JPH10337633A - Gang head for machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform speed-up of the rotation of a main shaft, raising of working precision, and prevention of coolant from penetrating into a head. SOLUTION: At least one nozzle for mist lubrication 43 is attached in each gear train in a head case 13 and mist lubricating oil is jetted against the gear train with high pressure air from the nozzle for mist lubrication 43. A bent hole for exhausting 53 is provided at the attaching part of a bearing member 49 which supports each gear shaft 47 in the gear train so that it can be rotated, and air current to flow out from the bent hole for exhausting 53 passes through the bearing member 49. Hence the lubrication of the bearing member 49 can be made by the mist lubricating oil included in the air current.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gang head used in various machine tools such as a transfer machine, and more particularly to lubrication and cooling of a rotation transmitting gear and a bearing in the gang head.

[0002]

2. Description of the Related Art A gang head has a rotary input shaft and a plurality of spindles rotatably supported by a head case (gear box), and the head for transmitting rotation of the rotary input shaft to each spindle. And a gear train provided for each spindle in the case.

In a conventional gang head, a gear train in a head case is lubricated in an oil bath manner by lubricating oil injected into the head case, and a gear shaft, a spindle, and a bearing of a rotary input shaft are lubricated. Lubrication is performed by sucking lubricating oil in the head case by an oil pump attached to the gang head and pumping the lubricating oil to each bearing through a lubricating oil passage or an external pipe formed in the head case.

[0004] Further, an oil seal member is provided at a portion where the spindle extends outside of the head case in order to prevent lubricating oil from flowing out of the bearing portion and coolant (cutting fluid) from entering the head case. An air curtain by air ejection is provided.

[0005]

Since the conventional gang head employs oil bath lubrication, the amount of heat generated by agitation of the lubricating oil increases as the rotational speed of the spindle increases, thereby increasing the rotational speed of the spindle. And the maximum temperature of the oil seal limits the speed of the main shaft.

[0006] Further, the spindle is thermally expanded due to an increase in the temperature of the oil seal or the lubricating oil, so that the processing accuracy is reduced.

In addition, the use of an oil seal causes the spindle to wear and a so-called slimming phenomenon occurs. Therefore, it becomes necessary to apply a ceramic coating to the spindle, which increases the cost.

Further, in order to feed the lubricating oil to each bearing part, a lubricating oil supply pipe and a lubricating oil recovery pipe must be provided in each bearing part, which greatly increases the number of pipes and complicated piping design. Become something. In addition, when the air curtain is provided, the number of pipes further increases, and the cost increases.

There is also a problem that a large amount of energy is consumed due to a large amount of oil agitation loss, oil pump power loss, oil seal friction loss, and air consumption by the air curtain.

In addition, maintenance such as periodic replacement of the lubricating oil and oil seal and checking of the amount of oil through the oil window becomes troublesome.

The present invention has been made in view of the above-mentioned problems, and the improvement of the lubrication method has resulted in a higher spindle speed, a higher processing accuracy, and a prevention of coolant liquid entering the head. , Eliminating the need for ceramic coating and reducing the number of piping, reducing costs and energy consumption,
It is an object of the present invention to provide a gang head for a machine tool capable of improving maintainability.

[0012]

According to a first aspect of the present invention, there is provided a gang head for a machine tool according to the first aspect of the present invention. A gang head for a machine tool having a spindle and a gear train provided for each spindle in the head case for transmitting the rotation of the rotary input shaft to each spindle. At least one nozzle is provided for each gear train, and the mist lubrication nozzle injects atomized lubricating oil toward the gear train together with high-pressure air.

In the gang head for a machine tool according to the present invention, mist lubricating oil is injected from the mist lubrication nozzle together with high-pressure air toward the gear train, and the gear train is mist-lubricated. This eliminates the heat generated by the stirring of the lubricating oil. Further, the internal pressure of the head case is increased by the mist injection, an air curtain effect is obtained, and the intrusion of the coolant liquid into the head case is prevented.

According to a second aspect of the present invention, in the gang head for a machine tool according to the first aspect, the bearing member rotatably supporting each gear shaft of the gear train is provided in the head case. The exhaust vent hole is provided in a mounting portion of the bearing member, and the airflow flowing out of the exhaust vent hole passes through the bearing member, and the mist-like lubricating oil contained in the airflow causes the airflow of the bearing member to be reduced. Lubrication is performed.

In the gang head for a machine tool according to the present invention, the air flow passes through the bearing member due to the outflow of the air flow from the exhaust vent hole, and no special piping is required due to the mist lubricating oil contained in the air flow. Lubrication of the bearing member is performed.

