JPH05277885A - Rotary cutting tool - Google Patents

Abstract

PURPOSE:To move an exhaust piping system in accordance with the movement of a horizontal shaft by providing a moving part for the piping system which moves along an annular duct provided coaxially with a spindle as the horizontal head rotates relative to the spindle. CONSTITUTION:When a tool main body 20 rotates relative to a spindle, a moving part moves along an annular duct 110 provided coaxilly with the spindle. In addition, since a joining part has one end connected to a cover 36 and the other end joined with a moving member 122. it moves in accordance with the movement of the tool main body 20 around the spindle of a machining tool. Furthermore, since a notch 128 extending in the radially external direction is provided in the moving member 122, the tip of a discharge pipe 40 enters or leaves the moving member 122 via the notch 128 when a tool is installed or removed in the axial direction of the horizontal shaft head 106.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling tool used for a machine tool such as a machining center equipped with an automatic tool changer, and more particularly, it has excellent dischargeability of chips produced by cutting a work material. It relates to a rolling tool.

[0002]

2. Description of the Related Art FIGS. 7 to 9 are disclosed in JP-A-4-4670.
Fig. 7 shows a conventional rolling tool described in Japanese Patent Publication No.

The tool body 20 has a plurality of tips 21 ... An arbor 22 is attached to the base end side of the tool body 20 and is fixed by bolts 23. The tip 21 is fixed by a wedge member 25 inserted in the groove 24 of the tool body 20. The cutting edge 26 of each tip 21 is slightly projected from the outer periphery and the tip of the tool.

The tool body 20 of the arbor 22 is connected to a spindle 28 supported by a spindle head 27 of a machine tool. A taper shank 29 of the arbor 22 is inserted into the spindle 28 so that the pull stud 30 is a base end of the spindle. It is mounted on the main shaft 28 by being pulled to the side. The rotation of the main shaft 29 is performed by the key groove 31 formed on the arbor 22 and the key 32 on the main shaft 28 side.
It is adapted to be transmitted to the tool main body 20 via.

The arbor 22 is formed with a grip 33 which is engaged with a tool changing arm (not shown) of an automatic tool changing device provided on the machine tool. An inner ring of a radial bearing 34 is fixed by a nut 35 on the tool tip side of the grip 33. A cover 36 is attached to the outer ring side of the radial bearing 34. The base end of the cover 36 is fixed to a cap 37 provided on the outer ring of the radial bearing 34 by a bolt 38, so that the axial movement of the tool body 20 is restricted.

The tip of the cover 36 is provided at the cutting edge 26 of the tool.
It is set at a position that is escaping upward by a distance L1 that is slightly larger than the cutting depth with respect to the tip of the. Further, a gap of δ is provided between the cover 36 and the cutting edge 26 in order to avoid these interferences and to ensure the hermeticity capable of maintaining the suction force.

A chip storage chamber 39, which is an annular space, is defined between the cover 36 and the tool body 20. The chip storage chamber 39 is connected to an external suction means (not shown) by a discharge pipe 40 provided outside the cover 36. Reference numeral 41 is a V groove provided on the outer circumference of the discharge pipe 40, and reference numeral 42 is a partition wall separating the chip storage chamber 39 and the radial bearing 34.

A plate-shaped chip guide member 44 is provided at a position facing the rake face 43 of the chip 21.
The chip guide member 44 is attached to the mounting seat 45 of the tool body 20.
And is fixed with bolts 45, and its surface is substantially flush with the tip surface of the tool body 20. The outer peripheral side of the chip guide member 44 is shaped so as to substantially close the chip pocket 47 formed in the tool body 20. A gap t is formed between the rake face 43 of the chip 21 and the end face 48 of the chip guide member 44 to guide the chips into the chip storage chamber 39. A groove portion 49 extending from the end surface 48 toward the wall surface of the chip pocket 47 is formed on the back surface of the chip guide member 44.
Care is taken to prevent clogging of chips passing through the gap t and to discharge the chips into the chip pocket 47 without delay.

On the other hand, a plurality of blades 50 ... Are formed on the outer periphery of the tool body 20. In this embodiment, the blades 50 generate airflow so as to send the air on the tip side of the tool body 20 to the base side. It has become. These feathers 50
Is formed by cutting a part of the outer periphery of the tool body 20 by machining, and its shape is gradually inclined toward the rear side in the tool rotation direction from the tool tip side toward the base end side. It is set.

