JPH05237711A - Rotary tool holder - Google Patents

Abstract

PURPOSE:To provide a rotary tool holder used in working a workpiece tangentially with a lathe and driven by one station rotating system turret with high rigidity and small turning radius of a tool. CONSTITUTION:A rotary tool holder is composed of a first holder 11 journalling a transmitting shaft 14 provided on the proximal end with a coupling 8 and bevel gear 22 engaging a drive shaft 3 incorporated in a turret 1 and, a second holder 12 to journal an intermediate shaft 15 having on the proximal end a bevel gear 23 attached thereto to mesh with the bevel gear 22 and a tool shaft 16 connectively meshing with the distal end of the intermediate shaft at an acute angle. The first and second shafts 11, 12 are attached to a station adjacent to the turret 1 so that the bevel gears 22, 23 mesh with each other in the attachment of the shafts. When the first holder 11 is indexed to be directed to a workpiece 6, the proximal end of the transmitting shaft 14 is connected to an intermediate drive shaft 3 built in the turret 1 through the couplings 7, 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary tool holder mounted on a turret tool post of a lathe, and particularly to a tool used when chamfering a workpiece or grooving in a direction perpendicular to an axis with a milling cutter. It is about the holder.

[0002]

2. Description of the Related Art When chamfering a workpiece or grooving in a direction perpendicular to an axis on a lathe, the milling cutter 31 must be moved in the tangential direction of the workpiece 6 while rotating, as shown in FIG. Since the tool post of a normal lathe can move only in the Z-axis direction (main axis direction) and the X-axis direction (radial direction of the work), the rotary tool can be moved in the tangential direction of the work by moving the tool post in the X-axis direction. To do so, a special tool holder is needed.

On the other hand, as a rotary tool driving system for a turret lathe, there are an all-station rotary system and a one-station rotary system. The all-station rotation method has a structure in which all the tool axes of the rotary tool holder mounted on the turret mesh with the drive bevel gear that rotates around the turret rotation center axis. The tool is driven. Although this method simplifies the driving mechanism of the rotary tool, it has a drawback that power loss is large and all the tools protruding around the turret rotate, which is dangerous.

On the other hand, the one-station rotation system is a system in which only the rotary tool mounted on the station indexed in the direction of the work is driven, and the structure of the turret is slightly complicated, but there is little power loss and it is safe. It has the advantage of being available, and recently, the one-station rotation system is becoming more popular.

In such a turret lathe, as a tool holder for realizing tangential processing of a work, the structure shown in FIG. 2 is used for the all-station rotation system, and the structure shown in FIG. 3 is used for the one-station rotation system. Is used. In the structure of FIG. 2, when the tool shaft 16 is meshed with the tip of the intermediate shaft 15 extending in the radial direction of the turret 1 at an acute angle and the intermediate shaft 15 is indexed obliquely, the tool shaft 16 intersects the work 6 at a right angle. It is designed so as to face the direction.

On the other hand, in the structure shown in FIG. 3, the first intermediate shaft 25 indexed in the direction of the work 6 (in the case of the one-station rotary system, only the shaft in this direction is driven) is moved in the direction perpendicular to the second direction. The structure is such that the intermediate shaft 26 is meshed with the tool shaft 16 parallel to the second intermediate shaft 26.

In FIG. 3, reference numeral 3 denotes an intermediate drive shaft that is axially supported inside the turret so as to always face the radial direction of the work, and the intermediate drive shaft 3 is only the shaft indexed in the direction toward the work. Engage and drive only that shaft. 27,
28 is a bevel gear pair that connects the first intermediate shaft 25 and the second intermediate shaft 26, 29 and 30 are gear pairs that connect the second intermediate shaft 26 and the tool shaft 16, and 21 is a collet chuck that holds a rotary tool. ..

[0008]

In the structure of FIG. 3, since the second intermediate shaft 26 is interposed between the first intermediate shaft 25 and the tool shaft 16, the position of the collet chuck 21 becomes far from the center of the turret. The rigidity decreases, and the turning radius when the turret rotates increases, which greatly affects the dimensions of the entire machine. On the other hand, the structure of FIG. 2 requires only one intermediate shaft, and the position of the rotary tool can be brought close to the center of the turret, but there is a problem that it can be used only in the all-station rotary system.

SUMMARY OF THE INVENTION It is an object of the present invention to obtain a rotary tool holder for tangential machining in which a turret of a one-station rotary system has a high tool rigidity and a small turning radius of the tool as in the case of the all-station rotary turret. ..

[0010]

The rotary tool holder of the present invention is mounted using two adjacent stations of the turret 1. At the first station, which is indexed in the direction of the work 6, is mounted a transmission shaft 14 provided with a bevel gear 22 and a coupling 8 that engages with the drive shaft 3 mounted in the turret 1 at the base end. The holder 11 is attached. The transmission shaft 14 is provided at the base end of the second station adjacent to this.
Intermediate shaft 1 equipped with a bevel gear 23 that meshes with a bevel gear 22 of
5 and a second holder 12 including a tool shaft 16 meshed with the tip of the intermediate shaft at an acute angle. The first holder 11 and the second holder 12 are separately turrets 1
Are installed in the adjacent stations, and when they are installed, the bevel gears 22 and 23 at the base ends thereof are in mesh with each other.

