JP2670508B2 - Grinding wheel cutting device and honing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grindstone cutting device and a honing machine, and more particularly to a grindstone cutting technique of a forced cutting system for forcibly cutting a grindstone of a honing tool. .

[0002]

2. Description of the Related Art A radial surface of a workpiece (hereinafter referred to as a work),
For example, honing is one of the processing methods for precisely finishing the inner diameter surface of a work. In honing, the grindstone of the honing tool and the work are kept relatively floating, and the grindstone is rotated and reciprocated,
Precision expansion is performed on the inner diameter surface of the work by the expanded notch of this grindstone.

By the way, the above-mentioned grindstone cutting device has a pressure cutting method in which a constant load is applied to the grindstone, and a constant-speed cutting or forced cutting in which the grindstone is expanded at a predetermined speed by a cone driven by a cutting motor. The cutting method is roughly classified into the cutting method, and the latter is currently the mainstream (see, for example, JP-A-51-93496).

[0004] This grindstone cutting device of the forced cutting system is
As shown in FIG. 6, a cutting shaft b is provided in the rotary main shaft a of the honing machine, and the cutting shaft b is connected to the rotary main shaft a through a pin c and an insertion hole d to be integrated with the rotary main shaft a. , And can be relatively moved up and down. The tip end side of the cutting shaft b is connected to the cone rod f of the honing tool e, and the screw mechanism g
It is linked to a cutting motor (not shown) provided in the apparatus main body h via.

The screw mechanism g includes a screw shaft j rotatably supported by the slide body i, and a drive member k supported by the screw shaft j so as to be able to advance and retract. This drive member k
Is connected to a pin c of the cutting shaft b via a driven member 1 provided on the rotating main shaft a so as to be movable in the vertical direction. The screw shaft j is key-fitted to a notch drive shaft m that is rotatably supported by the device body h, rotates integrally with this, and is relatively movable in the vertical direction. The cutting drive shaft m is connected to a driving shaft (not shown) of the cutting motor.

By the rotational driving of the cutting motor, the cutting shaft b moves up and down relative to the rotary main shaft a via the screw mechanism g, and the cone rod f connected thereto is moved. The honing tool e has a structure in which the grindstones n, n, ... Are extended (cutting). Reference symbol o denotes a grindstone return spring which constantly urges the cutting shaft b upward through the driven member l.

[0007]

However, such a structure has the following problems.

That is, when the grindstone is expanded, a force in the direction of contracting the grindstones n, n, ... Is exerted on the grindstones n, n, ... As shown in FIG. 7, due to the reaction force from the work. A force F ₁ acts axially upward on the cutting shaft b, the pin c and the driven member 1 via the cone rod f. On the other hand, the driving member k is screwed with the screw shaft j,
Force F ₂ in the axial direction downwards is acting.

Therefore, the connecting portion p of the driving member k is
Bending as shown in the figure occurs, and due to this bending, the descending amount of the drive member k due to the rotation of the screw shaft j is not accurately transmitted to the cut shaft b, and the expansion accuracy is reduced.

Further, due to the action of the above-mentioned forces F ₁ and F ₂ , a component force in the direction A is generated in the upper part of the driving member k, and a component force in the direction B is generated in the lower part of the driving member k. Not even contact. Thereby, the screw shaft j and the driving member k
The contact portion of the above-mentioned part is unevenly worn to cause backlash, the transmission efficiency of this part is poor, and there is also a synergistic action with the above-mentioned bending, which also leads to a decrease in expansion accuracy.

The present invention has been made in view of the above conventional problems, and an object thereof is to perform a grindstone cutting operation only during honing in a forced cutting method for forcibly cutting a grindstone of a honing tool. The present invention is to provide a grindstone cutting device having a configuration capable of performing the grinding with high accuracy, and a honing machine provided with the grindstone cutting device.