The base end side of the cover 36 is formed in an elliptical shape which bulges laterally of the tip end portion, and the elliptical projection 51 is formed.
A cover restraint mechanism 52 is provided in the. The cover restraint mechanism 52 includes a guide hole 53 formed in the protrusion 51 in parallel with the axis of the tool body 20, an engagement shaft 54 slidably inserted in the guide hole 53, and the engagement shaft. A coil spring 55 for urging 54 toward the base end side in the axial direction of the tool, and a stopper 56 extending inward in the radial direction of the tool from the engaging shaft 54 are generally configured.

Here, the engaging shaft 54 is engaged with a tip end portion of a key groove 57 formed in a longitudinal direction on a side surface of the engaging shaft 54. The key groove 57 projects into a guide hole 58 of a screw 58 screwed into the projecting portion 51. In addition, the rotation is prevented and the movement in the tool axis direction is limited within a certain range. Also, the engaging shaft 5
The tip of 4 is adapted to fit into the engagement hole 60 of the engagement block 59 attached to the spindle head 27 of the machine tool when the arbor 22 is attached to the spindle 28. Further, as shown in FIG.
Has an engaging groove 6 whose tip is formed on the outer edge of the arbor 22.
The tool is extended to a position directly below 1 so that it can be projected and retracted from the engagement groove 61 with the movement of the engagement shaft 54 in the axial direction when the tool is replaced, and the tool is rotated during cutting work. Care is taken not to interfere with.

Further, a stand 63 is installed on a table 62 which is the base of the machine tool body. A mounting seat 65 is provided on the upper part of the stand 63, while a bolt 68 is inserted into a T-shaped groove 67 at the bottom of a bolt hole 66 provided at the base end of the stand 63, and a nut 69 is tightened. It is fixed at a predetermined position on 62.

A coupling 70 is removably attached to the mounting seat 65 vertically (in a direction parallel to the axis of the main shaft). A cylindrical connecting portion 71 is provided on one end surface of the coupling 70, and the connecting portion 71 is connected to a discharge hose 72. Also coupling 7
A through hole 73 is formed inside 0, and the discharge pipe 40 of the cover 36 is inserted into the other end of the through hole 73.

A stepped hole 74 is formed in the upper portion of the coupling 70, and a rod 75 is inserted into the hole 74 and is biased by a spring 76 so as to project into the through hole 73. Further, a set screw 7 is provided in the opening above the hole 74.
7 is screwed in and holds the rod 75. Then, when the discharge pipe 40 is inserted into the coupling 70, the tip of the rod 75 is inserted into the V groove 41 on the outer periphery of the discharge pipe 40 so as to prevent it from coming off.
Reference numeral 78 is a seal that seals between the discharge pipe 40 and the coupling 70.

In the above-described rolling tool, the position of the spindle head 27 is controlled, the discharge pipe 40 is inserted into and coupled to the coupling 70 on the stand 63, and then the coupling pipe 70 is raised to move the coupling. 70 is separated from the stand 63, and the coupling 70 and the discharge hose 72 can follow the movement of the tool body 20 and the cover 36. After the work is completed, the spindle head 27 is similarly moved to place the coupling 70 on the stand 63 from above, and then the discharge pipe 40 is pulled out in the direction of the central axis thereof, so that the cover 36 is separated from the coupling 70. It

[0016]

However, the suction type cutting tool having the above construction is premised on the fact that the spindle head 27 moves in a plane parallel to the base 62, and therefore the multi-axis control tool is used. It cannot be directly applied to machining centers. For example, in a so-called 5-face machining type (5-axis control type) machining center in which the tip of the spindle head 27 has a new degree of freedom, a horizontal shaft head that rotates around the axis of the spindle head 27 is used. A tool main body 20 is attached to the tip of the horizontal shaft head about an axis perpendicular to the spindle head 27. That is, when the suction type cutting tool having the above-mentioned configuration is used in such a machining center, there is a problem that the discharge hose 72 which is a pipe of the chip discharge system cannot follow the movement of the horizontal axis head. Further, as the length of the discharge hose 72 is longer, less constraint is imposed on the movement and angle change of the tool body 20, but on the other hand, there is a problem that the slack increases the possibility of interfering with the movement of the tool body 20.

The present invention has been made in view of the above circumstances, and is applied to a multi-axis control, in particular, a machine tool having more freedom with respect to a spindle head so that a chip suction system can follow its movement. The object is to provide a tool that can be used.

[0018]

To achieve the above object, the present invention provides a horizontal shaft head which is supported by a main shaft of a machine tool and rotates about the axis of the main shaft, and a horizontal shaft head which is supported by the horizontal shaft head. A tool body that rotates about an axis that is perpendicular to the main axis, a cover that is rotatably attached to the tool body and that forms a closed space between the tool body and the work surface, and a cover within the cover Connecting means for connecting the closed space of the device to the chip storage portion, the connecting means moving in the circumferential direction of the annular duct and the annular duct having the same center around the main shaft. It comprises a movable portion provided so as to be possible and a discharge pipe connecting the movable portion and the cover to each other. The discharge pipe has an axis directed in a direction parallel to the main shaft and one end connected to the cover. And the other end moves Is detachably connected to the moving portion, the moving portion overlaps with a part of the discharge pipe in the axial direction at one end of the discharge pipe, and is substantially equal to the outer diameter of the discharge pipe toward the outside in the radial direction of the discharge pipe. The configuration is such that a notch formed in the width dimension is formed.

