JPS6334813Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a split arbor for machine tools such as milling machines.

Generally, an arbor is a rod to which a cutter is attached, and is adapted to be attached to the main shaft of a milling machine. Conventionally, as shown in FIG. 1, one end of the arbor 1 is attached to the main shaft 2 of a horizontal milling machine, and the other end is attached to the arbor support 4 via a bearing member 3. It is known that it has a holding structure. When attaching a cutter (side milling cutter) 5 to this type of arbor 1, first insert the cutter 5 from the arbor support 4 side of the arbor 1, and position the cutter 5 between the main shaft 2 and the arbor support 4. . The arbor support 4 is then attached to an overarm (not shown) of the horizontal milling machine to support the end of the arbor 1, thereby preventing the tip of the arbor 1 from centering during rotation. By tightening the arbor nut 7, the cutter 5 is fixed to the arbor 1 via the arbor collar 8a, distance collar 8b, bearing member (bearing collar) 3, and end collar 8c. Note that the cutter 5 and the arbor 1 are connected by a key 6,
Of course, both are designed to rotate integrally.

However, the arbor 1 configured in this way
When attaching and removing the cutter 5 to and from the cutter 5, there are the following problems.

(1) Since the outer diameter of the cutter 5 is larger than the arbor mounting hole 4a of the arbor support 4, the cutter 5
The arbor support 4 must be removed from the arbor 1 when installing and removing it. However, since the arbor support 4 is not lightweight, replacing it requires considerable time and effort.

(2) When removing the cutter 5, the arbor nut 7, distance collar 8b, bearing member 3, and end collar 8c must all be removed from the arbor 1, and vice versa when installing the cutter 5. Because there is a cutter 5
Attaching and detaching is troublesome and time consuming.

This idea was made in view of the above problems, and by dividing the arbor so that it can be connected, there is no need to remove the arbor support and various collars, and the cutter can be replaced easily and quickly. The purpose of this invention is to provide a split-type arbor that can perform the following steps.

Hereinafter, one embodiment of this invention will be described in detail based on FIG. 2. 10 in the figure is an arbor, and this arbor 10 is composed of an arbor member 11 that is attached to the main shaft 2 of a milling machine in the same manner as before, and an arbor member 12 that is rotatably supported by an arbor support 4. 2 and arbor support 4
It is designed so that it is divided into two parts. Here, the arbor member 11 on the main shaft 2 side and the arbor member 12 on the arbor support 4 side will be explained. First, regarding the arbor member 11, the arbor member 11 is provided with a cutter attachment portion 13 on the arbor support 4 side to which the cutter 5 is attached. A screw hole 14 is formed in the central part of the split end of the cutter attachment part 13 (the end on the arbor support 4 side) in the axial direction. This screw hole 1
4 is for connecting with the other arbor member 12. Furthermore, a keyway 15 is formed in the outer peripheral surface of the cutter attachment portion 13 in the axial direction thereof. This is because a key member is attached inside to rotate the cutter 5 together with the arbor member 11.

Next, regarding the arbor member 12 on the side of the arbor support 4, this arbor member 12 has a threaded portion 16 at its divided end and a collar-shaped head 17 at the other end. is adapted to be removably screwed into the screw hole 14 of the arbor member 11. In this case, the axis of the arbor member 11 and the axis of the arbor member 12 coincide. Further, the brim-shaped head 17 is for rotating these arbor members 12.

Further, a bearing member 18 is rotatably supported on the arbor support 4, and the bearing member 18 has a fitting hole 18-a at its end on the main shaft 2 side into which the main shaft side arbor 12 is fitted. A through hole 18-b is provided along the axis of the through hole 18-b through which the arbor 12 on the arbor support 4 side is inserted.

The fitting hole 18-a is formed such that when the split end of the main shaft side arbor 11 is fitted into the fitting hole, the axis of the main shaft side arbor 11 and the axis of the bearing member 18 are aligned. ing.

Note that the end portion of the bearing member 18 where the fitting hole 18-a is provided is connected to the cutter 5 attached to the cutter attachment portion 13 of the arbor member 11.
It also serves as a so-called distance scarf that presses the shaft against the spindle 2 side.

In this case, the length of the bearing portion is preferably longer than the width of the arbor support 4. This is because when the cutter 5 is attached to and detached from the arbor member 11, the bearing member 18 is moved in the direction away from the arbor part 11, and the cutter 5 can be attached and detached between the bearing member 18 and the arbor member 11. This is to prevent the bearing member 18 from slipping out from the arbor support 4 even if the bearing member 18 is moved as described above.

In addition, 19 in the figure indicates the connecting member 12 and the bearing member 18.
and 20
is arbacara.

Next, a case will be described in which the cutter 5 is attached to the arbor 10 configured as described above. When attaching the cutter 5 to the arbor 10, the arbor member 12 and the bearing member 18 are spaced apart from the arbor member 11 in advance so that the distance between them and the arbor member 11 is larger than the width dimension of the cutter 5. put. At this time, the distance between the arbor support 4 and the arbor member 11 is set to the cutter 5.
It goes without saying that the width is larger than the width of the . After that, the cutter attachment part 1 of the arbor member 11 attached to the main shaft 2 of the milling machine
3, first, an appropriate number of arbor collars 20, 20 are attached and the attachment position of the cutter 5 is set. Then, the cutter 5 is moved and inserted between the arbor member 11 and the arbor support 4 in a direction perpendicular to their axes, and then moved and attached to the cutter attachment portion 13 of the arbor member 11 in the axial direction. do. In this case, the key groove of the cutter 5 is adapted to the key member in the key groove 15 of the attachment part 13. After that, the fitting hole 18-a of the bearing member 18 is fitted into the arbor member 11 on the main shaft side, and then the threaded portion 1 of the arbor member 12 on the arbor support side
6 is screwed into the screw hole 14 of the arbor member 11. In this case, it is not necessary to strongly tighten the screw member 16 into the screw hole 14, but simply to tighten the arbor member 11.
It is sufficient that the arbor member 12 and the arbor member 12 are connected. Then, when the collar-shaped head 17 of the connecting member 12 is tightened, the bearing member 18 is pressed against the main shaft 2 side via the washer 19, whereby the distance collar portion of the bearing member 18 moves the cutter 5 in the same direction (main shaft 2 As a result, the cutter 5 is attached to the arbor member 11, and the arbor members 11 and 12 are firmly screwed together. As a result, machining accuracy is not affected in any way during cutting by the cutter 5.