According to a third aspect of the present invention, in the gang head for a machine tool according to the first or second aspect, the spindle is sealed by a labyrinth seal member.

In the gang head for a machine tool according to the present invention, the spindle and the rotary input shaft are sealed by a labyrinth seal member in a non-contact manner.

According to a fourth aspect of the present invention, in the gang head for a machine tool according to the third aspect, the gap between the spindle and the spindle by the labyrinth seal member increases the internal pressure of the head case. This is a minute gap necessary for the above.

In the gang head for a machine tool according to the present invention, the internal pressure of the head case is increased because the seal clearance of the spindle by the labyrinth seal member is a minute clearance required to increase the internal pressure of the head case, and the air curtain effect is improved. Is reliably obtained, and intrusion of the coolant liquid into the head case is prevented.

According to a fifth aspect of the present invention, in the gang head for a machine tool according to the third or fourth aspect, a plurality of the labyrinth seal members are provided for each seal portion of the spindle. And
A drain port is provided between the labyrinth seal members.

In the gang head for a machine tool according to the present invention, the spindle is sealed by a plurality of (multi-stage) labyrinth seal members, and the coolant liquid penetrates through the first-stage labyrinth seal member, and the space between the labyrinth seal members is reduced. It flows out from the drain port.

A gang head for a machine tool according to a sixth aspect of the present invention is the gang head for a machine tool according to any one of the third to fifth aspects, wherein the labyrinth seal member is a thin labyrinth ring. .

In the gang head for a machine tool according to the present invention, a thin labyrinth ring commercially available as a labyrinth seal member is used.

[0024]

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

FIG. 1 shows an embodiment of a gang head for a machine tool according to the present invention. The gang head 1 for a machine tool includes a gear box including a head case body 3, a cover 7 attached to the head case body 3 by bolts 5, and a shaft support cylinder 11 fixed to the head case body 3 by bolts 9. Shaped head case 1
Three.

The head case 13 includes the rolling bearing member 1.
One rotation input shaft 19 is rotatably supported by 5 and 17, and a plurality of spindles 25 are rotatably supported by rolling bearing members 21 and 23. Each of the spindles 25 protrudes outward from a distal end opening of a spindle support protruding cylindrical body portion 27 formed on the cover 7, and a tool chuck 29 provided at the protruding end thereof has a tool 3.
1 is exchangeably mounted.

In order to transmit the rotation of the rotary input shaft 19 to each of the spindles 25, a drive gear 33 mounted on the rotary input shaft 19, a plurality of intermediate gears 35, and each of the spindles 25 are mounted in the head case 13. Main shaft gear 37
Thus, a gear train between the rotation input shaft and the spindle is provided for each spindle 25.

An oil mist supply pipe 39 is connected to the head case 13. A branch-out member (manifold member) 41 to which oil mist is supplied from an oil mist supply pipe 39 is provided in the head case 13.

A mist lubrication nozzle 43 is mounted in the head case 13 for each gear train between the rotary input shaft and the spindle for each spindle 25, and each mist lubrication nozzle 43 is branched by an internal pipe 45. The oil mist is distributed and supplied from the branch-out member 41 and is sprayed together with the high-pressure air toward the gear train.

An intermediate gear shaft 47 supporting each intermediate gear 35
Are each provided with a head case 13 by a rolling bearing member 49.
It is supported at both ends so that it can rotate more.

The bearing mounting portion of the head case 13 or the bearing cover 51 mounted on the head case 13 is formed with an exhaust vent hole 53 having a diameter of about 1 mm. The exhaust vent hole 53 is located on the opposite side to the inside of the head case with the rolling bearing member 49 interposed therebetween. As shown in FIG. 2, the airflow A flowing out of the exhaust vent hole 53 to the outside is reduced by the rolling bearing member 49. Flows through.

A thin labyrinth ring 57 is attached to the inner peripheral portion of the sleeve 55 of the shaft support cylinder 11, and the thin labyrinth ring 57 is shared with a circumferential groove member 59 fixed to the outer periphery of the rotary input shaft 19. Work to form a labyrinth seal (non-contact seal).

Thin labyrinth rings 61 and 63 are attached to the inner peripheral portion of the tip end of the spindle support projecting cylindrical body portion 27. The thin labyrinth rings 61 and 63 are circumferential groove members formed on the outer peripheral portion of the spindle 25. Together with 65 and 67, a double labyrinth seal (non-contact seal) is formed. In addition, the spindle support protruding cylinder 27 has a drain port 69 opened between the thin labyrinth rings 61 and 63.

