JPH06170617A - Turret head unit - Google Patents

Abstract

PURPOSE:To provide a small-sized simple structure turret head in a cylinder device for engaging and disengaging a surface gear joint to fix the indexing position of a turret head provided with a rotating tool shaft in radial direction and a transmission means for transmitting rotational force to a rotating tool shaft. CONSTITUTION:As a cylinder device which makes unclamping of a clamp of a turret head 3, a cylinder device in which a ring-shaped piston 26 of single-acting type with pressure receiving surface on one side only, multiple rods 34 which are erected in axial direction of the piston at equal circular intervals on the pressure receiving side of the ring-shaped piston 26 and passes slidably through a partition wall 30 of a cylinder casing 24, and multiple single-acting small diameter pistons 33 located at the top of the rod are provided is adopted. A fluid pressure chamber 29 on the clamp side of the cylinder device is formed on the side opposite to the turret head side of the ring-shaped piston 26, and a fluid pressure chamber 42 on the unclamp side is formed on the partition wall 30 side of the small diameter piston 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turret head unit having a rotary tool shaft in a radial direction, and more particularly to a cylinder device for engaging and disengaging a surface gear coupling for fixing the indexing position of a turret head and a rotary tool shaft. The present invention relates to a turret head unit, which is characterized by the means for transmitting the rotational force.

[0002]

2. Description of the Related Art Turret heads equipped with a rotary tool shaft are
A hollow swivel shaft pivotally supports the base, and the rotational force is transmitted to the rotary tool shaft through a hollow hole of the swivel shaft. In a normal turret head unit, the transmission of the rotational force to the rotary tool shaft is performed via the tool drive shaft that passes through the axis of the turning shaft, and the rotary tool shaft is arranged in the radial direction of the turret head. A tool driving shaft passing through the center of the turning shaft and a rotary tool shaft are drivingly connected via a bevel gear.

On the other hand, in order to fix the indexing position of the turret head, it is general to fix the turret head to the base by means of a surface gear coupling (curvic coupling). When the turret head is not desired to move in the axial direction, A three-piece type surface gear coupling having fixed teeth fixed to the base, swivel teeth fixed to the turret head, and movable teeth that move in the axial direction of the swivel shaft to perform clamp unclamping is used.

When the turret head unit of a drilling center is not desired to have a large size in the direction of the turning axis of the base, a cylinder device including a piston for advancing and retracting the moving teeth of the surface gear coupling is a turret head. Is arranged on the outer peripheral portion of the turning axis of the. That is, in this case, the tool drive shaft of the rotary tool shaft, the hollow turning shaft of the turret head, and the cylinder device for clamping and unclamping the turret head are arranged concentrically from the inside of the turning center of the turret head. Since the piston of the cylinder device needs to be mounted so as not to rotate about the turning axis, it is difficult to directly fit the piston to the outer circumference of the turning axis of the turret head, and therefore the piston of the turret head is not provided. It is necessary to interpose a cylindrical immovable member (base member) extending from the base between the rotary shaft and the piston of the cylinder device. Further, since the piston of this cylinder device must be reciprocally driven, a structure in which a working fluid chamber is formed on both sides of the piston or a double flange type piston is used has been adopted.

[0005]

A plurality of tool shafts are mounted on the turret head, but it is important for work safety to be able to drive only one tool shaft that is actually used for machining. is there. Structures that achieve this include a structure in which all tool shafts are connected to the tool drive shaft and a clutch is mounted on each tool shaft, and an intermediate shaft that is oriented in a certain direction is provided in the center of the turret head. There is a structure in which only the tool shaft indexed to is engaged with this intermediate shaft and driven. The applicant of the present application has proposed the latter structure in Japanese Patent Application No. 4-72364. Although this latter structure can simplify the internal structure of the turret head, the tip of the turret head is extended to the central portion of the turret head through the base member inside the turning axis of the turret head, and the extended base member allows the turret head The structure is such that the intermediate shaft is supported at the center.

The structure generally used in the past for transmitting the rotational force for driving the tool to the tool shaft through the tool drive shaft and the bevel gear passing through the center of rotation of the turret head has a bevel gear at the center of the turret head. It is necessary to secure a space for accommodating the bevel gear, but especially when adopting the structure in which the intermediate shaft is pivotally supported at the center of the turret head as described above, the intermediate shaft becomes long because it is necessary to secure a mounting space for the bevel gear. However, this may have been an obstacle in reducing the size of the turret head.