[0012]

In order to achieve the above object, a grindstone cutting device according to the present invention is provided with a cutting shaft movably provided in a rotating main shaft in the axial direction, and the cutting shaft in the axial direction. A cutting drive means for moving the cutting wheel and a whetstone expanding member provided in the honing tool for expanding the whetstone by moving the cutting shaft in the axial direction, and the cutting driving means is drivingly connected to the rotary spindle. A first planetary gear mechanism, a second planetary gear mechanism drivingly connected to the first planetary gear mechanism, and a screw mechanism drivingly connecting the second planetary gear mechanism and the cutting shaft. Drive control means for driving the second planetary gear mechanism,
It is characterized in that the screw mechanism is in a cutting operation stopped state when the driving of the drive control means is stopped, and the screw mechanism is made to perform a cutting operation by rotational driving of the drive control means.

The honing machine of the present invention is capable of reciprocating in the axial direction of the surface of the workpiece to be machined, and has a rotating main shaft rotatably supported about the axis and the rotating main shaft rotating about the axis. A spindle rotating means for driving, a spindle reciprocating means for reciprocating the rotating spindle in the axial direction of the surface to be processed, and a whetstone mounted on the tip of the rotating spindle and having a grindstone surface along the surface to be processed are expandable and contractible. It is characterized by comprising a honing tool and the grindstone cutting device for cutting the grindstone of the honing tool.

[0014]

In the processing of the work surface of the workpiece by the honing machine of the present invention, the honing tool is given a rotation and a reciprocating motion through the rotary main shaft, and the grindstone of the honing tool is fixed by the grindstone cutting device. Incisions are made and the surface to be machined is precision-finished.

In this case, the cutting drive means of the grindstone cutting device includes a first planetary gear mechanism drivingly connected to the rotating main shaft and a second planetary gear mechanism drivingly connected to the first planetary gear mechanism. A screw mechanism for drivingly connecting the second planetary gear mechanism and the cutting shaft, and a drive controller for driving the second planetary gear mechanism.

Accordingly, the screw mechanism is arranged coaxially with the cutting shaft, and when the grinding wheel is expanded,
Even if the reaction force from the workpiece acts on the grindstone, the connecting portion between the screw mechanism and the cutting shaft does not loosen due to bending or uneven wear.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

A honing machine according to the present invention is shown in FIG.
This honing machine is a vertical type, and has a rotary spindle 2 provided with a honing tool 1 at its tip, a spindle rotation drive unit (spindle rotation means) 3, a spindle reciprocation drive section (spindle reciprocation means) 4, a grindstone drive section (grinding wheel cutting device). 5) and control unit (control means) 6
And so on as main parts. The work W is detachably supported in a floating state in the horizontal direction on a processing table (not shown) in a state where the axis line of the work surface Wa is oriented in the vertical direction.

A honing tool (so-called honing mandrel or honing head) 1 is replaceably mounted on the tip, that is, the lower end of a rotary spindle 2, and has a plurality of grindstones arranged radially expandable and contractible therein. 10,
.. and a cone rod (grinding stone expanding member) 11 for expanding the same (cutting operation).

As shown in FIG. 3, each grindstone 10 has a grindstone surface 10a along the work surface Wa of the work W. The cone rod 11 is provided in the honing tool 1 so as to be movable in the vertical direction, and the tip portion 11a thereof is provided.
Is a tapered cone that presses the mounting base 10b of each grindstone 10, and is a base rod 11b that is an upper part of the cone.
Are connected to a cutting shaft 30 described later. Although not shown, the grindstones 10, 10, ... Are constantly elastically biased in the direction of contraction and closure by a return spring.

Then, the grindstone 10 of the honing tool 1,
.. are expanded by the downward movement of the cone rod 11 (cutting operation), and contracted by the return spring (returning operation) by the upward movement (projection) of the cone rod 11. Becomes

It should be noted that the cone 11a may be tapered upside down from the illustrated embodiment so that the grindstones 10, 10, ... Of the honing tool 1 may be expanded / contracted by a completely opposite operation. Good.

