JPH0319010B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a hob head device that enables automatic replacement of a hob and hob arbor assembly in a hobbing machine.

<Prior Art> A conventional hob mounting structure in a hobbing machine is shown in FIG.

On the hob head 01, a hob spindle 02 and an arbor support 03 are provided facing each other.
A hob assembly 09 formed by combining a hob 04 and a hob arbor 05 has tapered portions 0 at both ends of the hob arbor 05.
8 and 07 are the tapered hole 02a at the tip of the hob spindle 02 and the tapered hole 0 at the tip of the arbor support 03.
Arbor support 03 when fitted with 3a.
The draw bar 06 is passed through the through hole 05a at the center of the hob arbor 05, and the draw bar 06
By turning the bolt head 06a at the rear end, the threaded part 06b at the tip of the drawbar 06 is attached to the hob spindle 0.
It is attached by screwing into the female threaded part 02b in 2.

To replace the hob assembly 09 in this type of hobbing machine, the operator first turns the bolt head 06a of the drawbar 06 with a tool from the installed state shown in FIG. part 02b, and then pull the drawbar 06 from the arbor support 03 side to remove the hob arbor 05.
from the through hole 05a, then support the hob assembly 09 by hand, and in that state remove the hob assembly 09 from the arbor support 0.
3 to the left in the figure, and remove the hob assembly 09 by removing the tapered parts 07 and 08 at both ends from the arbor support 03 and the respective taper parts 03a and 02a of the hob spindle 02, and then install by reversing the procedure. It was on.

<Problems to be Solved by the Invention> As described above, when replacing the hob assembly 09 in a conventional hobbing machine, the operator must tighten and remove the drawbar 06, and in addition, the operator has to tighten and remove the drawbar 06. Since the assembly 09 must be supported by hand, it is a rather troublesome task. In particular, recently, the hob 04 has tended to be larger and heavier, and there are restrictions on where it can be installed, making it increasingly difficult to replace the hob assembly 09. On the other hand, as with machining sensors, there is a growing desire to introduce multi-model processing and unmanned operation to hobbing machines.

The present invention has been made in view of the above-mentioned circumstances, and provides a hob head device that enables automatic hob replacement in a hobbing machine, thereby facilitating and simplifying the hob replacement work and reducing the hob replacement time. The purpose is to shorten the time and make it more reliable, as well as to enable unmanned operation of the hobbing machine.

<Means for Solving the Problems> The structure of the present invention that achieves the above object is such that a hob is fitted on the outside of a hob arbor having a drawbar through hole in the center and tapered portions at both ends, and the hob is integrally formed. A hob head device that automatically attaches and detaches a hob assembly formed by connecting a hob to a hob spindle and an arbor support provided oppositely on the hob head, the hob head being driven and rotated and having a tapered hole at the tip. A drawbar having a threaded portion at the tip is incorporated into the hob spindle, and the drawbar is movable forward and backward relative to the arbor support, while the arbor support having a tapered hole at the tip can be moved toward and away from the hob spindle. The tip of the drawbar is movable, and the tip of the drawbar is penetrated into the through hole of the hob assembly, the tapered portions of both ends of which are supported by the tapered hole of the tip of the hob spindle and the tapered hole of the tip of the arbor support. It is characterized in that it is provided with a clamp member that is screwed into or separated from the threaded portion.

<Operation> The hob assembly in the hob head device is installed and removed in the following manner.

When installing the hob assembly, the arbor support is in a retracted position relative to the hob spindle.

The hob assembly is carried in between the hob spindle and the arbor support by a robot or the like, and
A tapered portion of the hob assembly on the hob spindle side is fitted into a tapered hole portion at the tip of the hob spindle.

Next, the arbor support moves forward and the tapered hole at the tip of the arbor support is fitted into the tapered part at the other end of the hob assembly. In other words, the tapered portions at both ends of the hob assembly are supported by the hob spindle and the arbor support.

The drawbar is then advanced through the hob arbor through hole in the hob assembly and the threaded end enters the arbor support. Additionally, the clamp member within the arbor support rotates and is screwed into the threaded portion of the incoming drawbar tip. When the clamp member is screwed in by a predetermined amount, the hob assembly receives a tightening force from the tapered portions at both ends, and is fixed to the hob spindle and the arbor support.

When removing the hob assembly, the hob assembly in the above-mentioned attached state is first grasped by a robot or the like.

Next, the clamp member is rotated and removed from the threaded portion at the tip of the drawbar.

The drawbar is then retracted and retracted into the hob spindle.

Next, the arbor support is retracted and the tapered hole at the tip is disengaged from the taper of the hob assembly.