[0019]

According to the above construction, when the tool body rotates with respect to the main shaft, the moving portion moves along the annular duct provided coaxially with the main shaft. Also, since one end of the connecting portion is connected to the cover and the other end is connected to the moving portion,
This can be followed when the tool body is about to move around the spindle of the machine tool. Further, since the moving portion is provided with a notch directed outward in the radial direction, when the tool is attached or detached in the axial direction of the horizontal shaft head, the tip of the discharge pipe is inserted through the notch. It enters or leaves the moving member.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, the same parts as those of the conventional example are designated by the same reference numerals to simplify the description. First, a schematic configuration of a machine tool to which the tool of the present invention is applied will be described with reference to FIG.

Reference numeral 100 denotes a portal frame, and the portal frame 100 supports the moving head 102 so as to be movable. A main shaft (not shown) is rotatably provided inside a main shaft main body 104 supported by the moving head 102, and is attached to and detached from a lower end of the main shaft in a direction of an axis C1 with respect to the main shaft. Horizontal axis head 1 possible
06 is attached. A rolling tool 108 is attached to the tip of the horizontal shaft 106 as shown in FIG. The axis C2 of the horizontal shaft head 106 and the rolling tool 108 is oriented in a direction orthogonal to the axis C1 of the main spindle body 104.

The rolling tool 108 has substantially the same structure as the rolling tool described with reference to FIGS. 7 to 9. The difference lies in the discharge of the cover 36 connected to the coupling in the conventional example. The pipe 40 has an annular duct 110.
Is connected to the point. The duct 110 has an annular shape having a sufficiently larger inner diameter than the rolling tool 20 or the main spindle body 104, and is attached to the outer periphery of the main spindle body 104 via a connecting rod 112 so that the axis C1 is aligned.

The duct 110 is shown in FIG.
The cross-sectional structure is as shown in. Reference numeral 114 denotes a duct main body having a U-shaped cross section, and an annular bottom plate 116 having substantially the same planar shape as the duct main body 114 is provided on the bottom surface thereof as shown in FIG. A moving member 122 is provided below the bottom plate 116 so as to sandwich the flange portions 118 and 120 at the bottom of the duct body 114 between the bottom plate 116 and the bottom plate 116. That is, the moving member 122 has the flange portion 118,
The bolt 120 is fixed to the bottom plate 116 while being sandwiched between the bottom plate 116 and the bottom plate 116. And
By being supported by such a structure, the bottom plate 116 slides in the circumferential direction with respect to the duct body 114, and along with this movement, the moving member 122 can move in the circumferential direction. There is.

As shown in FIG. 3, the bottom plate 116 and the moving member 122 are provided with a through hole 126 whose axis C3 is parallel to the axis C1 of the duct body 114, and a part of the through hole 126 is provided. Is provided with a step, and the inner diameter of the portion below the step is made larger than the through hole 126 to form a large diameter portion 127. This large diameter part 12
7 is a notch 128 having a depth of L at the deepest portion.
The notch 128 is opened outward in the radial direction of the duct body 114. Further, the upper surface 130 of the notch 128 has a depth L gradually increasing outward.
The taper is provided so that

One end of a discharge pipe 40 connected to the cover 36 is inserted into the moving member 122. One end of the discharge pipe 40 is formed in a taper shape at the same angle as the upper surface 130, and a ring-shaped seal member 132 made of an elastic body such as hard rubber is attached to the tip thereof. The outer diameter of the discharge pipe 40 is substantially the same as the inner diameter of the large diameter portion 127, and the inner diameter of the discharge pipe 40 is slightly smaller than the inner diameter of the through hole 126.

Further, a discharge pipe 134 connected to a suction means (not shown) such as a dust collector is connected to the upper portion of the duct body 114.

In the rolling tool having the above construction, by rotating the tool body 20, the chips produced by the cutting blade 26 enter the exhaust pipe 40 together with the airflow generated by the blades 50. It is sent from the exhaust pipe 134 to the suction means (not shown) such as a dust collector via the inside of the duct body 114.

When the horizontal shaft head 106 rotates about the axis C1, the cover 36 covering the tool also rotates about C1, and the bottom plate 116 slides with respect to the duct main body 114 following this. By doing so, the discharge pipe 40 can move while maintaining the connection state with the duct 110.

