JP5212790B2 - Sealed chuck - Google Patents

Description

  The present invention relates to a hermetic chuck in which lubricating oil is sealed in an inner space of a chuck body.

  Conventionally, a chuck body in which an inner space is formed by joining a main body front member and a rear body member is provided with a plurality of guide holes so as to open into the inner space, and a claw opening / closing member is provided in each guide hole. A draw-down chuck disclosed in Patent Document 1 is used as a hermetic chuck in which a gripping claw attached to each claw opening / closing member is moved in the chuck radial direction by a driving member provided in the chuck body in a state where lubricating oil is sealed in the space. Further, a chuck described in Patent Document 2 is known.

Japanese Patent No. 3322391 JP 2007-237339 A

  The draw down chuck described in Patent Document 1 and the chuck described in Patent Document 2 lubricate the sliding portion of the driving member and the claw opening / closing member with the lubricating oil sealed in the inner space of the chuck body to prevent wear of them. It is supposed to be. Considering the weight balance during rotation, it is desirable that the inner space be filled without any gaps. However, since the lubricant gradually leaks to the outside due to the use of the chuck, periodic lubrication of the lubricant Replacement is necessary. When the amount of lubricating oil in the inner space decreases, when the chuck stops rotating, the lubricating oil accumulates in the lower and lower guide holes in the inner space, and the upper guide hole becomes out of lubricating oil. . In this way, if the chuck is rotated when the lubricating oil in the chuck body is biased, the lubricating oil accumulated in the guide hole continues to stay in the same position under the centrifugal force, resulting in poor weight balance of the chuck and high rotation. If used, vibration may occur, which may affect machining accuracy.

In addition, when the workpiece is mounted or removed by an autoloader or robot, it is often necessary to set the chuck rotation stop position to a fixed position (constant phase). In this case, the chuck always starts from the same position (phase). The rotation starts. At this time, the lubrication state of the sliding portion of the claw opening / closing member located on the lower side and the engagement portion with the driving member engaged with the claw opening / closing member is good, but the lubrication state of the same member located on the upper side is the former. In comparison, it is not preferable, and if it is used in this state for a long time, there is a possibility that uneven wear occurs at the engaging portion of the claw opening / closing member and the driving member, and that the sliding portion is stuck.
Therefore, in view of the above problems, the problem of the present invention is that the lubricating oil is reduced and the chuck is rotated even if the lubricating oil is biased in the guide holes located below and below the inner space when the chuck stops rotating. It is an object of the present invention to provide a hermetic chuck that can prevent deterioration of the weight balance when it is used and can suppress the occurrence of vibration even when used at a high rotation speed and can stabilize machining accuracy.

The present invention provides a chuck body in which an inner space is formed by joining a main body front member and a main body rear member, a plurality of guide holes are provided so as to open to the inner space, and a claw opening / closing member is provided in each guide hole, while encapsulating the lubricating oil to the inner space, the drive member having a chuck body, in sealed chucks grasp claws attached to the claw opening and closing member to move the chuck radially into the body before member A mounting hole for inserting the rear member of the main body, an annular groove is formed at the intersection of the inner diameter of the mounting hole and the end surface, and each guide hole is communicated with the annular groove, and any one of the inner space and the inner space is rotated when the chuck rotates. The lubricating oil in the guide hole is dispersed in the other guide hole through the annular groove (claim 1).
Further, according to the present invention, the main body front member is provided with an oil supply hole for supplying lubricating oil in an inner space of the chuck main body, and provided with a lubricating oil flow path that communicates the oil supply hole and the annular groove . The lubricating oil is dispersed in the guide hole and the inner space through the annular groove via the lubricating oil flow path (Claim 2 ).

According to the invention of claim 1 of the present application, the main body front member is provided with a mounting hole for fitting the main body rear member, an annular groove is provided at the intersection of the inner diameter of the mounting hole and the end surface, and the guide holes are provided. By communicating with the annular groove, the lubricating oil in the inner space and any of the guide holes is dispersed through the annular groove to the other guide holes when the chuck is rotated. The balance becomes good, and even when used at a high rotation, the generation of vibrations is suppressed and the machining accuracy can be stabilized. Even if the rotation stop position of the chuck is controlled to a fixed position (constant phase) and rotation of the chuck is always started from the same position (phase), the occurrence of uneven wear at the engaging portion of the claw opening / closing member and the drive member In addition, it is possible to prevent the engagement portions and the sliding portions from becoming tangled.

According to the invention of claim 2 of the present application, the main body front member is provided with an oil supply hole for supplying lubricating oil in the inner space of the chuck main body, and a lubricating oil flow path that communicates the oil supply hole with the annular groove is provided . Lubricating oil in the oil supply hole during rotation is distributed to the guide hole and the inner space through the annular groove via the lubricating oil flow path . Lubricating oil can be discharged from both sides, and the lubricating oil can be replaced efficiently in a short time. Also, the lubricating oil in the oil supply hole during chuck rotation can be dispersed in the guide hole and the inner space through the annular groove via the lubricating oil flow path.

