KR20090099804A - Quick-change cutter assembly and clamping screw assembly mounted thereto - Google Patents

Abstract

PURPOSE: A quickly changeable cutter assembly and a clamping screw assembly mounted on the same are provided to prevent abrasion on a projection of a hook part of a cutter slot due to repetitive rolling friction contact with a clamping screw. CONSTITUTION: A quickly changeable cutter assembly comprises a clamping screw consisting of a head and a post, and a ring washer coupled on the outer circumference of a post. The post comprises a threaded portion in which a male screw is formed at the end opposite to a head and a sliding potion between the threaded portion and the head without a screw. In the washer, a female screw is formed to correspond to the male screw. The inner diameter(D1) of the washer is lower than the external diameter(D2) of the screw thread of the threaded portion and is bigger than the external diameter(d) of the sliding portion. The length(T) of the sliding portion is longer than the thickness(t) of a washer. The washer is positioned on the sliding portion and is rotated.

Description

Quick-change cutter assembly and clamping screw assembly mounted {

The present invention relates to a cutter assembly and a clamping screw assembly mounted thereto, and more particularly, to a cutter and a clamping screw assembly capable of preventing abrasion of a specific part by repeated contact.

Generally, a workpiece processing machine, such as a milling machine, includes a cutter mounted on a rotating shaft and rotating, and a plurality of cutting inserts mounted on the cutter. The rotating shaft is equipped with a mounting head, and the cutter is fixed to the mounting head through a plurality of clamping screws.

1A is a perspective view of a general cutter used in a milling machine, showing a cutter 1 with a number of cutting inserts 2 mounted thereon. The cutter 1 having such a structure is mounted to a mounting head (not shown) fixed to the rotating shaft. A plurality of long holes 1A are formed in the cutter 1, and a fastening hole corresponding to each of the long holes 1A of the cutter 1 is formed in the mounting head.

The clamping screw 3 used to fasten the cutter 1 to the mounting head of the milling machine comprises a spiral portion 3A having a predetermined length and a head portion 3B formed on top of the spiral portion 3A.

FIG. 1B is a detailed plan view of the long hole shown in FIG. 1A, together with the clamping screw 3 inserted in the long hole 1A. Each long hole 1A of the cutter 1 extends in the circumferential direction, and is formed by a release area 1A-1 formed at one corner thereof and a jaw S formed along an intermediate depth line along the inner wall of the remaining area. It is divided into limited locking area portions 1A-2. Therefore, the engaging region 1A-2 is divided into an upper wall and a lower wall on the basis of the middle line, and the upper surface of the jaw portion S has a lower level than the outer surface of the cutter in the depth direction of the long hole and faces the lower wall. The gap between is smaller than the gap between the top walls.

The release area 1A-1 of the long hole 1A has a size that allows the head 3B of the clamping screw 3 to pass through, and the clamping screw 3 has a locking area 1A- of the long hole 1A. When positioned at 2), the head 3B of the clamping screw 3 is retained in the upper wall of the locking area portion 1A-2, the spiral portion 3A in the lower wall, and the lower surface of the head 3B is Contact the upper surface of the jaw (S).

That is, in the state in which the cutter 1 and the mounting head of the milling machine are engaged, the spiral portion 3A of the clamping screw 3 is spirally engaged with the fastening hole of the mounting head, and the bottom of the head 3B is the cutter 1 It is in close contact with the upper surface of the jaw portion S of the engaging region portion 1A-2 of the long hole 1A (left side of Fig. 1B).

In the cutting process of the workpiece using the milling machine, the cutting edge portion of the cutting insert 2 mounted on the cutter 1 is worn, so the cutting insert 2 should be replaced periodically with a new cutting insert. For the convenience of this replacement, the cutter 1 is first detached from the mounting head, the cutting insert 2 worn out in the cutter 1 is replaced, and the cutter 1 is then remounted in the mounting head.

