JPH0617815U - Machine tool machining head - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to improvement of a machining head used when milling, for example, in a machining center. In a machining head of a machine tool in which a machining head 6 for milling is mounted on a horizontal machine tool having parallel spindle axes, a tapered shaft 13 to be inserted on the spindle side and a driven shaft 14 are jointed to each other by a joint 21. In addition to connecting the driven shaft 14 and the joint 21 by spline fitting, relative movement in the axial direction is enabled and thermal deformation is prevented. Further, the tool head 17 attached to the tip of the driven shaft 14 can be changed in phase by 90 degrees around the horizontal axis to enable processing of horizontal and vertical surfaces.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a machining head used when milling a machining center or the like.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, there is known a device in which a machining head for milling is mounted on a horizontal machining center having a horizontal spindle axis and a horizontal plane of a workpiece is milled through a gear mechanism. For example, in the case of Japanese Utility Model Publication No. 62-5877, such a device is used, and the tool head provided at the tip of the machining head main body can be set at a predetermined angle, and in particular, the machining of the corner of the inner surface of the work is facilitated. It is a thing.

[0003]

[Problems to be solved by the device]

 However, in a horizontal machining center, the machining head is more likely to fall than in a vertical machining center with a vertical spindle axis. It was necessary to pay particular attention to maintaining the horizontal posture of the robot. The tilting of the machining head is caused not only by incorrect mounting on the machining center, but also by thermal deformation that occurs during machining, and it is important to prevent this thermal deformation. Was needed to improve. In addition, when the milling head is mounted on a horizontal machining center, the working surface is usually limited to the horizontal upper surface, so that there is a problem that the applicable range is narrow.

[0004]

[Means for Solving the Problems]

 In order to solve such a problem, the present invention comprises a taper shaft engageable with a spindle, a body containing a driven shaft parallel to the spindle shaft, and a tool head containing a cutter mounting shaft orthogonal to the spindle shaft. In a machining head of a machine tool, wherein the tapered shaft and the driven shaft are connected via a joint, and the driven shaft and the cutter mounting shaft are connected by a pair of bevel gears, the joint between the joint and the driven shaft is connected. In addition, the joint with the taper shaft allows it to move in the axial direction, and the tool head can be attached to the body so that its position can be changed.

[0005]

[Action]

 By connecting the taper shaft to which the rotation of the spindle is transmitted and the driven shaft through a joint and allowing the joint to move axially at the joint with the taper shaft or the joint with the driven shaft, The shaft elongation due to the influence can be absorbed and thermal deformation can be prevented. Also, by allowing the tool head at the tip of the machining head to be attached to the body so that it can be repositioned around a horizontal axis, for example, machining can be performed even if the machining surface is not horizontal, and the range of applications for milling is expanded. .

[0006]

【Example】

 Before describing the machining head of the machine tool of the present invention, a general view of the machine tool will be described. FIG. 4 is a side view of the entire machine tool, and FIG. 5 is a plan view of the same.

The machining head of the machine tool of the present invention is applied to a horizontal machine tool 1 having a horizontal spindle shaft as shown in FIGS. 4 and 5, and the machine tool 1 rises from a bed 2. A column 3 and a spindle head 4 which can move up and down along the column 3 are provided, and a spindle motor 5 shown by a broken line in FIG. 5 is connected to the spindle head 4.

The spindle head 4 is provided with two machining head mounting portions, and in this embodiment, the milling head 6 of the present invention and another type of machining head 7 are mounted. The two machining heads 6 and 7 can be selectively indexed to the machining position by the operation of the indexing motor 8. Incidentally, the machining position is a position where the machining head is parallel to the motor axis of the spindle motor 5 (the position of the machining head 7 in the figure).

Further, the bed 2 is provided with a pair of table feed motors 10 and 11 for moving the table in the directions of two orthogonal horizontal axes, and the upper part of the column 3 is provided with a spindle head. A vertical movement motor 12 is provided for feeding 4 up and down.

The details of the milling head 6 will be described with reference to FIGS. 1 to 3. 1 is a cross-sectional view of the processing head, FIG. 2 is a front view from the view A of FIG. 1, and FIG. 3 is a partially enlarged view of FIG.

As shown in FIG. 1, the milling machining head 6 includes a taper shaft 13 that can be inserted into a taper hole provided in the machining head mounting portion of the spindle head 4, and a body 15 in which a driven shaft 14 is housed. A tool head 17 having a cutter mounting shaft 16 incorporated therein is provided, and a bolt 20 can be fixed to a fixed position of the spindle head 4 via a ring-shaped shim 18. The rotation of the spindle motor 5 is transmitted to the taper hole of the machining head mounting portion of the spindle head 4.