Hereinafter, a sealed chuck (hereinafter referred to as a chuck) as an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of the chuck 1A, and FIG. 2 is a sectional view taken along the line II-II. FIG. 3 is a rear view of the main body front member 3 constituting the chuck body 2 as viewed from the rear, and the state of the lubricating oil inside the chuck when rotation is stopped is simplified. (Omitted). FIG. 4 is a perspective view of the front body member 3 of the chuck 1A. FIG. 5 is an enlarged view of a Z portion in FIG.

The chuck main body 2 of the chuck 1A has a main body front member 3 (hereinafter referred to as a front body) and a main body rear member 4 (hereinafter referred to as a back plate) joined together and fixed by mounting bolts 6 to form an inner space 7. Yes. The joint between the front body 3 and the back plate 4 is configured by fitting the back plate 4 into a mounting hole 5 provided in the front body 3, and the rear side of the front body 3 is as shown in FIG. A plurality of (three in the embodiment of the present invention) guide holes 8 that open into the inner space 7 and are radially arranged at equal intervals in the circumferential direction are formed, and the front of each guide hole 8 is the front body 3. Open to the front. Each guide hole 8 is provided with a claw opening / closing member 13, and a grasping claw 9 attached to each claw opening / closing member 13 by a drive member 19 provided in the chuck body 2 in a state where the lubricating oil R is sealed in the inner space 7. Is moved in the chuck radial direction. Each guide hole 8 communicates with each other by an annular groove 10 formed at the intersection of the inner diameter 5a of the mounting hole 5 and the end face 5b .

A guide member 12 is provided in each front opening 11 of each guide hole 8. Further, a claw opening / closing member 13 is pivotally supported in each guide hole 8 by a support shaft 33 provided so as to cross the guide hole 8, and its front part is the front surface of the front body 3. It is in sliding contact with the guide member 12 provided for. The front opening 11 of each guide hole 8 and the fitting portion between the guide member 12 and the sliding contact portion between the guide member 12 and the claw opening / closing member 13 enter the cutting fluid from the outside and lubricate from the inner space 7. Seal members 14 and 15 for preventing oil from flowing out are interposed respectively. The back plate 4 is provided with a seal member 16 at a fitting portion with the front body 3 to prevent intrusion of cutting fluid or the like from the outside and outflow of the lubricating oil R inside the inner space 7 and the guide hole 8. .

  Support holes 17 and 18 are formed on the chuck axis CL of the front body 3 and the back plate 4, respectively, and a drive member 19 is mounted so as to be slidable back and forth. A guide member 20 having a center 21 slidably mounted therein is inserted into the front body 3 so as to close the support hole 17 from the front surface of the front body 3, and a fitting portion between the guide member 20 and the front body 3, and the center 21. These sliding portions are respectively provided with seal members 22 and 23 to prevent the intrusion of cutting fluid or the like from the outside. In addition, seal members 24 and 25 are interposed in the support hole 18 which is a fitting portion between the drive member 19 and the back plate 4 and the support hole 17 which is a fitting portion between the drive member 19 and the front body 3, respectively. 7 prevents the lubricating oil R from flowing out. The outer diameter of the front body 3 is provided with an oil supply hole 26 for supplying the lubricating oil R to the inner space 7 of the chuck body 2, and the oil supply hole 26 and the annular groove 10 are communicated with each other through a lubricant oil flow path 27. ing.

The chuck 1 </ b> A configured as described above is fixed to the front end of the main shaft portion 29 of a processing machine such as a lathe by a mounting bolt 28 provided in the chuck main body 2, and the chuck main body 2 rotates with the rotation of the main shaft portion 29. Yes. The drive member 19 is connected to a piston (not shown) of a rotary cylinder (not shown) installed at the rear end of the main shaft portion 29 via a connecting rod 31, and the drive member 19 is moved in the chuck axis CL direction by the operation of the piston. It moves back and forth, engages with each claw opening / closing member 13, and the gripping claw 9 attached to the tip of each claw opening / closing member 13 moves inward and outward in the chuck radial direction to clamp and unclamp. .
The chuck 1A attached to a processing machine such as a lathe is clamped with the workpiece attached to the gripping claw 9 in a stopped state, the chuck body 2 is rotated and processed, and when the processing is finished, the gripping claw 9 is unlocked. The workpiece is removed by clamping. In general, the processing time of a workpiece processed by a lathe is relatively short, such as several tens of seconds to several minutes, and the number of processing per day tends to be large. Therefore, the chuck 1A is required to have high durability and weight balance since the gripping claw 9 is frequently moved and the chuck body 2 is repeatedly rotated and stopped, and is used at a high rotation. For this reason, at the time of shipment, the lubricating oil R is tightly sealed in the inner space 7 of the chuck body 2 in order to improve the weight balance. In the chuck 1A, since the lubricating oil R decreases and deteriorates when used for a long time, an oil supply hole 26 is provided so that the lubricating oil R can be periodically replenished or replaced.

