JPH07266218A - Device for stopping spindle stock of honing machining device - Google Patents

Abstract

PURPOSE:To quickly stop a spindle stock at a desired position at the time of interruption to service in a honing device, of which spindle stock is reciprocated by the drive of a linear motor. CONSTITUTION:A spindle stock 20 is supported by a machining device main body such as a column 14 freely to be elevated, and reciprocated by the work of a linear motor 24. The linear motion of the spindle stock 20 is converted to the rotary motion of a disc 58 by a ball screw shaft 46 and a ball screw nut 59. On the other hand, a caliper 60 to be switched between the disc 58 pinching condition and the opening condition is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a headstock stopping device for stopping a headstock of a honing machine which is reciprocally driven by a linear motor at an arbitrary position.

[0002]

2. Description of the Related Art Generally, in a honing machine, a spindle having a honing tool at its tip is rotatably supported by a spindle stock, and while the spindle rotates at high speed, the spindle and the stockstock reciprocate integrally in a direction parallel to the spindle. By doing so, the inner peripheral surface of the work is processed.

In recent years, it has been attempted to make the headstock reciprocate by a linear motor. With this linear motor, the mover is driven in a state where it does not come into contact with the stator, so there is much less wear damage and running resistance than the cylinder mechanism and ball screw mechanism, which are the same linear drive mechanism, and the movement of the headstock is reduced. There is an advantage that the direction can be reversed quickly.

[0004]

As described above, in the linear motor, the mover and the stator are always in non-contact with each other. Therefore, if the energization of the linear motor is abruptly stopped due to a power failure or other causes, honing is performed. There is a risk that the mover fixed to the headstock side becomes free with respect to the stator fixed to the processing apparatus body side, and the headstock rapidly drops to the lower limit position due to its own weight. Also, if you want to stop the reciprocating motion of the headstock immediately for some reason, simply turning off the power to the linear motor will lower the headstock to the lower limit position in the same manner as above, so you can place the headstock in any position. You can't stop in an emergency.

As means for performing such an emergency stop, a rack extending in the reciprocating direction is fixed on the headstock side, and in an emergency, a locking member is inserted between the teeth of the rack to insert the rack and the headstock. However, since the rack reciprocates at a relatively high speed together with the headstock, the locking member is always properly inserted between the teeth of the rack. This is not always the case, and in general there is the inconvenience that a so-called tooth jump occurs and the headstock cannot be stopped quickly.

In view of the above circumstances, the present invention provides a honing machine in which a headstock reciprocates by driving a linear motor, which is capable of quickly and reliably stopping the headstock at an arbitrary position. The purpose is to do.

[0007]

As means for solving the above problems, the present invention provides a spindle provided with a honing tool, a headstock for rotatably supporting the spindle, and the headstock for the spindle. In a honing machine equipped with a device body movably supported in a direction parallel to the headstock and a linear motor that reciprocates the headstock along a direction parallel to the spindle, either the headstock or the device body. A rotating body rotatably supported on one side, and a motion converting means for converting a linear motion of the headstock into a rotating motion of the rotating body,
It is provided with a brake means for switching between a released state in which the rotation of the rotating body is allowed and a braking state in which the rotation of the rotating body is blocked (Claim 1).

More preferably, the rotating body and the braking means are provided on the apparatus main body side (claim 2).

As the braking means, it is preferable that at least a part of the rotating body is a disk, and a holding means for switching the disk between a state of being held by a friction material and a state of being released by a friction material is provided. (Claim 3).

As the motion converting means, one provided with a ball screw mechanism is preferable (claim 4).

Further, in each of the above devices, a holding means for holding the braking means in a braking state and a state in which the braking means is released from the braking state against the holding force of the holding means by receiving power supply. By providing the brake switching means for switching to, and connecting the brake switching means to a power source common to the linear motor, a more excellent effect as described later can be obtained (claim 5).