The rotary main shaft 2 imparts rotary motion and reciprocal motion to the honing tool 1, and the slide main body 1
5, while being rotatably supported by a bearing 16a,
It is rotatably and rotatably supported by the machine body 25 via a bearing 16b in the vertical direction. The rotary spindle 2 is provided with a honing tool 1 at a lower end mounting portion 2a thereof, and a spindle rotary drive unit 3 including a spindle drive motor 17 and the like,
The main shaft reciprocating drive unit 4 including the vertically moving cylinder 18 and the like are linked to each other.

A driven pulley 20 is attached to a lower portion of the rotary main shaft 2, and the driven pulley 20 is connected to a motor shaft 17a of a main shaft drive motor 17 via a transmission belt 21.
Is drivingly connected to a drive pulley 22 attached to the. The spindle drive motor 17 is arranged on the slide body 15 via a mounting bracket (not shown).

The rotary drive of the spindle drive motor 17 drives the rotary spindle 2, that is, the honing tool 1 to rotate.

The slide body 15 is composed of a pair of vertical guide rods 26, 26 which are arranged in parallel to the machine body 25 in the vertical direction.
It is provided to be able to move up and down.

The upper end 15a of the slide body 15 is connected to the lower end of the piston rod 18a of the vertically moving cylinder 18 attached to the machine body 25. As the vertically moving cylinder 18, for example, a hydraulic cylinder, an air cylinder or the like is used, and in the illustrated embodiment, a hydraulic cylinder is used.

The piston rod 18a of the hydraulic cylinder 18 moves up and down (projects and retracts), so that the rotary main shaft 2, that is, the honing tool 1 is moved up and down through the slide body 15. In this connection, the slide body 1 is
An elevating hole 27a is formed to allow the elevating operation of No. 5 as described above.

The grinding wheel cutting device 5 includes a honing tool 1
The grinding wheels 10, 10, ... Are made to perform a cutting operation, and are constituted by the cone rod 11 as a grinding wheel expanding member, a cutting shaft 30, and a cutting driving unit (cutting driving means) 31 as main parts.

The cutting shaft 30 is provided in the shaft hole 35 of the rotating main shaft 2 so as to be movable in the vertical direction (axial direction). A lower end portion 30a of the cutting shaft 30 is connected to the base rod 11b of the cone rod 11, and an upper end portion 30b thereof is connected to the cutting drive portion 31.

The cutting drive unit 31 moves the cutting shaft 30 in the vertical direction (axial direction), and includes a first planetary gear mechanism 40, a second planetary gear mechanism 41, a screw mechanism 42, and a drive control unit. (Drive control means) 43 is configured as a main part.

The first planetary gear mechanism 40 includes a sun gear 40a and a planetary gear 40 which are arranged horizontally and meshed with each other.
b and an internal gear 40c, and a carrier 47 that supports the planetary gear 40b.

The sun gear 40a is coaxially and integrally attached to the rotary main shaft 2 via a rotation stop key 45.

The planetary gear 40b revolves along the outer circumference of the sun gear 40a. In the illustrated embodiment, as shown in FIG. 4, a plurality of planetary gears 40b are arranged at equal intervals in the circumferential direction around the sun gear 40a. (3 in the illustrated embodiment)
One) is arranged. Specifically, each planetary gear 40b
Is rotatably supported on a carrier 47 via a support shaft 46 and is meshed with the sun gear 40a.

As will be described later, the carrier 47 has a bearing 5.
It is coaxially and rotatably attached to the rotary main shaft 2 via 0 and 51.

The internal gear 40c guides the revolution of the planetary gear 40b, and the slide body 15 which is the apparatus main body.
Is fixed coaxially with the sun gear 40a and has three planetary gears 40b, 40b, 40b on its inner periphery.
Are engaged.

When the sun gear 40a rotates along with the rotation of the rotary spindle 2, the planetary gears 40b, 40b, 40 are rotated.
b is guided by the internal gear 40c and revolves while rotating,
This orbital force causes the carrier 47 to rotate around the rotation main shaft 2.

