JP4197564B2 - Tool holding device for tool grinder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tool holding device, and more particularly, to a tool holding device used for loading a tool into a tool grinder for grinding a tool.
[0002]
[Prior art]
In general, tools used on a milling machine, drilling machine or machining center are processed with a tool grinder to perform grooving and tip machining, and repeat the machining and measurement to finish the required dimensions with high precision. Yes.
[0003]
In addition, the tool is gripped by a collet type, needle roller type, hydraulic type chuck, etc., and is mounted on the spindle of a machine tool. It was loaded on the support member.
[0004]
[Problems to be solved by the invention]
By the way, since grinding of a tool finishes processing and a measurement and it finishes to a predetermined dimension, the attachment or detachment to a tool holding member will be repeated several times, However, The tool attachment error to a chuck | zipper has a big influence on processing accuracy. With collet type and needle roller type chucks, a deflection of 5 μm or more occurred at the 4D position (distance four times the grip diameter from the mouth), and satisfactory gripping accuracy could not always be guaranteed. Moreover, the outer diameter of the tip portion that grips the tool is large, and it is necessary to grip the tool more rearward, so that it is inevitable that the processing accuracy is lowered.
[0005]
In addition, the hydraulic chuck has a gripping accuracy of about 3 μm at the 4D position, which is satisfactory in itself, but it also has a large outer diameter at the tip of the gripping part, and grips the tool by protruding forward. Therefore, it has been difficult to obtain substantial gripping accuracy. Furthermore, since the hydraulic chuck is gripped by fluid pressure, the gripping rigidity is low, and this makes it impossible to handle the processing load from a cylindrical tool material.
[0006]
Accordingly, an object of the present invention is to provide a tool holding device for a tool grinder capable of grinding a tool with high accuracy.
[0007]
Another object of the present invention is to provide a tool holding device that can easily remove a tool loaded on a tool grinder.
[0008]
Configuration, operation and effect of the invention
In order to achieve the above object, a tool holding device for a tool grinder according to the present invention has a chuck portion for gripping a shank portion of a tool by a shrink-fit method at a front portion, and a gripping portion having a tapered shank portion at a rear portion. A member, a sleeve whose inner peripheral surface is a tapered surface for holding the tapered shank portion of the gripping member, and whose outer peripheral surface is a tapered surface for mounting on a tool support member of a tool grinder, and from the rear A sleeve fixing bolt that is screwed to the rear part of the sleeve to fix the sleeve to the tool support member, and is inserted into the center hole of the sleeve fixing bolt from the rear and screwed to the rear part of the gripping member, and the gripping member is attached to the sleeve And a holding member fixing bolt for fixing to the head.
[0009]
In the tool holding device configured as described above, a shrink-fitting chuck means is employed as a gripping member for gripping the tool. The shrink-fitting method is a detachable method that utilizes the thermal expansion of metal, and the gripping accuracy can ensure about 3 μm at the 4D position. In addition, the outer diameter of the tip of the chuck portion can be made extremely small, the amount of protrusion of the tool can be small, and the substantial gripping accuracy is improved.
[0010]
Furthermore, in the tool holding device according to the present invention, a shaft member may be extended to the rear portion of the gripping member fixing bolt, and a weight may be attached to the shaft member so as to be movable in the axial direction. Since the gripping member has a tapered shank portion fixed to the inner peripheral tapered surface of the sleeve by pressing, a so-called biting phenomenon occurs, and the gripping member cannot be easily detached only by applying a static pressing force. Therefore, when the impact force is applied to the gripping member via the gripping member fixing bolt by hitting the weight from the rear, the gripping member is easily detached from the sleeve.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a tool holding device for a tool grinder according to the present invention will be described with reference to the accompanying drawings.
[0012]
FIG. 1 shows an embodiment of the present invention, and this tool holding device is roughly composed of a gripping member 1, a sleeve 5, a sleeve fixing bolt 10, and a gripping member fixing bolt 15. Reference numeral 25 denotes a tool to be ground, and reference numeral 30 denotes a tool support member of a tool grinder. The tool support member 30 is attached to a work head (not shown) via a bearing so as to be rotationally driven, and the tool grinder itself is well known.
[0013]
In the following description, the arrow A direction side is referred to as a front portion, and the opposite side is referred to as a rear portion.
[0014]
The gripping member 1 has a chuck part 2 for gripping the shank part 26 of the tool 25 by shrink fitting at the front part, has a tapered shank part 3 at the rear part, and has an internal thread 4 formed thereon. The method of fixing the tool 25 to the chuck portion 2 by shrink fitting and removing it is well known in the art, and the description thereof is omitted.
[0015]
In the sleeve 5, the inner peripheral surface is a tapered surface 6 for holding the tapered shank portion 3 of the gripping member 1, and the outer peripheral surface is a tapered surface 7 for mounting in the tapered hole 31 of the tool support member 30, An internal thread 8 is formed at the rear part.
[0016]
The sleeve fixing bolt 10 has a center hole 11, a male screw 12, and a stepped surface 13. The sleeve fixing bolt 10 is inserted into the center hole 32 of the tool support member 30 from behind and the male screw 12 is screwed onto the female screw 8 of the sleeve 5. Is fixed to the tool support member 30.
[0017]
