KR20050011352A - A front head clamping assembly of boring bar - Google Patents

Abstract

PURPOSE: An assembling apparatus of an end head part of a boring bar is provided to combine the insert part with the shank part repeatedly and firmly by forming the insert part, the shank part and the connecting part. CONSTITUTION: An end head assembling apparatus(100) of a boring bar is composed of an insert part(110) having a first assembling hole(116) including a first female screw(120) in the inner periphery, a shank part(140) having a second assembling hole(142) including a second female screw(144) in the inner periphery, and a connecting part(130) having a first assembling bar(132a) and a second assembling bar(132b) including a first male screw(134a) and a second male screw(134b) combined with the first assembling hole and the second assembling hole by the opposite threads. The shank part is contacted to the insert part by the connecting part. First pin holes are formed outside the first assembling hole and combined with plural connecting pins. Second pin holes are formed outside the second assembling hole to guide the connecting pins.

Description

A front head clamping assembly of boring bar}

The present invention relates to a leading head coupling device of the boring bar, and more particularly, to the cut and shank portion formed with the first coupling hole and the second coupling hole communicating with each other, and the first coupling hole and the second coupling hole, respectively. At the same time, the connection part that is screwed together can be strongly fastened to the pickled portion and the shank portion, thereby providing high reliability to the consumer. will be.

Generally, a cutting tool is a tool used for processing steel or nonferrous workpieces into a shape desired by an operator. These cutting tools can be divided into milling tools and turning tools depending on the shape. In addition, various shapes of tools are used for optimum cutting performance according to processing purpose, processing range, workpiece shape, or workpiece material.

The above-described cutting tool can be largely divided into an insert portion which actually performs cutting and a shank portion that is inserted into and fixed to an arbor for a machine tool. The cutting tool thus formed has a limitation in the application area of the cutting tool because the cutting and shank portions are integrated. For this reason, conventionally, in order to change the picking shape or change the length and material of the shank part, it is necessary to purchase an additional cutting tool or to make a customized product in order to apply the optimum cutting tool that the user wants. There was a problem.

In order to solve the above-mentioned problems of the prior art, a modular clamping system has been developed and used that separates the cutting tool and the shank part of the cutting tool, and allows the cutting tool of the required shape to be combined with the shank part. . Such a modular clamping system has the advantage of being able to apply various shapes of pickles to one shank portion and to arbitrarily adjust the length of the shank portion. However, when the combined fastening is weak due to the use of the separated pickled portion and the shank portion, there is a problem that the cutting capacity may be reduced by vibration during use. Therefore, in a cutting tool using a modular clamping system, a fastening device for joining the pickled portion and the shank portion plays an important role. Therefore, in this technique, high precision, strong fastening and high reliability must be secured accordingly.

In order to solve the above problems, various methods have been provided. However, the structure of the pickling and shank portions which are coupled to each other is complicated, and there is a problem in economic value.

The present invention has been made to solve the conventional problems as described above, the object of the present invention is a cut and shank portion formed with the first coupling hole and the second coupling hole communicating with each other, the first coupling hole and the second By providing a joint that is screwed into the coupling hole at the same time, the pickled portion and the shank portion can be tightened strongly to obtain high reliability for the consumer, and the boring bar's tip head portion that can be repeatedly fastened to the pickled portion and the shank portion is combined. To provide a device.

1 is an exploded view showing the distal end head coupling device of the boring bar according to the present invention, and

Figure 2 is a cross-sectional view of the coupling state of the leading head coupling unit of the boring bar shown in FIG.

Explanation of symbols on the main parts of the drawing

100: end head coupling device of the boring bar 110: pickled portion

112: cutting insert 116: first coupling hole

118: wrench guide 120: the first female thread

122: first pin hole 124: connecting pin

130: connecting portion 132a: first coupling band

132b: 2nd engagement table 134a: 1st external thread

134b: 2nd external thread 136a: 1st wrench insertion groove

136b: second wrench insertion groove 140: shank portion

142: second coupling hole 144: second female thread

146: second pin ball

In order to achieve the object of the present invention as described above, the present invention,

It has a pickled portion formed with a settled groove in which the cutting insert is settled on the upper surface so as to perform cutting, a connecting portion fastened to the pickled portion, and a shank portion mounted to the arbor of the machine tool while being connected to the pickled portion by the connecting portion. In the boring bar front end head coupling device;

The other end of the pickled portion is formed with a first inclined hole extending downwardly to the inside of the pickled portion and a wrench guide hole penetrating from the end of the first coupling hole to one end of the pickled portion, the connecting portion is a cylindrical fastened to the first coupling hole And a cylindrical second coupling unit integrally formed on the first coupling stage and the first coupling stage, and having a predetermined inclination toward the upper side of the shank portion so as to communicate with the first coupling hole at one end of the shank portion and extending the second coupling stage. A second coupling hole to which the coupling table is fastened is formed to provide a tip head coupling device of the boring bar in which the other end of the pickled portion and one end of the shank portion are in close contact by the rotating connecting portion.