In the chuck 1A according to the embodiment of the present invention, even if the lubricating oil R decreases and the lubricating oil R is biased in the guide holes 8 located below and below the inner space 7 when the chuck body 2 stops rotating, The front body 3 and the back plate 4 can prevent the deterioration of the weight balance when the chuck body 2 is rotated, and can suppress the generation of vibrations and stabilize the machining accuracy even when used at a high rotation speed. An annular groove 10 is provided on the outer side of the joint in the radial direction of the chuck from the inner space 7, and each guide hole 8 is communicated with the annular groove 10. So that the amount of the lubricating oil R in each guide hole 8 is uniform.
The chuck 1 </ b> A is configured such that a joint between the front body 3 and the back plate 4 is formed by fitting the back plate 4 into a mounting hole provided in the front body 3, and an annular groove 10 is formed between the inner diameter and the end surface of the mounting hole 5. By forming it at the intersection, it can be formed on the outermost side in the chuck radial direction in the chuck body, so that the lubricating oil can be dispersed efficiently.

  As a result, the chuck 1A has a good weight balance at the time of rotation, and even when used at a high speed, the occurrence of vibration can be suppressed and the machining accuracy can be stabilized. Also, when the workpiece 1 is attached / detached by an autoloader or a robot, the rotation stop position of the chuck 1A is controlled to a fixed position (constant phase), and the chuck 1A is always started from the same position (phase). In addition, it is possible to prevent the occurrence of uneven wear at the engaging portion of the claw opening / closing member 13 and the driving member 19 and the squeezing of the engaging portion and the sliding portion due to oil shortage, thereby extending the product life. And economical.

Further, as shown in FIG. 5 , the annular groove 10 is provided at the intersection of the inner diameter 5a of the mounting hole 5 and the end face 5b . A grinding clearance groove 32 is generally required for processing at the intersection between the inner diameter 5a of the mounting hole 5 and the end face 5b . If the grinding clearance groove 32 and the annular groove 10 are used in combination, the groove It is not necessary to process the annular groove 10 using a dedicated cutting tool for processing, which is preferable because processing costs can be reduced.

Further, and it each guide hole 8 communicates with the annular groove 10, the lubricating oil of the oil supply hole 26 to refuel the lubricating oil R in the interior space 7 of the chuck body 2 provided, communicating the oil supply hole 26 and the annular groove 10 By providing the flow path 27, the lubricating oil R can be discharged from both the inner space 7 and the respective guide holes 8 when the lubricating oil is replaced, and the replacement work of the lubricating oil R can be performed efficiently in a short time, resulting in productivity. Can be improved. In addition, since the lubricating oil R in the oil supply hole 26 during chuck rotation can be dispersed in the guide hole 8 and the inner space 7 through the annular groove 10 via the lubricating oil flow path 27, The weight balance can be improved.

It is a front view of a chuck showing an embodiment of the present invention. It is the II-II sectional view taken on the line of FIG. It is a rear view of the chuck | zipper main body which is the components of the chuck | zipper which shows embodiment of this invention. It is a perspective view of a chuck body which is a part of a chuck showing an embodiment of the present invention. It is principal part sectional drawing of the chuck | zipper which shows embodiment of this invention .

Explanation of symbols

1A to 1D Chuck 2 Chuck body 3 Front body (Main body front member)
4 Back plate (main body rear member)
5 mounting hole 5a inner diameter of mounting hole 5b end surface of mounting hole 7 inner space 8 guide hole 9 grasping claw 10 annular groove 13 claw opening / closing member 19 driving member 26 oil supply hole 27 lubricating oil flow path R lubricating oil

Claims (2)

A chuck main body formed by joining the front body member and the rear body member to form an inner space is provided with a plurality of guide holes so as to open to the inner space, and a claw opening / closing member is provided in each guide hole. In a sealed chuck in which a gripping claw attached to each claw opening / closing member is moved in the chuck radial direction by a drive member provided in the chuck body in a state where lubricating oil is enclosed, the front body member is a rear body member. Mounting holes, and annular grooves are formed at the intersections between the inner diameters of the mounting holes and the end faces. The guide holes are communicated with each other by the annular grooves. A hermetic chuck characterized in that a certain lubricating oil is distributed to other guide holes through an annular groove. The main body front member is provided with an oil supply hole for supplying lubricating oil in the inner space of the chuck main body, and a lubricating oil flow path that connects the oil supply hole and the annular groove is provided, so that the lubricating oil in the oil supply hole is provided when the chuck rotates. 2. The hermetic chuck according to claim 1 , wherein the chuck is dispersed in the guide hole and the inner space through an annular groove via a lubricating oil passage .

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