The second planetary gear mechanism 41 has a sun gear 41a and a planetary gear 4 which are arranged horizontally and meshed with each other.
1b and the internal gear 41c, and the carrier 47 shared with the first planetary gear mechanism 40. Each sun gear 4
1a, the planetary gear 41b and the internal gear 41c are the first
Sun gear 40a and planetary gear 40 of the planetary gear mechanism 40
b, are arranged in a layered manner below the internal gear 40c.

The sun gear 41a is coaxially and rotatably supported by the rotary main shaft 2 via a bearing 50. The sun gear 41a is integrally formed with a driving female screw member 42a of the screw mechanism 42, as described later.

The planetary gear 41b is the first planetary gear mechanism 4
0 is arranged in the same manner as the planetary gear 40b, and as shown in FIG. 5, each planetary gear 41b is coaxially and rotatably supported on the carrier 47 via the support shaft 46 shared with the planetary gear 40b. At the same time, it is meshed with the sun gear 41a.

As described above, the carrier 47 has the bearing 5
It is coaxially and rotatably supported via a bearing 51 on the outer peripheral portion of the cylindrical portion of the sun gear 41a that is rotatably supported by zero.

The internal gear 41c rotates the planetary gear 41b or rotates the sun gear 41a via the planetary gear 41b. The internal gear 41c is coaxial with the sun gear 41a via a bearing 52 on the outer periphery of the carrier 47. And rotatably supported on the inner periphery of the three planetary gears 41b,
41b, 41b are engaged.

A driven side gear 55 is provided on the outer periphery of the internal gear 41c, and a driven side gear 80 of a drive control unit 43, which will be described later, is meshed with the driven side gear 55.

When the planetary gears 40b, 40b, 40b of the first planetary gear mechanism 40 revolve along with the rotation of the rotary main shaft 2, the planetary gears 41 arranged coaxially with them.
The b, 41b, 41b are also guided by the internal gear 41c and rotate while revolving, and the rotational force causes the sun gear 41a to rotate around the main spindle 2.

Further, even if the internal gear 41c rotates in accordance with the rotation of the drive side gear 80 of the drive control unit 43, the planetary gears 41b, 41b, 41b rotate while revolving, and the sun gear similar to the above. 41a will be rotated around the main rotating shaft 2.

In the illustrated embodiment, the sun gears 40a, 4a of the first and second planetary gear mechanisms 40, 41 are provided.
1a, planetary gears 40b, 41b and internal gears 40c, 4
1c has the same module and the same number of teeth, so that when the drive control unit 43 stops driving, the rotation speed of the sun gear 40a of the first planetary gear mechanism 40 and the second planetary gear mechanism 1c. The sun gear 41a of 41 is configured to have the same rotation speed (described later).

The screw mechanism 42 is the second planetary gear mechanism 41.
Is provided between the inner peripheral portion of the sun gear 41a of the second planetary gear mechanism 41 and the outer peripheral portion of the rotating main shaft 2, and is composed of a drive female screw member 42a and a driven male screw member 42b. .

As described above, the driving female screw member 42a is integrally provided on the inner peripheral portion of the lower cylindrical portion 60 of the sun gear 41a of the second planetary gear mechanism 41.

Further, the driven male screw member 42b, which is screwed so as to be able to advance and retract, is formed in a cylindrical shape and is provided on the outer peripheral portion of the rotary main shaft 2 so as to be slidable in the vertical direction (axial direction), and the rotation thereof is performed. It is integrally connected to the cutting shaft 30 arranged in the main shaft 2.

That is, at the upper end 30b of the cutting shaft 30,
The connecting pin 70 is mounted horizontally, and both ends of the connecting pin 70 are projected to the outside of the rotary main shaft 2 through axial elongated holes 71, 71 opened in the rotary main shaft 2, and It is fixed to the driven male screw member 42b.

When the driving female screw member 42a rotates relative to the rotating main shaft 2, the driven male screw member 42b screwed to the driving female screw member 42a moves forward and backward to rotate the rotating main shaft 2.
It slides up and down, whereby the cutting shaft 30 performs a cutting operation.