Next, by moving the hob assembly toward the arbor support side by a robot or the like, the other tapered portion is also removed from the tapered hole at the tip of the hob spindle.

Thereafter, the hob assembly is taken out from between the hob spindle and the arbor support by a robot or the like.

<Example> Next, an example of a hobhead device according to the present invention will be described based on the drawings.

FIG. 2 shows a side view of a hobbing machine equipped with a hobbing head device according to one embodiment, and FIG. 3 shows a front view.

In the figure, reference numeral 51 denotes a hobbing machine bed, on which the main column 4 is integrally erected. A hob saddle is provided along the column 4 so as to be movable up and down, and the hob head device 1 is constructed on this hob saddle. 52 is the hobhead device 1
This is a hob assembly that is attached to and detached from the hob.

On the other hand, 5 is a counter column provided on the bed 51, and a work support 53 is provided to be movable up and down. A work table 54 is provided below the work support 53.

In addition, in the figure, 3 is an operation panel, and 7 is an electrical device.

A hob assembly 52 is shown in FIG. The hob assembly 52 is assembled by fitting the hob 2 onto the outer periphery of the hob arbor 10, which has tapered parts 11 and 12 at both ends and has a drawbar through hole 13 in the center thereof, and tightening a nut 55. The two are combined into one.

FIG. 5 shows a cross section of a hob head device 1 according to one embodiment along a plane on the hob spindle side.

The hob spindle 20 has a bearing 5 on the hob head 1a.
It is rotatably supported via 6. A driven gear 57 is mounted on the hob spindle 20, and the hob spindle 20 is rotated by transmitting rotational driving force to the driven gear 57 from a drive system (not shown) via the gear.

The hob spindle 20 has a cylindrical shape, and a tapered hole 20a for receiving the tapered part 11 of the hob assembly 52 is formed at the tip thereof.

A drawbar 15 is incorporated into the hob spindle 20 with its central axes aligned. A threaded portion 63 is formed at the tip of the drawbar 15 . A piston 21 is integrally attached to the rear part of the draw bar 15 and can slide on the inner circumferential surface of the hob spindle 20, and a spline 28 is formed on the outer circumference of the draw bar 15 on the front side of the piston 21. On the other hand, a spline collar 27 having a female spline 27a that can engage with the spline 28 is fixed to the front part of the hob spindle 20. The front side of the spline collar 27 is closed with a member 58.

An air passage 59 is formed in the center of the drawbar 15 to guide the retreating air.
At a position in front of the piston 21, the drawbar 15 is communicated with the outer peripheral side of the drawbar 15 through an air hole 25 formed in the radial direction of the drawbar 15. In other words, the front side of the piston 21 serves as an air pressure chamber 60 for retracting the drawbar. A connecting member 61 is integrally connected to the rear end of the hob spindle 20, and an air passage 24 is provided in the center of the connecting member 61 to guide air for retreat and connect with the air passage 59 of the drawbar 15. It is being Further, a forward air passage 23 is formed in the connecting member 61 and communicates with the rear surface side of the piston 21 . In other words, the rear side of the piston 21 serves as an air pressure chamber 62 for advancing the drawbar. The connecting member 61 has a rotary joint 2
An air pressure source is connected via 2.

Therefore, if air from the air pressure source is supplied to the air pressure chamber 62 through the forward air passage 23,
The drawbar 15 together with the piston 21 is advanced in the hob spindle 20, and at the forward end the spline 28 connects with the female spline 27 of the spline collar 27.
a, the drawbar 15 and the hob spindle 2
0 means that they are integral in the direction of rotation of the hob spindle 20. In this state, if air is supplied to the air pressure chamber 60 for retraction through the air passages 24, 59 and the air hole 25, the drawbar 1 together with the piston 21
5 is moved backward, and the rear end of the drawbar 15 is connected to the connecting member 6.
1 (the position shown in FIG. 5). The entire stroke of movement of the drawbar 15 back and forth is indicated by a in the figure. Drawbar 15
When has moved forward by the full stroke a, the threaded portion 63 at the tip of the drawbar 15 enters into the arbor support 6, as will be described later.

Note that, on the outside of the hob spindle 20, a detent pin 26 is provided on the hob head 1a toward the outer periphery of the hob spindle 20. The locking pin 26 moves forward and backward in the radial direction of the hob spindle 20, and when moving forward, it fits into a recess 64 formed on the outer circumferential surface of the hob spindle 20 to prevent the hob spindle 20 from rotating. I'm starting to do that. Hob spindle 20
is prevented from rotating only when the hob assembly 52 is replaced, and the rotation preventing pin 26 is moved back and is in a state where the rotation is released while the hob 2 is engaged in gear cutting. In order to detect whether the hob spindle 20 is stopped or released, the hob head 1a is provided with limit switches 36a and 36b. These limit switches 36
a and 36b are the dog 6 integrated with the locking pin 26;
5.

