JP3537013B2 - Method and apparatus for supplying coolant to gear cutting 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 method and an apparatus for supplying a coolant to a cutting portion moving in a gear cutting machine, and more particularly to a method and a supply of a coolant used for a gear cutting machine for performing gear cutting of a hypoid gear. It concerns the device.

[0002]

2. Description of the Related Art In the above-described tooth cutting machine, coolant is supplied to a cutting portion during machining for the purpose of reducing heat generation caused by machining, quickly removing chips, extending tool life, and the like. A high-pressure coolant device is used for the supply.

[0003] In a gear cutting machine for performing gear cutting of a hypoid gear, a cutter provided with an annular cutting blade is offset from a rotating cradle, and the cutter is rotated and revolved by the cradle to create one tooth at a time. Therefore, the cut portion moves during the processing. For this reason, in the same tooth cutting machine, a plurality of coolant supply nozzles with different target positions are arranged in the process of moving the cutting portion, and further,
In order to make effective use of the momentum of the coolant discharge, the nozzles are brought as close as possible to the cutting location, and the coolant is supplied from all the nozzles to the cutting location simultaneously.

[0004]

However, in the conventional coolant supply as described above, the coolant is supplied from a plurality of nozzles at the same time. There is a problem that the degree of freedom of setting is small and it is difficult to increase the reliability of coolant supply to the cutting part.Moreover, a large amount of coolant is required and a large pump is required for the coolant supply source. There was a problem, and solving such a problem was an issue.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and can improve the reliability of coolant supply to a cutting portion, reduce the amount of coolant discharged, and reduce the coolant supply source. It is an object of the present invention to provide a method and an apparatus for supplying coolant to a gear cutting machine that can be downsized.

[0006]

According to a first aspect of the present invention, there is provided a method for supplying coolant to a gear cutting machine which supplies a coolant to a cutting portion moving on the gear cutting machine according to a movement locus of the cutting portion. Using a coolant supply nozzle provided at a plurality of positions, switching the coolant discharge position by interrupting the flow of coolant to each nozzle as the cutting position moves, and switching the coolant discharge position before switching And the coolant discharge time in both nozzles after the switching is overlapped for a certain period of time, and the above-mentioned configuration is used as means for solving the problem.

According to a second aspect of the present invention, there is provided an apparatus for supplying coolant to a cutting machine which moves on a gear cutting machine. A nozzle for supplying coolant, a switching mechanism between each nozzle and the coolant supply source for interrupting the flow of coolant to each nozzle, and the switching mechanism is a rotary valve having a rotating body in a cylinder. In addition, the rotary valve includes, in the cylinder, an inflow portion communicating with the coolant supply source, and an outflow portion to each nozzle provided at predetermined intervals along the circumference of the cylinder,
The rotating body is provided with a circulation part having one end communicating with the inflow part and the other end communicating with each outflow part according to the rotation position, and two outflow parts adjacent to the outflow part side of the circulation part provided in the rotating body. In the coolant supply device for a gear cutting machine according to claim 2, the outlet passage portion that enables communication with the rotary gear is provided between the driving system of the gear cutting machine and the rotating body of the rotary valve. The rotating body is rotationally driven by a valve drive gear mechanism provided. Claim 4 is a device for supplying a coolant to a cutting portion moving on a gear cutting machine, wherein a plurality of positions corresponding to a movement locus of the cutting portion are provided. , Equipped with coolant supply nozzles, between each nozzle and coolant supply source,
A switching mechanism for interrupting the flow of coolant to each nozzle is provided. The switching mechanism is a solenoid valve provided in a flow path to each nozzle, a valve controller for opening and closing each solenoid valve, and a drive system for the gear cutting machine. And a proximity switch that detects a notch provided in the dog, and operates a valve controller based on a signal from the proximity switch. I have.

[0008]

According to the coolant supply method for the gear cutting machine according to the first aspect of the present invention, the discharge of the coolant is switched by interrupting the flow of the coolant to each nozzle as the cutting position moves. Coolant is prevented from intersecting with each other, the reliability of coolant supply to the cutting location is improved, and the amount of coolant discharged can be minimized as compared to the case where coolant is discharged from multiple positions at the same time. It becomes. In addition, when the coolant discharge position is switched, the coolant discharge time of both the nozzles before and after the switch is overlapped for a certain time, so that the coolant is supplied to the cut portion without interruption.