The drive control unit 43 includes the second planetary gear mechanism 4
The drive side gear 80, which drives the first drive gear 1, is meshed with the driven side gear 55 on the outer circumference of the inner gear 41c of the second planetary gear mechanism 41, and the cutting motor 81 that rotationally drives the drive side gear 80. Be prepared.

The drive side gear 80 is formed integrally with the rotation transmission shaft 82, and the rotation transmission shaft 82 is rotatably provided on the slide body 15 via bearings 83, 83 in a vertical direction. The rotation transmission shaft 82 has a hollow cylindrical shape, and the cut drive shaft 85 is inserted into the shaft hole 82a.

The notch drive shaft 85 includes bearings 86, 86.
Is rotatably supported by the machine body 25 coaxially with the rotation transmission shaft 82, and the upper portion thereof is supported by the rotation transmission shaft 8
The second shaft hole 82a is key-fitted or spline-fitted (key-fitted in the illustrated embodiment) 87. This allows
The rotation transmitting shaft 82 is connected to the notch driving shaft 85 so as to be relatively movable in the vertical direction (axial direction) and integrally rotatable.

The upper end 85a of the cutting drive shaft 85 is coaxially connected to the motor shaft 81a of the cutting motor 81 via a coupling 88. The cutting motor 81 is
It is attached to the machine body 25 downward via a mounting bracket (not shown). A servo motor or a stepping motor is preferably used as the cutting motor 81,
A stepping motor is used in the illustrated embodiment.

When the cutting motor 81 is rotationally driven, the second planetary gear mechanism 41 is rotationally driven via the cutting drive shaft 85, the rotation transmission shaft 82 and the drive gear 80. Thus, the screw mechanism 42 is also driven to rotate, so that the cutting shaft 30 is moved downward or upward relative to the rotary main shaft 2. In other words, regardless of whether the main spindle 2 is rotating, when the cutting motor 81 is not driven, the screw mechanism 42 is in the cutting operation stopped state, while the cutting motor 81 is not cutting. When the screw 81 is driven to rotate, the screw mechanism 42 performs the grindstone cutting operation or the grindstone returning operation.

Specifically, the driven male screw member 42 screwed into the driving female screw member 42a of the screw mechanism 42 so as to be able to advance and retract.
As described above, b is moved downward or upward relative to the rotary main shaft 2. In other words, when the driven male screw member 42b is moved downward, the cutting shaft 30 integrated with the driven male screw member 42b pushes the cone rod 11 downward, and the grindstones 10, 10,... Are expanded (grinding stone cutting operation). On the other hand, when the driven male screw member 42b moves upward, the grindstone 10 is moved by the return spring (not shown) in the honing tool 1 as the cutting shaft 30 moves upward.
Is closed and closed (grinding stone returning operation).

This point will be described in detail below, particularly focusing on the actions of the first and second planetary gear mechanisms 40 and 41.

That is, as described above, the sun gears 40a, 41 of the first and second planetary gear mechanisms 40, 41
a, planetary gears 40b, 41b and internal gears 40c, 41
Since each of c has the same module and the same number of teeth, it can be theoretically divided into the following two operations.

A. The cutting motor 81 rotates when the drive stops.
When the main shaft 2 is driven to rotate: Table 1 shows the movement of each component of the grindstone cutting device 5 in this case.

[0061]

[Table 1]

That is, when the rotating main shaft 2 rotates, the sun gear 40a rotates and the planetary gears 40b, 40b, 40b
Since the internal gear 40c is fixed while rotating, the planetary gears 40b, 40b, 40b revolve around the rotation main shaft 2 according to the rotation.

At this time, the same support shaft 4 as each planetary gear 40b is used.
The planetary gears 41b arranged in 6 are the internal gears 41c.
Since it is stopped, the sun gear 41a rotates in accordance with its revolution, that is, the same rotation as the planetary gear 40b, and the sun gear 41a rotates in the same rotation as the sun gear 40a with this rotation.