FIG. 6 shows a cross section of the hobhead device 1 taken along a plane on the arbor support 6 side. In addition,
Also on the arbor support 6 side, the hob spindle 2
The side facing 0 is the tip side (front end side), and the opposite side is the rear end side.

An arbor support body 6a constituting the outer shell of the arbor support 6 is mounted on the hob head 1a so as to be movable towards and away from the hob spindle 20. A piston rod 66 of a cylinder 30 provided on the hob head 1a is connected to the rear part of the arbor support body 6a. Therefore, as the piston rod 66 expands and contracts due to the operation of the cylinder 30, the arbor support body 6a moves toward and away from the hob spindle 20 described above.

A sleeve 68 is rotatably supported inside the arbor support body 6a via a bearing 67, and a hob assembly 5 is attached to the tip of the sleeve 68.
Tapered hole portion 6b for receiving taper portion 12 of No. 2
A tapered member 69 is integrally provided.

A clamp member 31 is rotatably incorporated inside the sleeve 68 via a bearing member 70. A female threaded portion 71 is formed on the inner periphery of the clamp member 31 and can be screwed into the threaded portion 63 at the tip of the drawbar 15 . Furthermore, a claw 72 is integrally provided at the rear of the clamp member 31.

Inside the arbor support body 6a, a clutch 33 is provided on the rear side of the sleeve 68 so as to be movable back and forth, and a claw 73 that engages with the claw 72 of the clamp member 31 is provided on the front surface of the clutch 33. A tightening hydraulic motor 32 is attached to the rear end of the arbor support body 6a, and the inner periphery of the clutch 33 is fitted onto a spline shaft 75 that is integrally connected to a rotating shaft 74 of the motor. That is, the clutch 33 is axially movable on the spline shaft 75 and can be rotated by the operation of the hydraulic motor 32. An air pressure chamber 76 is formed on the rear side of the clutch 33, and air for advancing the clutch 33 is supplied from a port 34 formed in the arbor support body 6a. Further, on the front side of the clutch 33, a clutch 33 is provided.
The spring force for pushing back 3 is applied by spring 77. Therefore, the clutch 33 moves forward as air is supplied to the air pressure chamber 76.
The claw 73 engages with the claw 72 of the clamp member 31, and when the air pressure is released, the claw 73 is moved backward by the spring force of the spring 77, and the claws 73 and 72 are disengaged. The arbor support main body 6a is provided with a limit switch 35, and a dog 78 integrated with the clutch 33 operates the limit switch 35 to detect the disengaged state of the claws 72 and 73.

Next, the operation of attaching and detaching the hob assembly 52 using the hob head device 1 having the above configuration will be explained.

Before installing the hob assembly 52, the drawbar 15 is retracted and housed in the hob spindle 20, as shown by the solid line in FIG. The hob spindle 20 is fitted into the recess 64 on the circumferential surface of the hob spindle 20, and the hob spindle 20 is prevented from rotating. On the other hand, the arbor support 6 is in a retracted state as partially indicated by the dashed double-dashed line in FIGS. 6 and 7.

The hob assembly 52 is carried between the hob spindle 20 and the arbor support 6 by a robot or the like, and is moved in the axial direction toward the hob spindle 20. First, the tapered part 11 of the hob assembly 52 is placed at the tip of the hob spindle 20. It is fitted into the tapered hole 20a.

Next, the arbor support 6 moves forward by a stroke b in FIG. 7 due to the operation of the cylinder 30, and the tapered hole portion 6b is fitted into the tapered portion 12 of the hob assembly 52. In this manner, when the hob assembly 52 is temporarily received, the robot or the like releases the hob assembly 52 and retreats.

Next, air is supplied to the forward air pressure chamber 62 at the rear of the piston 21 through the rotary joint 22, and the draw bar 15 moves forward together with the piston 21. The drawbar 15 passes through the through hole 13 of the hob arbor 10 of the hob assembly 52 and reaches the arbor support 6 side. On the other hand, on the arbor support 6 side, the clutch 33 moves forward due to the supply of air to the air pressure chamber 76, and its pawl 73 engages with the pawl 72 of the clamp member 31, and the clamp member 31 is moved by the operation of the hydraulic motor 32. be rotated.