[0009]

In the coolant supplying apparatus for a gear cutting machine according to the second aspect of the present invention, the coolant is supplied from the selected nozzle in accordance with the movement of the cutting portion, so that the discharged coolant does not intersect with each other. The degree of freedom in setting the nozzles is increased, thereby increasing the reliability of coolant supply to the cutting location, and also making it possible to minimize the amount of coolant discharged as compared to the case where coolant is discharged from multiple nozzles simultaneously. It will be. Further, the flow of the coolant to each nozzle is interrupted by a simple structure by the rotary valve which is a switching mechanism. In addition, when the flow of the coolant is switched due to the rotation of the rotary valve, two adjacent outflows are generated. The part is in a communicating state for a certain period of time, so that the coolant discharge times of both nozzles before and after the switching overlap for a certain period of time, so that the coolant is supplied to the cut portion without interruption.

In the coolant supplying apparatus for a gear cutting machine according to a third aspect of the present invention, the drive system of the gear cutting machine serves as a rotation drive source of a rotary member of a rotary valve, and moves a cutting position and distributes coolant to each nozzle. Synchronization with switching is achieved.

[0012]

[0013] In the coolant supply device for a gear cutting machine according to claim 4 of the present invention, the coolant is supplied from the selected nozzle in accordance with the movement of the cutting portion, so that the discharged coolant does not cross each other, The degree of freedom in setting the nozzles is increased, thereby increasing the reliability of coolant supply to the cutting location, and also making it possible to minimize the amount of coolant discharged as compared to the case where coolant is discharged from multiple nozzles simultaneously. It will be. In addition, the solenoid valve and the valve controller, which are switching mechanisms, allow the coolant to flow through each nozzle to be intermittently and accurately controlled by electrical control. By detecting the notch provided in the proximity switch with the proximity switch and operating the valve controller based on the signal from the proximity switch, the synchronization between the movement of the cutting position and the switching of coolant flow to each nozzle can be more accurately achieved. Will be done.

[0014]

According to the coolant supply method for the gear cutting machine according to the first aspect of the present invention, the flow of the coolant to the nozzles is intermittently switched with the movement of the cutting position, thereby switching the coolant discharge position. In addition, since the discharged coolants do not intersect with each other, the degree of freedom in setting the coolant discharge direction is increased, and the reliability of the coolant supply to the cutting location can be increased. Also, compared to the conventional case where the coolant is simultaneously discharged from a plurality of positions, the coolant discharge amount can be minimized, and the coolant discharge amount can be greatly reduced. The size of the pump can be reduced, which can contribute to downsizing of the entire device used for supplying the coolant and energy saving.

Further, according to the method of supplying coolant for the gear cutting machine according to the first aspect of the present invention, the coolant can be supplied to the cutting portion without interruption, thereby cooling the cutting portion, removing chips, and removing the chips. The function of the coolant, such as extending the life of the tool, can be favorably maintained.

According to the coolant supplying apparatus for a gear cutting machine according to the second aspect of the present invention, since the coolant is supplied from the nozzle selected in accordance with the movement of the cutting portion, the discharged coolants intersect. Is eliminated, the degree of freedom in setting the nozzle is increased, and the reliability of supplying the coolant to the cut portion can be improved. Also, compared to the conventional case where the coolant is simultaneously discharged from a plurality of nozzles, the amount of the discharged coolant can be minimized, and the amount of the discharged coolant can be greatly reduced. The size of the pump can be reduced, and the size of the entire device used for supplying the coolant can be reduced, and energy can be saved.

