JPH08257823A - Rotary tool supporting device - Google Patents

Abstract

PURPOSE: To prevent the chattering vibration of a rotary tool by providing a reporting member independently from a spindle, the member having a supporting surface slidingly coming into contact with a sliding surface formed circular in its section in an outer peripheral part in the vicinity of the machining part of the tip of the rotary tool. CONSTITUTION: A rotary supporting member 5 supports a supporting member 6 having a supporting surface 6a slidingly coming into contact with the sliding surface 4b of an end mill 4 and is enabled to rotate with the rotary shaft of the end mill 4 as a rotary center independently from a spindle 1. Machining is performed by rotating the end mill 4 while keeping the supporting surface 6a of this supporting member 6 in contact with a sliding surface 4b. A cutting force almost backward in a feeding direction and perpendicular to the rotary shaft, being applied to the end mill 4 during cutting work is received by the supporting member 6 via a contact part between the sliding surface 4b and the supporting surface 6a. Thus, chattering vibrations of the end mill 4 are prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support device for a rotary tool such as an end mill, which mainly receives a cutting resistance in a direction perpendicular to an axis.

[0002]

2. Description of the Related Art In the case of machining a concave portion of a mold using a rotary tool such as an end mill, if the concave portion of the processed portion is deep, a long end mill is used accordingly.

[0003]

By the way, a rotary tool such as an end mill that processes a workpiece with its tip is only held on the tail end side by a chuck at the tip of the spindle, so that the tool becomes long. The so-called chatter vibration may occur in the tool due to the cutting resistance received during the cutting process, and the machining efficiency and the quality of the machined surface may deteriorate.

In view of these problems, an object of the present invention is to provide a rotary tool support device for preventing chatter vibration of a rotary tool that receives cutting resistance in the direction perpendicular to the axis.

[0005]

In order to achieve the above object, the present invention is a rotary tool support device for supporting a rotary tool mounted on a spindle of a machining head, wherein the tip of the rotary tool is near a machining part. A support member independent of a spindle, having a support surface that is in sliding contact with a sliding surface having a circular cross section formed on an outer peripheral portion, and the support member can be swiveled around a rotation axis of the rotary tool with respect to a machining head. It is characterized by comprising a rotation supporting member for supporting.

[0006]

With this structure, the rotary tool is supported by the support member having the support surface that makes sliding contact with the sliding surface, vibration of the rotary tool is prevented, and deterioration of machining efficiency and machining quality is prevented. To be done. Also, by adjusting the rotation of the support member, the support member is prevented from interfering with the work. The shape of the support surface may be a ring shape that contacts the sliding surface over the entire circumference. However, in this shape, a part of the support member where the support surface is formed is always fed by the rotary tool. Since it exists on the front side in the direction, the part on the front side in the feed direction may interfere with the part on the workpiece before processing. Further, the work of replacing the rotary tool becomes complicated. Therefore, the range of contact between the support surface and the sliding surface is 180 degrees around the rotation axis of the rotary tool.
It is desirable to stay within the range below. With this configuration, the support member is positioned on the rear side in the feed direction of the rotary tool by the turning, so that the interference between the support member and the work on the front side in the feed direction is prevented. Further, by controlling the turning so that the support member is always positioned on the rear side of the tool feeding direction, it is possible to cope with a device such as a so-called NC machining device that automatically changes the feeding direction of the rotary tool.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, reference numeral 1 is a spindle rotatably supported by a processing head 2, and a chuck 3 at the tip of the spindle 1 holds a tail end portion of an end mill 4 as a rotary tool. There is. Therefore, it is possible to feed the end mill 4 by moving the processing head 2. A work W, which is a workpiece, is attached to the tip of the end mill 4.
A processing part 4a for processing the
A sliding surface 4b having a circular cross section is formed on the outer periphery in the vicinity of. An annular rotation support member 5 that surrounds the spindle 1 is installed on the processing head 2. The rotation support member 5
Supports a support member 6 having a support surface 6a that is in sliding contact with the sliding surface 4b, and can rotate independently of the spindle 1 about the rotation axis of the end mill 4 as a rotation center. Therefore, the end mill 4 can be rotated for cutting while the support surface 6a of the support member 6 is in sliding contact with the sliding surface 4b, and the end mill 4 is rotated substantially in the feeding direction backward while being applied to the end mill 4 during cutting. The chatter vibration of the end mill 4 can be prevented by receiving the cutting resistance in the direction perpendicular to the axis (hereinafter, referred to as the axis perpendicular direction) by the support member 6 via the contact portion between the sliding surface 4b and the support surface 6a. it can. Also, the rotation support member 5
Is rotatable, it is possible to perform cutting while rotating the support member 6 so that the arm portion 6b of the support member 6 does not interfere with the surrounding work W or the like.