At this time, in order to separate the cutter 1 from the mounting head of the milling machine, it is not necessary to completely remove each clamping screw 3 from the fastening hole of the mounting head of the milling machine.

That is, when replacing the cutter 1, the clamping screw 3 is partially relaxed at the fastening hole of the mounting head of the milling machine, so that the head 3B of the clamping screw 3 is the long hole 1A of the cutter 1. When spaced apart from the upper surface of the jaw portion S of the locking area portion 1A-2 of the upper surface, the cutter 3 is shifted in the circumferential direction (arrow direction in FIG. Coincides with the release region 1A-1 (right side in Fig. 1B). In this state, the cutter 1 can be released or returned from the mounting head.

By returning the cutter replaced with a new insert, the cutter 1 is circumferentially reversed with each clamping screw 3 corresponding to the release area 1A-1 of the long hole 1A of the cutter 1 (Fig. Shifting in the direction opposite to the arrow of 1b), the head 3B of the clamping screw 3 is located on the jaw portion S of the locking area portion 1A-2 of the long hole 1A (left side in Fig. 1B).

In this state, when the clamping screw 3 is firmly tightened in the fastening hole of the mounting head, the bottom surface of the head 3B is the jaw portion S of the engaging region 1A-2 of the long hole 1A of the cutter 1. It is pressed on the upper surface. Thus, the cutter 1 is firmly mounted to the mounting head by this clamping screw 3.

As described above, as the cutter 1 is detached and fastened from the mounting head repeatedly, the jaw portion S formed in the engaging region 1A-2 of the long hole 1A of the cutter 1 and the clamping contact therewith. The head portion 3B of the screw 3 is exposed to repeated wear.

In particular, the jaw portion S of the engaging region portion 1A-2 of the long hole 1A of the cutter 1 has a narrow width, and the contact pressure is concentrated on the edge of the jaw. The problem arises that it is easily damaged and the expensive cutter life is limited.

The present invention is to solve the above problems of damage caused when the cutter having a long hole divided into the release area and the engaging area by repeatedly separating and joining the mounting head, an object of the present invention is to The present invention provides a clamping screw assembly and a cutter assembly using the same, which can prevent abrasion of the jaw portion of the cutter long hole due to repeated rotating frictional contact.

Clamping screw assembly according to the present invention for achieving the above object includes a clamping screw consisting of a head and a post and a ring washer coupled to the post outer peripheral surface. Here, the post has a threaded portion formed with a male thread on the opposite end side of the head and a sliding portion without a screw formed between the threaded portion and the head, and the washer is formed with a female thread corresponding to the male thread on the inner side.

In particular, the threaded inner diameter of the washer is smaller than the threaded outer diameter of the spiral portion of the clamping screw and larger than the outer diameter of the sliding portion, the length of the sliding portion is longer than the thickness of the washer, and the washer is located on the sliding portion and can be freely rotated. Do.

On the other hand, the clamping screw has a pin hole at a point spaced by the thickness of the washer from the lower surface of the head on the outer peripheral surface of the post, and further includes a support pin protruding into the pin hole smaller than the height of the thread of the post spiral portion, By being supported by the support pin, it is possible to maintain the state close to the lower surface of the head.

Meanwhile, the present invention discloses a cutter assembly including a cutter having a plurality of holes, a mounting head having a plurality of fastening holes corresponding to the long holes, and a clamping screw assembly coupled to the long holes and the fastening holes.

Each long hole of the cutter constituting the cutter assembly extends in the circumferential direction and is located at one corner thereof and has a release area having a size through which the head of the clamping screw can pass, and a jaw formed along the inner wall middle line of the remaining area. The clamping screw is divided into a locking area provided, and the clamping screw is positioned on the locking area and tightened to the screwing hole of the mounting head, so that the washer is pressed between the lower surface of the clamping screw head and the upper surface of the jaw portion of the long hole.

