JPH0411005Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an automatic tool changer (ATC) device for a honing machine.

Prior Art and Problems In conventional honing machines, the horn head was attached and detached by hand. On the other hand, it is desirable to be able to automatically attach and detach a plurality of different types of horn heads as needed, but to do so, it is necessary to have a tool holder that accommodates these different horn heads, a means for supplying coolant to the processing area of the workpiece, A horn guide for introducing the horn head into the workpiece, and a master gauge for calibrating the amplifier when replacing the horn head must be attached to the honing machine so that the diameters of different types of horn heads can be measured with one amplifier.

However, since the atmosphere around the honing machine contains refrigerant mist and abrasive grains scattered from the horn head, an ATC device with a complicated mechanism is undesirable from a reliability standpoint. I need. Moreover, it is desirable to be able to add an ATC device that requires as little space as possible without modification to an existing honing machine that uses a manual tool change system.

Solution to the Problem For this reason, the ATC device according to the present invention includes a drum that is rotatable around an axis parallel to the axis of the main shaft of a honing machine, and a drum that extends over a specific arc range of a circle drawn by the axis of the main shaft on this drum. a plurality of tool holders distributed and accommodating different types of horn heads; a sizing master gauge provided in each of these tool holders; and a plurality of tool holders distributed over other arcuate ranges of the circle. A horn guide, a servo motor that rotates the drum,
It is equipped with a servo motor that moves the drum in the axial direction.

Embodiment In FIGS. 1 and 2, 1 is the main shaft of a honing machine, and 2 and 3 are horn heads as tools of different sizes that are replaceably attached to this main shaft. The drum 4 of the ATC device is connected to the axis X of the main shaft 1.
It is rotatable about an axis P-Q parallel to -Y. Tool holders 6 to 12, which accommodate horn heads of seven different diameters, are located in a part of the virtual circle drawn by the axis of the spindle 1 on the rotating drum 4.
are provided in a distributed manner, and three different types of horn guides 13 to 15 are provided in other ranges in a distributed manner. A master gauge 16 for the horn head is attached to each tool holder.
In FIG. 1, a workpiece W is attached to the lower end surface of the horn guide 14. As shown in FIG. This horn guide 14
serves as a guide for introducing the horn head 2 into the workpiece W, and at the same time serves to supply coolant to the workpiece location via its annular gap 17. The master gauge 16 in the tool holder 7 has the same inner diameter as the required finished inner diameter of the workpiece to be machined by the horn head 3 housed in the tool holder 7, and the master gauge 16 is connected to a master gauge from a pair of nozzles (not shown) in the horn head 3. Air back pressure generated when air is blown onto the inner surface of 16 is converted into an electrical signal by a pneumatic-electrical converter and stored in an amplifier in the sizing device as a sizing point.

Now, attach the required horn head to the tool holder 6 to 12.
The drum 4 is attached to the spindle 1 from
must be brought to the desired rotational and axial position. The mechanism for this will be explained below.

A shaft 21 that holds the drum 4 is provided with a key 22 around the periphery, and this key 22 is slidably inserted into a vertical groove 24 on the inner peripheral surface of a rotating sleeve 23 that concentrically surrounds the shaft 21. 21 and sleeve 23 are rotationally connected. The sleeve 23 is supported at both ends by bearings 25 in a cylindrical fixed housing 26, and has a worm gear 27 formed on its outer periphery.
It is rotationally driven by a rotary servo motor 29 via a worm 28 that meshes with the worm 28 .

In order to supply refrigerant to the gap 17 of the horn guide 14, a sliding ring 3 tightly and slidably surrounds the shaft 21.
1 is fixed to the housing 26 by a rod 32, its refrigerant supply hole 33 communicates with a hole 34 in the shaft 21, and a hose 35 is connected to the horn guide 1 through this hole 34.
4 into the gap 17.

A rotary servo motor 42 attached to the frame 41 drives the drum 4 through gears 43 and 44.
A ball screw nut 46, which is disposed coaxially with respect to the shaft 21 of the frame 41 and is rotatably supported by the frame 41 by a bearing 45, is rotationally driven. A ball screw 47 that fits into the ball screw nut 46 has its lower end fixed to a cylindrical housing 48 , and the upper end of the shaft 21 is rotatably supported by a bearing 49 in the housing 48 . The sliding piece 51 attached to the bracket 50 of the housing 48 is attached to the frame 41.
The vertical guide piece 52 attached to the axis P-Q
It is guided parallel to the In this way, the ball screw nut 46 rotationally driven by the servo motor 42 allows the ball screw 47 and therefore the shaft 21 of the drum 4 to be raised and lowered.