Further, according to the coolant supplying apparatus for a gear cutting machine according to the second aspect of the present invention, the rotary valve serving as a switching mechanism is employed, so that the flow of the coolant to each nozzle can be reliably switched on and off with a simple structure. It is also possible to further simplify the structure of the entire device, and also, when switching the flow of the coolant, the discharge time of the coolant in both nozzles before and after the switching is overlapped for a certain period of time. In addition, the coolant can be supplied to the cutting portion without interruption, and the coolant function such as cooling the cutting portion, removing chips, and extending the life of the tool can be favorably maintained.

According to the coolant supplying apparatus for a gear cutting machine according to the third aspect of the present invention, the same effects as those of the second aspect are obtained, in addition to the movement of the cutting position and the switching of the flow of the coolant to each nozzle. Can be accurately synchronized with each other, and the reliability of the coolant supply to the cutting location can be further improved.

[0019]

According to the coolant supply device for the gear cutting machine according to the fourth aspect of the present invention, the coolant is supplied from the selected nozzle along with the movement of the cutting portion, so that the discharged coolants intersect. Is eliminated, the degree of freedom in setting the nozzle is increased, and the reliability of supplying the coolant to the cut portion can be improved. Also, compared to the conventional case where the coolant is simultaneously discharged from a plurality of nozzles, the amount of the discharged coolant can be minimized, and the amount of the discharged coolant can be greatly reduced. The size of the pump can be reduced, and the size of the entire device used for supplying the coolant can be reduced, and energy can be saved. Furthermore, by adopting a solenoid valve and a valve controller as a switching mechanism,
The intermittent flow of coolant to each nozzle can be accurately controlled by electrical control, and furthermore, the discharge time when switching the coolant discharge position in order to supply the coolant without interruption to the cutting point Can be very easily dealt with.

Further, according to the coolant supplying apparatus for a gear cutting machine according to the fourth aspect of the present invention, the valve controller is controlled based on a signal from a proximity switch which detects a notch of a dog rotating by a driving system of the gear cutting machine. , The movement of the cutting position and the switching of the coolant flow to each nozzle can be more accurately synchronized, and the reliability of coolant supply to the cutting location can be further improved.

[0022]

1 to 4 show an embodiment of a coolant supply method for a gear cutting machine according to the first aspect of the present invention and a coolant supply apparatus for a gear cutting machine according to the second and third aspects of the present invention. It is.

The gear cutting machine shown in FIGS. 2 and 3 is for performing gear cutting of a hypoid gear.
The cradle 2 is rotatably provided and the cradle 2
In addition, a cutter 4 having a plurality of cutting blades 3 arranged in an annular shape is rotatably provided. The cutter 4 is in a state where its rotation axis C1 is offset with respect to the rotation axis C2 of the cradle 2. Further, on the bed 5, there is provided a table 6 which is driven forward and backward with respect to the headstock 1.
On the upper side, there is provided a swivel 7 which rotates about a vertical axis C3 near the headstock 1, and the swivel 7 has a gear material W
Is provided so as to be able to move up and down.

As shown in FIG. 1, the drive system of the gear cutting machine is connected to a motor 9, a transmission gear mechanism 11 for transmitting the rotation of the motor 9 to the cutter 4 and a feed gear mechanism 10, and a feed gear mechanism 10. An indexing mechanism 12, a cradle drive shaft 13 connected to the indexing mechanism 12, and a work holder drive shaft 15 connected to the indexing mechanism 12 via a reversing gear mechanism 14. A reversing mechanism 16 and a second speed change gear mechanism 17 are provided between the feed gear mechanism 10 and the cradle drive shaft 13, and a third speed change gear mechanism 18 is provided between the cradle drive shaft 13. , And an index gear mechanism 19 is provided on the work holder drive shaft 15 in the work holder 8.

The above-mentioned gear cutting machine is revolved by rotating the cradle 2 while rotating the cutter 4, and by synchronizing the rotation of the work holder 8 with this movement, the gear cutting W is held on the gear blank W held by the work holder 8. Is created one by one. At this time, in the gear cutting machine, during processing of one tooth, FIG.
The cut portion moves from the small-diameter side D1 to the large-diameter side D2 of the gear blank W shown in FIG.