In a turret head unit of a drilling center, etc., the tool driving shaft on the base side and the intermediate shaft in the above structure are arranged in parallel, so if the two can be connected by a belt transmission, the structure is very simple. In addition, the turret head can be downsized. However, in order to connect the tool drive shaft and the intermediate shaft with the belt transmission, a considerably large space for arranging the belt transmission inside the turning shaft of the turret head is required. When the cylinder device having the conventional structure as described above is adopted as the cylinder device for performing the above, it is impossible to secure a large space inside the turning shaft.

The present invention solves the above-mentioned complicated problems in the related art and obtains a new technical means capable of downsizing a turret head unit having a rotary tool shaft and simplifying its structure. Was made as an issue.

[0009]

In the turret head unit of the present invention, as a cylinder device for clamping and unclamping the turret head 3, one single-acting ring-shaped piston 26 having a pressure receiving surface on only one side, A plurality of rods 34 which are erected in the axial direction of the piston on the pressure receiving surface side of the ring-shaped piston 26 in the axial direction of the piston and slidably penetrate the partition wall 30 of the cylinder casing 24, and the tips of the rods 34. A plurality of single-acting small-diameter pistons 33
A cylinder device equipped with and is used. The fluid pressure chamber 29 on the clamp side of the cylinder device is the ring-shaped piston 2
6 is formed between the pressure receiving surface on the side opposite to the turret head and the partition wall 30 slidably supporting the rod 34, and the fluid pressure chamber 42 on the unclamp side is provided at the tip of the partition wall 30 and the rod 34. It is formed between the small diameter piston 33 provided.

In the above structure, the intermediate shaft 12 is provided at the center of the turret head 3, and this intermediate shaft is used as the tool drive shaft 2 on the base side.
Is particularly suitable for a turret head having a structure in which a tool shaft that is axially supported by a base member 6 in parallel with and is rotated on an extension axis of the intermediate shaft is driven by engaging with the intermediate shaft 12,
A sufficient space can be secured inside the turning shaft 17 of the turret head 3 for accommodating the belt transmission 15 that connects the tool driving shaft 2 and the intermediate shaft 12.

[0011]

The turret head unit of the present invention having the cylinder device having the ring-shaped piston 26 and the small-diameter piston 33 having the above-described structure has the moving teeth of the surface gear joint on the surface of the ring-shaped piston 26 facing the turret head. Put on,
The entire surface on the opposite side can be used as a pressure receiving surface for applying a clamping force to the surface gear coupling, and thus the radial dimension of the ring-shaped piston 26 can be reduced. In other words, the inner diameter of the clamp ring-shaped piston 26 can be increased when the outer diameter of the turret head is constant.

On the other hand, since the unclamping of the indexing position of the turret head 3 can be performed with a small force, the surfaces of the plurality of small diameter pistons 33 connected to the back surface of the ring-shaped piston 26 via the rods 34 on the rod 34 side. It is possible to unclamp the turret head by applying a fluid pressure to. Since the rod 34 of the small diameter piston 33 penetrates the cylinder casing 24,
By using the packing 36 that allows the rod 34 to prevent the ring-shaped piston 26, that is, the moving tooth 27 of the surface gear joint from rotating, and allows both rotation and axial movement on the inner diameter side of the ring-shaped piston 26. The ring-shaped piston 26 can be directly fitted and provided on the outer periphery of the turning shaft 17 of the turret head. That is, it is not necessary to interpose a cylindrical base member between the ring-shaped piston 26 and the swivel shaft 17, and the space on the inner peripheral side of the swivel shaft 17 can be increased correspondingly.

If a large space can be secured on the inner diameter side of the turning shaft 17 in this way, the intermediate shaft 12 provided at the center of the turret head 3 and the tool driving shaft 2 on the base side.
It is possible to adopt a structure in which and are connected using the belt transmission device 15, and it is possible to downsize and simplify the tool shaft drive mechanism of the turret head unit.