As described above, according to the present invention, by providing a cutting portion and shank portion each formed with the first coupling hole and the second coupling hole communicating with each other, and the connection portion screwed to the first coupling hole and the second coupling hole at the same time In addition, the pickled portion and the shank portion can be tightened strongly to obtain high reliability to the consumer, and the pickled portion and the shank portion can be repeatedly tightened.

Hereinafter, with reference to the accompanying drawings will be described with respect to the head head coupling device of the boring bar according to an embodiment of the present invention.

1 is an exploded view showing the distal end head coupling device of the boring bar according to the present invention, and Figure 2 is a cross-sectional view of the coupling state of the head head coupling device of the boring bar shown in FIG.

1 and 2, the tip head portion coupling device 100 of the boring bar according to the present invention is a pick-up (insert) 110 for performing the cutting, the connecting portion 130 is fastened to the pick-up section 110 and It is provided with a shank portion (140) which is connected to the pickling portion (110) by a connecting portion (130) and mounted to an arbor (not shown) of the machine tool.

First, the pickled part 110 is formed with a settling groove 114 in which the cutting insert 112 is placed on an upper surface thereof, and a first coupling hole 116 and a wrench guide hole 118 are formed therein. At this time, the first coupling hole 116 extends with a predetermined inclination from the center of the other end of the pickling portion 110 to the inner lower side of the pickling portion 110, and likewise, the wrench guide hole 118 is the first coupling hole 116. The cutting insert 112 extends through one end of the cutout 110 with a predetermined inclination so that the cutting insert 112 does not interfere with the settling groove 114 where it is placed. Preferably, the first female screw 120 is formed on the inner circumferential surface of the first coupling hole 116. On the other hand, a plurality of first pin holes 122 are formed at the other end of the pickled portion 110 in the radially outer side of the first coupling hole 116, and one end of the plurality of connection pins 124 is formed in the first pin hole 122. This is combined and the other end is combined to be exposed to the outside. The connection portion 130 is mounted to the pickled portion 110 formed as described above.

The connecting portion 130 has a cylindrical first coupling table 132a and a second coupling table 132b integrally formed with the first coupling table 132a. A first male screw 134a corresponding to the first female screw 120 is formed on the outer circumferential surface of the first coupling table 132a so as to be coupled to the first coupling hole 116 of the pickled portion 110, and the second The second male screw 134b is formed on the outer circumferential surface of the coupling table 132b. At this time, the first wrench insertion groove 136a and the second wrench insertion groove 136b are formed on the extended ends of the first coupling table 132a and the second coupling table 132b, respectively. Preferably, the first male screw 134a is a left hand screw with the thread extending to the left, and the second male screw 134b is a right hand screw with the thread extending to the right. More preferably, the first male screw 134a is a left hand screw with the thread extending to the right, and the second male screw 134b is a left hand screw with the thread extending to the left.

Meanwhile, the shank unit 140 includes a second coupling hole 142 to which the second coupling table 132b of the connection unit 130 is fastened. The second coupling hole 142 extends inwardly with a predetermined inclination upward from the center of one end of the shank portion 140 so as to communicate with the first coupling hole 116. The second female thread 144 corresponding to the second male thread 134b is formed on the inner circumferential surface of the second coupling hole 142. In addition, a second pin hole 146 corresponding to the first pin hole 122 is formed at one end of the shank part 140 in the radially outer side of the second coupling hole 142. The second pin hole 146 guides the other end of the connecting pin 124, one end of which is fitted into the first pin hole 122. Preferably, the first female screw 120 is a left hand screw with the thread extending to the left, and the second female screw 144 is a right hand screw with the thread extending to the right. More preferably, the first female screw 120 is a left hand screw with the thread extending to the right, and the second female screw 144 is a left hand screw with the thread extending to the left.

The following briefly describes the coupling state of the tip head coupling device 100 of the boring bar formed as described above.