Effect: To remove the horn head 2 from the main shaft, the drum 4 is rotated by the servo motor 29 to bring the tool holder 6 for the horn head, for example, to the position of the axis X-Y. Then, the servo motor 42 causes the ball screw 47 and the shaft 21 to rotate the drum 4.
The horn head 2 is removed from the spindle 1 in a well-known manner and placed in the tool holder 6.

To attach the horn head 3 to the main shaft 1, the servo motor 29 rotates the drum 4 to bring the tool holder 7 to the axis X-Y position, the servo motor 42 raises the drum 4, and the horn head 3 is attached to the main shaft 1. Attach to. At this time, the air supplied through the main shaft 1 from a pair of nozzles (not shown) of the horn head 3, which is still stuck in the master gauge 16, is blown onto the inner surface of the master gauge 16, and the air back pressure generated at that time is is converted into an electrical signal by a pneumatic-to-electrical converter. The electrical value corresponding to this air back pressure is stored as a sizing point (zero point) in an amplifier in the sizing device. As mentioned above, this memorized sizing point corresponds to the inner diameter of the master gauge and therefore the target finishing dimension of the workpiece W to be machined, so until this sizing point is reached,
The workpiece is processed. Since the sizing point is thus memorized each time the horn head is replaced, it is possible to automatically calibrate the sizing device when replacing the horn head.

In the diagram, there are seven types of horn heads, so drum 4
Seven tool holders 6 to 12 are provided, and each time the horn head is replaced, the sizing device is automatically calibrated by one amplifier using a master gauge in each tool holder. On the other hand, three types of horn guides 13 to 15 are provided. In this case, for example, the horn guide 13 is connected to three tool holders 6.
The horn guide 14 has an inner diameter that can guide the horn head located in the tool holders 9 and 1.
By making the horn head have an inner diameter that can guide the horn head at 0, and increasing the amount of floating by the universal joint at the tip of the main shaft 1 to which the horn head is attached, there is no need to provide as many horn guides as there are types of horn heads as in the past. There is no practical problem at all.

In this way, according to the present invention, the drum 4 is driven by the two servo motors 29 and 42 in the ATC device, and the horn head can be directly attached to and removed from the main shaft 1 of the honing machine. No attachment/detachment device is required, and the device is simplified and has a compact configuration. Furthermore, since the conventional mechanism around the spindle 1 can be used as is, the ATC device can be added to existing equipment to perform automatic tool exchange.

Moreover, the master gauge 16 is attached to each tool holder 6 to 1.
By attaching it to 2 and using the tool holder as a sizing calibration gauge, one sizing device can handle many different diameters, and the sizing point can be memorized and calibrated every time the tool is replaced. Therefore, the repeatability error of the master gauge when changing tools can be eliminated and sizing accuracy can be improved. Also horn guide 13~
Considering that 15 only has the function of guiding the introduction of the horn head into the workpiece during machining and supplying coolant, it is possible to use fewer horn guides than the types of horn heads and therefore tool holders. The space required can also be reduced by reducing the outer diameter of the drum 4.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention, and FIG. 2 is a bottom view of the tool holder. 1... Main shaft, 2, 3... Horn head, 4...
Drum, 6-12... Tool holder, 13-15...
...Horn guide, 16...Master gauge, 29,
42... Servo motor.

Claims (1)

[Claims for Utility Model Registration] 1. Specification of a drum rotatable around an axis parallel to the axis of the main shaft of a honing machine to which different types of horn heads can be attached, and a circle drawn by the axis of the main shaft on this drum a plurality of tool holders distributed over an arc range of said circle and accommodating different types of horn heads; a master gauge for sizing provided on each of these tool holders; An automatic tool changer for a honing machine, comprising a plurality of horn guides provided, a servo motor for rotating a drum, and a servo motor for moving the drum in an axial direction. 2. The automatic tool changer for a honing machine according to claim 1, wherein the number of horn guides is smaller than the number of tool holders. 3. The automatic tool changer for a honing machine according to claim 2, wherein the horn guide has an inner diameter large enough to guide a plurality of horn heads in the tool holder. 4. A shaft that is located on the axis of the drum and holds the drum is rotationally driven by a servo motor via a sleeve that concentrically surrounds this shaft and is connected to it only in the rotational direction and is movable relative to the shaft in the axial direction. An automatic tool changer for a honing machine according to claim 1, which is characterized in that: 5. The utility model according to claim 4, characterized in that the shaft of the drum has a key around its periphery, and the key is slidably fitted into a vertical groove on the inner circumferential surface of the sleeve. Automatic tool changer for honing machines. 6. The shaft of the drum is connected to a ball screw via a connecting means that connects only in the axial direction, and a ball screw nut that fits onto the ball screw is rotatably supported and rotationally driven by a servo motor. An automatic tool changer for a honing machine according to claim 1 of the utility model registration claim.