Gripping member fixing bolt 15 has external threads 16 and the handle 17, the sleeve gripping member 1 by screwing from behind the center hole 11 of the sleeves fixing bolt 10 into the female thread 4 of the insert has been bunch support member 1 Fix to 5. The handle 17 is integrated with the bolt 15 via a key 18 so as not to be relatively rotatable. Further, the bolt 15 has a shaft member 21 extending rearward, and a weight 23 is attached to the shaft member 21 so as to be movable in the axial direction.
[0018]
Next, the usage method of the tool holding apparatus which consists of the above structure is demonstrated in order of a process.
[0019]
(1) The sleeve 5 is inserted into the tapered hole 31 of the tool support member 30.
[0020]
(2) The sleeve fixing bolt 10 is inserted into the center hole 32 of the tool support member 30 from the rear, and the male screw 12 is screwed onto the female screw 8 of the sleeve 5 and tightened, whereby the sleeve 5 is pulled back and the tool support member 30 is inserted. Secure to. The bolt 10 is tightened by engaging a wrench or the like (not shown) with the outer peripheral surface recess 14, and the stepped surface 13 abuts against the rear end surface of the tool support member 30, so that the taper surface 7 of the sleeve 5 is moved to the tool support member 30. Crimp to the taper hole 31.
[0021]
(3) Insert the tapered shank portion 3 of the gripping member 1 into the tapered surface 6 of the sleeve 5. At this time, the shank portion 26 of the tool 25 is already gripped by the shrink-fit type in a state where a predetermined dimension is inserted into the chuck portion 2 of the gripping member 1.
[0022]
(4) The gripping member fixing bolt 15 is inserted into the center hole 11 of the sleeve fixing bolt 10, and the male screw 16 is screwed onto the female screw 4 of the gripping member 1 and tightened, whereby the gripping member 1 is pulled back to the sleeve 5. Fix it. The bolt 15 is tightened by rotating the handle 17, and the handle 17 abuts against the rear end surface of the sleeve fixing bolt 10, thereby pressing the tapered shank portion 3 of the gripping member 1 against the tapered surface 6 of the sleeve 5.
[0023]
The tool 25 is attached to the tool support member 30 through the above steps (1) to (4), and grinding (grooving, tip processing, etc.) is performed on the tool 25 by the grindstone 35 or the like.
[0024]
When the predetermined processing is completed, the gripping member 1 is removed from the tool support member 30. At this time, the handle 17 is reversed to loosen the gripping member fixing bolt 15. The gripping member 1 has a so-called biting phenomenon because the tapered shank portion 3 is pressure-bonded to the tapered surface 6 of the sleeve 5 and cannot be easily detached only by applying a static pressing force. Therefore, when the weight 23 is struck from the rear and collides with the stepped portion 22 of the shaft member 21, an impact force acts on the gripping member 1 via the gripping member fixing bolt 15, and the gripping member 1 is easily detached from the sleeve 5. .
[0025]
As shown in FIG. 2, the holding member 1 removed from the sleeve 5 is fixed by screwing a fixing bolt 41 to the female screw 4 to the measuring jig main body 40 while holding the tool 25. In this state, the measuring jig body 40 is placed on the V block, and the tool 25 is measured.
[0026]
When the tool 25 is an end mill, groove processing, outer peripheral blade processing, and bottom blade processing are required. When the tool 25 is a drill, groove and second chamfer surface processing and tip end processing are required. Therefore, the holding member 1 is attached to and detached from the tool support member 30 (sleeve 5) for each necessary process. In this case, the tool 25 remains fixed to the gripping member 1 by shrink fitting, and high-accuracy machining is achieved without variation in mounting accuracy for each machining. Further, the advantage of the shrink-fitting type, that is, the gripping accuracy is good, and the outer diameter of the tip portion of the chuck portion 2 is small, so that the projection amount of the tool at the time of processing is small, and the substantial gripping accuracy is improved. We enjoy the advantages such as.
[0027]
The tool holding device for a tool grinder according to the present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the gist thereof.
[0028]
For example, the configuration for tightening the sleeve fixing bolt and the gripping member fixing bolt is arbitrary. In addition, the sliding weight is not always necessary.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a tool holding device for a tool grinder according to the present invention.
FIG. 2 is a cross-sectional view showing a state in which a part of the tool holding device is detached from a tool grinder and attached to a measurement jig body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Holding member 2 ... Chuck part 3 ... Tapered shank part 5 ... Sleeve 6, 7 ... Tapered surface 10 ... Sleeve fixing bolt 11 ... Center hole 15 ... Holding member fixing bolt 21 ... Shaft member 23 ... Weight 25 ... Tool 26 ... Shank 30 ... Tool support member 35 ... Whetstone

Claims (2)

A gripping member having a chuck portion that grips the shank portion of the tool by a shrink-fit method at the front portion, and a tapered shank portion at the rear portion;
A sleeve whose inner peripheral surface is a tapered surface for holding the tapered shank portion of the gripping member, and whose outer peripheral surface is a tapered surface for mounting on a tool support member of a tool grinder;
A sleeve fixing bolt that is screwed onto the rear portion of the sleeve from behind to fix the sleeve to the tool support member;
A gripping member fixed bolt is inserted into the center hole of the sleeve fixing bolts screwed from the rear to the rear of the gripping member, to secure the gripping member to said sleeve,
A tool holding device for a tool grinder characterized by comprising:   The tool holding device for a tool grinder according to claim 1, wherein a shaft member is extended to a rear portion of the holding member fixing bolt, and a weight is attached to the shaft member so as to be movable in the axial direction.

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