When the threaded portion 63 at the tip of the drawbar 15 enters, the female threaded portion 7 of the rotating clamp member 31
1 is screwed into the threaded portion 63, and when it is screwed together by a predetermined amount as shown in FIG.
2 stops. In this state, the tapered parts 11 and 12 of the hob assembly 52 are tightened by the hob spindle 20 and the tapered holes 20a and 6b of the arbor support 6, and the hob assembly 52 is
0, it is fixed to the arbor support 6 and ready for gear cutting work. Note that the drawbar 15 moves forward to the full stroke a, and the spline 28 on the rear side matches the spline 27a on the hob spindle 20 side.
and becomes integral with the hob spindle 20 in the rotational direction.

Thereafter, the locking pin 26 is retracted and the hob spindle 20 is ready to rotate. This condition is detected by actuating limit switch 36a.

Even when the hob assembly 52 is removed, the hob spindle 20 is prevented from rotating by the rotation stopper pin 26 as described above.

A robot or the like moves forward with respect to the hob assembly 52 which is in a stopped state and is held by the hob assembly 52.

By operating the hydraulic motor 32 in the opposite direction, the clamp member 31 is rotated in the opposite direction, and air is supplied to the air pressure chamber 60 for retraction within the hob spindle 20, and the threaded portion 63 at the tip of the drawbar 15 is rotated in the opposite direction. It is separated from the female threaded portion 71. Note that the force required to tighten the clamp member 31 to the threaded portion 63 of the drawbar 15 and the force required to loosen it are different;
can be adjusted by adjusting the pressure applied to the

The drawbar 15 is retracted a full stroke a until it is completely removed from the through hole 13 of the hob assembly 52 and is seated within the hob spindle 20 as shown in FIG.

Thereafter, the arbor support 6 is moved backward (stroke b) by the operation of the cylinder 30. This backward movement of the arbor support 6 separates the tapered hole portion 6b on the arbor support 6 side from the tapered portion 12 of the hob assembly 52.

Next, the robot or the like holding the hob assembly 52 moves in the axial direction by a stroke c, and the tapered part 11
is separated from the tapered hole 20a at the tip of the hob spindle 20. The stroke c is a distance such that the taper portion 11 completely passes through the taper hole portion 20a and the taper portion 12 does not interfere with the taper hole portion 6b.

Thereafter, the hob assembly 52 is taken out in a direction perpendicular to the axis by a robot or the like.

<Effects of the Invention> According to the hob head device according to the present invention, the draw bar having a threaded portion at the tip is movably incorporated into the hob spindle, and the arbor support is
Since a clamp member that is screwed into or separated from the threaded portion is incorporated, the hob assembly can be automatically fixed and released. Therefore, by combining a hob assembly exchange mechanism such as a robot, , replacement work of the hob assembly can be performed automatically, and unmanned operation of the hobbing machine can be realized. Furthermore, since the hob assembly can be automatically fixed and released, the time required for replacing the hob can be shortened, and work safety and reliability can be improved.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional hob head, Fig. 2 is a side view of the hobbing machine, Fig. 3 is a front view of Fig. 2, and Fig. 4 is an assembly of the hob and hob arbor to be replaced in the present invention. FIG. 5 is a sectional view of the hob spindle side of an embodiment of the hob head device according to the present invention, FIG. 6 is a sectional view of the arbor support side of one embodiment, and FIG. 7 is an external appearance of one embodiment. It is a diagram. In the drawings, 1 is a hobhead device, 1a is a hobhead, 2 is a hob, 4 is a main column, 5 is a counter column, 6 is an arbor support, 6b is a tapered hole portion, 10 is a hob arbor, 11 is a tapered portion, and 12 is a tapered portion , 13 is a drawbar through hole, 15 is a drawbar, 20 is a hob spindle, 20a is a tapered hole, 21 is a piston, 22 is a rotary joint, 26 is a rotation stopper pin, 28 is a spline, 30 is a cylinder, 31 is a clamp Part, 32
33 is a hydraulic motor, 33 is a clutch, 52 is a hob assembly, and 63 is a threaded portion at the tip of the drawbar.

Claims (1)

[Claims] 1 A hob assembly formed by fitting and integrally connecting a hob to the outside of a hob arbor having a drawbar through hole in the center and tapered portions at both ends is provided oppositely on the hob head. A hob head device that automatically attaches to and detaches from a hob spindle and an arbor support, the hob head device being driven and rotated and having a tapered hole at the tip, a draw bar having a threaded portion at the tip is incorporated into the hob spindle, and the draw bar is movable forward and backward with respect to the arbor support, and the arbor support having a tapered hole at its tip is movable toward and away from the hob spindle, and within this arbor support, tapered portions at both ends are connected to the tip of the hob spindle. A clamp member is provided that is screwed into or separated from the threaded portion of the drawbar tip that is passed through the through hole of the hob assembly supported by the tapered hole portion of the hob assembly and the tapered hole portion of the tip of the arbor support. hobhead equipment.