Thin labyrinth rings 57, 61, 63
Is formed in a ring shape or a spiral shape from a metal material having a spring property, a commercially available product can be used, and a gap d (see FIG. 3) in the labyrinth seal portion is about 0.05 mm. Can be set to the minimum gap. Thus, the amount of high-pressure air leaking from the labyrinth seal portion is suppressed, and the internal pressure of the head case 13 is sufficiently increased.

The labyrinth seal may be doubled only at the portion where the coolant scatters. In the case of the coolant-less type, the labyrinth seal of the spindle portion may be single.

The head case 13 has a drain valve 71.
Is provided.

FIG. 4 shows an oil mist supply device. The oil mist supply device is an air filter 101
A pressure regulating valve 105 for regulating the compressed air from the compressed air source 103 to a mist primary pressure, a mist ejection opening / closing valve 107,
A mist pressure detector 109, a lubricating oil reservoir 111, a pneumatic oil pump 113 that pumps lubricating oil from the lubricating oil reservoir 111, and compressed air generated by the mist primary pressure and lubricating oil supplied from the oil pump 113 to supply lubricating oil. A nebulizing atomizer 115 for atomizing, a bypass compressed air passage 117 provided to bypass the nebulizer 115, a bypass flow rate adjusting valve 119 for adjusting a flow rate of compressed air flowing through the bypass compressed air passage 117, Oil supply on-off valve 121
And a pump drive valve 123, and supplies a high-pressure mixture (high-pressure oil mist) of lubricating oil atomized by the atomizer 115 and compressed air flowing through the bypass compressed air passage 117 to the branch-out member 41. I do.

A high-pressure mixture of atomized lubricating oil and compressed air is supplied from the above-described oil mist supply device to the branch-out member 41.
And the high pressure air-fuel mixture is distributed and supplied to the respective mist lubrication nozzles 43 by the internal pipe 45, and the mist lubrication oil (oil mist) is injected from the respective mist lubrication nozzles 43 together with the high pressure air toward the gear train. . Thus, the driving gear 33, the intermediate gear 35, and the main shaft gear 37 are lubricated with oil mist.

According to this lubrication method, there is no heat generated by stirring the lubricating oil, and lubrication is always performed with fresh mist lubricating oil. Therefore, the temperature of the lubricating oil does not rise and the thermal expansion of the spindle 25 is reduced. As a result, it is possible to increase the spindle speed and the machining accuracy. In addition, since the spindle 25 is cooled by the high-pressure air injected from the mist lubrication nozzle 43, the thermal expansion of the spindle 25 is also suppressed by this, and the processing accuracy can be improved.

The particle size of the atomized lubricating oil is preferably about 1 to 3 microns centered on 2 microns, and the required particle size is adjusted by adjusting the mist primary pressure in the oil mist supply device and selecting the lubricating oil to be used. A diameter distribution can be obtained, and a high atomization rate can be obtained by selecting a lubricating oil to be used, and a large amount of atomized lubricating oil can be obtained with a small amount of lubricating oil.

By spraying atomized lubricating oil (oil mist) into the head case 13 together with high-pressure air from the mist lubrication nozzle 43, the internal pressure of the head case 13 is increased, and a part of the high-pressure air is indicated in FIG. As shown by B, it flows out from the gap of the labyrinth seal part to the outside,
The air curtain effect can be obtained without the need for a special air curtain pipe, and in combination with the high internal pressure of the head case 13, the coolant liquid can be reliably prevented from entering the head case 13.

Even if the coolant passes through the labyrinth seal portion of the first stage formed by the thin labyrinth ring 61, the coolant does not flow out of the drain port 69 and does not enter the head case 13.

Since the sealing of the spindle 25 and the like is performed in a non-contact labyrinth seal system by the thin labyrinth rings 61 and 63, there is no limitation on the peripheral speed, which also enables the spindle speed to be increased. Become.

Further, since it is a non-contact seal, the spindle 25 is not worn and it is not necessary to apply a ceramic coating to the spindle 25.

An exhaust vent hole 53 is provided in the portion where the rolling bearing member 49 is disposed, and the airflow A flowing out of the exhaust vent hole 53 flows through the rolling bearing member 49. The lubricating oil is used to lubricate the rolling bearing member 49 without requiring any special piping, and the airflow A cools the rolling bearing member 49.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to this, and various embodiments may be made within the scope of the present invention. The possibilities will be clear to the skilled person.

[0047]

As will be understood from the above description, according to the gang head for a machine tool according to the first aspect of the present invention, the atomized lubricating oil is injected toward the gear train together with the high-pressure air from the mist lubricating nozzle. In addition, since the gear train is mist-lubricated, there is no heat generated by stirring the lubricating oil, so that the spindle speed can be increased and the machining accuracy can be increased. Further, since the internal pressure of the head case is increased by the mist injection and an air curtain effect is obtained, intrusion of the coolant liquid into the head case is reliably avoided.

