JP2024018070A - Inner-diameter collet chuck with blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inner-diameter collet chuck with a blade, which cuts linear chips with a simple structure.

SOLUTION: The inner-diameter collet chuck with the blade comprises: a chuck mechanism that has a plurality of radial slits formed in a cylindrical member and that grips a workpiece through expansion, outside in a radial direction, of a collet divided in a peripheral direction by the slits; a seating block having a seating surface formed to position the workpiece gripped by the chuck mechanism; and one, two or more blades for cutting linear chips resulting cutting of the workpiece.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a bladed inner diameter collet chuck equipped with a blade for cutting linear chips generated during machining.

When rounding or cutting the outer circumferential surface of a workpiece using a lathe, chips are generated in the form of a continuous line. Such chips get wrapped around the workpiece or tool, interfering with machining operations in the lathe. Therefore, Patent Document 1 below proposes a method for preventing chips from being wrapped around the tool. Specifically, blades that generate wind are formed on a plurality of chuck jaws that grip or release a workpiece, and the wind flows toward the tool from the blades that rotate during workpiece processing.

Japanese Patent Application Publication No. 2014-193503

However, this makes it difficult to reliably cut linear chips, and the chuck itself becomes large because the blades must be made larger to obtain sufficient wind pressure. It is also thought that blades shaped to generate wind may become a target for additional linear chips to be wrapped around them. Furthermore, with the conventional chuck, it is necessary to set machining conditions such that the wind speed during lathe machining is within a certain range at the cutting position, which is not easy to use and is costly.

SUMMARY OF THE INVENTION In order to solve this problem, it is an object of the present invention to provide an inner diameter collet chuck with a blade that cuts linear chips with a simple configuration.

The bladed inner diameter collet chuck according to the present invention includes a chuck mechanism in which a plurality of radial slits are formed in a cylindrical member, and a collet divided in the circumferential direction by the slits grips a workpiece by spreading outward in the radial direction. a seating block formed with a seating surface for positioning a workpiece gripped by the chuck mechanism; and a seat block disposed radially outward of the seating surface for cutting linear chips generated by turning the workpiece. or with two or more blades.

According to the above configuration, a workpiece having a cylindrical portion that is positioned by being applied to the seating surface is gripped and rotated by the chuck mechanism on its inner diameter side, so that the outer peripheral surface of the workpiece and a tool such as a cutting tool can be applied to the workpiece. When turning is performed, linear chips are generated, and the chips are cut by one or more blades that are arranged radially outward of the seating surface and also rotate.

FIG. 2 is a partial cross-sectional side view of an embodiment of a bladed inner diameter collet chuck. FIG. 2 is a front view showing an embodiment of a bladed inner diameter collet chuck.

An embodiment of the bladed inner diameter collet chuck according to the present invention will be described below with reference to the drawings. FIG. 1 is a partially sectional side view showing a bladed inner diameter collet chuck of this embodiment, and FIG. 2 is a front view of the same bladed inner diameter collet chuck. A machine tool is equipped with a spindle device that grips and rotates a workpiece, and various chuck devices are installed therein depending on the target workpiece and processing details. One type of chuck device is an inner diameter collet chuck that grips a workpiece from the inside in order to turn the outer diameter of the workpiece.

The inner diameter collet chuck 1 of this embodiment is fixed to the end of a rotating spindle 80, and constitutes a main spindle device of a machine tool. Specifically, the main body block 4 is stacked on the end of the spindle 80 via the spacer 3 in the axial direction and fixed with screws, so that the center line O of the inner diameter collet chuck 1 is aligned with the rotation axis of the spindle 80. overlapping. The inner diameter collet chuck 1 has a chuck mechanism assembled to its main body block 4. In the chuck mechanism, a cylindrical mandrel 5 is fixed at the center position, and a collet 6 movable in the axial direction is provided on the radially outer side of the mandrel 5.

In the collet 6, a plurality of radial slits are formed in a cylindrical member, and a gripping part 61 is formed at each tip portion divided in the circumferential direction by the slits. A truncated cone-shaped outer tapered surface 51 whose diameter decreases toward the front side (right side in FIG. 1) is formed at the tip of the mandrel 5, and the gripping portion 61 of the collet 6 forms an outer tapered surface 51 at the tip of the mandrel 5. are in contact with each other. An inner tapered surface matching the angle of the outer tapered surface 51 is formed on the inner side of the grip portion 61, and the tapered surfaces that are in contact with each other are configured to slide.