Here, the outer diameter of the washer is preferably equal to or smaller than the size of the head diameter of the clamping screw, and larger than the size of the jaw gap of the engaging region of the long hole of the cutter.

The clamping screw assembly and the cutter assembly using the same according to the present invention as described above, even if the cutter and the mounting head is repeatedly separated and combined, direct rotational friction of the jaw portion of the engaging region of the head of the clamping screw and the cutter long hole The contact is prevented, thereby preventing the wear of the head and the cutter of the clamping screw, thereby increasing the life of the cutter significantly.

Hereinafter, a clamping screw assembly according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 2a is an exploded perspective view of the clamping screw assembly according to the first embodiment of the present invention, Figure 2b is a cross-sectional view taken along the center line of Figure 2a.

The clamping screw assembly 10 according to the first embodiment of the present invention includes a clamping screw 11 and a washer 12 mounted to the clamping screw 11.

The clamping screw 11 includes a cylindrical post 11A having a predetermined length and a head 11B integrally formed on top of the cylindrical post 11A. The post 11A has a spiral portion 11A-1 having a male screw on the opposite end side of the head 11B, and a sliding portion 11A- without a screw formed between the spiral portion 11A-1 and the head 11B. 2).

The post 11A of the clamping screw 11 is inserted into the long hole M1 of the cutter (M in FIG. 4) and the fastening hole of the mounting head (not shown, but a spiral is formed on the inner circumferential surface), and is thus coupled to the spiral. The mounting head is integrated by the clamping screw 11.

The head portion 11B of the clamping screw 11 has a hole corresponding to the shape of a fastening tool, for example a hexagon wrench (not shown). Alternatively, a groove (not shown) for accommodating the blade of the screw driver may be formed in the top surface of the head portion 11B.

The washer 12 fastened to the clamping screw 11 is a disk-shaped ring-shaped member having a predetermined thickness, and an internal thread corresponding to the male thread 11A-1 of the post 11A of the clamping screw 11 is formed on the inner side thereof. Is formed. The washer 12 is mounted on the outer circumferential surface of the sliding portion 11A-2 adjacent to the head portion 11B of the clamping screw 11.

3 is a perspective view of the clamping screw assembly showing a state in which the washer shown in FIG. 2A is mounted to the clamping screw, wherein the washer 12 is a sliding portion 11A-2 adjacent to the head portion 11B of the clamping screw 11. The state attached to the outer peripheral surface of the figure) is shown. The washer is located on the sliding portion and can be freely rotated, which will be described later in detail.

Meanwhile, 4 is a partially separated perspective view of the clamping screw assembly shown in FIGS. 2A and 3 and a cutter mounted to the mounting head of the milling machine.

As shown in FIG. 4, the washer 12 is mounted with the cutter using the clamping screw assembly 10 mounted on the outer circumferential surface of the sliding portion 11A-2 adjacent to the head portion 11B of the clamping screw 11. When the head (only the cutter is shown in FIG. 4) is fastened, the washer 12 located below the head 11B of the clamping screw 11 is freely rotatable with respect to the head, and the corresponding cutter M is opened. It comes in close contact with the jaw formed in M1.

Meanwhile, the configuration of the long hole M1 of the cutter M shown in FIG. 4 is the same as that of the long hole 1A of the cutter 1 shown in FIG. 1B, and the washer 12 is provided in the clamping screw assembly according to the present invention. ), Except that the clamping screw assembly is not completely separated from the mounting hole of the mounting head, the head 11B of the clamping screw 11 is released from the hole 1A of the cutter M. In accordance with the portion 1A-1, the process of returning the cutter M, shifting the cutter M in the circumferential reverse direction, and then fixing the cutter M to the mounting head by tightening the clamping screw assembly is basically performed. Same as the prior art. Therefore, duplicate description thereof will be omitted.

