JPS62287949A - Holder - Google Patents

Abstract

PURPOSE:To enable large rigidity of a tightening cylinder to be obtained for its torsional force, by forming plural grooves on the internal peripheral surface of the tightening cylinder respectively to a shallow depth so that a large thickness is left existing between the bottom of the groove and the peripheral surface of the tightening cylinder. CONSTITUTION:Grooves 10, formed on an internal peripheral surface 5, are formed respectively with their section into a circular arc shape while in parallel with the axial line of a tightening cylinder 3 further in a large length in the axial line direction. While the groove shallowly forms its depth so that a large thickness is left existing between the bottom of the groove and a peripheral surface 7 of the tightening cylinder 3. Annular reinforcing parts 12, 13, respectively provided in sides of an opening part and a deep part from the groove 10, are formed rospectively in a uniform thickness over the whole periphery. The groove 10 shallowly forms its depth to an extent such that the left existing large thickness part below the bottom of the groove supports a forced contact part 11 with both the annular reinforcing parts 12, 13 enabling the forced contact part 11 to be prevented from being deformed in the direction of torsional force when its large amount is transmitted to a held object for the tightening cylinder 3 in a condition that each forced contact part 11 is forced to come into contact with the held object.

Description

[Detailed description of the invention] 3. Detailed description of the invention The present invention aims to solve the following problems.

(Industrial Application Field) This invention applies to machine tools,
The present invention relates to a holder for holding a tool such as a drill or a workpiece to be processed.

(Prior art) An appropriate angle of inclination is formed between the clamping cylinder on which the object to be held, such as a tool or workpiece, is attached, and the rotary cylinder fitted therewith, although the axis 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 rotary tube.

(Problems to be Solved by the Invention) This invention, except for the above-mentioned conventional problems, requires only a small force to rotate the rotary tube, and moreover, it can firmly hold the object when it is tightened. It is an object of the present invention to provide such a holder.

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention takes the measures as described in the claims above, and its effects are as follows.

(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 tube is compressed, the plurality of grooves formed on the inner circumferential surface facilitate the contraction of the fastening tube. In addition, when a large torsional force is applied to the object to be held while the object is being held tightly, the parts of the inner circumferential surface of the tightening tube that are in pressure contact with the object are The back side is supported by a thick-walled cylindrical part (thickness between the groove bottom and the outer circumferential surface of the fastening cylinder) that is integrated all around the circumference, and each of these parts has both ends on the opening side and the deep side, respectively. Since it is supported by the reinforcing portion, the rigidity of the locking tube against the above twisting force is extremely high.

(Example) Below, drawings showing examples of the present invention will be described. 1 is the main body, and 2 is a connecting part provided at the base, which is a part that is attached to the spindle of a machine tool. 3
A fastening cylinder is integrally connected to one end of the main body 1 and is configured to be elastically deformable in the radial direction, and has an insertion hole 4 inside for inserting an object to be held. 5 indicates a fitting surface on the inner circumferential surface of the fastening tube 3. Reference numeral 7 indicates the outer circumferential surface of the fastening tube 3, which is formed into a tapered shape that is thicker on the connecting portion 2 side. 10° 10... are grooves formed in the inner circumferential surface 5, each having an arcuate cross-sectional shape as shown in FIG. 2, parallel to the axis of the fastening cylinder 3, and long in the axial direction. It is. Further, the depth thereof is set to be shallow so that a large wall thickness remains between the groove bottom 10a and the outer circumferential surface 7 of the fastening cylinder 3. 11.11
. . . is a pressure contact portion between the grooves and the object to be held; 12.
Reference numeral 13 denotes annular reinforcing portions provided on the opening side and the deeper side of the groove 10, respectively, and are formed to have a uniform thickness over the entire circumference. The depth of the groove 10 is determined so that when a large torsional force is applied to the object to be held with respect to the clamping cylinder 3 in a state where each press-contact part 11 is in pressure contact with the object as described later, The large thick remaining part Job is the double-topped reinforcement part 1.
The pressure contact portion 11 is formed shallowly enough to support the pressure contact portion 11 together with 2 and 13 and prevent it from being deformed in the direction of the torsional force. The improving groove 10 may have a rectangular cross-sectional shape, and its longitudinal direction may be inclined (spiral) with respect to the axis of the fastening cylinder 3. Next, reference numeral 17 denotes a rotating cylinder, the inner circumferential surface 18 of which is formed in a tapered shape parallel to the outer circumferential surface 7. Also, a well-known spanner guide 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. As is well known, the guide tube 21 has a plurality of guide holes formed therein to form a bird cage shape, and each guide hole has a roller 24. are placed so that they can rotate freely. As is well known, these rollers 24 are aligned with respect to the central axis of the guide cylinder 21 (coinciding with the central axis of the fastening cylinder 3).
It is determined by the relationship between the twist positions at a certain angle. 25 is a rubber seal for dustproofing, 26 is a ring for holding the seal, and 27 is a circlip for preventing removal.

Next, a description will be given of an operation for holding an object to be held 31, such as a cutting tool (or a workpiece), using the holder having the above-mentioned configuration. First, the base of the cutting tool is inserted into the insertion hole 4, and the rotating barrel 17 is rotated clockwise in FIG. 2.

Then, the large number of rollers 24 are guided by the guide tube and rotate in the twisted positional relationship as described above.
By rotating the rotary tube 17, a large number of rollers 24 are moved to the outer circumferential surface 7 of the fastening tube 3 and the inner circumferential surface 1 of the rotary tube 17, respectively.
8, it moves spirally along the outer circumferential surface 7 toward the large diameter portion 8 of the fastening tube 3. 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, each pressure contact portion 11 on the fastening surface 5 comes into close contact with the outer circumferential surface of the cutting tool and firmly presses it.