[0014]

EXAMPLE An example shown in the drawings will be described below. The figure shows an embodiment in which the structure of the present invention is adopted as a turret head unit of a drilling center,
A tool drive shaft 2 is vertically supported by the base 1, the lower end of which is located at the center of the turning shaft of the turret head 3, and a pulley 4 is fixed to this shaft end. A cylindrical base member 6 extends from the base 1 toward the center of the turret head 3, and a ring-shaped guide ring 7 is fixed to the tip thereof. The guide ring 7 has a groove 8 in the circumferential direction on the outer peripheral surface, and a ridge 1 in the direction perpendicular to the axis provided on the inner ends of a plurality of tool shafts axially attached to the turret head 3.
By fitting 0 into the circumferential groove 8, rotation of the tool shaft 9 is prevented. The guide ring 7 has a notch at the lower end, and the protrusion 10a of the tool shaft 9a indexed at the lower end of the turret head 3 has a circumferential groove 8 of the guide ring 7.
And is fitted into a groove 13 formed in the lower end of the intermediate shaft 12 in the direction perpendicular to the shaft.

At a portion inside the guide ring 7 at the tip of the cylindrical base member 6, a side face U-shaped bearing frame 11 is provided.
Is fixed, and a vertical intermediate shaft 12 is axially supported by the bearing frame 11, and a pulley 14 is fixed to a portion of the intermediate shaft 12 at the center of the turning shaft of the turret head 3. The pulley 14 and the pulley 4 of the tool driving shaft are rotatably connected by a timing belt 15. The timing belt 15 is provided so as to pass through the hollow hole of the cylindrical base member 6.

In the turret head 3, a turning shaft 17 integrally fixed to the back surface (base side) of the turret head 3 is mounted on the cylindrical portion of the base member 6 by bearings 18 and 19.
It is pivotally supported in a freely rotating state. A flange 20 is formed at an end of the swivel shaft 17 on the turret head 3 side and extends close to the outer diameter of the turret head 3. A flange of a surface gear coupling for clamping the indexing position of the turret head is formed on the inner diameter side of the back surface of the flange 20. The swivel teeth 21 are fixed, and a ring-shaped gear 22 is fixed on the outer diameter side. The ring-shaped gear 22 engages with a pinion, which will be described later, so as to perform indexing.
To rotate.

A fixed tooth 23 is fixedly provided to a cylinder casing 24 which is substantially integrated with the base 1 on the outer peripheral side of the swivel tooth 21 of the above surface gear coupling, and a cylinder formed inside the cylinder casing 24. A ring-shaped piston 26 is fitted between the shaft 25 and the outer circumference of the turning shaft 17 of the turret head. On the surface of the ring-shaped piston 26 on the turret head side, fixed is a moving tooth 27 having a width capable of simultaneously meshing with the fixed tooth 23 and the swivel tooth 21, and the surface 28 on the opposite side of the ring-shaped piston 26 is a moving tooth 27. Is a pressure receiving surface that receives fluid pressure when pressing the fixed tooth 23 and the swivel tooth 21. Fluid pressure chamber 2 of ring-shaped piston 26
9 is a ring-shaped piston 26 and a cylinder casing 24.
There are four rod holes 31 which are formed between the partition 30 and the partition 30 and which penetrate the partition 30 in the axial direction of the ring piston 26 at positions equally dividing the circumference of the ring piston 26. A shallow cylinder hole 32 is formed on the back surface of the partition wall 30 (the surface on the base side) so that the shaft center is aligned with each rod hole 31 and the head end side is open. The small-diameter piston 33 fitted in the cylinder hole 32 is formed. The rod 34 passes through the rod hole 31 and the pressure receiving surface 28 of the ring-shaped piston 26.
It is connected and integrated with. An O-ring 35 used for a normal piston is mounted as a liquid sealing material on the outer diameters of the small-diameter piston 33 and the ring-shaped piston 26, and the inner diameter of the ring-shaped piston 26 slides on the revolving shaft 17. A packing 36 that allows both rotation and sliding in the axial direction is attached to the outer peripheral surface.

A turret head drive shaft 38 is supported on the base 1 in parallel with the tool drive shaft 2, and a bevel gear provided at the lower end of the turret head drive shaft is provided on the side surface of the cylinder casing 24 as a turning shaft. A pinion 41 provided at the tip of the pinion shaft 39 meshes with a bevel gear 40 provided at the base end of a pinion shaft 39 that is axially mounted in parallel with the pinion shaft 39, and is provided on the outer periphery of the collar 20 of the turning shaft of the turret head. It meshes with the provided gear 22.