In view of the above, the coolant supply device for the gear cutting machine is provided with a plurality of positions (4 in FIG.
At a location), a switching mechanism for interrupting the flow of coolant to each of the nozzles N1 to N4 between the nozzles N1 to N4 and the coolant supply source (high-pressure coolant device) 20. The rotary valve 21 is provided. Coolant supply source 20
Is equipped with a coolant tank 20b and a pump 20a for pressurized feeding.

As shown in FIG. 4, the rotary valve 21 includes a rotating body 23 inside a cylindrical body 22.
An inflow portion 22a communicating with the coolant supply source 20;
In addition to four outflow portions 22b to 22e provided at 90-degree intervals in the circumferential direction (along the circumference), the rotating body 23
A flow portion 23 having one end communicating with the inflow portion 22a and the other end individually communicating with each of the outflow portions 22b to 22e according to the rotational position.
a. In addition, as shown in FIG.
Is connected to a pipe 24a from the pump 20a of the coolant supply source 20, and each of the outlets 22b to 22e is connected to a pipe 24b to 24e to each of the nozzles N1 to N4.

The inflow portion 22a has a groove 22f on the inner peripheral surface side of the cylindrical body 22 over the entire circumferential direction. The flow portion 23a is formed in a groove shape along the axial direction on the side surface of the rotating body 23, and has one end communicating with the groove 22f of the inflow portion 22a and the other end having two adjacent outflow portions. Outlet channel portion 23b that allows communication between the portions (22b to 22e)
Are formed along the circumferential direction.

Further, the rotary valve 21 is
A valve drive gear mechanism 25 is provided between the drive shaft 3 and the cradle drive shaft 13 in the drive system of the gear cutting machine, and is driven to rotate using the cradle drive shaft 13 as a rotation drive source.

Next, the coolant supply method of the present invention will be described together with the operation of the coolant supply device for a gear cutting machine having the above configuration.

When gear cutting is performed on the gear blank W in the gear cutting machine, the cutting position moves as described above.
The coolant supply device switches the discharge of the coolant from each of the nozzles N1 to N4 as the cutting position moves.

That is, the coolant is supplied to the pipe 24 a by the action of the pump 20 a in the coolant supply source 20.
Through the rotary valve 21. At the time of the start of cutting, for example, as shown in FIGS. 4A and 4B, the inflow portion 22a through the flow portion 23a of the rotating body 23
And one outflow portion 22b are in communication with each other, and the first nozzle N1 is connected via a pipe 24b connected to the outflow portion 22b.
Is supplying coolant to the cutting part.

Then, with the movement of the cutting portion, the rotation of the cradle drive shaft 13 is transmitted to the rotating body 23 via the valve drive gear mechanism 25, and as shown in FIG. When the clockwise rotation is performed, the circulation section 23a is brought into communication with the next outflow section 22c.

At this time, with the rotary valve 21 of the coolant supply device, the outflow side of the rotating body 23
Since the outlet flow path portion 23b that enables communication between the two adjacent outflow portions 22b and 22c is provided, the communication portion 23a and the two outflow portions 22b and 22c are in communication with each other for a certain period of time. 1st and 2nd nozzle N
The coolant is discharged from N1 and N2.

As described above, in the coolant supply device, when the flow of the coolant is switched, the discharge time of the coolant in the nozzles N1 and N2 before and after the switching is overlapped for a certain period, so that the coolant can be removed from the cut portion. To supply the coolant without interruption.

Then, from the state shown in FIG.
Is further rotated clockwise, the first outflow portion 22b is closed by the side surface of the rotating body 23, only the next outflow portion 22c is in communication with the flow portion 23a of the rotating body 23, and
Is discharged only from the nozzle N2. Thereafter, the rotating body 23 rotates with the movement of the cutting portion, and the flow of the coolant is sequentially switched to the third and fourth nozzles N3 and N4, and periodically as the teeth are formed in the gear material W sequentially. For each moving cutting point, each nozzle N1
Switching of coolant supply from N4 to N4 is repeatedly performed.