Therefore, the gears of the first and second planetary gear mechanisms 40 and 41 operate as if they were integral with each other, and the rotary main shaft 2, that is, the driven male screw member 4 is rotated.
2b and a sun gear 41a, that is, a driving female screw member 42a.
No relative rotation with respect to is performed, and the grindstone cutting operation or the returning operation by the screw mechanism 42 is not performed.

B. When the cutting motor 81 is driven to rotate,
Table 2 shows the movement of each component of the grindstone cutting device 5 when the driving spindle 2 is stopped .

[0066]

[Table 2]

That is, the drive of the first planetary gear mechanism 40 is stopped, the carrier 47 (the support shaft 46 of the planetary gear) is also stopped and fixed, and the drive side gear 80 by the cutting motor 81.
Rotation of the internal gear 41c, planetary gears 41b, 41b, 4
1b and the sun gear 41a, the rotation main shaft 2, that is, the driven male screw member 42b, and the sun gear 41a, that is, the drive female screw member 42a are relatively rotated, and the grinding mechanism cutting operation or the returning operation by the screw mechanism 42 is performed. This is performed according to the rotation of the cutting motor 81.

In other words, in the actual operation based on the above two theoretical operations, the rotary spindle 2 is constantly rotating during the honing process, while the cutting motor 81 is used.
Rotates by a preset timing, speed, and amount. When the cutting motor 81 is stopped, the drive female screw member 42a is driven by the driven male screw member 42b.
It rotates together with and does not perform the grinding stone cutting operation or the returning operation.

When the drive side gear 80 is rotated by the rotational driving of the cutting motor 81, the internal gear 41c is rotated, and the rotation difference between each planet gear 41b and each planet gear 40b is generated by the rotation amount. Then, the sun gear 41a rotates more (or less) than the sun gear 40a by the rotation difference between the two planetary gears 40b and 41b, and the screw mechanism 42 is rotationally driven to perform the above-described grinding wheel cutting operation or return operation.

After all, the driving female screw member 42 of the screw mechanism 42
a rotates relative to the driven male screw member 42b regardless of the rotation of the rotary spindle 2.
Only when 1 rotates.

The control section 6 automatically controls the operation of each drive section of the honing machine in conjunction with each other.
It is composed of a microcomputer including a CPU, a ROM, a RAM and an I / O port.

The control section 6 includes a spindle drive motor 17 of the spindle rotation drive section 3 and a hydraulic cylinder 1 of the spindle reciprocating drive section 4.
8. The cutting motor 81 of the grindstone cutting device 5 and other drive units are electrically connected.

In addition, the control unit 6 includes drive units 3,
Various information necessary for driving the 4,5, for example, the rotation speed of the honing tool 1, the lifting speed and the operation timing,
Alternatively, the reference position, cutting speed, cutting timing, etc. of the grindstones 10, 10, ... Are set as NC (numerical control) data in advance or selectively.

Therefore, in the honing machine configured as described above, each of the driving units 3, 4, and 5 has the control unit 6
Are automatically controlled in relation to each other as described below.

First, by the spindle reciprocating drive unit 4, the grindstones 10, 10, ... Of the honing tool 1 are located at the lowermost position of machining with respect to the work surface Wa of the work W (two-dot chain line position in FIG. 3).
Then, the honing tool 1 is given a rotary motion by the main shaft rotary drive unit 3.

Subsequently, while the rotary motion and the reciprocating motion (elevating stroke S) are given to the honing tool 1 by the spindle rotary drive unit 3 and the spindle reciprocating drive unit 4, the grindstone cutting operation of the grindstone cutting device 5 causes the grindstone to move. 10,1
A certain cut (expansion) is given to 0,..., And the entire processing area of the processing surface Wa is honed.

When the honing processing with the set cutting depth is completed, the grindstones 10, 10, ... Are closed and closed by the grindstone returning operation of the grindstone cutting device 5, and then the honing tool 1 is raised again to the initial position. Is restored.

