JP3832609B2 - Chuck - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chuck that checks the seating of a work by supplying air to a seating confirmation hole of a work locator provided on the front surface of the chuck body. More specifically, the present invention easily discharges clogged dust in the seating confirmation hole of the work locator. It relates to a possible chuck.
[0002]
[Prior art]
Some conventional chucks check the presence or absence of a workpiece by discharging air from a seating confirmation hole of a work locator provided on the front surface of the chuck body. For example, such a chuck will be described with reference to FIG. 1. A chuck body 1 is attached to a lathe spindle 3 via a chuck adapter 2, and a work locator 8 is bolted to the front surface of the chuck body 9 of the chuck body 1. 18 is attached. A seating confirmation hole 39 is provided in a seating surface 45 on which the workpiece W on the front surface of the work locator 8 is seated. The seating confirmation hole 39 has an air passage 40 of the work locator 8, an air passage 41 of the chuck body 9, and a chuck adapter 2. The air passage 42 and the air passage 43 of the main shaft 3 communicate with each other, and are connected to an air circuit (not shown) via these air passages 40, 41, 42, 43. , 43 are led to the seating confirmation hole 39, and seating is confirmed by the air circuit. Since the seating confirmation hole 39 of the work locator 8 is clogged with dust or the like, if the seating confirmation hole 39 is clogged, cleaning is performed with a needle from the seating surface 45 side of the work locator 8.
[0003]
[Problems to be solved by the invention]
In the conventional chuck, when the seating confirmation hole is clogged with dust, it is picked up and cleaned with a needle. At this time, the dust is not taken out of the work locator but discharged into the air passage. There is a problem that dust accumulates in the air passage, and the dust accumulated in the air passage cannot be reliably discharged, and maintenance is not easy. In addition, there is a problem that the air passage is blocked by accumulated dust or the seating confirmation hole is blocked again. When the air passage or the seating confirmation hole is blocked, it is erroneously detected that a work is seated on the work locator, and there is a problem that a seating confirmation error occurs.
An object of the present invention is to allow dust in the seating confirmation hole to be easily discharged out of the work locator instead of into the air passage when the seating confirmation hole is clogged with dust.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides an air passage for supplying air to a seating confirmation hole in a work locator for seating a work provided on the front surface of the chuck body, and a seating confirmation hole on the front surface of the work locator. In the chuck, where the presence / absence of the workpiece is confirmed by means of the above, a dust discharge hole is provided on the back of the work locator so as to face the seating confirmation hole of the work locator, and a closing member for closing the dust discharge hole is provided. (Claim 1). More specifically, the plug is a detachable plug (Claim 2), and a work locator is detachably attached to the chuck body (Claim 3).
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to FIGS. The chuck is a collet chuck that grips the inner diameter of the workpiece W with a collet 11, and the chuck body 1 is fixed to a spindle 3 of a lathe that is a cutting machine through a chuck adapter 2 that is an attached body. The chuck adapter 2 is fixed to the main shaft 3 of the lathe with bolts 4 and has a tapered recess 6 formed on the front surface. The chuck body 1 includes a mandrel body 7, a work locator 8, a chuck body 9, a plunger 10 and a collet 11.
[0006]
The mandrel body 7 is formed by a tapered convex portion 12 that fits into the tapered concave portion 6 of the chuck adapter 2 and a cylindrical portion 13 that protrudes forward from the center of the tapered convex portion 12. The tip end portion is formed on the tapered surface 14. The mandrel body 7 has a tapered convex portion 12 connected to the rear surface of the chuck body 9 with a bolt 16, and a cylindrical portion 13 is inserted into the chuck body 9 and attached to the front surface of the chuck body 9 with a bolt 18. The work locator 8 is penetrated. A collet 11 that grips the inner diameter of the workpiece W is slidably fitted to the outer periphery of the cylindrical portion 13 of the mandrel body 7, and a guide hole 19 is provided on the rear side of the mandrel body 7. A small-diameter shaft portion 20 at the front portion of the plunger 10 is slidably inserted.
