KR100609937B1 - Machining tool - Google Patents

Abstract

In order to increase the service life of the present invention, the spiral portion of the spigot 4 of the fuselage 2 and the insertion hole 6 of the corresponding knife head 5 can be made to be positive and non-active. (7) and the press-fitting part (8). Moreover, the large diameter part 9 by which the press part 8 of the knife head 5 is shrink-coupled is formed in the press part 8 of the fuselage 2.

Machining Tool, Spigot, Knife Head, Helix, Press-In

Description

Cutting Tool {MACHINING TOOL}

TECHNICAL FIELD The present invention relates to a cutting tool, and more particularly, to a cutting tool for processing a workpiece made of steel. The tool of the present invention is formed in the form of a rotating cutting tool, has a shank that can be clamped into the machine or the spindle, and a tool head is installed at the free end of the shank, The spike is integrally formed with the shank, and the knife head has an insertion hole as the insert holder, which is mounted on the insert with the insert holder tightly fitted in a non-positive manner. Can be screwed by.

Milling cutters, drills and rotary cutting tools are among the cutting tools. These tools have cutting edges which are often formed by mainly inserted cutting plates. The operator can use these tools to penetrate the workpiece more or less deeply, whereby the penetration depth depends on the robustness and stability of the tool. The coupling of the knife head and shank by screw connection is already known, according to which the shank is usually formed with a male thread and the knife head has a corresponding female thread. By combining them, they form a tool, which is combined into a machine or machine spindle and the workpiece material penetrates into the machine or machine spindle. Shanks of this type are typically made of tool steel so that the threaded insert can be manufactured economically. Moreover, the manner of integrally coupling the insert with the shank is known from the prior art, whereby the knife head has an insertion hole as the insert holder and the insert holder is mounted on the insert in a tightly fitted state, thereby providing frictional coupling. It can be tightened into the insert. In particular, these couplings between the shank and the tool head were found to be good. However, this type of coupling cannot guarantee accurate rotation. In addition, the shank is subject to great stress when the tool penetrates deeply into the workpiece, so even when it is made of steel, the shank may be deformed. .
A cutting tool consisting of a shank, clamping connector and knife head is known from US Pat. No. 5,899,642. The coupling between the clamping connection and the knife head is made by means of shape connection and friction connection, wherein the knife head is first fixed by the tool to the clamping connection before the clamping connection is fixed to the shank by the tool. In this embodiment of the prior art, it is necessary to use a clamping connection, which is expensive on the one hand to fix the knife head, and on the other hand, an unbalance problem occurs in the tool by using the clamping connection. It is believed to have shortcomings.

It is therefore an object of the present invention to solve these drawbacks of the prior art, in particular to provide a general-purpose cutting tool in which a coupling is made between the tool head and the shank, which ensures an improvement in the service life of the tool mounted on the machine spindle.

According to the present invention, the object is that the insertion portion of the shank and the corresponding insertion hole of the knife head have a threaded portion and a press-ait area, respectively, so that the shape connection coupling and the friction connection coupling are achieved. The overfit area is provided with an overdefined area, which is achieved by the shrink-fitted pressure fit of the knife head. The combination of the two arrangements in series between the shank of the tool and the knife head results in a combination that best satisfies the stress profile of the knife head in the material being cut. On the other hand, by screwing, a positive fit is formed between the insert and the knife head directly connected to the shank, so as to sufficiently ensure stability when pressure is applied in the axial and radial directions of the tool, On the other hand, it is ensured that the thread cannot be loosened by itself by a non-positive fit made by thermal shrink-fitting. On the one hand, the integrated coupling combination directly connected to the shank prevents the knife head from self-releasing from the shank, and on the other hand, the knife head is held at the center of the shaft due to the pressure fitting on the shank. This avoids unbalanced operation, which occurs in the case of conventional Nahap. Thus, such a combination of shank and knife head substantially increases the service life of the tool. The pressure fit may be formed in a cylindrical or conical shape.

According to another embodiment of the invention, the shank including the insert is made of a single piece of cemented or heavy metal and the knife head is made of steel, titanium or the like. In order to achieve the frictional engagement according to the invention, this frictional engagement can be formed by the heating process and released again. In this case, the knife head is first mounted on the shank in such a manner that the screw heads are engaged only after the knife head is subjected to heat treatment, whereby the knife head is heated to such an extent that it can be joined to the pressure fitting provided with the excess forming part. Since the expansion coefficient changes, the bonding can be easily performed in the heating process, and if necessary, the shank can be reused by being heated again and separated.

Referring to the present invention in more detail based on the accompanying drawings as follows.

1 shows a side view of a tool 1 with a knife head 5 for steel workpiece machining. In this case, the tool 1 is formed in the form of a rotating tool. The tool 1 has a shank 2 that can be clamped into the machine or the machine spindle, and a tool head 3 is installed at the free end of the shank. The insertion part 4 is formed integrally with the shank 2, and the knife head 5 has an insertion hole 6 as an insertion part holder. The insert holder can be mounted on the insert 4 to be tight and tightened to the insert 4 by frictional engagement. According to the invention, the insertion portion 4 of the shank 2 and the insertion hole 6 of the corresponding knife head 5 respectively have a screw portion 7 and a pressure fitting portion 8 in combination to form a shape connection. And a friction forming connection, and the pressure fitting portion 8 of the insert portion 4 has a surplus forming portion for performing heat shrink fitting of the pressure fitting portion 8 of the knife head 5. 9) is provided. The pressure fit 8 can be formed in a cylindrical or conical shape.

The shank 2 including the insert 4 is made of a single piece of cemented or heavy metal and the knife head 5 is made of steel, titanium or the like. This frictional engagement can be formed and released again by a heating process to achieve a frictional engagement according to the invention. In this case, the knife head 5 is inserted in the insert portion 4 and the knife head above the pressure fitting portion 8 of the excess forming portion 9 and the inserting portion 4 while being heated and heated in the engaging portion. The threads of (5) can be screwed together in such a way that they are screwed together. When the engaging portion is cooled, a combined coupling is made to the transition from the shank 2 to the knife head 5, which is formed by a shape coupling and a frictional coupling.

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Claims (4)

It is formed in the form of a rotating tool and has a shank that can be clamped into the machine or machine spindle, the free end of the shank being provided with a knife head, the insert being integrally formed with the shank, the knife head A cutting tool having an insertion hole as an insert holder, wherein the insert holder is mounted on the insert to be tightened and tightened to the insert by frictional engagement, the insert including 4 The shank 2 is integrally formed, and the insertion portion 4 of the shank 2 and the insertion hole 6 of the knife head 5 corresponding thereto are respectively a screw portion 7 and a pressure fitting portion 8. The shape fitting coupling and frictional coupling are made, but the pressure fitting portion 8 of the shank 2 is the pressure fitting portion of the knife head 5. A cutting tool, characterized in that the excess forming portion (9) is formed to perform the heat shrink fitting of (8). The cutting tool according to claim 1, wherein the pressure fitting portion (8) is formed in a cylindrical shape or a conical shape. 2. Cutting tool according to claim 1, characterized in that the shank (2) comprising the insert (4) is made of monolithic carbide or heavy metal and the knife head (5) is made of steel, titanium or the like. 4. The cutting tool according to any one of claims 1 to 3, wherein the frictional engagement is formed by a heating process and released again.

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