By the above washer 12, the head 11B of the clamping screw 11 and the jaw portion of the engaging region of the long hole M1 of the cutter M do not directly contact each other, and the head 11B is on the washer 12. By sliding, even if pressing and loosening of the clamping screw 11 with respect to the cutter M is repeatedly performed, the engaging region of the long hole M1 of the cutter M is held by the head portion 11B of the clamping screw 11. The chin is not worn.

 By the function of preventing the wear of the washer 12, even if the clamping screw assembly 10 is repeatedly pressed or loosened to the cutter (M), the jaw formed in the engaging region of the long hole (M1) of the cutter (M) It is possible to maintain the original shape, so that the clamping screw assembly 10 allows the cutters to be repeatedly fastened over a long period of time.

Hereinafter, the structure, mutual coupling and action of the clamping screw assembly according to the present invention will be described in more detail with reference to the drawings.

As shown in FIG. 2, a spiral corresponding to the spiral formed on the spiral portion 11A-1 of the clamping screw 11 is formed on the inner circumferential surface of the washer 12. The washer 12 having such a structure passes through the spiral portion 11A-1 of the clamping screw 11 while rotating and is mounted on the sliding portion 11A-2 to form a clamping screw assembly.

Here, the thread inner diameter D1 of the washer 12 is smaller than the thread outer diameter D2 of the spiral portion 11A-1 of the clamping screw 11 and larger than the outer diameter d of the sliding portion 11A-2. Further, the length T of the sliding portion 11A-2 of the clamping screw 11 is longer than the thickness t of the washer. Due to this structure, the washer 12 is located on the sliding portion 11A-2 of the clamping screw 11 and is freely rotatable, while the sliding portion of the clamping screw 11 is not rotated unless it is intentionally rotated. 11A-2).

As described above, the action that the washer 12 is restrained on the sliding portion 11A-2 adjacent to the head 11B in a freely rotatable state is a critical function in the practice of the present invention. If, as described above, in the process of fixing the cutter (M) to the mounting head, the head (11B) of the clamping screw 11 to the cutter (M) in the state that the clamping screw assembly is not completely separated from the fastening hole of the mounting head When the cutter M is shifted in the circumferentially reverse direction to coincide with the release area portion 1A-1 of the long hole 1A, the washer 12 separates from the sliding portion 11A-2 adjacent to the head 11B. This is because the washer 12 interferes with the jaw portion of the locking area of the long hole M1 if it flows down, so that a smooth reverse circumferential shift cannot be performed. Also, if the washer 12 does not rotate freely with respect to the head 11B when tightening the clamping screw assembly, wear of the jaw portion of the engaging region of the long hole M1 cannot be prevented.

In addition, the head 11B and the washer 12 are held together in the upper wall of the long hole M1 while the washer 12 is supported on the upper surface of the jaw so that the outer diameter of the washer 12 may be clamped. It is needless to say that the diameter of the head 11B of (11) is equal to or smaller than the gap of the engaging region of the long hole M1 of the cutter M (that is, the gap between the facing jaws).

In addition, the hardness of the washer 12 is greater than the hardness of the clamping screw 11 and smaller than the hardness of the cutter M, thereby increasing the structural support function of the washer 12 and reducing the relative wear of the cutter M. It is preferable.

The clamping screw 11 of the clamping screw assembly 10 according to an embodiment of the present invention has a pin hole at a point spaced from the lower surface of the head 11B by the thickness of the washer 12 on the outer circumferential surface of the post 11A. The support pin 11C is attached to this pin hole. The support pin 11C supports the washer to maintain the state closer to the lower surface of the head, and has a complementary function to prevent the washer 12 from being released from the sliding portion 11A-2. It is preferable that the height of the support pin is smaller than the thread of the post spiral, so that the support pin 11C does not scratch and damage the upper surface of the jaw portion in the engaging portion M1.

5 is a perspective view of a clamping screw assembly according to a second embodiment of the invention.

