JP2004001104A - Chuck device and tightener for chuck device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly practical chuck which prevents catching and breaking of an engaged part by reducing the friction resistance without using a lubricating oil in the engaged part, and thereby improving the tool clamping force by a clamper. <P>SOLUTION: A tool 5 is mounted on a tool holder 1. In the chuck device, the tool 5 is clamped by expanding/contracting the clamper 4 mounted inside the tool holder 1 with the rotation of a tightener 2 engaged with the tool holder 1. A coating with the friction coefficient as small as possible is applied to the engaged part of the tightener 2 with the tool holder 1. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a chuck device for holding a tool such as a drill and an end mill, and a fastener for the chuck device.
[0002]
Problems to be solved by the prior art and the invention
As a chuck device, a tool holder having a tapered hole, a shank portion at a base end portion, and a holding member (a collet or the like) having an opening at a distal end portion inserted into the tapered hole. And a tightening cylinder which is screwed into the tool holding body. The rotation of the tightening cylinder causes the holding body to slide in the tapered hole to expand and contract, and the tool is held by the expansion and contraction. Or there is a type to release.
[0003]
In this type, the degree of screwing between the tightening cylinder and the tool holder is important. This is because, when the degree of screwing is poor, problems such as misalignment of the tool and insufficient gripping force of the tool occur.
[0004]
Therefore, in this screwing means, a configuration is employed in which so-called "play" is small between the thread on the tightening cylinder side and the thread on the tool holder side.
[0005]
However, if there is little "play", the frictional resistance (rotational resistance) increases when the tightening cylinder is rotated, and the screw threads bite or break due to the vibration when rotating the tool. Easy to occur.
[0006]
Therefore, lubricating oil is often applied to the threaded portion in order to reduce frictional resistance as much as possible.
[0007]
By the way, chuck devices are often used for processing electronic components. Then, when the above-mentioned lubricating oil applying means is employed in the processing of this electronic component, the following problems occur.
[0008]
In processing electronic components, oil must be prevented from adhering to the electronic components in order to maintain electrical characteristics. Therefore, lubricating oil cannot be applied to the threaded portion of the chuck device (when lubricating oil is applied, the lubricating oil may be scattered when the chuck device rotates).
[0009]
Therefore, since lubricating oil cannot be used, as described above, frictional resistance is increased, and thread biting or damage is extremely likely to occur at the threaded portion between the tightening cylinder and the tool holder. .
[0010]
The present invention has confirmed that the frictional resistance is reduced without using a lubricating oil in the threaded portion to prevent the threaded portion from biting or being damaged, thereby improving the clamping force of the tool by the clamping body. It is intended to provide a chuck which has been completed and is excellent in practicality.
[0011]
[Means for Solving the Problems]
The gist of the present invention will be described with reference to the accompanying drawings.
[0012]
A chuck device for mounting a tool 5 on a tool holder 1 and expanding and contracting a holding body 4 contained in the tool holding body 1 by turning a fastening body 2 screwed to the tool holding body 1 to hold the tool 5 The present invention relates to a chuck device, wherein a screwing portion between the fastening body 2 and the tool holder 1 is coated with a coating having a friction coefficient as small as possible.
[0013]
The chuck device according to claim 1, wherein only a portion of the tightening body 2 that is screwed to the tool holder 1 is coated with a friction coefficient as small as possible. It is related.
[0014]
In addition, in the chuck device according to any one of claims 1 and 2, a male screw portion 6 is provided on an outer peripheral surface on a distal end side of the tool holder 1, and the male screw portion 6 has a cylindrical fastening member. The tool holder 1 is provided with a tapered hole 3 having an opening at the tip and having a large diameter at the opening side. The tapered hole 3 has a large diameter at the tip end. A cylindrical holding body 4 is inserted, slits 8 are arranged in the holding body 4 at predetermined intervals in a radial direction, and the clamping body 2 is provided with the holding body 4 of the tool holding body 1. A pushing portion 18 is provided to be pushed to the base end side, and the pushing body 18 is moved to the base end side of the tool holder 1 by the rotation of the fastening body 2, whereby the pushing portion 18 is held by the pinch. The body 4 is pushed toward the base end side of the tool holder 1 in the tapered hole 3 and the taper action of the tapered hole 3 and the slit 8 Those of the chuck device being characterized in that it is configured to sandwich the tool 5 more 該挟 bearing member 4 is reduced in diameter.
[0015]
Further, in the chuck device according to the third aspect, a concave groove 9 is provided on the outer peripheral surface on the distal end side of the holding body 4, and an insertion convex portion 10 inserted into the concave groove 9 is provided on the fastening body 2. The insertion protrusion 10 pulls out the holding body 4 from the tapered hole 3 by moving the fastening body 2 to the tip side of the tool holder 1 by rotating the fastening body 2. The present invention relates to a chuck device characterized by the above.