[0012]

According to the above apparatus, the honing operation is performed by operating the linear motor while the brake means is in the released state, whereby the rotary body rotates in the forward and reverse directions as the headstock reciprocates. To do. When the driving of the linear motor is stopped due to a power failure or the like, the headstock can be immediately stopped on the spot by switching the braking means from the released state to the braking state to prevent the rotation of the rotating body. .

Here, in the apparatus according to the second aspect, since the rotating body and the braking means are provided on the apparatus main body side, that is, the fixed side, unlike the case where the braking means is provided on the headstock side, the braking means is provided. Does not reciprocate, so that the fluid pressure piping, electric wiring, etc. for activating the braking means may remain fixed.

According to the third aspect of the present invention, the headstock is reliably braked with a simple structure by the so-called disc brake including the disc and the holding means. Further, as compared with a drum brake in which the rotating body is a drum, the moment of inertia of the rotating body itself is small, and the reciprocating drive loss of the headstock is small accordingly.

In the device according to the fourth aspect, the reciprocating motion of the headstock is converted into the rotary motion of the rotating body at an extremely high speed increasing ratio by the ball screw mechanism having high transmission efficiency, so that the braking performance by the braking means is correspondingly increased. Get higher

In the device according to the fifth aspect, since the linear motor and the brake switching means are connected to a common power source, when the headstock is driven by the operation of the linear motor, the brake switching is performed against the holding force of the holding means. By means of the means the braking means is switched to the released state and braking is prevented during reciprocating drive. On the other hand, when the power is turned off due to the switching of the power switch or a power failure, the braking means is automatically switched from the released state to the braking state by the holding force of the holding means at the same time when the linear motor is stopped. The headstock almost stops on the spot.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

The honing machine shown in FIG. 1 includes a bed 12 on which a work 10 is placed, and a column 14 is erected on the bed 12. In this column 14,
A pair of upper and lower support plates 16 and 18 are formed, and a headstock 20 is supported between the two in a vertically movable manner. In detail, a pair of vertical guide rods 22 are fixed between the support plates 16 and 18, and these guide rods 22 vertically penetrate the headstock 20, and between the guide rods 22 and the headstock 20. A slide bearing (not shown) is provided in.

A linear motor 24 is mounted on the support plate 16.
Is installed. The linear motor 24 includes a rod-shaped mover 26 extending vertically and a cylindrical stator 28 surrounding the mover 26. The stator 28 is fixed on the upper support plate 16, and The headstock 20 is connected to the lower end of the mover 26. The mover 26
On the other hand, a stator tooth extending vertically is provided on the stator 2
8, a magnetic flux generator having a coil or the like is provided at a position facing the mover teeth, and as is well known, a thrust force is generated by a magnetic field formed between the magnetic flux generator and the mover teeth. Is generated, and the mover 26 is
The headstock 20 is vertically reciprocally driven in a non-contact state.

The headstock 20 has a main shaft 3 extending vertically.
0 is rotatably supported. A honing tool 32 is fixed to the lower end of the main shaft 30, and a plurality of honing stones 34 are arranged side by side in the circumferential direction on the main body of the honing tool 32. Each grindstone 34 is connected to a cutting motor 36 provided on the headstock 20 via a drive transmission mechanism (not shown), and is expanded and contracted in the radial direction by the operation of the cutting motor 36.

A main shaft drive motor 38 is fixed to the upper support plate 16 of the column 14, and a vertically extending transmission shaft 40 is rotatably supported.
0 and the output shaft of the main shaft drive motor 38 are connected via a drive transmission mechanism 42 including a pulley and a belt. Then, the lower portion of the transmission shaft 40 and the upper portion of the main shaft 30 are coupled by a spline 44, so that both shafts 40,
Reference numeral 30 is not relatively rotatable and is relatively movable in the axial direction (vertical direction). Therefore, the spindle drive motor 38
The main shaft 30 and the honing tool 32 are rotationally driven at high speed via the drive transmission mechanism 42 and the transmission shaft 40.

Next, a headstock stopping device 50 for stopping the headstock 20 will be described with reference to FIG.

A ball screw shaft 46 is vertically fixed to the upper part of the headstock 20. This ball screw shaft 4
Reference numeral 6 projects above the upper support plate 16 through a through hole 48 formed in the upper support plate 16.