In the construction of the apparatus of the above embodiment, when the turret head 3 is indexed, four small diameter pistons 33 are used.
Fluid pressure is supplied to the fluid pressure chamber 42 formed on the turret head side, and the ring-shaped piston 26 is pulled by the rod 34 to move the moving tooth 27 of the surface gear coupling to the left in FIG. And it is disengaged from the swivel tooth 21. In this state, the turret head 3 can freely rotate. Therefore, the turret head drive shaft 38 is swung by an indexing motor (not shown), and the swivel shaft 17 is swung via the bevel gear 40, the pinion 41 and the gear 22. Turret head 3 for fixed quantity
To turn. When the turret head 3 is indexed to a new turning position, the fluid pressure is supplied to the fluid pressure chamber 29 formed on the side opposite to the turret head of the ring-shaped piston 26, and the ring-shaped piston 26 is moved to the right in FIG. The fixed tooth 2 is formed by engaging the moving tooth 27 of the surface gear joint with the fixed tooth 23 and the swivel tooth 21.
The turret head 3 is fixed by accurately determining the position of the rotary shaft 17 with reference to 3.

When indexing the turret head 3,
By controlling a tool driving motor (not shown) so as to always stop at a fixed position, the intermediate shaft 12 is stopped in a phase in which the groove 13 at the lower end thereof is oriented in the direction perpendicular to the paper surface of FIG. When the head 3 rotates, the protrusion 9 at the inner end of each tool shaft moves in the circumferential groove 8 of the non-rotating guide ring 7 while sliding in the circumferential direction, and a certain tool shaft 9a
Is indexed to the lowermost end, the protrusion 10 at the inner end of the tool shaft is disengaged from the circumferential groove 8 of the guide ring 7 and fits into the groove 13 at the lower end of the intermediate shaft 12. Therefore, among the tool shafts radially provided on the turret head 3, only the tool shafts indexed at the lower end engage with the intermediate shaft 12, and the protrusion 10 at the inner end of the other tool shaft is attached to the guide ring 7. Since they are engaged, when the tool drive shaft 2 is rotated, only the tool shaft indexed to the lowermost end rotates, and the other tool shafts hold the stopped state.

[0021]

According to the structure of the present invention described above,
It becomes possible to secure a wide space in the center of the turret head's turning axis. For example, in the turret head unit in which the center axis of the turret head is provided with an intermediate shaft that engages only with the tool shaft indexed to the machining position, It is possible to adopt a structure in which the tool drive shaft on the side and the intermediate shaft are rotationally connected by a belt transmission device, and it is possible to greatly simplify the tool shaft drive mechanism of the turret head such as a drilling center. Further, there is an effect that the entire turret head unit can be downsized.

[Brief description of drawings]

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

2 is a cross-sectional plan view of the device of FIG.

[Explanation of symbols]

 2 Tool drive shaft 3 Turret head 6 Base member 12 Intermediate shaft 15 Timing belt 17 Swivel shaft 24 Cylinder casing 26 Piston 27 Moving tooth 28 Pressure receiving surface 29 Fluid pressure chamber 33 Small diameter piston 34 Rod 42 Fluid pressure chamber

Claims (1)

[Claims] 1. A turret head unit provided with a rotary tool shaft in a radial direction, wherein a cylinder device for clamping and unclamping a turret head (3) is a single-acting ring-shaped one having a pressure receiving surface on only one side. The piston (26) and the cylinder casing (24) are planted in the piston axial direction at positions at equal intervals on the pressure receiving surface side of the ring-shaped piston (26).
Rods (34) slidably passing through the bulkhead (30) of the
And a plurality of single-acting small-diameter pistons (33) provided at the tip of the rod, the fluid pressure chamber (29) on the clamp side of the cylinder device is located on the side opposite to the turret head of the ring-shaped piston (26). A fluid pressure chamber (42) on the unclamp side is formed between the pressure receiving surface and the partition wall (30), and between the partition wall (30) and a small diameter piston (33) provided at the tip of the rod (34). A turret head unit characterized by being formed.