As described above, in the coolant supply device and the coolant supply method for the gear cutting machine described in the above embodiment,
By switching the nozzles N1 to N4 which are the discharge positions of the coolant in accordance with the movement of the cutting portion, the discharged coolants do not intersect with each other, and the reliability of the coolant supply to the cutting portion is improved. As compared with the case where the coolant is simultaneously discharged from a plurality of positions, the discharge amount of the coolant can be minimized. Therefore, even if the small pump 20a is used, it is possible to sufficiently cope with coolant supply.

The rotary valve 21 as a switching mechanism interrupts the flow of coolant to the nozzles N1 to N4 with a simple structure, and furthermore, connects the drive system (cradle drive shaft 13) of the gear cutting machine to the rotating body 23. Therefore, the movement of the cutting position and the switching of the flow of the coolant to the nozzles N1 to N4 are reliably synchronized.

FIGS. 5 and 6 are views for explaining an embodiment of a method for supplying coolant to a gear cutting machine according to the first aspect of the present invention and a coolant supply apparatus for a gear cutting machine according to a fourth aspect of the present invention. The same components as those in the previous embodiment are denoted by the same reference numerals, and detailed description is omitted.

The coolant supply device for a gear cutting machine shown in FIG. 5A includes nozzles N1 to N4 for supplying coolant at a plurality of positions (four in the drawing) corresponding to the movement trajectory of the cutting portion. A switching mechanism is provided between each of the nozzles N1 to N4 and the coolant supply source 20 so as to interrupt the flow of the coolant to each of the nozzles N1 to N4. Solenoid valves 30a to 30d provided on the road, and a valve controller 3 for opening and closing each of the solenoid valves 30a to 30d
1 is provided.

In each of the solenoid valves 30a to 30d, a branch of a pipe 24a from the pump 20a is connected to the inflow side, and pipes 24b to 24e to each of the nozzles N1 to N4 are connected to the outflow side. In addition, wirings 32a to 32d to the valve controller 31 are connected to a drive input unit.

The switching mechanism includes a dog 33 on the cradle drive shaft 13 which is a driving system of the gear cutting machine, a proximity switch 34 for detecting the dog 33, and a valve control of the proximity switch 34 by a wiring 32e. By connecting to the device 31, the valve controller 31 is operated based on a signal from the proximity switch 34.

The dog 33 is, as shown in FIG.
It has a disk shape with notches 33a to 33d provided at 90 degree intervals. The proximity switch 34 is provided at a position facing the outer peripheral surface of the dog 33, generates an ON signal when detecting the cutouts 33a to 33d, and turns OFF when the cutouts 33a to 33d are detected.

In the above-described coolant supply device for the gear cutting machine,
When the dog 33 rotates together with the cradle drive shaft 13 in accordance with the movement of the cutting position, and the first notch 33a is detected by the proximity switch 34 as shown in FIG. 5B, the valve controller 31 is turned on as shown in FIG. , The first solenoid valve 30a is opened (ON) by the ON signal of the proximity switch 34. At this time, the second to fourth solenoid valves 30b to 30d are closed (OFF). Therefore, the coolant from the coolant supply source 20 is supplied to the cutting location from the first nozzle N1 via the first solenoid valve 30a.

When the cutting position further moves, the next notch 33b in the dog 33 is detected by the proximity switch 34, and the second solenoid valve 30b is opened. At this time, in the valve controller 31 of the coolant supply device, as shown in FIG. 6, the first solenoid valve 30a is opened when the second solenoid valve 30b is opened.
Is left open, and after a certain time T has elapsed, the first
Is controlled so as to close the solenoid valve 30a, and when the flow of the coolant is switched in this manner, the discharge time of the coolant in the nozzles N1 and N2 before and after the switching is overlapped for a certain period of time. In addition, the coolant is supplied to the cutting portion without interruption.

Thereafter, in the coolant supply device, the dog 33 rotates with the movement of the cutting position, and as shown in FIG. 6, the third and fourth solenoid valves 30c, 30d
Are sequentially opened and closed, and the flow of the coolant is sequentially switched to the third and fourth nozzles N3 and N4. Switching of the coolant supply from N1 to N4 is repeatedly performed.