When the support surface 6a is brought into contact with the entire circumference of the sliding surface 4b, the support member 6 receives cutting resistance in the direction perpendicular to the axis no matter which position the support member 6 is rotated. However, in the rotary tool support device of the embodiment, as shown in FIG.
The contact area with the sliding surface 4b of the contact angle is 180 degrees when the both ends of the contact portion are connected to the center of the rotary shaft of the end mill 4.
The angle is not more than ° (135 ° in the example), in other words, the central angle is not more than 180 ° about the rotation axis. In this way, when the support surface 6a is brought into contact with the half circumference of the sliding surface 4b, the rotary support member 5 is rotated to position the support member 6 on the rear side in the feeding direction of the end mill 4 when cutting is performed by the end mill 4. Thus, the support member 6 can be prevented from existing on the front side of the end mill 4 in the feeding direction, and the support member 6 can be prevented from interfering with the work W on the front side of the end mill 4 in the feeding direction.

Even when the support surface 6a is brought into contact with the half circumference of the sliding surface 4b, the cutting force applied to the end mill 4 by the support member 6 is swung while the support member 6 is swung so as not to interfere with the surrounding work W or the like. Can be received. That is, as compared with the case where the support surface 6a is in contact with the entire circumference of the sliding surface 4b, the support member 6
It only narrows the range in which the can be rotated. Further, if the contact portion of the sliding surface 4b with the support surface 6a is set to a half or less of the sliding surface 4b, the end mill 4 can be easily replaced.

Further, as shown, the support surface 6a
The tip of the support member 6 on which the arm 6b is formed.
With the detachable support piece 6c,
It is easy to replace the support surface. Particularly, in the case where the support member 6 is slidably attached to the rotation support member 5 in the radial direction as in this embodiment, the support member 6
Is moved in the radial direction, and a support surface 6a matching the diameter of the sliding surface of the end mill 4 held by the chuck 3 is supported.
The end mills 4 having different diameters can be mounted by mounting the support piece 6c having the.
Further, in the present embodiment, so-called cemented carbide is used as the material of the support surface 6a, but other cemented carbide materials may be used.

If the rotation position of the rotation support member 5 is controlled by using a drive means such as a servo motor as a control means, the work W is processed by feeding the end mill 4 along a preset path such as an NC milling machine. Even in such a case, it is possible to control so that the support member 6 is always positioned on the rear side in the feeding direction of the end mill 5. Also,
According to the rotary tool support device of this embodiment, it is possible to support rotary tools other than the end mill.

[0012]

As described above, according to the present invention, it is possible to prevent chatter vibration of the rotary tool by receiving the cutting resistance applied to the rotary tool in the direction perpendicular to the axis by the support device.

[Brief description of drawings]

FIG. 1 is a side view showing a rotary tool support device according to an embodiment.

FIG. 2 is a cross-sectional view showing a II-II cross section of FIG.

[Explanation of symbols]

 1 spindle 2 processing head 3 chuck 4 end mill (rotary tool) 5 rotation support member 6 support member

Claims (3)

[Claims] 1. A rotary tool support device for supporting a rotary tool attached to a spindle of a machining head, which slides on a sliding surface having a circular cross section formed on an outer peripheral portion of a tip of the rotary tool near a machining portion. A rotary tool support device comprising a support member independent of a spindle and having a supporting surface to be in contact with the rotary head, and a rotary support member supporting the support member so as to be rotatable around a rotation axis of the rotary tool with respect to a machining head. 2. The rotary tool according to claim 1, wherein a sliding contact range of the support surface with the sliding surface has a central angle of 180 ° or less with respect to the rotation axis. Support device. 3. The control means for rotating the support member so that the support member is located on the rear side in the feed direction of the rotary tool with respect to the rotation axis of the rotary tool. The rotary tool support device according to any one of 1.