Also, the elimination of the oil pump, the air curtain piping, and the oil seal and the elimination of oil agitation have reduced the energy consumption. Inspection is not required, and maintainability is improved. Further, the cost can be reduced by eliminating the need for the ceramic coating.

According to the gang head for a machine tool according to the second aspect of the present invention, the air flow passes through the bearing member due to the outflow of the air flow from the exhaust vent hole, and the mist head contains the mist-like lubricating oil. Is lubricated,
Lubrication of each bearing member is accurately performed without requiring special piping.

According to the gang head for a machine tool according to the third aspect of the present invention, since the spindle is sealed in a non-contact manner by the labyrinth seal member, there is no limitation on the peripheral speed. Can be speeded up.

According to the gang head for a machine tool according to the fourth aspect of the present invention, since the seal gap of the spindle by the labyrinth seal member is a minute gap necessary for increasing the internal pressure of the head case, the internal pressure of the head case is reduced. , The air curtain effect can be reliably obtained, and intrusion of the coolant liquid into the head case can be reliably avoided.

According to the gang head for a machine tool according to the fifth aspect of the present invention, the spindle and the rotary input shaft are sealed by the plurality of labyrinth seal members, and the coolant liquid passes through the first stage labyrinth seal member. As a result, the coolant flows out from the drain port between the labyrinth seal members, so that the coolant can be reliably prevented from entering the head case.

According to the gang head for a machine tool according to the present invention, a thin labyrinth ring which is commercially available as a labyrinth seal member is used, and a reliable labyrinth sealing effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a gang head for a machine tool according to the present invention.

FIG. 2 is an explanatory view showing a bearing lubrication section in a gang head for a machine tool according to the present invention.

FIG. 3 is an explanatory view showing a labyrinth seal portion in a gang head for a machine tool according to the present invention.

FIG. 4 is a circuit diagram showing an oil mist supply device for supplying oil mist to a gang head for a machine tool according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gang tool head for machine tools 13 Head case 19 Rotary input shaft 25 Spindle 31 Tool 33 Drive gear 35 Intermediate gear 37 Main shaft gear 39 Oil mist supply pipe 41 Branch out member 43 Mist lubrication nozzle 45 Internal piping 47 Intermediate gear shaft 49 Rolling bearing Member 53 Exhaust vent hole 57, 61, 63 Thin labyrinth ring 69 Drain port 103 Compressed air source 105 Pressure regulating valve 107 Mist ejection open / close valve 111 Lubricating oil reservoir 113 Oil pump 115 Atomizer 117 Bypass compressed air passage 119 Bypass flow rate adjustment valve

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tatsumi Enfuku 2068-3 Ooka, Numazu-shi, Shizuoka Toshiba Machine Co., Ltd. Numazu Office (72) Inventor Kazumi Aoki 2068-3 Ooka, Numazu-shi, Shizuoka Toshiba Machine Numazu In-house (72) Inventor Masahiro Watanabe 2 Takara-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Masaaki Sasaki 3-27-3 Sa, Gyoda-shi, Saitama Saitama Plant, Octopus (72) Inventor Hiroyuki Kawabata 3-27-3 Sakuma, Gyoda, Saitama

Claims (6)

[Claims] 1. A rotary input shaft and a plurality of spindles rotatably supported by a head case, and a rotation of the rotary input shaft provided for each spindle in the head case for transmitting the rotation of each spindle. A gang head for a machine tool having a gear train provided with at least one mist lubrication nozzle in the head case for each gear train, and atomized lubrication together with high-pressure air from the mist lubrication nozzle. A gang head for a machine tool, which injects oil toward a gear train. 2. A bearing member for rotatably supporting each gear shaft of the gear train is attached to the head case, an exhaust vent hole is provided in a mounting portion of the bearing member, and the exhaust member flows out of the exhaust vent hole. 2. The gang head for a machine tool according to claim 1, wherein the bearing member is lubricated by mist lubricating oil contained in the airflow as the airflow passes through the bearing member. 3. 3. The sealing of the spindle is performed by a labyrinth sealing member.
Or a gang head for a machine tool according to item 2. 4. The gap between the labyrinth seal member and the spindle for sealing the spindle is a minute gap necessary for increasing the internal pressure of the head case.
A gang head for a machine tool according to item 1. 5. The labyrinth seal member according to claim 3, wherein a plurality of the labyrinth seal members are provided for each seal portion of the spindle, and a drain port is provided between the labyrinth seal members. Gang head for machine tools. 6. The gang head for a machine tool according to claim 3, wherein the labyrinth seal member is a thin labyrinth ring.