Further, the tool 1 is attached to the horizontal axis head 106.
08 (covering the tool body 20 with a cover 36)
When the tool 108 is to be mounted in the direction of the axis C2, when the tool 108 is moved along the axis C2, the tip of the discharge pipe 40 moves from the opening of the notch 128 to the inside of the moving member 122. In this case, the seal member 13 at the tip of the discharge pipe 40
2 gradually moves inward in a state of being slightly elastically deformed by contacting the taper of the upper surface 130 of the notch 128, and is pushed to a position where the outer circumference of the discharge pipe 40 contacts the innermost part of the large diameter portion 127. Be done.

On the other hand, when the tool 108 is to be detached from the horizontal shaft head 106, the tool 108 is pulled out along the axis C2 to remove the cover 36 and the discharge pipe 40.
Also moves in the same direction, and along with this, the tip moves outward along the upper surface 130 in the radial direction of the duct 110 and is removed.

Further, in the case of the embodiment, since the tip of the discharge pipe 40 is inserted into the moving member 122 over the length L, for example, the horizontal shaft head 106 is centered on the main shaft 104 for changing the surface to be processed. Spindle 1 when trying to rotate
Even when it is moved in the axial direction of 04, the movement within the range of this L is allowed. Therefore, the discharge pipe 4
The length L at which the tip of 0 is inserted is set to a required length according to the moving distance of the horizontal axis head 106.

The technique of the present invention can be applied to various modifications of the tool body, the cover, the duct, etc. as long as the condition that the axis of the exhaust pipe is parallel to the main axis of the machine tool is satisfied. ..

[0033]

As is apparent from the above description, according to the present invention, the tool main body supported by the spindle of the machine tool and attached to the tip of the horizontal shaft head which rotates about the axis of the spindle is covered with the cover. At the same time, a discharge pipe connected to this cover is provided in parallel with the main shaft, and on the other hand, an annular duct is provided around the main shaft with the same axis as the main shaft, and is provided so as to be movable in the circumferential direction of the annular duct. Since the notched portion formed with a width dimension approximately equal to the outer diameter of the discharge pipe is formed in the moving portion that is directed outward in the radial direction of the discharge pipe, it is lateral to the main axis. When the shaft head rotates, the moving part can move along an annular duct provided coaxially with the main shaft, and the exhaust piping system can follow the movement of the horizontal shaft head. Since the moving portion is provided with a notch directed outward in the radial direction, when the tool is attached or detached in the axial direction of the horizontal shaft head, the tip of the discharge pipe is moved through the notch to move the member. Can be inserted into or removed from the moving member. Therefore, the discharge pipe and the annular duct can be attached and detached in association with the operation of attaching and detaching the tool body to the horizontal shaft head.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment.

FIG. 2 is a bottom view of the example.

3 is an enlarged cross-sectional view of a portion indicated by a chain line III in FIG.

4 is a view taken along the line iv-iv in FIG.

FIG. 5 is a perspective view of the main part of FIG. 1 as viewed from diagonally below.

FIG. 6 is an external view of a machine tool to which the rolling tool of the present invention is attached.

FIG. 7 is a vertical sectional view of a conventional example of a rolling tool.

FIG. 8 is a bottom view of a conventional example.

FIG. 9 is a front view of a tool body of a conventional example.

[Explanation of symbols]

20 Tool body 36 Cover 40
Discharge pipe 104 Main shaft body 106 Horizontal shaft head 10
8 Rolling tool 110 Duct 112 Connecting rod 11
4 duct body 116 bottom plate 122 moving member 12
6 Through hole 127 Large diameter part 128 Notch 13
0 upper surface

Claims (1)

[Claims] 1. A horizontal shaft head which is supported by a main shaft of a machine tool and rotates about an axis of the main shaft, and a tool body which is supported by the horizontal shaft head and rotates about an axis perpendicular to the main shaft. A cover that is rotatably attached to the tool body about its axis to form a closed space between the tool body and the work surface, and a connecting means that connects the closed space in the cover to the chip storage portion. The connecting means includes an annular duct that is provided around the main shaft with the same center, a moving portion that is movable in the circumferential direction of the annular duct, the moving portion and the cover. And a discharge pipe connecting the two with each other, the discharge pipe having an axis directed in a direction parallel to the main shaft, one end connected to the cover, and the other end detachably connected to the moving portion. , The moving part A notch part that is formed at one end of the discharge pipe in the axial direction so as to overlap in the axial direction thereof and has a width dimension that is substantially equal to the outer diameter of the discharge pipe toward the outside in the radial direction of the discharge pipe. Cutting tool.