KR20020020706A - 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.

Description

Machining Tool {MACHINING TOOL}

The present invention relates to a machining tool, and more particularly to a machining tool for processing a workpiece made of steel. The tool of the present invention is in the form of a rotary cutting tool and has a fuselage which can be fixed to a machine tool or a spindle of the machine tool. The tool head is provided at an end of the fuselage, and a spigot is integrally formed in the fuselage, and a knife head is The spigot holder, with the insertion hole as the spigot holder, can be mounted to the spigot in a press-fitted state and fixed to the spigot in a non-active manner.

Milling cutters, drills and rotary cutting tools are the processing tools. These tools mainly have cutting edges constituted by insert-type cutting plates. The operator can use these tools to machine the workpiece deeply or shallowly, the depth of which depends on the robustness and stability of the tool. It is known to connect a knife head and a fuselage with a screw, and a spiral part is normally formed in the fuselage, and the corresponding spiral hole is formed in the knife head. By screwing them together, they make up the tool, which is screwed onto the machine tool or machine tool spindle for cutting the workpiece. Typically this type of fuselage is economically made of tool steel so as to make spiral spigots economically. Moreover, the connection method is known from the prior art in which the spigot is integrally molded to the fuselage, and the knife head has an insertion hole used as the spigot holder, and the spigot holder is mounted on the spigot in a press-fitted state and the spigot in a non-active manner. Can be fixed to the gut. In particular, these connections between the fuselage and the tool head were found to be good. However, this type of connection cannot guarantee accurate machining. Since the fuselage is subject to great stress when the tool penetrates deeply into the workpiece, even if the fuselage is made of steel, there is a problem that the balance is disturbed when the rotational speed is high and the machine tool or the machine tool spindle may be damaged.

It is therefore an object of the present invention to provide a general-purpose machining tool which allows for a connection between the tool head and the fuselage, which is free from these drawbacks of the prior art, and in particular in the machine tool spindle, can extend the service life of the tool.

According to the present invention, the object of this invention is that the spigot of the fuselage and the corresponding insertion hole of the knife head have a spiral portion and a press-fitting portion which allow the positive and non-active type connection to be made, respectively, and the press-fitting portion of the knife head is constricted. This is achieved by having a large diameter part that can be engaged. By the combination of the two tandem connections between the tool body and the knife head, the stress type of the knife head is such that the connection is most suitable for the workpiece material to be cut. On the one hand, a helical connection is made, so that an aggressive coupling is made between the spigot and the knife head, thereby ensuring sufficient stability when pressure is applied to the tool in the axial direction and the radial direction. The helix can be prevented from self-releasing. On the one hand, this integrated coupling combination prevents the knife head from loosening itself from the body, and on the other hand, the knife head is fixed to the shaft center by the press-fit of the body. This eliminates the non-equilibrium rotation seen in the case of a conventional spiral connection. As such, the linkage combination between the fuselage and the knife head substantially increases the service life of the tool. The indentation may be cylindrical or conical.

According to another embodiment of the present invention, the body comprising a spigot is made of a single light metal or heavy metal and the knife head is made of steel, titanium or the like. The connection and disconnection is made in the heating process so that the connection according to the invention is made. In this case, first, the knife head is coupled to the fuselage in a state in which the helix is not engaged until the knife head is heated, and then is heated enough to allow the knife head to be spirally coupled to the press-fitting portion provided in the large diameter portion. The connection can be easily made during the heating process by changing the expansion rate, and can be heated again and separated if necessary, so that the body can be used again.

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 which makes it possible, in particular, to work on steel workpieces. In this case, the tool 1 is configured in the form of a rotary tool. The tool 1 has a body 2 which can be fixed to a machine tool or machine tool spindle, and at the end of the body a tool head 3 is provided. The spigot 4 is molded integrally with the body 2 and the knife head 5 has an insertion hole 6 as a spigot holder. The spigot holder can be mounted on the spigot 4 in a press-fitted state and fixed to the spigot 4 in a non-active manner. According to the present invention, the spigot 4 of the fuselage 2 and the insertion hole 6 of the corresponding knife head 5 have a spiral portion 7 and a press-fitting portion so that a positive and non-active connection can be made. 8 and a large diameter portion 9 in which the indentation portion 8 of the knife head 5 is contracted to the press portion 8 of the spigot 4. The indentation 8 can be of cylindrical or conical shape.

The body 2 comprising the spigot 4 is made of a single piece of light metal or heavy metal and the knife head 5 is made of steel, titanium or the like. The connection and disconnection is made in the heating process so that the connection according to the invention is made. In this case, the knife head 5 is heated at its connecting portion so that the indentation portion 8 of the spigot 4 is coupled to the large diameter portion 9 and the spiral portion of the spigot 4 and the knife head 5 are separated. Rotation of the coupling takes place. When the connection is cooled, a combinational connection is made between the fuselage 2 and the knife head 5 and this combinational connection allows for positive and non-active coupling.

As such, the present invention provides a general purpose tool that allows a connection between the tool head and the fuselage to extend the service life of the tool in the machine tool spindle.

Claims (4)

It is configured in the form of a rotary tool and can be fixed to a machine tool or machine tool spindle, and has a tool head at the end, the spigot is integrally molded to the fuselage, and the knife head has an insertion hole as a spigot holder. In a processing tool for processing a steel workpiece, which is mounted on the spigot in a press-fit state and which can be fixed to the spigot in a non-active manner, the spigot 4 of the body 2 and the corresponding knife head 5 The insertion hole 6 of the knife head 5 has a spiral portion 7 and a press-fitting portion 8 so that the connection between the positive and non-active type can be made and the press-fitting portion of the knife head 5 at the press-fitting portion 8 of the body 2 8) is a processing tool, characterized in that the large diameter portion 9 is formed to shrink. The tool as claimed in claim 1, characterized in that the press-in portion (8) consists of a cylindrical or conical shape. The tool as claimed in claim 1, characterized in that the body (2) comprising the spigot (4) is made of a single light metal or heavy metal and the knife head (5) is made of steel, titanium or the like. 4. The processing tool according to any one of claims 1 to 3, wherein the connecting and separating heating is performed.