[0007]
The collet 11 includes a gripping portion 21 that grips the inner diameter of the workpiece W at the front end, a flange portion 22 at the rear end, and an intermediate thin portion 23, and the gripping portion 21 and the thin portion 23 are divided into a plurality. The inner peripheral surface of the grip portion 21 is formed on a tapered arcuate surface 24 that can slide with the tapered surface 14 at the tip of the mandrel body 7. In addition, a center hole 25 is provided at the center of the flange portion 22 so as to be slidably guided on the outer peripheral surface of the cylindrical portion 13 of the mandrel body 7. The flange portion 22 is tapered on the connecting portion 26 of the plunger 10. The bolts 28 are connected via a spacer 27 that penetrates the portion 12.
[0008]
A large-diameter shaft portion 29 projects from the rear center of the plunger 10, and the large-diameter shaft portion 29 passes through the center hole 15 of the chuck adapter 2. A plurality of latching pieces 30 are formed on the inner periphery of the large-diameter shaft portion 29, and the leading end portion of the connecting rod 31 inserted through the main shaft 3 is engaged with the latching piece 30, and the plunger is inserted via the connecting rod 31. 10 is connected to a rotating cylinder (not shown). The plunger 10 advances and retracts integrally with the collet 11 by the action of the rotating cylinder, and when the plunger 10 is retracted, the gripping portion 21 expands against the elasticity of the thin portion 23 by the taper surface 14 and grips the workpiece W. When it is taken out and advanced, the gripping part 21 is closed by the elasticity of the thin part 23 and the work W is released. Between the mandrel body 7 and the plunger 10, there is a spring 17 that urges the plunger 10 backward with respect to the mandrel body 7 and urges the gripping part 21 in the expanding direction (work gripping direction). It is intervened.
[0009]
As shown in FIG. 2, three arc-shaped long holes 33 are formed at equal angles in the circumferential direction in the attachment portion 32 of the chuck body 9. These elongated holes 33 are inserted so that the chuck mounting bolts 34 can be rotated, and are slightly larger than the diameters of the wide portions 33 a formed so as to accommodate the heads of the chuck mounting bolts 34 and the threaded portions of the chuck mounting bolts 34. The narrow portion 33b is formed with a large diameter end 33c into which the head of the chuck mounting bolt 34 can be fitted. The large-diameter end 33c is fitted into the head of the chuck mounting bolt 34 that is screwed to the chuck adapter 2 when the chuck body 1 is attached to the chuck adapter 2, and the chuck body 1 is rotated to oppose the other end. The end 33d is positioned on the threaded portion of the chuck mounting bolt 34, and in this state, the chuck mounting bolt 34 is tightened to mount the chuck body 1 to the chuck adapter 2 at a predetermined phase around the rotation axis. A cover 36 serving as a retaining portion for preventing the chuck mounting bolt 34 from being pulled out in the pull-out direction (the same direction as the chuck rotation axis) is fixed to the front surface of the mounting portion 32 by screws 37. The cover 36 is formed with three through holes 38 which are narrower than the head of the chuck mounting bolt 34 and slightly larger than the maximum diameter of the hexagonal hole of the chuck mounting bolt 34 so as to overlap the long hole 33. A tool such as a wrench is inserted from 38 and the chuck mounting bolt 34 is operated. When the chuck mounting bolt 34 is loosened when the chuck main body 1 is removed from the chuck adapter 2, the cover 36 is pressed against the chuck main body 1 from the chuck adapter 2 by pressing the head of the chuck mounting bolt 34 in the axial direction. Jack up. After the chuck body 1 is jacked up, the chuck body 1 can be easily removed by rotating in the opposite direction to that when the chuck body 1 is attached to the chuck adapter 2 to remove the large diameter end 33c from the head of the chuck mounting bolt 34. It is like that.