As described above, in the coolant supply device and the coolant supply method for the gear cutting machine described in the above embodiment,
The same effects as in the previous embodiment can be obtained. In particular, the intermittent coolant flow to and from the nozzles N1 to N4 can be accurately controlled by the solenoid valves 30a to 30d and the valve controller 31, which are switching mechanisms. In addition, the notch 33 of the dog 33 that uses the drive system (cradle drive shaft 13) of the gear cutting machine as a rotational drive source.
a to 33d are detected by the proximity switch 34, and the valve controller 31 is operated based on a signal from the proximity switch 34, so that the cutting position is moved and the nozzles N1 to N
4 is more accurately synchronized with the switching of the flow of the coolant.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an embodiment of a coolant supply device for a gear cutting machine according to claims 2 and 3 of the present invention.

FIG. 2 is a perspective view illustrating a gear cutting machine.

3A and 3B are an enlarged perspective view of a cutting portion of the gear cutting machine and a side sectional view of a gear material.

FIG. 4 is a longitudinal sectional view (a) illustrating a rotary valve;
It is a cross-sectional view (b) near the outflow section and a cross-sectional view (c) showing a state in which the circulation section and the two outflow sections are communicated with the rotation of the rotating body.

FIG. 5 is a schematic explanatory view showing one embodiment of a coolant supply device for a gear cutting machine according to claim 4 of the present invention.

FIG. 6 is a timing chart illustrating control of each solenoid valve based on a signal of a proximity switch as control in the valve controller.

[Explanation of symbols]

N1 to N4 Nozzle 13 Cradle drive shaft (drive system of gear cutting machine) 20 Coolant supply source 21 Rotary valve (switching mechanism) 22 Cylindrical body 22a Inflow sections 22b to 22e Outflow section 23 Rotating body 23a Distribution section 23b Exit flow path section 25 Valve drive gear mechanism 30a to 30d Solenoid valve (switching mechanism) 31 Valve controller (switching mechanism) 33 Dog 33a to 33d Notch 34 Proximity switch

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B23F 1/00-23/12 B23Q 11/10

Claims (4)

(57) [Claims] When supplying coolant to a cutting portion that moves in a gear cutting machine, a coolant supply nozzle provided at a plurality of positions corresponding to the movement locus of the cutting portion is used,
In addition to switching the coolant discharge position by interrupting the flow of coolant to each nozzle with the movement of the cutting position, when switching the coolant discharge position, the coolant discharge time of both nozzles before and after switching is constant. A coolant supply method for a gear cutting machine, wherein the coolant is overlapped between the two. 2. An apparatus for supplying a coolant to a cutting portion moving on a gear cutting machine, comprising: a plurality of nozzles for supplying a coolant at a plurality of positions corresponding to a movement locus of the cutting portion; In between, a switching mechanism for interrupting the flow of coolant to each nozzle is provided, and the switching mechanism is a rotary valve having a rotating body in the cylinder, and the rotary valve communicates with the cylinder and a coolant supply source. An inflow portion and an outflow portion to each nozzle provided at predetermined intervals along the circumference of the cylindrical body, and one end of the rotating body communicates with the inflow portion, and the other end has an outflow portion corresponding to the rotation position. Characterized in that an outlet channel portion is provided on the outflow portion side of the circulation portion provided on the rotating body so as to allow two adjacent outflow portions to communicate with each other. apparatus. 3. The gear supplying machine according to claim 2, wherein the rotary body is rotationally driven by a valve driving gear mechanism provided between a driving system of the gear cutting machine and a rotary body of the rotary valve. Characteristic coolant supply device for gear cutting machine. 4. An apparatus for supplying coolant to a cutting portion moving on a gear cutting machine, comprising: a plurality of nozzles for supplying coolant at a plurality of positions corresponding to a movement locus of the cutting portion; A switching mechanism for interrupting the flow of coolant to and from each nozzle, the switching mechanism comprising a solenoid valve provided in a flow path to each nozzle, a valve controller for opening and closing each solenoid valve, and a gear cutting machine. A dog rotating by a drive system of (1) and a proximity switch for detecting a notch provided in the dog, wherein a valve controller is operated based on a signal from the proximity switch.