When the tightening tube 3 is contracted by rotating the rotary tube 17 as described above, since the plurality of grooves 10 are formed on the inner peripheral surface of the tightening tube 3, the tightening tube 3 is compressed in the direction in which it is compressed. The fastening cylinder 3 can be elastically deformed inward with a relatively small force.

Therefore, a small force is sufficient to prevent the rotary cylinder 17 from being dented. Also, in the above case, around the base of the object to be held? +
Even if h is attached, the oil is in the above 410 ii! I
The inner circumferential surface 5 of the clamping cylinder 3 can directly mechanically contact the periphery of the object to be held, and the object to be held can be firmly tightened.

In the state where the object to be held is fastened and held as described above, by rotating the main body 1, the clamping tube 3 and the object to be held are rotated, and the object to be held is subjected to machining (for example, cutting) as is well known. Do the following. In this case, the back side of the pressure contact portion 11 is formed into a virtual cylinder (cylindrical portion) with a large wall thickness, the thickness of which is the large dimension from the groove bottom 10a to the outer circumferential surface 7.
It is supported by reinforcing parts 12 and 13 at each end on the opening side and the deep side. Therefore, even if the cutting load is large (heavy cutting) and a large torsional force is applied between the clamping cylinder 3 and the object to be held 31, the pressure contact portion 11 is prevented from deforming or displacing in the direction of the torsional force. be done.

Furthermore, even if a bending force in a direction perpendicular to the axis is applied to the object to be held in the above state, since the clamping tube 3 has the above-described structure, it will be prevented from bending in the direction of the bending force. Ru.

For these reasons, the object to be held is stably held, and as a result, processing accuracy is improved.

In addition, in the above-mentioned fastened state, the edges lla and lla on both sides of each pressure contact portion 11 can bite into the object 31 to be held, and it is possible to prevent the object to be held from slipping in the rotating direction with respect to the fastening cylinder 3. Furthermore, in the above-mentioned fastened state, even though the groove 10 is formed on the inner circumferential surface 5 of the fastening cylinder 3 as described above, the front end of the fastening cylinder 3 has an annular shape with a uniform thickness all around. Since it is a reinforcing part 12 and its inner peripheral surface is in close contact with the object to be held, when machining is performed using the object to be held (tool or workpiece), cutting debris will not fly away. Even if the reinforcement part 1
2 prevents the cutting waste from jumping into the inside of /jllio.

(Effects of the Invention) As described above, in the present invention, when it is desired to hold an object, the base of the object is inserted into the insertion hole 4 of the fastening tube 3, and the rotating tube 17 is rotated. By moving it to the larger diameter side of the fastening cylinder 3, the rotating cylinder 17 compresses the fastening cylinder 3 via the roller 24, and the inner peripheral surface 5 of the fastening cylinder 3 is compressed.
It has the advantage of being able to tighten and hold the base of the object to be held.

Moreover, by rotating the rotary cylinder 17 as described above, the tightening cylinder 3
When compressing the tightening tubes 3, the inner peripheral surface of the tightening tubes 3 is
Since a plurality of long 11 (1, 10, etc.) are formed in the axial direction of This has the effect of allowing tightening operations to be performed.

Moreover, even if the clamping tube 3 is provided with a plurality of grooves 10, 10, etc. so that it can be easily contracted as described above, the clamping tube 3 is difficult to tighten when performing heavy cutting while clamping and holding an object. When a large torsional force is applied to the held object 31 with respect to the fastening tube 3, each portion IL11... that is in pressure contact with the held object 31 on the inner circumferential surface of the fastening tube 3 has its back side Each part 11.
11... is a reinforcement part 1 at both ends of the opening side and the deep side, respectively.
2.13, the fastening cylinder 3 has an extremely high rigidity against the above-mentioned torsional force. This has the effect of preventing chatter of the object to be held 31 in the above case and improving cutting accuracy.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a half-sectional view;
FIG. 2 is a sectional view taken along the line U-U, and FIG. 3 is a side view with only the rotary cylinder partially cut away. 3... Tightening tube, 4... Insertion hole, 11... Groove, 12
, 13... Reinforcement part, 17... Rotating cylinder, 24... Roller.

Claims (1)

[Claims] It has a hollow cylindrical shape that can be elastically deformed in the radial direction, and has an inner side that is open at one end and serves as an insertion hole for the object to be held, while the outer circumferential surface has a tightening tube that is tapered. A rotary cylinder is arranged around the fastening cylinder so that it can rotate relative to each other, and
Between the outer circumferential surface of the clamping tube and the inner circumferential surface of the rotating tube, there is a section of the clamping tube so that the rotating tube can be moved in the axial direction of the clamping tube by rotating the rotating tube relative to the clamping tube. A large number of rollers each having a twisted position with respect to the axis are interposed to rotate the rotary cylinder and move it toward the larger diameter side of the fastening cylinder, thereby contracting the fastening cylinder. In a holder configured to fasten an object to be held by its inner circumferential surface, the inner circumferential surface of the fastening tube is provided with a plurality of grooves each extending in the axial direction of the fastening tube. Annular reinforcing parts of uniform thickness are formed in the circumferential direction of the fastening tube on the opening side and the deep side, respectively, and are arranged in parallel with each other, and these grooves are connected to the groove bottom and the fastening cylinder. A holder characterized in that each holder is formed shallowly so that a large wall thickness remains between the holder and the outer peripheral surface of the holder.