JPS5848044Y2 - Chuck grease supply device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a grease supply device for a chuck that is attached to a spindle of a machine tool and used for rotation.
An object of the present invention is to provide a chuck grease supply device having a simple configuration so as to be able to reliably supply grease to each sliding surface requiring grease lubrication over a long period of time.

Embodiments of the present application will be described below based on the drawings.

(Note that the drawings ignore the possibility of assembly for the sake of simplicity.

) In the drawing, 1 is a spindle of a machine tool such as a lathe, and 2 is a chuck fixed to this spindle 1 with a mounting bolt 3.

The chuck body 4 has a cylindrical shape as a whole, and a sliding hole 5 in the axial direction of the chuck 2 is formed in the center, and a plurality of holes (three in this example) are formed on the front surface. Book)
Chuck pawl grooves 6 (hereinafter referred to as pawl grooves 6) are formed radially at equal angular intervals.

Guide grooves 6a are formed on opposing sides of these pawl grooves 6, respectively.

As is well known, a master jaw 7 is fitted into each claw groove 6 so as to be slidable in the radial direction by fitting guide portions 7a protruding from both sides of the master jaw 7 into the guide groove 6a. Top mounting bolt 9 is attached to the front of mounting 7.
It is attached by.

The master jaw 7 and top jaw 8 constitute a chuck jaw 10, and the chuck jaw 10 may be integrally constructed.

A wedge portion 7b having a T-shaped cross section is formed at the radially inner end of the master jaw 7.

Next, a fitting portion 11 of the draw member 11 is provided in the sliding hole 5.
B is fitted 1 so as to be slidable in the axial direction (left and right force direction as viewed in FIG. 1).

The fitting portion 11a of the draw member 11 has a T-shaped wedge groove 1 on its outer periphery that fits with the T-shaped wedge portion 7b.
1b are respectively formed, and the wedge portion 7b of the master jaw 7 is slidably fitted into these wedge grooves 11b.

The shaft portion 11C (/-1) of the draw member 11 is projected into the hollow hole 1a of the spindle 1, and a connecting bolt 13 screwed into the drawbar 12 in the spindle 1 is fixed to the rear end of the shaft portion 11c. They are connected by a nut 14 or the like.

The draw member 11, the draw bar 12, and the connecting bolt 13
constitutes the operating member 15.

The drawbar 12 is reciprocated in the axial direction by a pneumatic or hydraulic cylinder (not shown) attached to the rear end of the spindle 1. 10 is adapted to be slid in the radial direction.

For the chuck 2 as described above, the grease supply device of this embodiment is further configured as follows.

First, in the chuck body 4, a grease storage hole 16, a detection rod insertion hole 17, and a detection row head storage hole 18 are formed in order in the radial direction at a position offset from the center of rotation.

These holes 16, 17, and 1811 are formed at positions that equally divide the circumference of the chuck body 4 due to rotational balance.

A grease extrusion piston 1 is provided in the grease storage hole 16.
9 is fitted to be slidable in the radial direction, and the inside of the grease storage hole 16 radially outside of the grease extrusion piston 19 is configured as a grease storage chamber 20.

The middle part 2 of the detection rod 21 is inserted into the detection rod insertion hole 17.
1a is slidably fitted, and the detection spring 22 is compressed and interposed between the locking collar 21b and the stepped portion of the detection rod insertion hole 17.
The detection row head 21c is urged toward the rotation center side by the chuck main body 4, and the detection row head 21c
is located within the detection rod storage hole 18.

The detection spring 22 has a spring force that is not compressed by the centrifugal force applied to the detection rod 21, but is compressed by the centrifugal force applied to the grease extrusion piston 19, so that the grease in the grease storage chamber 20 is low. Then,
The grease pushing piston 19 pushes out the detection rod by centrifugal force to notify the operator that the grease is running low.