The thickness of the shim 18 varies slightly along the circumferential direction. For example, when the thicker direction is set to the lower side, the machining head 6 may be mounted in an upwardly inclined posture, and When set to, it can be installed in a downward position.

By the way, a small-diameter connecting portion 13a is provided on the tip end side of the taper shaft 13, and a connecting portion 14a is also provided on the base end side of the driven shaft 14, and both connecting portions 13, 14a are provided. The joint 21 is engaged and connected.

As shown in FIG. 3, the joint 21 is, for example, of a type in which a spacer 21c is provided between a pair of hubs 21a with a flexible element 21b interposed therebetween. 21a is fixed to the connecting portion 13a with a bolt 22, and the hub 21a on the driven shaft 14 side is spline-fitted to the connecting portion 14a.

That is, as shown in FIG. 3, a spline m is provided on the shaft outer circumference of the coupling portion 14a of the driven shaft 14, and a spline hole n is also provided on the hub 21a side to fit the hub 21a. Is movable along the axial direction by the clearance t in the figure.

Therefore, for example, even if the driven shaft 14 expands and contracts in the axial direction due to heat, the influence thereof can be absorbed, and tilting due to thermal deformation does not occur. It should be noted that the axial floating mechanism may be provided on the taper shaft 13 side.

The driven shaft 14 is bearing-supported by an inner cylinder 23 fixed inside the body 15.

That is, a pair of bearings 24, 24 for supporting thrust load and radial load are provided inside the inner cylinder 23, and the bearing 24 is interposed between the inner race 24a and the outer race 24b. It is used by applying a preload to the conical roller 24c.

For this reason, the inner wall of the inner cylinder 23 is provided with a step portion d that comes into contact with the outer race 24b of each bearing 24, and the outer circumference of the driven shaft 14 includes the inner race 24a of each bearing 24. An inner spacer 25 is provided to regulate the inner position.

That is, as shown in FIG. 3, for example, an outer spacer 26 is provided outside the right bearing 24, is in contact with the outer side of the inner race 24a, and is further tightened to the outside by a tightening member 27. The inner race 24a is pushed inward by tightening.

This pressing can be increased until the inner side of the inner race 24a contacts the inner spacer 25. Therefore, by adjusting the length of the inner spacer 25, the preload that can be applied to the conical roller 24c is adjusted. You can do it.

Further, projecting portions 25a are provided at both ends of the inner spacer 25, the labyrinth e provided on the outer end surface of the inner spacer 25 is brought into contact with the inner wall of the inner cylinder 23, and the labyrinth e is provided on the outer end surface of the outer spacer 26. It is in contact with the inner wall of the inner cylinder 23.

Therefore, it is possible to prevent dust and the like from entering the bearing 24 from the outside, and also prevent grease and the like of the bearing 24 from leaking to the outside.

A flange portion 23a is provided on the outer peripheral portion of the inner cylinder 23, and an annular cover member 30 attached to the flange portion 23a via a shim 28 is integrated with the body 15.

A bevel gear 31 having a cone angle of 45 degrees as shown in FIG. 1 is attached to the tip of the driven shaft 14 penetrating the bearing 24 on the tip side, and protrudes outside the front surface of the body 15.

The tool head 17 described above is attachable to the body 15. In this attachment, the attachment angle can be changed every 90 degrees around the axis of the driven shaft 14, but the details will be described later.

The cutter mounting shaft 16 installed in the tool head 17 is orthogonal to the driven shaft 14, and is supported by a bearing 32 having a small diameter on the base end side and a bearing 33 having a large diameter on the other end side. ing. A bevel gear 34 having a conical angle of 45 degrees is attached to the intermediate portion and meshes with the bevel gear 31 of the driven shaft 14. The preload structure of the bearings 32 and 33 is similar to that of the bearing 24.

A milling cutter 35 is attachable to the tip of the tool head 17. That is, the milling cutter 35 is attached to the cutter mounting shaft 16 by the center bolt 42, rotates with the rotation of the cutter mounting shaft 16, and the workpiece is processed by the blade portion 36 at the tip outer peripheral portion.

Next, a procedure for mounting the tool head 17 will be described.

In the tool head 17, as shown in FIG. 2 taken along the line AA in FIG. 1, four mounting bolts 37 penetrate the bolt insertion holes of the tool head 17 and are screwed to the body 15 side. ing. The four mounting bolts 37 are provided at intervals of 90 degrees on the concentric circle of the center point P so that the phase of the mounting position can be changed by 90 degrees. The center point P is aligned with the extension line of the shaft center of the driven shaft 14.