Further, the collet 6 has a gripping surface parallel to the center line O formed on the outside in the radial direction of the gripping portion 61, and is configured to be applied to the inner circumferential surface of the cylindrical portion of the workpiece. In the main shaft device, a drawbar disposed coaxially with the centerline O is passed through a spindle 80, which is a hollow member, and is connected to a hydraulic cylinder that extends and contracts along the centerline O. The collet 6 is connected to the drawbar and is configured to be displaced in a direction along the center line O by the expansion and contraction operation of a hydraulic cylinder.

A seating block 7 is arranged on the radially outer side of the collet 6, so that the end of the workpiece fitted into the collet 6 is abutted against it. The seating block 7 is formed with a seating surface 71 on which a workpiece is applied, and the seating surface 71 is configured to allow air flowing through an air flow path opened in the seating surface 71 to check the seating of the seated workpiece W. Further, in this embodiment, a blade 8 is attached so as to be pushed up on the front side of the chuck. The blades 8 are for cutting linear chips generated during machining, and are provided at three locations on the same circumference at equal intervals on the outer periphery of the seating block 7.

The blade 8 is made by bending a thin iron plate at 90 degrees, and one surface is screwed to the seating block 7, and the other surface is a cutting portion for cutting linear chips extending from the workpiece W. 81. The blade 8 is attached so that the cutting portion 81 is perpendicular to the radial direction, but the blade 8 may be inclined so that the front side facing the rotation direction is inclined toward the center, for example.

The blade 8 is arranged on the outer peripheral portion of the seating block 7 away from the seating surface 71 so as to be located on the radially outer side of the workpiece W to be gripped. Further, the cutting portion 81 of the blade 8 is formed in a size that does not interfere with a tool that cuts the outer diameter of the workpiece W. Specifically, the height of the cut portion 81 that stands up parallel to the center line O is aligned with the seating surface 71 of the seating block 7 . That is, the tip of the cutting part 81 is formed with a dimension that does not protrude further to the front side than the seating surface 71, which is the position of the end of the workpiece W.

As shown in FIG. 1, the inner diameter collet chuck 1 performs a gripping operation while being inserted inside a cylindrical workpiece W. The collet 6 is drawn into the interior of the main body block 4 (on the left side in FIG. 1) via the drawbar by the operation of the hydraulic cylinder. The gripping portion 61 of the drawn collet 6 slides on the outer tapered surface 51 of the mandrel 5, and expands radially outward according to the taper angle. Then, the workpiece W is clamped so that the cylindrical portion of the workpiece W is grasped from the inside by the gripping portion 61 that is expanded.

The inner diameter collet chuck 1 holding the workpiece W rotates together with the spindle 80, and a cutting tool is applied to the outer circumference of the workpiece W to perform outer diameter machining. At this time, linear chips are generated from the outer peripheral surface of the cut work W and extend from the position where the cutting tool was applied, but the chips hit the cutting part 81 of the blade 8 rotating on the outside in the radial direction and are cut into short pieces. It will be done.

Therefore, the bladed inner diameter collet chuck 1 can prevent long linear chips from wrapping around the tool as in the past. Furthermore, since the blade 8 is simply a thin iron plate bent at 90 degrees, the effect can be achieved without incurring any cost. Since the blade 8 only needs to be tapped and screwed into the seating block 7, the above effect can be achieved by a simple improvement over the conventional inner diameter collet chuck.

Although one embodiment of the present invention has been described above, the present invention is not limited to this, and various changes can be made without departing from the spirit thereof.
For example, the structure of the inner diameter collet chuck is not limited to the structure of the mandrel 5 and collet 6 shown in the above embodiment. Further, the shape of the blade may be different from that of the above embodiment.

1... Inner diameter collet chuck 5... Mandrel 6... Collet 7... Seating block 8... Blade 81... Cutting section

Claims (3)

A chuck mechanism in which a plurality of radial slits are formed in a cylindrical member, and a collet divided in the circumferential direction by the slits spreads radially outward to grip a workpiece;
a seating block formed with a seating surface for positioning a work gripped by the chuck mechanism;
one or more blades disposed radially outward of the seating surface for cutting linear chips generated by turning the workpiece;
Internal diameter collet chuck with blade. The inner diameter collet chuck with a blade according to claim 1, wherein the blade is a thin iron plate bent and screwed. The inner diameter collet chuck with a blade according to claim 2, wherein the blade is formed with a dimension that does not protrude further to the front side than the seating surface of the seating block.

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