JPH0321848Y2 - - Google Patents

Description

[Detailed description of the invention] The invention of the present application aims to solve the following problems.

(Industrial Application Field) This invention relates to a holder for holding a tool such as a drill or a workpiece to be processed in a machine tool.

(Prior art) An appropriate inclination angle with respect to the axes is formed between the clamping tube on which the object to be held, such as a tool or workpiece, is attached, and the rotating tube that fits into the clamping tube, although it does not intersect with these axes. By arranging a large number of rollers over a wide range and rotating a rotary cylinder, the rollers rotate around their own axis and revolve spirally, causing the tightening cylinder to contract and tighten the object to be held on its inner peripheral surface. The holder that is designed to hold the fastening tube has a problem in that a large force is required to contract the fastening tube, and therefore a large force is required to rotate the rotating tube. In order to solve this problem, attempts have been made to provide the inner circumferential surface of the fastening tube with a plurality of grooves parallel to the axis of the fastening tube. Since the object is divided in different directions, there is a problem in that the object to be held is less stable when it is held.

(Problems to be solved by the invention) This invention, except for the above-mentioned conventional problems, requires only a small force to rotate the rotating tube, and furthermore, when the object to be held is tightened, it is firmly held. The purpose of the present invention is to provide a holder that makes it possible to

The configuration of the present invention is as follows.

(Means for Solving the Problems) The holder in the present invention has a hollow cylindrical shape that can be elastically deformed in the radial direction, and is provided with an insertion hole for the object to be held with one end open inside, while the outer periphery is It has a fastening tube whose surface is tapered, and a rotary tube is arranged around the fastening tube, and a rotary tube is provided between the outer circumferential surface of the fastening tube and the inner circumferential surface of the rotary tube. In this method, a number of rollers each having a torsional position relative to the axis of the fastening cylinder are interposed so that the rotating cylinder can be moved in the axial direction of the fastening cylinder by rotating the rotating cylinder. In a holder in which the movable tube is rotated and moved to the larger diameter side of the fastening tube, the fastening tube is contracted and the object to be held is fastened, and the above-mentioned insertion hole is used. A large number of holes for absorbing strain of the clamping tube are arranged in a grid pattern on the inner circumferential surface of the clamping tube so as to be uniform in the axial and circumferential directions of the clamping tube.

(Function) When the base of the object to be held is inserted into the insertion hole of the clamping cylinder and the rotating cylinder is rotated, the rotating cylinder moves toward the large diameter portion of the clamping cylinder. As a result, the clamping tube is compressed inward, and the inner circumferential surface of the clamping tube comes into pressure contact with the outer circumferential surface of the object to be held, thereby holding the object. When the fastening cylinder is compressed, the large number of strain-absorbing holes provided on the inner circumferential surface of the fastening cylinder facilitates the contraction of the fastening cylinder.
In addition, the large number of holes mentioned above are arranged in a grid pattern all over the inner circumferential surface of the fastening cylinder, so the inner circumferential surface of the fastening cylinder maintains continuity in both the axial and circumferential directions. When the object to be held is tightened, it is held firmly and stably.

(Example) Below, drawings showing examples of the present application will be described. Reference numeral 1 denotes the main body, and 2 a connecting part provided at the base of the machine, which is a part that is attached to the spindle of a machine tool. Reference numeral 3 denotes a fastening cylinder integrally connected to one end of the main body 1, which is configured to be elastically deformable in the radial direction, and has an insertion hole 4 formed therein for inserting an object to be held. . Reference numeral 5 indicates a fastening surface on the inner circumferential surface of the fastening cylinder 3, on which a large number of holes 6 for strain absorption are provided. The holes 6 are arranged evenly in the axial direction (direction of arrow 30) of the fastening cylinder 3, and are also arranged evenly in the circumferential direction (direction of arrow 31). This scattered state resembles the shape of a chess board. The above-mentioned hole 6 is formed by, for example, electric discharge machining means. Reference numeral 7 designates the outer circumferential surface of the fastening tube 3, which is formed in a tapered shape that becomes thicker on the connecting portion 2 side. Next, reference numeral 17 denotes a rotary cylinder disposed on the outer peripheral side of the fastening cylinder 3, and its inner peripheral surface 18 is formed in a tapered shape parallel to the outer peripheral surface 7. Also, a well-known spanner groove 19 is formed on the outer peripheral surface. Next, reference numeral 21 denotes a guide tube disposed between the fastening tube 3 and the rotating tube 17, and as is well known, a plurality of guide holes are formed in the guide tube 21 to form a bird cage shape, and each guide hole has a roller 24. They are placed so that they can rotate freely. As is well known, these rollers 24 are twisted at a constant angle with respect to the central axis of the guide tube 21 (corresponding to the central axis of the fastening tube 3). 25 is a rubber seal for dustproofing,
Reference numeral 26 indicates a ring for holding the seal, and reference numeral 27 indicates a circlip for preventing the seal from coming off.