[0016]
Further, in the chuck device according to any one of claims 3 and 4, the slit 8 has a slit 8 and a base opening extending from the distal opening side of the cylindrical holding body 4 to the base opening side. The present invention relates to a chuck device characterized in that slits 8 extending from the part side to the tip opening side are provided alternately.
[0017]
Further, in the chuck device according to any one of claims 1 to 5, the tool holder 1 and the tightening member 2 are each made of a metal, and are related to the chuck device.
[0018]
Further, in the chuck device according to any one of claims 1 to 6, a shank portion 13 which is connectable to a rotary machining device for rotating the tool holder 1 is provided at a base end portion of the tool holder 1. The present invention relates to a chuck device characterized in that:
[0019]
Further, a holding body 4 is provided in a tapered hole 3 provided in the tool holding body 1, a tool 5 is inserted into the holding body 4, and the holding body 4 is slidably moved in the tapered hole 3 to expand and contract. A clamping body used in a chuck device having a structure in which a tool 5 is clamped by a body 4, wherein the clamping body 2 is a cylindrical body fitted on the tool holding body 1, and has a tool holding body on its inner surface. 1 and a pushing portion 18 for pushing the holding member 4 toward the base end side of the tapered hole 3. Further, the tightening member 2 is screwed so that the tool holder 1 is screwed. The female screw portion 7 is coated with a coating having a coefficient of friction as small as possible, and relates to a fastener for a chuck device.
[0020]
Function and effect of the present invention
When a coating having a friction coefficient as small as possible is applied to the screwing portion between the tightening body 2 and the tool holder 1, the tightening body 2 is repeatedly rotated (screwed) without applying oil to the screwing portion. ), It was confirmed that the tool 5 could be repeatedly and satisfactorily held by the holding body 4 without biting or damage occurring at the screwed portion.
[0021]
In addition, it was confirmed that in the case where the coating was applied, the holding force of the tool 5 by the holding body 4 was improved. This is because the coating reduces the coefficient of friction of the threaded part, so that the rotation of the tightening body 2 can be maximized until the tightening body 2 can no longer rotate, and thus the tightening body It is presumed that the reason is that the diameter of the holding body 4 is favorably reduced by the rotation of 2.
[0022]
Since the present invention is configured as described above, even if the rotating body is repeatedly rotated and used, the threaded portion does not bite or break, and the tool is strongly sandwiched and the good performance by the tool is achieved. It becomes a chuck device with excellent practicality and durability that can perform machining.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
The drawings illustrate one embodiment of the present invention and will be described below.
[0024]
In the present embodiment, a tool 5 is provided on a tool holder 1, and a holding body 4 provided in the tool holder 1 is expanded and contracted by rotation of a tightening body 2 screwed to the tool holder 1, and the tool 5 is enlarged. This is a chuck device for holding the sheet.
[0025]
The tool holder 1 has a through hole 21, a male screw portion 6 is provided on the outer peripheral surface at the distal end, a shank portion 13 is provided at the base end portion, and near the center of the through hole 21. Is screwed with a protruding amount setting portion 12 which abuts on the base end portion of the tool 5 to appropriately determine the protruding amount of the tool 5 from the tool holder 1. A pull stud 14 is screwed into the portion.
[0026]
The tip end of the through hole 21 of the tool holder 1 is set to a tapered hole 3 having a large diameter at the tip opening side, and a cylindrical holding body 4 having a large diameter at the tip side is formed in the tapered hole 3. Has been inserted.
[0027]
Slits 8 are arranged in the holding body 4 at predetermined intervals in the radial direction. The holding body 4 can be reduced in diameter by the presence of the slit 8, and is configured to hold the tool 5 on the inner surface of the holding body 4 when the diameter is reduced.
[0028]
The slits 8 are arranged such that the slits 8 extending from the distal opening side to the proximal opening side of the cylindrical holding body 4 and the slits 8 extending from the proximal opening side to the distal opening side alternately. It is provided to be.
[0029]
In addition, a large-diameter hole 11 is provided in the slit 8 at the end opposite to the opening of the holding body 4. Therefore, the space between the slits 8 (reference numeral 19 in the figure) of the holding body 4 becomes narrow in the vicinity of the large-diameter hole 11, so that it is possible to bend inward satisfactorily and the tool 5 is held by the holding body 4. The action is well exhibited.
[0030]
A concave groove 9 is provided at a position on the distal end side outer peripheral surface of the holding body 4 and exposed from the distal end of the tapered hole 3.