Reference numeral 23 is a supply hole for supplying grease into the grease storage chamber 20, and a reverse IE valve 24 as shown is provided in the middle of the supply hole.

The supply hole 23ai'l of the supply hole 23 is located on the front surface of the chuck body 4, so that even when the chuck 2 is attached to a machine tool with a loader or a cover, grease can be easily supplied.

This is a ventilation hole for communicating the inside of the grease storage hole 16 radially inside the 25-port grease extrusion piston 19 with the outside.

Next, reference numeral 26 denotes a contact sliding hole that is formed in the chuck body 4 and in the bottom surface of the pawl groove 6 so that its axis is parallel to the axis of the chuck body 4. A cap-shaped movable contact Xf-27 having a communication hole 27a is slidably fitted.

This movable contact 27 is biased in the projecting direction by a spring 28 compressed and sealed in the contact sliding hole 26, and its tip end surface is brought into contact with the back surface of the master jaw 1.

The contact sliding hole 26 is communicated with the grease storage chamber 20 through a communication hole 29 formed in the chuck body 4.

Reference numeral 30 denotes a communication hole formed in the master chamber I, one end of which is opened on the back surface, and the other end is opened in the sliding surface of the guide portion 7a, wedge portion 7b, etc.

The opening 30au on the back side of the communication hole 30 communicates with the communication hole 27a of the movable contact 27 while facing each other when the master jaw 7 is slid to the grasping position, and the master jaw 7 is slid to the open position. When this happens, they no longer face each other and communication is cut off.

31 is the chuck body 4 and one end is the grease storage chamber 2
0 is a communicating hole formed such that the other end opens to the sliding surface of the sliding hole 5.

Furthermore, the communication hole 29 of the chuck body 4, the contact sliding hole 26, the communication hole 30 of the master jaw I, and the communication hole 31 of the chuck body 4 are grease for communicating the grease storage chamber 20 with each sliding surface. A supply path 32 is configured.

Next, the operation of the above configuration will be explained.

First, with the chuck claw 10 slid to the open position, grease is press-fitted into the grease storage chamber 20 from the supply port 23a of the supply hole 23 using a grease gun or the like. The grease is fully supplied into the grease storage chamber 20 by sliding toward the rotation center side, and is then supplied into the communicating holes 29, 31 and the contact sliding holes 26 of the old chuck body 4.

The grease supplied into the grease storage chamber 20 and the like as described above is prevented from flowing out by the check valve 24 provided in the middle of the oil supply hole 23 even after the grease has been supplied from the supply port 23a.

Next, the drawbar 12 of the operating member 15 is moved to the left in FIG. Let them grasp it.

When the chuck claw 10 is slid to the grasping position as described above, the opening 308 of the communication hole 30 in the master jaw 1 faces the communication hole 27a of the movable contact 27, and the master jaw 7
The sliding surfaces such as the guide portion 7a and the wedge portion 7b are communicated with the grease storage chamber 20.

Thereafter, the chuck 2 is rotated to carve the workpiece. When the chuck 2 is rotated in this way, the grease extrusion piston 19 is urged in the radial outward force direction by centrifugal force, and the inside of the grease storage chamber 20 is Pressurize the grease.

Therefore, the grease in the grease storage chamber 20 is reliably supplied to each sliding surface through the grease supply path 32 by the above-mentioned pressurizing force.

In this case, since grease is supplied from the contact sliding hole 26 to the communication hole 30 of the master jaw 7 through the communication hole 27a of the movable contact 27, there is a gap between the bottom surface of the pawl groove 6 and the back surface of the master jaw 7. Since a large amount of grease does not flow out from the base, there is less wastage of grease.