Next, a description will be given of an operation for holding an object to be held, such as a cutting tool (or a workpiece), using the holder configured as described above. First, insert the base of the cutting tool into the insertion hole 4. Next, the rotating cylinder 17 is rotated clockwise in FIG. Then, the large number of rollers 24 are guided by the guide tube and rotate in the twisted position relationship as described above, so by rotating the rotating tube 17, the large number of rollers 24 are rotated.
While rolling between the outer circumferential surface 7 and the inner circumferential surface 18, they proceed spirally along the outer circumferential surface 7 toward the large diameter portion 8. As a result, the rotating cylinder 17 also moves in the same direction. When the rotary tube 17 advances toward the large diameter portion 8 in this manner, the fastening tube 3 is compressed by the rotary tube 17 via the roller 24, and the diameter of the fastening tube 3 is reduced. As a result, the clamping surface 5 comes into close contact with the outer circumferential surface of the cutting tool and tightly tightens it.

In this tightened state, there are many holes 6 on the inner peripheral surface.
are provided in an even grid pattern, so the positional relationship with the outer peripheral tapered surface of the clamping cylinder is the same in any hole in the circumferential direction, so the clamping cylinder can contract evenly, and the object to be held is held with high precision. In addition, since the surface of the object that is strongly held is not pressed strongly in the hole, small deformations such as the surface of the object being held into the hole occur, causing numerous deformations in the axial and circumferential directions. The dispersed holes provide strong holding force in the axial and rotational directions.

When the fastening cylinder 3 is contracted by rotating the rotary cylinder 17 as described above, there are many holes 6 on the inner peripheral surface of the fastening cylinder 3.
, the fastening cylinder 3 has a high flexibility in bending in the direction in which it is compressed. The fastening tube 3 can be retracted with a relatively small force. Therefore, the force required to rotate the rotating tube 17 is small.
In the above case, even if oil is attached around the base of the object to be held, the oil can escape into the hole 6, and the inner circumferential surface 5 of the clamping cylinder 3 is The object to be held can be firmly tightened by directly mechanically contacting the object.

(Effects of the invention) As described above, in the present invention, when it is desired to hold an object, the base of the object to be held is inserted into the insertion hole 4 of the fastening cylinder 3, and the rotating cylinder 17 is rotated. Tighten tube 3
By moving the rotating cylinder 17 to the larger diameter side,
As a result, the clamping cylinder 3 is compressed through the rollers 24, and the inner circumferential surface 5 of the clamping cylinder 3 can clamp the base of the object to hold it.

Moreover, when the fastening cylinder 3 is compressed by rotating the rotary cylinder 17 as described above, the distortion of the fastening cylinder 3 due to the pressing and contracting of the fastening cylinder 3 is created on the inner periphery of the fastening cylinder 3 in the form of a checkerboard. A large number of holes 6 for strain absorption are scattered in the
Since the fastening cylinder 3 absorbs water evenly, the degree of uniform flexural adaptation in the direction in which the fastening cylinder 3 is compressed is high, and the rotation cylinder 17
The operational effect is that the force required for the rotation operation is relatively small.

Furthermore, even though the bolt is equipped with a large number of holes 6 so that it can be tightened with a relatively small force as described above, since they are arranged in a grid pattern on the inner circumferential surface 5 of the tightening tube 3, it is difficult to tighten. The inner circumferential surface 5 of the sleeve 3 is continuous in the circumferential direction at the positions indicated by the reference numerals 33, and also in the axial direction, the inner circumferential surface 5 is connected to the holes 6 as indicated by the respective reference numerals 32. They are substantially continuous over the entire length in the axial direction without any holes 6, and when the object to be held is tightened, the object to be held will be bent with respect to the clamping cylinder 3. It has the feature of exhibiting great rigidity against the force applied. This means that when machining an object to be held (in the case of a tool) or machining the object to be held (in the case of a workpiece), the object to be held can be held stably and the machining accuracy can be increased. It has the effect of improving

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, in which FIG. 1 is a half sectional view, FIG. 2 is a sectional view taken along the - line, and FIG. 3 is a developed view of the inner peripheral surface of the fastening cylinder. 3... Tightening tube, 4... Insertion hole, 6... Hole for strain absorption, 17... Rotating tube, 24... Roller.

Claims (1)

[Scope of utility model registration request] It has a hollow cylindrical shape that can be elastically deformed in the radial direction, and has a fastening cylinder whose inside has an open end for inserting the object to be held, and whose outer peripheral surface is tapered. A rotating tube is provided around the mounting tube, and a rotating tube is provided between the outer circumferential surface of the tightening tube and the inner circumferential surface of the rotating tube by rotating the rotating tube. A large number of rollers each having a twisted position with respect to the axis of the clamping cylinder are interposed so as to be able to move in the axial direction, and the rotary cylinder is rotated to move it to the larger diameter side of the clamping cylinder. In the holder, which is designed to contract the clamping tube and clamp the object by moving the clamping tube to A holder characterized in that the holders are evenly arranged in a checkerboard pattern in the axial direction and circumferential direction of the fastening tube.