[0010]
On the front surface of the work locator 8, six seating surfaces 45 with which the workpiece W abuts are formed at equal intervals in the circumferential direction. Every other seating surface 45, the seating surface 45 is centered on the seating surface 45. A seating confirmation hole 39 for seating confirmation is provided. The seating confirmation hole 39 communicates with the air passage 40 of the work locator 8, the air passage 41 of the chuck body 9, and the air passage 42 of the chuck adapter 2, and the air passage 42 is illustrated via the air passage 43 of the main shaft 3. The air is communicated with the air circuit so that air is supplied from the air circuit to the seating confirmation hole 39, and the seating of the workpiece W is confirmed by the detection means of the air circuit. Further, a dust discharge hole 46 for discharging dust such as chips is provided on the back surface 8 a of the work locator 8 so as to face the seating confirmation hole 39. The dust discharge hole 46 is closed by screwing a plug 47 which is a detachable closing member. The communication hole 44 on the chuck body 1 side of the air passage 42 is attached to the chuck adapter 2 at a position where the chuck body 1 is shifted from a predetermined phase (position where the phase is shifted leftward from the mounting state in FIG. 2). In this state, the air escapes to the outside air, and even if the workpiece W is seated in this state, the seating is not confirmed by the detecting means, and the chuck mounting abnormality can be confirmed. .
[0011]
When the seating confirmation hole 39 is clogged with dust, the collet 11 is moved forward together with the plunger 10 to close the gripping portion 21 of the collet 11, the bolt 18 is removed, and the work locator 8 is moved forward with respect to the chuck body 9. Remove from. After that, as shown in FIG. 3, the plug 47 on the work locator back surface 8a is loosened and removed, and the seating confirmation hole 39 is picked up by the needle 48, and dust stuck in the seating confirmation hole 39 is removed from the dust discharge hole 46 to the outside of the work locator 8. To prevent dust from accumulating in the air passage 40. As a result, the air passage 40 is not clogged and the seating confirmation hole 39 is not blocked again, so that a seating confirmation error can be prevented and maintenance is facilitated. After removing the dust from the seating confirmation hole 39, the dust discharge hole 46 is closed again with the plug 47, and attached to the front surface of the chuck body 9 with the bolt 18.
[0012]
The plug is screwed into the dust discharge hole. However, the plug may be a member that can be detachably fitted into the dust discharge hole. When the locator is attached to the chuck body, the rear surface of the work locator may be pressed against the front surface of the chuck body to block the dust discharge hole with the front surface of the chuck body. The present invention is not limited to the type of chuck that grasps the inner diameter of the workpiece, but can be applied to various types of chucks such as a three-claw chuck and a finger chuck that grasp the outer shape. In addition, the shape and configuration of each part of the chuck can be changed as appropriate without departing from the spirit of the present invention.
[0013]
【The invention's effect】
As described above, in the present invention, the dust discharge hole facing the seating confirmation hole is provided on the back surface of the work locator provided on the front surface of the chuck body, and the closing member capable of opening the dust discharge hole is provided. When the seating confirmation hole is blocked by dust or dirt, the dust discharge hole is opened, and the dust stuck in the seating confirmation hole can be easily and reliably discharged from the dust discharge hole to the outside of the work locator. This prevents dust from accumulating in the air passage of the work locator, prevents the seating confirmation hole from being closed again, prevents seating confirmation mistakes, and facilitates maintenance.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a chuck.
FIG. 2 is a front view of the chuck.
FIG. 3 is an explanatory diagram showing the discharge of dust.
[Explanation of symbols]
8 Work locator 9 Chuck body 39 Seating confirmation hole 40 Air passage 46 Dust discharge hole 47 Plug (blocking member)
W Work

Claims (3)

An air passage that supplies air to the seating confirmation hole is provided in the work locator that seats the work provided on the front surface of the chuck body, and the presence or absence of work is confirmed by the seating confirmation hole on the front surface of the work locator. A chuck characterized in that a dust discharge hole is provided on the back surface of the work locator so as to face the seating confirmation hole of the work locator, and a closing member for closing the dust discharge hole is provided. The chuck according to claim 1, wherein the closing member is a detachable plug. The chuck according to claim 1 or 2, wherein a work locator is detachably attached to the chuck body.

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