[0011]

When the first holder 11 is indexed toward the workpiece 6, the base end of the transmission shaft 14 and the intermediate drive shaft 3 built in the turret 1 are linked by the couplings 7 and 8. When the intermediate drive shaft 3 is driven, the couplings 7, 8
The transmission shaft 14 is driven via the bevel gears 22 and 23, the intermediate shaft 15 of the second station extending obliquely above the work 6 is driven via the bevel gears 22 and 23, and the tool shaft is driven via the bevel gears 19 and 20 at the tip thereof. Driven.

In the structure of the present invention, the internal structure of the second holder 12 mounted on the second station diagonally located with respect to the work 6 is the same as that of the conventional tool holder for the all-station rotation system shown in FIG. They are approximately equal, so that the rotary tool can be placed closer to the center of the turret 1. Since the intermediate shaft 15 of the second holder is driven via the transmission shaft 14 of the first holder which is indexed in the direction toward the work 6, even if the turret of the one-station rotation system is used for the work. It is possible to drive the intermediate shaft 15 that is oriented obliquely.

Further, in the structure of the present invention, the tool holder 1
Although 1 and 12 occupy two stations, since the rotary tool and the tool holder project to the adjacent stations even in the conventional structure, the tools cannot be attached to the adjacent stations. This is not a drawback of the invention.

[0014]

EXAMPLE Next, the example shown in FIG. 1 will be described. A drive bevel gear 2 shown by a dotted line in the drawing is attached to the tip of a drive shaft (not shown) that penetrates the turning shaft of the turret 1. The intermediate drive shaft 3 is rotatably supported by a bearing 10 on a non-rotating frame 4 provided inside the turret 1, and a driven bevel gear 5 meshes with the drive bevel gear 2. Therefore, the intermediate drive shaft 3
Does not turn when the turret 1 turns, but always faces the workpiece 6. The tip of the intermediate drive shaft 3 is provided with a groove 7 in the direction perpendicular to the axis, and the intermediate drive shaft 3 always stops in a phase in which the groove 7 faces the tangential direction of the turret 1. When the tool holder mounted on the turret 1 is indexed in the direction toward the work 6, the ridge 8 provided at the base end of the shaft pivotally supported by the tool holder engages with the groove 7 and the intermediate drive shaft. The rotation of 3 is transmitted only to the shaft indexed to the machining position.

The tool holder according to the present invention comprises a first holder 11 and a second holder 12 which are mounted on two adjacent stations. The first holder 11 is the bearing 1
4, a radial transmission shaft 14 of the turret 1 is axially supported, and a ridge 8 similar to that provided on another rotary tool shaft is provided at the base end of this transmission shaft, and the first holder 11 When the ridge 8 is indexed to the machining position,
Engage with the groove 7.

In the second holder 12, an intermediate shaft 15 which is oriented in the radial direction of the turret and a tool shaft 16 which intersects the tip of the intermediate shaft 15 and is orthogonal to the transmission shaft 14 are respectively bearings 17 and 18. The intermediate shaft 15 and the tool shaft 16 are rotatably connected by bevel gears 19 and 20.
The collet chuck 21 is attached to the tip of 6. The transmission shaft 14 and the intermediate shaft 15 are rotatably connected by meshing bevel gears 22 and 23 attached to the base ends thereof. At the base end of the intermediate shaft 15, there is no protrusion 8 like that provided on the transmission shaft 14. Therefore, even if the intermediate shaft 15 is indexed in the direction toward the workpiece 6, the intermediate drive shaft 3 Is not connected to.

[0017]

According to the structure of the present invention as described above, the intermediate shaft which faces obliquely upward with respect to the work can be driven by the intermediate drive shaft which faces the direction of the work. It becomes possible to mount and drive a rotary tool holder for tangential processing having the same structure as that used in the conventional all-station rotation system.
Therefore, there is an advantage that the tool can be mounted with high rigidity without increasing the turning radius of the tool, and the low power loss and safety which are the characteristics of the one-station rotation method can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a first conventional example.

FIG. 3 is a sectional view of a second conventional example.

FIG. 4 is a perspective view showing the principle of tangential processing.

[Explanation of symbols]

 1 Turret 6 Work 11 First holder 12 Second holder 14 Transmission shaft 15 Intermediate shaft 16 Tool shaft 22 Bevel gear 23 Bevel gear

Claims (1)

[Claims] 1. A turret (1) comprises a first holder (11) and a second holder (12) mounted on two adjacent stations, and the first holder (11) has a turret 1 at its base end. A transmission shaft (14) provided with a coupling 8 that engages with the drive shaft 3 and a bevel gear (22) is mounted, and the second holder (12) has the bevel gear (22) at the base end. Intermediate shaft (1 with a bevel gear (23) that meshes
5) and the tip of this intermediate shaft and the tool shaft (1
6) is mounted axially, and the first holder (11) and the second holder (1
A rotary tool holder in which the bevel gears (22) and (23) at the base ends mesh with each other when the (2) is attached to the adjacent station of the turret.