In this case, since the screw mechanism 42 is arranged coaxially with the cutting shaft 30, even when the reaction force from the work W acts on the grindstones 10, 10, ... When the grindstone is expanded, There is no backlash due to bending or uneven wear at the connecting portion between the screw mechanism 42 and the cutting shaft 30, the transmission efficiency of this portion is good, and high grinding stone expansion accuracy is secured.

It should be noted that the above-mentioned embodiment is merely for showing a preferred concrete example of the present invention, and the present invention is not limited to this, and various design changes can be made within the scope thereof. , Each component of the honing machine 3,
4, 5, 6 and the like may have other configurations as long as they have the same function.

Further, the specific configuration of the grinding wheel cutting device 5 is as follows.
Other configurations other than those shown can be adopted as long as they have the same functions and actions as those of the shown embodiment.

[0081]

As described above in detail, according to the grindstone cutting device of the present invention, the cutting drive means is the first planetary gear mechanism drivingly connected to the rotating main shaft, and the first planetary gear mechanism. A second planetary gear mechanism drivingly connected to the second planetary gear mechanism, a screw mechanism drivingly connecting the second planetary gear mechanism and the cutting shaft, and drive control means for driving the second planetary gear mechanism. When the driving of the drive control unit is stopped, the screw mechanism is in a cutting operation stopped state, and the rotation of the drive control unit causes the screw mechanism to perform a cutting operation. The grinding wheel cutting operation can be performed accurately.

That is, since the screw mechanism is arranged coaxially with the cutting shaft, the screw mechanism and the cutting shaft are connected even when the reaction force from the workpiece acts on the grinding stone when the grindstone is expanded. There is no backlash due to bending or uneven wear in the portion, the transmission accuracy and transmission efficiency of this portion are good, and high grinding stone extension accuracy is secured.

Further, in the honing machine equipped with this grindstone cutting device, in addition to the above-mentioned unique effects, automatic control in synchronization with other main constituent devices is possible, and automatic honing processing for mass-produced products is highly efficient. Can be realized.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a main part configuration of a honing machine according to a first embodiment of the present invention.

FIG. 2 is an enlarged front sectional view showing a grindstone cutting device in the honing machine.

FIG. 3 is a sectional view showing a honing tool of the honing machine in relation to a work surface of a work.

FIG. 4 is a cross-sectional view of the first planetary gear mechanism 40 of the honing machine, taken along line IV-IV of FIG.

FIG. 5 is a sectional view taken along line VV in FIG. 2 showing a second planetary gear mechanism 41 of the honing machine.

FIG. 6 is a front view showing a grinding wheel cutting device in a conventional honing machine in a partial cross section.

FIG. 7 is an enlarged front view of a part of a conventional grindstone cutting device.

[Explanation of symbols]

 W Workpiece (workpiece) Wa Workpiece surface 1 Honing tool 2 Rotating spindle 3 Spindle rotation drive unit (spindle rotation means) 4 Spindle reciprocation drive unit (spindle reciprocation means) 5 Grinding wheel drive unit (grinding wheel cutting device) 6 Control unit (Control means) 10 Grinding stone 11 Cone rod (grinding stone expanding member) 11a Tapered cone 15 Slide main body (apparatus main body) 17 Spindle drive motor 18 Hydraulic cylinder (vertical cylinder) 25 Body 26 Guide rod 30 Cutting shaft 31 Cutting drive unit (Incision Driving Means) 40 First Planetary Gear Mechanism 40a Sun Gear 40b Planetary Gear 40c Internal Gear 41 Second Planetary Gear Mechanism 41a Sun Gear 41b Planetary Gear 41c Internal Gear 42 Screw Mechanism 42a Drive Female Screw Member 42b Driven Male Screw Member 43 Drive Control unit (drive control means) 46 Support shaft 47 Carrier 55 Driven side Car 80 drive-side gear 81 cutting motor 82 rotates transmission shaft 85 cut drive shaft

Claims (10)