Therefore, if the blade portion 36 is attached downward in the state shown in FIG. 2, the milling cutter 35 will be suitable for horizontal surface machining, and if the phase is shifted 90 degrees from now on and the blade portion 36 is oriented horizontally. It is compatible with vertical surface processing.

At this time, as shown in FIG. 1, a shim 38 is interposed between the cover member 30 and the shim 38 and the shim 28 between the flange 23 a and the cover member 30 causes the bevel gear 31, The backlash between 34 is eliminated. In other words, this is to protect the tooth portions of the bevel gears 31 and 34 that mesh with each other.

Further, in order to finely adjust the mounting angle of the tool head 17, a mounting angle adjusting mechanism 40 as shown in FIG. 2 is provided.

That is, the mounting angle adjusting mechanism 40 is for adjusting the angle within the range of a minute fitting gap generated between the mounting bolt 37 and the bolt insertion hole of the tool head 17, and from the tool head 17 side. A screw 41 is provided on each of the pair of projecting screw support portions 17a, and the tip of the screw 41 is brought into contact with the projecting portion 15a on the body 15 side. Then, the mounting angle is slightly changed by adjusting the pair of screws 41.

In the milling head 6 configured as described above, with the tapered shaft 13 inserted into and engaged with the tapered hole of the machining head mounting portion of the spindle head 4, the outer body 15 has a plurality of bolts. It is fixed to the fixed part of the spindle head 4 by 20. At this time, the posture of the machining head 6 can be finely adjusted by the direction of the shim 18, and the attachment of the tool head 17 can be finely adjusted by the attachment angle adjusting mechanism 40, as described above. Then, the blade portion 36 of the milling cutter 35 is made to coincide with a predetermined processing surface.

Next, the indexing motor 8 is operated as necessary to index the machining head 6 to the machining position, and then the spindle motor 5 is driven while feeding the table to start machining.

That is, the rotation of the spindle motor 5 is transmitted to the cutter mounting shaft 16 via the taper shaft 13, the joint 21, the driven shaft 14, and the bevel gears 31 and 34, and the milling cutter 35 rotates to perform processing.

Then, for example, heat generated in the machined portion during machining is transmitted from the cutter mounting shaft 16 to the driven shaft 14, the joint 21, and the taper shaft 13, but the connecting portion 14a of the driven shaft 14 and the joint 21 are spline-fitted. Therefore, the axial extension of the driven shaft 14 is absorbed in the same portion, and the falling due to thermal deformation does not occur. Therefore, the processing surface of the blade portion 36 of the milling cutter 35 does not change, and the working accuracy is not impaired.

As described above, since the mounting angle of the tool head 17 can change the phase by 90 degrees, the applicable range of processing is expanded.

[0040]

[Effect of device]

 As described above, in the machining head of the machine tool of the present invention, even if heat is transferred to the driven shaft and expansion and contraction occur, it can be absorbed by the joint part of the joint. Instead, the machined surface of the milling cutter can always be held in the specified orientation. That is, the processing accuracy is not reduced. In addition, since the mounting position of the tool head can be freely changed, it is possible to process vertical surfaces or horizontal lower surfaces, which was previously applicable only to processing horizontal upper surfaces. This has the effect of expanding the area.

[Brief description of drawings]

FIG. 1 is a sectional view of a processing head

FIG. 2 is a front view from the view A in FIG.

FIG. 3 is a partially enlarged view of FIG.

[Figure 4] Side view of the entire machine tool

FIG. 5 is a plan view of the same.

[Explanation of symbols]

 1 Machine Tool 13 Tapered Shaft 14 Driven Shaft 15 Body 16 Cutter Mounting Shaft 17 Tool Head 21 Joint 31, 34 Bevel Gear m, n Spline

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tomora Miyagi 1-10-1 Shin-Sayama, Sayama City, Saitama Prefecture Honda Engineering Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A taper shaft engageable with a spindle, a body that houses a driven shaft parallel to the spindle shaft, and a tool head that houses a cutter mounting shaft that is orthogonal to the spindle shaft. In the machining head of the machine tool, which is configured to connect the shaft with a joint through a joint and to couple the driven shaft and the cutter mounting shaft with a pair of bevel gears, the joint between the joint with the driven shaft or the tapered shaft. A machining head for a machine tool, wherein the tool head is allowed to move axially and the tool head is attachable to a body so that the position of the tool head can be changed.