The sliding portion 110A-2 of the clamping screw 110 according to the present embodiment is equipped with one or more support pins 110C, preferably three support pins. Except for the fact that the sliding screw assembly 100 according to the present embodiment is the sliding portion (110A-2) is formed longer than the first embodiment, the rest of the configuration and operation is the same, so that duplicate description is omitted.

Preferred embodiments of the present invention described above are disclosed for purposes of illustration, and those skilled in the art having various ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention. And additions should be considered to be within the scope of the following claims.

1A is a perspective view of a typical cutter used in a milling machine.

FIG. 1B is a detailed plan view of the long hole shown in FIG. 1A; FIG.

2A is an exploded perspective view of the clamping screw assembly according to the first embodiment of the present invention.

FIG. 2B is a cross-sectional view taken along the line 2b-2b in FIG. 2A. FIG.

FIG. 3 is a perspective view of the clamping screw assembly showing the washer shown in FIG. 2A mounted to the clamping screw. FIG.

4 is a perspective view of a partial separation of the clamping screw assembly and cutter of the milling machine shown in FIGS. 2A and 3;

5 is a perspective view of a clamping screw assembly according to a second embodiment of the present invention.

Claims (8)

A clamping screw assembly comprising a clamping screw consisting of a head and a post and a ring washer coupled to the post outer circumferential surface,  The post has a threaded portion formed with a male thread on an opposite end side of the head and a non-screwed portion between the spiral portion and the head, and the washer has an internal thread corresponding to the male screw on an inner side thereof. The thread inner diameter D1 of the washer is smaller than the thread outer diameter D2 of the spiral portion of the clamping screw and is larger than the outer diameter d of the sliding portion, and the length T of the sliding portion is longer than the thickness t of the washer, And the washer is rotatably located on the sliding portion. The clapping screw assembly of claim 1, wherein the outer diameter of the washer is the same size as the head diameter of the clamping screw. The clapping screw assembly of claim 1, wherein a hardness of the washer is greater than a hardness of the clamping screw. The clamping screw of claim 1, wherein the clamping screw has a pin hole on a post circumferential surface spaced apart from the lower surface of the head by the thickness of the washer. And a support pin protrudingly inserted into the pin hole smaller than the height of the thread of the post helix, such that the washer is supported by the support pin to maintain the state close to the bottom surface of the head. In a cutter assembly comprising a cutter having a plurality of holes, a mounting head having a plurality of fastening holes corresponding to the long holes, and a clamping screw assembly coupled to the long holes and fastening holes, The clamping screw assembly includes a clamping screw consisting of a head portion and a post portion and a ring washer coupled on the outer circumferential surface of the post portion, The post portion includes a spiral portion having a male thread formed on an opposite end side of the head portion and a non-screwed portion between the spiral portion and the head portion, and the washer has an internal thread corresponding to the male screw formed on an inner surface thereof. The thread inner diameter D1 of the washer is larger than the outer diameter d of the sliding part, the length T of the sliding part is longer than the thickness t of the washer, and the washer is located on the sliding part, Each long hole of the cutter extends in the circumferential direction, and is located at one corner of the cutter and has a release area having a size through which the head of the clamping screw can pass, and a locking area including a jaw formed along an inner wall middle line of the remaining area. Delimited, The clamping screw is located on the engaging area and tightened to the screwing hole of the mounting head, so that the washer is pressed between the lower surface of the clamping screw head and the upper surface of the jaw portion of the long hole. . The cutter assembly according to claim 5, wherein the outer diameter of the washer is equal to or smaller than the size of the head diameter of the clamping screw and is larger than the size of the jaw gap of the engaging region of the long hole of the cutter. 6. The cutter assembly of claim 5 wherein the hardness of the washer is greater than the hardness of the clamping screw and less than the hardness of the cutter. 6. The clamping screw according to claim 5, wherein the clamping screw has a pin hole on a post circumferential surface spaced apart from the lower surface of the head by the thickness of the washer. And a support pin protruding into the pin hole smaller than a height of a thread of the post helix.

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