(57) [Claims] 1. A grindstone is forcibly cut during honing.
It is installed in the honing machine of the forced cutting method
There are a cutting shaft which is movable in the rotational main shaft to the axial direction, a notch drive means for moving the cutting axis in the axial direction, provided in the honing tool, the axis of the cutting shaft A whetstone expanding member for expanding the whetstone by moving in a direction, wherein the cutting drive means is connected to the first planetary gear mechanism which is drivingly connected to the rotating main shaft, and is drivingly connected to the first planetary gear mechanism. A second planetary gear mechanism, a screw mechanism for drivingly connecting the second planetary gear mechanism and the cutting shaft, and a second planetary gear mechanism.
Drive control means for driving the planetary gear mechanism, wherein the screw mechanism is disposed coaxially with the cutting shaft.
The cut is made by the screw forward / backward movement due to its rotational drive.
Is a structure that the shaft is moved to the axial direction, the screw mechanism upon driving stop of the drive control means
There threadably advancing and retracting operation is stopped, the screw mechanism grindstone depth cutting apparatus, wherein a is configured to operate screw forward and backward by rotation of said drive control means. 2. The first planetary gear mechanism is rotatably supported by a carrier via a spindle and coaxially and integrally attached to a rotating main shaft, and meshes with the sun gear. The grindstone cutting device according to claim 1, further comprising: a planetary gear that rotates, and an internal gear that is fixed to the device body and that meshes with the planetary gear. 3. The second planetary gear mechanism includes: an internal gear rotatably supported; a planetary gear rotatably supported by a carrier via a support shaft to mesh with the internal gear; and a rotating main shaft. The grindstone cutting device according to claim 1, further comprising: a sun gear that is coaxially and rotatably supported by the sun gear and that meshes with the planetary gear. 4. The planetary gear of the first planetary gear mechanism and the planetary gear of the second planetary gear mechanism are coaxially and rotatably supported on the support shaft of the carrier. Whetstone cutting device. 5. A driven gear is provided on the outer periphery of an internal gear of the second planetary gear mechanism, and a driven gear of the drive control means is meshed with the driven gear, and a sun gear of the second planetary gear mechanism is provided. The screw mechanism is provided between an inner peripheral portion of the shaft and an outer peripheral portion of the rotary spindle.
The grindstone cutting device described in. 6. A driven male screw member provided on an outer peripheral portion of the rotary main shaft so as to be movable in the axial direction thereof and integrally connected to the notch shaft, and a second planetary gear mechanism. The grinding wheel cutting device according to claim 1, further comprising a drive female screw member integrally provided on an inner peripheral portion of the sun gear and screwably engaged with the driven male screw member. 7. The drive control means includes: a drive-side gear meshing with a driven-side gear provided on an outer periphery of an internal gear of a second planetary gear mechanism; a cutting motor for rotating the drive-side gear; The grindstone cutting device according to claim 3, further comprising: 8. The sun gear, the planetary gear and the internal gear of the first and second planetary gear mechanisms have the same module and the same number of teeth, and thereby have the rotational speed of the sun gear of the first planetary gear mechanism. 5. The grindstone cutting device according to claim 3, wherein the rotational speeds of the sun gears of the second planetary gear mechanism and the second planetary gear mechanism are the same. 9. The grindstone cutting member according to claim 1, wherein the grindstone expanding member is in the form of a cone rod having a tapered cone at a tip portion thereof, and the whetstone is expanded by projecting or retracting the cone rod. apparatus. 10. A grindstone is forcibly cut during honing.
This is a honing machine with a forced cutting method that allows it to reciprocate in the axial direction of the surface of the workpiece to be machined, and has a rotating spindle that is rotatably supported around the axis and the rotating spindle. Main spindle rotating means for rotating and rotating, main spindle reciprocating means for reciprocating the rotary spindle in the axial direction of the surface to be machined, and a grindstone attached to the tip of the rotary spindle and having a grindstone surface along the surface to be machined A honing machine comprising: a honing tool provided in the above; and a grindstone cutting device according to any one of claims 1 to 9 for performing a cutting operation of a grindstone of the honing tool.