[0031]
Further, a tapered surface 20 of which the diameter gradually decreases toward the distal end side is provided on the outer peripheral surface of the clamp body 4 closer to the distal end side than the concave groove 9.
[0032]
The tightening body 2 has a cylindrical shape fitted on the outer peripheral surface of the tip of the tool holder 1.
[0033]
On the inner surface of the tightening body 2, a female screw portion 7 screwed with the male screw portion 6 is provided.
[0034]
A ring member 17 is rotatably provided at a base end of the inner surface of the tightening body 2 via a rolling element 16 (ball).
[0035]
At the base end of the inner surface of the ring member 17, an insertion convex portion 10 inserted into the concave groove 9 of the holding body 4 is set.
[0036]
Further, a pushing portion 18 that protrudes from the inner surface of the ring member 17 to abut the tapered surface 20 of the holding member 4 to push the holding member 4 toward the base end of the tool holder 1 is provided. ing.
[0037]
When the tightening body 2 having this configuration is rotated, the tightening body 2 moves along the tool holder 1 to the proximal side or the distal side of the tool holder 1.
[0038]
When the tightening body 2 is rotated and moved to the base end side of the tool holder 1, the pressing portion 18 of the ring member 17 presses the tapered surface 20 of the holding body 4 (in this case, tightening is performed). Since the body 2 and the ring member 17 are rotatable, the pushing portion 18 pushes the tapered surface 20 without rotating.) When the tapered surface 20 is pushed, the holding body 4 is pushed and pushed into the tapered hole 3, and the diameter of the holding body 4 is reduced by the taper action of the tapered hole 3, so that the tool 5 Exhibits the effect of pinching Further, when the tapered surface 20 of the holding body 4 is pushed by the pushing portion 18, the holding body 4 is also reduced in diameter by the taper action of the tapered surface 20, so that the function of holding the tool 5 is exhibited.
[0039]
When the tightening body 2 is rotated and moved to the distal end side of the tool holder 1, the contact between the pushing portion 18 of the ring member 17 and the tapered surface 20 of the holding body 4 is released, and The insertion protrusion 10 of the ring member 17 and the concave groove 9 of the holding body 4 are locked, and the holding body 4 is pulled by the insertion protrusion 10, thereby expanding the holding body 4 having been reduced in diameter. The diameter is reduced, and the holding of the tool 5 is released.
[0040]
The coating having a coefficient of friction as small as possible is provided on the female screw portion 7 of the fastening body 2 (see FIG. 3; reference numeral 15 is a coating layer).
[0041]
The coating layer 15 may be provided only on the male screw portion 6 of the tool holder 1 or may be provided on both the male screw portion 6 of the tool holder 1 and the female screw portion 7 of the fastening body 2. Although good, the structure provided only in the fastening body 2 as in this embodiment is the best. This is because the fastening body 2 has a simpler structure, so that the coating can be performed easily. Further, the tool holder 1 does not add as much as possible to the tool holder 1 for the center accuracy of the tool 5. Because it is better.
[0042]
For this coating, specifically, one having good lubricity, for example, trade name “HMB-2” (manufactured by Nippon Parker Rising Co., Ltd.) or the like is used. Incidentally, the thickness of the coating is preferably in the range of 2 to 60 μm. Also, the coating may be hard.
[0043]
By this coating, the female screw portion 7 of the tightening body 2 is not damaged, and the male screw portion 6 of the tool holder 1 screwed with the female screw portion 7 is not damaged.
[0044]
In addition, this coating enables the turning operation of the tightening body 2 to be performed smoothly, so that the holding body 4 can be smoothly slid forward and backward by the turning of the tightening body 2. , The tool 5 is satisfactorily held. According to experiments, it has been confirmed that the clamping force of the tool 5 increases to about 1.5 times.
[0045]
Since the present embodiment is configured as described above, the coating provided on the threaded portion between the tool holder 1 and the tightening body 2 prevents biting and damage of the threaded portion. Thus, the chuck device is excellent in practicality and can be used for a long time while repeatedly holding the tool 5.
[0046]
Further, the rotation of the tightening body 2 can be performed satisfactorily, whereby the rotation resistance is reduced, and the holding body 4 can be slid in the tapered hole 3 satisfactorily. As a result, the chucking force can be favorably converted to a chucking force, and the chuck device can hold the tool 5 more firmly than in the past, and is excellent in practicality.
[0047]
The coated fastener 2 can also be used for other tool holders 1, so that the existing tool holder 1 does not easily bite the threads or damage the threads. Things.
[0048]
Hereinafter, experimental results confirming the effect of the present embodiment will be described.