On the upper surface of the upper support plate 16, a cylindrical support member 52 is fixed at a position surrounding the ball screw shaft 46, and a cylindrical disk member 56 is rotatably held inside the support member 52 via a bearing 54. A horizontal disc (disc) 58 is formed on the upper end of the disc member 56. Then, a ball screw nut 59 is fixed inside the disc member 56.
The ball screw shaft 46 is threadably inserted into the shaft 9.

On the upper support plate 16, a caliper (holding means) 60 is installed at a position lateral to the support member 52. The caliper 60 is provided on the disc 58.
A pair of pads (friction material) at the position where the outer periphery of the
62, each pad 62 has a rod 63 extending vertically.
Are connected to each other, and each rod 63 is supported by the caliper body so as to be vertically movable.

A piston 64 is provided in the middle of each rod 63.
The piston 64 is housed in a pressure chamber 66 formed in the main body of the caliper 60. In the pressure chamber 66, the disc 58 is separated from the piston 64.
A compression spring (holding means) 68 for pressing the piston 64 toward the disc 58 side is provided in the space on the opposite side to the air supply holes 6, 71 in the space near the disc 58 with the piston 64 as a boundary. Is connected to an air pressure supply circuit (brake switching means) 70 through. In the state where high pressure air is not supplied from the air pressure supply circuit 70 into the pressure chamber 66, the piston 64 is pressed against the disk 58 side by the elastic force of the compression spring 68, and both pads 62 cause the outer peripheral edge portion of the disk 58. While holding from above and below,
When high-pressure air is supplied from the air pressure supply circuit 70 into the pressure chamber 66, the piston 64 is pushed back in the direction away from the disk 58 against the elastic force of the compression spring 68, so that both pads 62 are released. Is the above disk 5
8 is separated from the outer peripheral edge portion (that is, the disk 58 is released).

Here, the air pressure supply circuit 70 includes a solenoid valve (not shown), which is connected to a power source common to the linear motor 24, and an exciting current is supplied from the power source to the solenoid valve. The air is supplied into the pressure chamber 66 only when the pressure chamber 66 is operated.

Next, the operation of this device will be described.

First, when a power switch (not shown) is turned on, electric power is supplied to the linear motor 24, and the linear motor 24 becomes operable. Further, when the power is turned on, the air pressure supply circuit 70 enters the air supply state, and the air supply by the air pressure supply circuit 70 switches both pads 62 of the caliper 60 to the state where the disk 58 is released.

Then, the spindle motor and the honing tool 34 are integrally driven to rotate by the operation of the spindle drive motor 38 in a state in which each grindstone 34 is projected to a position where it is brought into contact with the inner peripheral surface of the workpiece 10 by the operation of the cutting motor 36. The operation of the linear motor 24 causes the headstock 20 and the spindle 3 to move together.
0 and the honing tool 34 are integrally moved up and down to perform honing processing on the inner peripheral surface of the work 10. At this time, the vertical movement of the ball screw shaft 46 that moves up and down together with the headstock 20 causes the disk 5 to move through the nut 59.
8 is converted into rotary motion, but as described above, the caliper 6
Since 0 is held in a state where the disk 58 is released, the vertical reciprocating drive of the headstock 20 by the linear motor 24 is smoothly performed as in the conventional case.

From this state, when the power supply to the linear motor 24 is stopped due to a power failure or the like, the mover 26 fixed to the headstock 20 side becomes free from the stator 28. Here, if there is no emergency stop means, the headstock 20 may drop rapidly to the lower limit position due to its own weight. In this device, however, the air pressure supply circuit 70 causes the caliper 60 to move due to the stop of the power supply. Pressure chamber 66
The air supply to the inside is also stopped, and both pads 62 pinch the disk 58 from above and below to prevent its rotation due to the elastic force of the compression spring 68, so that the headstock 20 that falls in conjunction with the rotation of this disk 58 is also prevented from falling. As a result, the headstock 20 is stopped almost at the same time as the occurrence of the power failure.