Next, after finishing machining the workpiece, the rotation of the chuck 2 is controlled by IL.
Then, slide the chuck claw 10 radially outward to remove the chuck 7.
The grip on the 7fl ball is released, but when the rotation of the chuck 2 is stopped in this way, the centrifugal force exerted on the grease extrusion piston 19 disappears, and the pressurizing force on the grease in the grease storage chamber 20 disappears. da master jiyo 7
When the movable contact 27 is slid to the open position, the opening 30a of the communication hole 30 no longer faces the communication hole 27a of the movable contact 27, and communication is interrupted.

Therefore, when the chuck 2 is not used for a long period of time, the amount of grease leaking out of the chuck 2 can be extremely reduced by sliding the chuck claws 10 to the open position and peeling them off. can.

As described above, when the chuck 2 grips and rotates the workpiece, the grease in the grease storage chamber 20 is actively supplied to each sliding surface, but when the grease in the grease storage chamber 20 becomes low, the grease is pushed out. The piston 19 pushes the detection rod 21 radially outward against the detection spring 22, whereby the detection line head 21c protrudes from the detection line head storage hole 18.

Therefore, the operator can visually confirm from the front of the chuck body 4 that the amount of grease remaining is small.

In the above embodiment, a movable contactor is used to prevent grease from leaking between the chuck body and the chuck jaws, but unlike the sliding positioning mechanism of the master jaw, the movable contactor is used to prevent grease from leaking between the chuck body and the chuck jaws. When supplying grease to the chuck jaw side where the gap is small, the movable contact can be omitted.

Further, although the above embodiments show the case where the invention is applied to a wedge-shaped chuck, the present invention can be similarly applied to other chucks such as a crank-type chuck and a drawdown-type chuck.

1. If the grease supply path has branches, install a fixed or variable throttle as necessary in the middle of the grease supply path after the branch so that the grease is supplied to each sliding surface without excess or deficiency. good.

As described above, in the present invention, when the chuck is rotated, the grease extrusion piston uses centrifugal force to pressurize the grease in the grease storage chamber. Since the grease is supplied to the sliding surfaces, by supplying the grease into the grease storage chamber and pressing the button, the grease can be reliably supplied to each sliding surface by a length IDV'CFj when the chuck is rotated.

Therefore, during the subsequent grasping operation, it is possible to reliably supply grease to each sliding surface and protect the contact surface of each sliding surface with an appropriate amount of grease, making the grasping operation smooth and reducing wear. This has the effect of being able to obtain stable high precision and high gripping force over a long period of time, and also has the operational effect of lengthening the interval between grease refills.

In addition, since the grease is pressurized by centrifugal force acting on the grease extrusion piston as described above, there is no need to connect a separate grease pressure device to the chuck, and the chuck installation work can be done quickly. It is effective in handling.

Furthermore, since the centrifugal force generated by the rotation of the chuck is used to pressurize the grease, when the chuck rotation is stopped and the grease is peeled off, the grease in the grease storage chamber is not compressed, and the grease is not stored during storage. This has the advantage of preventing grease from leaking inside the room.

[Brief explanation of drawings]

Figure 1 is a sectional view taken from the rear with the chuck claw in the open position, and is a sectional view taken along line 1--1 in Figure 2; FIG. 3 is a partial view showing the state in which the chuck claws are positioned at the grasping position. 4... Chuck body, 16... Grease storage hole, 1
9... Grease extrusion piston, 20... Grease storage chamber, 32... Grease supply path.

Claims (1)

[Scope of utility model registration request] A grease storage hole is formed in the chuck body at a position offset from the center so that its axis is in the radial direction.
A grease extrusion piston is fitted into the grease storage hole so as to be slidable in the radial direction, and the inside of the grease storage hole radially outside of the grease extrusion piston is configured as a grease storage chamber capable of storing grease supplied from the outside. The inside of the grease storage hole on the radially inner side of the grease extrusion piston is communicated with the outside, and the chuck body is further provided with a grease supply path, one end of which communicates with the grease storage chamber and the other end of which communicates with the sliding surface of other members. A chuck grease supply device characterized in that it is provided with a screw.