis CNC machining machine. The fluter 10 may be designed with two blades, three blades, four blades, etc. according to the specifications of the taper drill reamer, and FIGS. 2 and 3 show the form of two blades.

In the tip processing step (S50) of the present invention, a tip angle (E) of 120 to 140° is formed at the tip (P) of the material that has undergone the flute processing step (S40) after the flute processing step (S40) (Fig. 4) After forming the first clearance surface (A1) and then forming the second clearance surface (A2) in contact with the first clearance surface (A1), the second clearance surface ( This is a step of forming the flute surface A3 in contact with A2).

The tip processing step (S50) may be performed by a known processing method through a known processing tool. On the other hand, the reason for providing the free surface is to smoothly discharge the cutting chips during cutting, to reduce unnecessary friction when in contact with the workpiece, and to suppress the occurrence of burrs.

The side blade processing step (S60) of the present invention is a side blade 20 on the outer peripheral surface between the flute 10 and the flute 10 in the material that has undergone the tip processing step (S50) after the tip processing step (S50) in FIG. 2 3 and the like, it is a step of processing a plurality of materials at regular intervals along the longitudinal direction of the material. The side edge 20 may be processed by known processing tools and processing methods.

As shown in FIGS. 2 and 3, the side blade 20 cuts chips or cutting chips generated when a workpiece (object or material to be processed) is processed by the taper drill reamer according to the present invention. will be.

Therefore, the taper drill reamer manufactured by the manufacturing method of the present invention has a drill part and a taper part integrally, so that hole (hole) processing and taper processing are possible at the same time, and the cutting chips are finely cut through the side blade 20 and flute Through (10), the cutting chips are smoothly discharged, so that the taper surface hole machining can be performed effectively and precisely.

In addition, the present invention forms a third clearance surface (S1) on the side blade surface (S) formed between the side blade 20 and the side blade 20 after the side blade processing step (S60), and then the third clearance surface ( S1) and a side edge surface processing step (S70) to form a fourth clearance surface (S2) in contact.

Similarly, the reason for forming the third clearance surface S1 and the fourth clearance surface S4 is to smoothly discharge the cutting chips during cutting to block the interference of the cutting chips and reduce unnecessary friction when in contact with the workpiece. and to suppress the occurrence of burrs.

In the taper drill reamer of the present invention, a predetermined angle is formed while the relief surfaces A1, A2, S1, and S2 and the flute surface A3 are adjacent to each other and in contact with each other. The acute angle formed when the first clearance surface A1 and the second clearance surface A2 are in contact is the first clearance angle R1, and the acute angle formed when the second clearance surface A2 and the flute surface A3 are in contact is the second In a preferred embodiment of the present invention, when the clearance angle R2 and the acute angle formed by contacting the third clearance surface S1 and the fourth clearance surface S2 are referred to as the third clearance angle R3, as a preferred embodiment of the present invention, the The first clearance angle R1 may be 5° to 10°, the second clearance angle R2 may be 23° to 27°, and the third clearance angle R3 may be 5° to 12°.

Due to the relief angles R1, R2, and R3, unnecessary contact and friction between the taper drill reamer and the workpiece during cutting can be reduced, and the formation of burrs can be suppressed. The angle of the relief angle may be changed according to the purpose or specification of the taper drill reamer.

As another embodiment of the present invention, the taper drill reamer manufactured by the above manufacturing method may have a coolant groove 30 as shown in FIG. 8 .

More specifically, as shown in FIG. 8, the coolant grooves 30 are formed spirally along the outer circumferential surface of the shank X while being split into a plurality at the end of the shank X, each extending to the flute 10. can be formed.

Therefore, since the coolant groove 30 is formed in the taper drill reamer, when the coolant is supplied from the upper side of the taper drill reamer during cutting, the coolant is smoothly supplied to the cutting point through the flute 10 even when the taper drill reamer rotates. Thus, excellent machining quality can be achieved.

Although preferred embodiments of the present invention have been described above, it will be apparent to those of ordinary skill in the art that various modifications are possible within the limits that do not depart from the scope of the present invention. Accordingly, the above contents are not intended to limit the scope of the present invention defined by the following claims.

10: flute, 20: side edge, 30: coolant groove.

Claims (3)

In the manufacturing method of the taper drill reamer,
A centering processing step (S10) of cutting the round bar of cemented carbide material to a predetermined length, grinding the outer circumferential surface, and centering the both ends of the material;
a taper processing step (S20) of forming a tapered portion (T) on one side of the material that has undergone the centering processing step (S10) after the centering processing step (S10);
A drill part processing step (S30) of forming a drill part (D) on one side of the tapered part (T) after the taper processing step (S20);
Flute processing to form a plurality of flutes 10 spirally along the outer peripheral surfaces of the tapered part T and the drill part D in the material that has undergone the drill part processing step (S30) after the drill part processing step (S30) step (S40) and;
After the flute processing step (S40), a first clearance surface (A1) is formed while a tip angle (E) of 120 to 140° is formed at the tip of the material that has undergone the flute processing step (S40), and then the first clearance After forming the second clearance surface A2 in contact with the surface A1, the tip processing step of forming the flute surface A3 in contact with the second clearance surface A2 on one side of the flute 10 (S50) Wow;
In the material that has undergone the tip processing step (S50) after the tip processing step (S50), a plurality of side blades 20 are machined at regular intervals along the length direction of the material on the outer peripheral surface between the flute 10 and the flute 10 a side blade processing step (S60) and;
After the side blade processing step (S60), a third clearance surface (S1) is formed on the side blade surface (S) formed between the side blade 20 and the side blade 20, and then the third clearance surface (S1) is in contact with the third clearance surface (S1). 4 Including a side blade surface processing step (S70) to form a spare surface (S2),
The first clearance angle R1, which is an acute angle formed by contacting the first clearance surface A1 and the second clearance surface A2, is 5° to 10°, and the second clearance surface A2 and the flute surface A3 ), the second clearance angle R2, which is an acute angle, is 23° to 27°, and the third clearance angle R3, which is an acute angle formed when the third clearance surface S1 and the fourth clearance surface S2 are in contact with each other. ) is a method of manufacturing a taper drill reamer, characterized in that 5 ° to 12 °.
◈Claim 2 was abandoned when paying the registration fee.◈ The method of claim 1,
The cemented carbide is
1 to 5 mass% of cobalt (Co) having an average particle diameter of 0.1 to 2 µm, 1 to 5 mass% of nickel (Ni) having an average particle diameter of 0.1 to 3 µm, 0.1 to 0.1 to TaNbC particles having an average particle diameter of 0.1 to 5 µm 3% by mass, 0.01 to 2% by mass of vanadium having an average particle diameter of 0.1 to 3㎛, and 0.1 to 3% by mass of zirconium carbide (ZrC) having an average particle diameter of 0.1 to 3㎛, the remainder having an average particle diameter of 0.1 to 1㎛ made of tungsten carbide (tungsten carbide, WC), a film layer is formed on the surface of the cemented carbide,
The film layer is made by sequentially stacking a TiAlCN layer (A layer) and an AlCrCN layer (B layer) to a thickness of 0.1 to 0.3 μm, respectively, and the thickness ratio of the B layer/A layer is 0.5 to 1.5. A method of manufacturing a reamer.
As a tapered drill reamer manufactured by the manufacturing method of claim 1 or 2,
The taper drill reamer is provided with a coolant groove (30),
The coolant grooves (30) are spirally formed along the outer circumferential surface of the shank (X) while being split into a plurality at the end of the shank (X), and each extending to the flute (10).

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