As described above, this device converts the ascending / descending movement of the headstock 20 into the rotational movement of the disc 58, and the headstock 20 is braked by the disc brake including the disc 58 and the caliper 60. Therefore, for example, as in the case of using a mechanism in which a rack is provided on the headstock 20 side and a locking member is inserted between the teeth of the rack at the time of emergency stop, a phenomenon such as so-called tooth jump may occur. Instead, the headstock 20 can be reliably stopped at an arbitrary position in an emergency, and the safety of the honing machine can be further improved.

In particular, in this embodiment, since the air pressure supply circuit 70 for switching the caliper 60 is connected to the power source common to the linear motor 24, the linear motor 24 is surely interlocked with the stoppage in the event of a power failure. The headstock 20 can be braked by a disc brake, and when it is desired to make an emergency stop of the headstock 20 due to some accident, the linear motor 2 can be simply turned off.
It is possible to stop the drive by 4 and the headstock 20 at the same time surely and quickly.

The present invention is not limited to such an embodiment, and the following modes can be adopted as an example.

(1) In the present invention, as the mechanism for converting the reciprocating motion of the headstock 20 into the rotary motion of the rotating body, various conventionally known mechanisms can be applied. For example, instead of the ball screw shaft 46,
A rack 72 as shown in FIG. 3 is fixed to the headstock 20 side, while a rotary shaft 74 is rotatably supported on the honing machine body side, and a pinion 76 and a disk 58 are fixed to the rotary shaft 74. The disk 58 may be engaged with the rack 72 and the disc 58 may be held and released by the caliper 60 similar to that of the above-described embodiment. However, if the ball screw mechanism as in the above embodiment is used, the amount of rotation of the disk 58 with respect to a certain amount of displacement of the headstock 20 is large (that is, the increase ratio of the rotational speed of the disk 58 to the reciprocating speed of the headstock 20). Therefore, the disc 58 can be rotated at a higher speed, which has the advantage that the braking performance of the disc brake can be further improved.

When using the ball screw mechanism,
The layout is not limited to that shown in the above-described embodiment, and for example, as shown in FIG. 4, while supporting the ball screw shaft 46 rotatably on the column 14 side, a ball screw nut 77 screwed with the ball screw shaft 46 is provided. The disk 58 may be fixed to the headstock 20 and the ball screw shaft 46 may be fixed. Also in this case, the disk 58 rotates together with the ball screw shaft 46 as the headstock 20 moves up and down. Therefore, by using the disk 58 to configure a disk brake similar to the above-described embodiment, the headstock 20 is stopped. It is possible to carry out.

(2) In the above embodiment, the disk 58, which is a rotating body, is supported on the honing machine body side (column 14 side), but this rotating body is mounted on the headstock 20 side. Good. For example, the rack 72 shown in FIG. 3 is fixed to the honing machine body side, and the pinion 76, the disk 58, and the caliper 60 are attached to the headstock 20.
Even if mounted on the side, the headstock 20 can be braked and stopped. Further, in the structure shown in FIG. 4, the ball screw shaft 46 is non-rotatably fixed to the column 14 side, a nut screwed with the ball screw shaft 46 is rotatably attached to the headstock 20 side, and a disk 58 is attached to this nut. May be fixed, and a caliper that holds and releases the disk 58 may be attached to the headstock 20 side. However, if the braking means such as the caliper 60 is provided on the honing processing apparatus main body side as in the above embodiment,
Unlike the case where this braking means is provided on the headstock 20 side, it is not necessary to move the braking means even during honing processing. Therefore, hydraulic piping, pneumatic piping, electric wiring, etc. for operating this braking means are honing processing equipment. Since it can be fixed to the main body side, there is an advantage that the assembling and maintenance of the device are easier.

(3) In the above embodiment, a disc brake is used as the braking means, but a drum is provided as a rotating body instead of the disc 58, and the headstock 20 is used.
May be braked with a drum brake. However, if the disc brake as in the above embodiment is used,
There is an advantage that the moment of inertia of the rotating body (that is, the disk 58) can be further reduced, and the drive loss of the headstock 20 by the linear motor 24 can be further suppressed.