[0049]
On the other hand, a fastening member having a female screw portion coated thereon is screwed into a tool holder having the same shape (this embodiment), and the other screw member is screwed with an unprocessed fastening member having a female screw portion (comparative example). ), An experiment was carried out in which a tool was repeatedly held, and a rotating operation was performed with the tool (lubricating oil was not used, of course).
[0050]
The coating used was "HMB-2" (trade name, manufactured by Nippon Parker Rising Co., Ltd.). The thickness of the coating was 20 μm.
[0051]
The tightening torque of the tightening body was set to 58.8 N · m (600 kgf · cm).
[0052]
In the comparative example, the tool clamping force at the time of tightening the tightening body for the first time was 98.1 N · m (1000 kgf · cm), and when the tightening body was tightened for the ninth time, the female screw portion was damaged. Then, it became impossible to tighten.
[0053]
In this embodiment, the tool clamping force at the time of tightening the tightening body for the first time is 145.2 N · m (1480 kgf · cm). Deformation was observed, but the tightening could be performed over 350 times. In this example, the surface of the female screw portion was observed every 50 times.
[0054]
The tool clamping force in this embodiment is 127.5 N · m (1300 kgf · cm) at 100 times, 117.7 N · m (1200 kgf · cm) at 200 times, and 68.6 N · m (700 kgf at 700 times). Cm).
[0055]
From the above experimental results, it was confirmed that the present embodiment is a chuck device having a very long life and capable of strongly holding a tool for a considerably long period even when used repeatedly.
[Brief description of the drawings]
FIG. 1 is an explanatory side sectional view of this embodiment.
FIG. 2 is an explanatory enlarged sectional view of the present embodiment.
FIG. 3 is an explanatory enlarged cross-sectional view of a threaded portion of the embodiment.
FIG. 4 is an explanatory perspective view of a fastening body 2 of the present embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tool holding body 2 Tightening body 3 Taper hole 4 Nipping body 5 Tool 6 Male screw part 7 Female screw part 8 Slit 9 Depression groove 10 Insertion convex part 13 Shank part 18 Pushing part

Claims (8)

A chuck device for providing a tool on a tool holder, holding and clamping the tool by expanding and contracting a holding body provided in the tool holding body by rotation of a fastening body screwed to the tool holding body, wherein the fastening is performed. A chuck device characterized in that a threaded portion between a body and the tool holder is provided with a coating having a friction coefficient as small as possible. 2. The chuck device according to claim 1, wherein only a portion of the tightening body which is screwed to the tool holder is coated with a friction coefficient as small as possible. The chuck device according to claim 1, wherein a male screw portion is provided on an outer peripheral surface on a distal end side of the tool holder, and the male screw portion has a female screw formed in a cylindrical fastening body. The part is screwed, the tool holder has an opening at the tip and a tapered hole with a large diameter on the opening side is provided, and a cylindrical holding body with a large diameter on the tip side is inserted into this tapered hole, The holding body is provided with slits at predetermined intervals in the radial direction, and the fastening body is provided with a pushing portion for pushing the holding body toward the base end side of the tool holder. By moving the tightening body to the base end side of the tool holder by the rotation of the body, the pushing portion pushes the holding body toward the base end side of the tool holder in the tapered hole, The holding body is configured to be reduced in diameter by the taper action of the tapered hole and the slit to hold the tool. Chuck and wherein the door. 4. The chuck device according to claim 3, wherein a concave groove is provided on the outer peripheral surface on the distal end side of the holding body, and an insertion convex portion inserted into the concave groove is provided on the tightening body. The chucking device is characterized in that the insertion protrusion is configured to pull out the holding member from the tapered hole by moving the tightening member toward the tip end of the tool holder. 5. The chuck device according to claim 3, wherein the slit extends from the distal opening side to the proximal opening side of the cylindrical holding body, and the distal opening extends from the proximal opening side. 6. A slit device which is provided so that slits extended to a part side may be located alternately. The chuck device according to any one of claims 1 to 5, wherein the tool holder and the fastening body are each made of metal. The chuck device according to any one of claims 1 to 6, wherein the base end of the tool holder is provided with a shank portion that can be connected to a rotary machining device that rotates the tool holder. Chuck device. A chuck having a structure in which a holding body is internally provided in a tapered hole provided in a tool holding body, a tool is inserted into the holding body, and the holding body is slid and moved in the tapered hole to expand and contract to hold the tool with the holding body. A fastening body used in the device, wherein the fastening body is a cylindrical body fitted on the tool holder, and an inner surface of the female thread portion screwed with the tool holder and the holding body are tapered. A pushing portion for pushing is provided on the base end side of the hole, and further, the tightening body is configured to move with respect to the tool holder by screwing, and the internal thread portion has a friction coefficient as much as possible. A fastener for a chuck device, characterized in that it has a relatively small coating.

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