Moreover, when removing the cutter 5 from the arbor 10, the operation described above may be reversed.

Here, in the above-mentioned arbor 10, since it is divided into two arbor members 11 and 12, and the distance between the arbor member 11 and the arbor support 4 is set larger than the width dimension of the cutter 5, the cutter 5 is inserted between the arbor support member 11 and the arbor member 11 is then moved in the axial direction to attach it to the cutter attachment portion 13.

Therefore, when attaching and detaching the cutter 5, there is no need to move the arbor support 4, and the cutter 5
can be attached and detached easily and in a short time.

In this case, the arbor member 11 on the main shaft side is fitted into the fitting hole 18-a of the bearing member 18, and the arbor member 12 on the arbor support side is fitted into the through hole 18-b provided in the bearing member 18. 16 through the threaded portion of this arbor support member 12.
The cutter 5 is fixed to the arbor member 10 by screwing into a screw hole 14 provided in the arbor member 11 on the main shaft side.

Therefore, if the distance between the two points that support the arbor (distance between the main shaft and arbor support = approximately equal to the length of the so-called overarm) and the length of the arbor member on the main shaft side are the same, then the other Compared to the conventional method, the distance between the divided end of the arbor member on the main shaft side and the arbor support 4, that is, the space for replacing the cutter can be increased.

That is, for example, if the arbor member on the spindle side is provided with a threaded portion (male thread), the arbor member on the arbor support side is provided with a threaded hole (female thread), and these are simply connected by screws, when removing the cutter, The space for replacing the cutter is narrowed by the length of the threaded portion (male thread) of the arbor member on the main shaft side compared to the one of the present invention.

Therefore, the ability to keep the overarm short and have a wide cutter exchange space means that the support strength of the cutter is high and the cutter can be replaced with a cutter of various widths, allowing stable work to be carried out extremely efficiently. This means that the mobility of machine tools such as milling machines will be significantly improved.

In the above embodiment, the bearing member 18 has a structure in which the bearing part and the collar part are integrally formed, but the present invention is not limited to this, and the bearing part and the collar part are formed separately. Of course, it may be formed in the same manner.

Further, in the above embodiment, the diameter of the arbor member 11 is formed larger than the diameter of the arbor member 12, but the present invention is not limited to this, and for example, the diameters of the arbor member 11 and the arbor member 12 are They may be formed to have the same size. In this case, it goes without saying that the axis of the arbor member 11 and the axis of the arbor member 12 can be easily aligned.

As explained above, this invention divides the arbor installed between the main shaft of a machine tool and the arbor support, and fits the arbor member on the main shaft side into the fitting hole of the bearing member. Further, by inserting the arbor on the arbor support side into the through hole provided in the bearing member and screwing this arbor into the screw hole provided in the arbor member on the main shaft side, both the arbor can be freely attached and detached. Since it is a connected structure, just remove the screw connection between the two arbor members,
The cutter can be removed and there is no need to move the arbor support as in the conventional case, which not only simplifies the work of attaching and detaching the cutter, but also reduces the time it takes to attach and detach the cutter. The arbor support allows for a wider cutter replacement space while keeping the distance between the main shaft and the arbor support short (the length of the overarm), and allows the cutter to be replaced in a relatively small size. Since this can be done easily by attaching and detaching the side arbor members, stable machining can be performed extremely efficiently, which has the effect of significantly improving the performance of the milling machine.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a conventional arbor mounted on a milling machine, and FIG. 2 is a longitudinal sectional side view of the arbor according to the present invention mounted on a milling machine. 2... Main shaft, 4... Arbor support, 5... Cutter, 10... Arbor, 11... Arbor member on main shaft side, 12... Arbor member on arbor support side, 14... Screw hole, 16... Screw Part, 17...
Flange-shaped head, 18...bearing member.

Claims (1)

[Scope of utility model registration request] In an arbor for mounting a cutter, one end of which is fixed to the main shaft of a machine tool and the other end rotatably supported by an arbor support via a bearing member, this arbor is connected to the main shaft. The arbor member on the main shaft side is divided between the arbor support and the arbor member on the main shaft side.A screw hole is provided in the split end of the arbor member on the main shaft side, and the arbor member on the arbor support side is provided with a screw hole in the split end of the arbor member on the main shaft side. A threaded portion that can be screwed is provided, and a collar-like head is provided at the other end, and the bearing member has a fitting in which the split end of the main shaft side arbor fits into the main shaft side end of the bearing member. A mating hole is provided, and a through hole is provided along the axis of which the arbor on the arbor support side is inserted, and the distance between the split end of the arbor member on the main shaft side and the arbor support is such that the distance between the split end of the arbor member on the main shaft side and the arbor support is The cutter is attached to the arbor member on the main shaft side, and the arbor on the arbor support side is inserted from the arbor support side into the through hole of the bearing member to cut the divided end of the arbor member on the main shaft side. A split-type arbor characterized in that the two arbors are removably connected by screwing a threaded portion of the arbor member on the arbor support side into the screw hole of the arbor, and the cutter is removably attached.