[0039]

As described above, according to the present invention, the linear motion of the headstock is converted into the rotary motion of the rotating body, and the released state in which the rotation of the rotating body is allowed and the braking state in which the rotation of the rotating body is blocked are converted. Since it is equipped with a braking means that can be switched to, the headstock can be stopped surely and quickly at an arbitrary position by switching the braking means from the released state to the braking state. This has the effect of significantly improving safety.

In the apparatus according to the second aspect, since the rotating body and the braking means are provided on the apparatus main body side, that is, the fixed side, unlike the case where the braking means is provided on the headstock side, the position of the braking means is changed. It is possible to keep it fixed at all times, so that the fluid pressure piping for operating this braking means can be fixed to the main body of the device with electrical wiring, etc., and the assembly and maintenance of the device can be made easier. There is an effect that can be done.

In the device according to the third aspect of the present invention, the so-called disc brake consisting of the disc and the sandwiching means can surely brake the headstock with a simple structure, and compared with the drum brake in which the rotating body is a drum. The effect of reducing the moment of inertia of the rotator itself to further suppress the reciprocating drive loss of the headstock can be obtained.

In the device according to the fourth aspect, since the ball screw mechanism having high transmission efficiency is used as the motion converting mechanism,
The reciprocating motion of the headstock can be converted into the rotational motion of the rotating body at a high speed increasing ratio to rotate the rotating body at a high speed, and the braking performance of the braking means can be enhanced accordingly.

In the apparatus according to the fifth aspect, since the linear motor and the brake switching means are connected to the common power source,
When the power is turned off due to switching of the power switch or power failure, the braking means can be automatically and reliably switched from the released state to the braking state simultaneously with the stop of the linear motor, without using special control means. There is an effect that the safety of the device can be further enhanced.

[Brief description of drawings]

FIG. 1 is a front view of a honing device according to an embodiment of the present invention.

FIG. 2 is a partial sectional front view showing a headstock stopping device provided in the honing processing device.

FIG. 3 is a perspective view showing a modified example of the headstock stopping device.

FIG. 4 is a sectional front view showing a modified example of the headstock stopping device.

[Explanation of symbols]

 10 Work 12 Bed (Honing Machine Body) 14 Column (Honing Machine Body) 20 Headstock 24 Linear Motor 30 Main Spindle 32 Honing Tool 46 Ball Screw Shaft 50 Headstock Stopping Device 58 Disc 59 Ball Screw Nut 60 Caliper (Clamping) 70) Air pressure supply circuit (brake switching means) 72 Rack 76 Pinion 77 Ball screw nut

Claims (5)

[Claims] 1. A spindle provided with a honing tool,
A headstock that rotatably supports the spindle, an apparatus main body that supports the headstock so as to be movable in a direction parallel to the spindle, and a linear motor that reciprocates the spindle stock along a direction parallel to the spindle. In a honing machine equipped with, a rotating body rotatably supported by either one of the headstock and the apparatus body, and a motion converting means for converting a linear motion of the headstock into a rotary motion of the rotating body. A headstock stopping device for a honing machine, comprising: brake means for switching between a released state that allows rotation of the rotating body and a braking state that blocks rotation of the rotating body. 2. The headstock stopping device for a honing machine according to claim 1, wherein the rotating body and the brake means are provided on the apparatus main body side. 3. A headstock driving device for a honing machine according to claim 1 or 2, wherein at least a part of said rotating body is a disc, and said disc is held by a friction material as said braking means and released. A headstock control device for a honing machine, comprising a holding means that can be switched to a ready state. 4. The headstock control device for a honing machine according to claim 1, further comprising a ball screw mechanism as the motion converting means. . 5. The headstock drive device for a honing machine according to claim 1, wherein the braking means is held by holding means for holding the braking means in a braking state and electric power is supplied. And a brake switching means for switching from the braking state to the released state against the holding force of the holding means, and the brake switching means is connected to a power source common to the linear motor. Headstock control device.