First, the first coupler 132a and the second coupler 132b of the connecting portion 130 are coupled to the first coupling hole 116 of the pickled portion 110 and the second coupling hole 142 of the shank portion 140. Place it adjacent to. Under such a condition, the operator removes the end of the wrench under a state in which a wrench (not shown) is inserted into the wrench guide hole 118 formed inwardly from one end of the pickled portion 110 and penetrated to the other end side of the pickled portion 110. 1 is inserted into the first wrench insertion groove 136a formed in the coupling table 132a. When the wrench is inserted into the first wrench insertion groove 136a, the connecting pin 124 is inserted into the first pin hole 122 of the pickled part 110 and the second pin hole 146 of the shank part 140 is connected. When the wrench is rotated under the state in which the pin 124 is disposed in close proximity, the connecting portion 130 is rotated by the wrench. At this time, the first male screw 134a and the second male screw 134b formed in the first coupling table 132a and the second coupling table 132b of the connecting portion 130 may include the first coupling hole 116 and the second coupling hole. The other end surface of the pickled portion 110 and one end surface of the shank portion 140 are brought into close contact with the first female screw 120 and the second female screw 144 formed at 142, respectively. At this time, the connecting pin 124 exposed from the first pin hole 122 is fitted into the second pin hole 146 of the shank portion 140.

As described above, the tip head coupling device 100 of the boring bar according to the present invention is a pickled portion 110 having a first coupling hole 116, the first female screw 120 is formed on the inner peripheral surface, and the inner peripheral surface The shank portion 140 having the second coupling hole 142 having the second female thread 144 formed therein, and threads formed in a direction corresponding to each other, are formed in the first coupling hole 116 and the second coupling hole 142. By providing a connecting portion 130 having a first coupling rod 132a and a second coupling rod 132b in which the first male screw 134a and the second male screw 134b are fastened, the pickled portion 110 and the shank portion are provided. Not only can the problem of fastening force dropping sharply due to the wear phenomenon of the connection part 140, but also has the advantage that can be repeatedly fastened the pickled portion 110 and the shank portion 140.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims You will understand.

Claims (7)

It is mounted to an arbor of a machine tool while being connected to the pickled portion by the pickled portion formed with a settling groove in which a cutting insert is settled on the upper surface, the connecting portion fastened to the pickled portion, and the connecting portion so as to perform cutting. In the boring bar tip head coupling device having a shank portion; The other end of the pickled portion is formed with a first coupling hole extending with a predetermined inclination toward the lower side of the pickled portion and a wrench guide hole penetrating from the end of the first coupling hole to one end of the pickled portion, wherein the connection portion is formed in the first portion. A cylindrical first coupling table fastened to a coupling hole and a cylindrical second coupling table integrally formed with the first coupling table, and at one end of the shank portion, an inner upper side of the shank portion to communicate with the first coupling hole; The other end of the pickled portion and one end of the shank portion is in close contact by the connecting portion is formed by the second coupling hole is formed to rotate and has a predetermined inclination and the second coupling unit is fastened to the front head coupling of the boring bar Device. The method of claim 1, wherein the first female thread and the second female thread are formed on the inner circumferential surface of the first coupling hole and the second coupling hole, respectively, and a plurality of first pin holes are formed on the radially outer side of the first coupling hole. One end of the plurality of connecting pins are coupled, the head coupling portion of the head boring bar, characterized in that the radially outer side of the second coupling hole is formed a second pin hole to guide the other end of the connecting pin. The boring bar tip head coupling device according to claim 2, wherein the first female screw is a left hand screw with the thread extending to the left, and the second female screw is a left hand screw with the thread extending to the right. The boring bar tip head coupling device according to claim 2, wherein the first female screw is a left hand screw with a thread extending to the right, and the second female screw is a left hand screw with the thread extending to the left. The first and second male threads corresponding to the first female thread and the second female thread are formed on the circumferential surfaces of the first coupler and the second coupler of the connecting portion, wherein the first coupler is formed. And a first wrench insertion groove and a second wrench insertion groove are formed on the extension end of the base and the second coupler, respectively. 6. The boring bar tip head coupling device according to claim 5, wherein the first male screw is a left hand screw extending to the left and the second male screw is a left hand screw extending to the right. 6. The boring bar end head coupling device according to claim 5, wherein the first male screw is a left hand screw with a screw thread extending to the right, and the second male screw is a left hand screw with a screw thread extending to the left.