JP2001310228A - Tool holder and installing method of tool holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool holder devised so that an overall surface of an outer peripheral surface 10a of a shank part 10 on a main body 6 makes contact with an overall surface of an inner peripheral surface 3a of a tapered hole 3 and both of them rotate in an integrated state even when the side of an opening part 8 of a spindle 2 receives work of centrifugal force and extends in the case of rotating the spindle 2 at high rotating speed suitable for working. SOLUTION: An inclined shape of the outer peripheral surface 10a of the shank part is made larger inclination than inclination of the tapered hole so that an outer peripheral surface 10c of the shank part makes closely contact with an inner peripheral surface 3C on the side near to the opening part 8 on the tapered hole, but an outer peripheral surface 10b of the deep part side of the shank part is separated with a clearance from an inner peripheral surface 3b on the deep part side on the tapered hole or it comes to be in a degree to make lightly contact with it in a state before rotation when the shank part 3 is finished installing on the tapered hole 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder and a method for mounting the tool holder, which are used when tools having different dimensions are interchangeably mounted on a machine tool.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional tool holder which has been widely known (for example, Japanese Patent Application Laid-Open No.
96436). In FIG. 2, reference numerals 1 to 4 denote well-known configurations of a machine tool, 1 is a frame, 2 is a rotatable main shaft, and 3 is a tapered hole for mounting a holder. As is well known, the inclination of the peripheral surface is determined so as to conform to an industrial standard. Reference numeral 4 denotes a pulling tool. Next, in the holder 5, reference numeral 6 denotes a main body, and reference numeral 7 denotes a tool holder provided at one end of the main body 6 in the direction of the axis 2b, for example, a well-known chuck (not shown) which allows a drill having an arbitrary thickness to be detachably mounted. ) Is the support member 14 in the tool holder.
An example is shown at the tip of FIG. The base of the support member 14 is fixed to the opening side 15 of the flange portion 17 using a fixing screw 16 so as to be replaceable. Reference numeral 10 denotes a shank portion provided at the other end of the main body 6 in the axial direction. The outer peripheral surface 10a conforms to the industrial standard similarly to the inclination of the inner peripheral surface of the tapered hole 3. It is formed in a corresponding tapered shape so that the entire surface comes into close contact with the device. Numeral 11 denotes a hollow portion inside the hollow portion, and the outer periphery 10a is formed on the inner peripheral surface 3a of the tapered hole 3.
The effect of elastically pressing against is produced. Reference numeral 12 denotes a well-known pull stud provided at the tip of the shank portion 10. When a plurality of tools (for example, a plurality of drills having different thicknesses) of different sizes are exchangeably mounted on a machine tool, this type of tool holder 5 attaches the tools of the respective sizes to each other as described above. A plurality of tool holders 5 having the configuration are mounted in advance, and they are arranged in a tool holder and prepared. Then, by selecting a tool having a desired size from a large number of the prepared tool holders 5 and mounting it on a machine tool, a tool of any size can be mounted in exactly the same operation. There is.

[0003] However, as shown in FIG.
The shank portion 10 of the tool holder on which the tool is mounted is inserted, and the pull stud 12 is pulled with a resilient attraction 4
And the outer peripheral surface 10a of the shank portion is brought into close contact with the inner peripheral surface 3a of the tapered hole to prepare for operation.
In this state, the contact surface 2 on the spindle 2
The abutment surface 20 of the flange portion 17 may abut against a depending on various models, may leave a slight gap, or may have an elastic member interposed therebetween. Next, the spindle 2 is subsequently rotated at a high speed.
When the rotation speed is 5000 to 10000 rotations (per minute), the shaft core 6a of the main body 6 rotates properly with the shaft core 2b of the main shaft 2 without any center runout.

[0004]

However, in this conventional tool holder, the rotational speed of the main shaft is gradually increased to 1500.
0, or 2 to 40,000 revolutions per minute (per minute)
As the rotation speed is increased toward, the large-diameter portion 2d on the tip end side of the main shaft 2, that is, the opening 8 side is greatly expanded by the action of the centrifugal force as shown in FIG. On the other hand, the side in contact with the outer periphery 10b of the deep portion of the shank portion 10, that is, the side of the deeper inner peripheral surface 3b of the small-diameter tapered hole maintains the contact state in contact with the deep portion 10b of the shank portion 10 without relatively expanding. Therefore, the side 10c of the shank portion 10 close to the opening 8 corresponds to FIG.
As shown in the figure, the side near the opening of the tapered hole is expanded, so that a gap 9 is formed between the two without contacting the inner peripheral surface 3c as shown in the figure. In such a state, continue high-speed rotation,
If the processing operation is continued, the bending rigidity of the main body 6 becomes weak, and there is a problem that chatter commonly occurs. In addition, the mounting accuracy of the main body with respect to the main shaft 2 is deteriorated, and the shaft core 6a of the main body 6 has a run-out relative to the shaft core 2b, and there is a problem that defective machining is generated.

[0005] The tool holder of the present application is provided to solve the above-mentioned problems of the prior art. The object of the present application is to provide a large-diameter portion 2d of the opening of the main spindle in the case where the main spindle is rotated at a high rotation speed suitable for machining, from the above-described circumstances.
Side is greatly affected by the effect of centrifugal force, and even if it expands, the entire outer peripheral surface of the shank portion of the main body abuts the entire inner peripheral surface of the tapered hole so that both are ideally integrated. It is intended to provide a tool holder. Another object is to mount the shank portion of the main body in the tapered hole of the main shaft by mounting the deep outer peripheral surface of the shank portion and the deep inner peripheral surface of the tapered hole lightly or slightly apart from each other. The outer peripheral surface on the opening side and the inner peripheral surface on the opening side of the tapered hole are mounted so that they are tightly and in a normal state, and when the main shaft is rotated at high speed, the entire outer peripheral surface of the shank portion in the main body is
It is an object of the present invention to provide a method of mounting a tool holder on a main shaft, which abuts on the entire inner peripheral surface of a tapered hole so that both are ideally integrated. Other objects and advantages will be more readily apparent from the drawings and the following description associated therewith.

[0006]

According to the present invention, there is provided a tool holder provided with a tool holder at one end in an axial direction of a main body.
The other end of the main body in the axial direction has a corresponding tapered shank portion fitted to a tapered hole provided at an end of the main shaft of the machine tool. The shape of the slope of the surface is such that in the state before the rotation in which the shank portion is mounted on the tapered hole, the outer peripheral surface of the shank portion is in close contact with the inner peripheral surface on the side closer to the opening in the tapered hole, but in the tapered hole, The inclination of the tapered hole is greater than the inclination of the tapered hole so that the outer peripheral surface on the deep side of the shank portion is separated from the inner peripheral surface on the deeper side by a distance or slightly touches.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, the functions, properties, characteristics, and the like of the components and members and the like denoted by the same reference numerals as those in FIGS. 2 and 3 are the same as those of the components described below except for new members, configurations, combinations, and the like. It can be understood that this is the same as the description given above, and a duplicate description will be omitted below.

The tool holder shown in FIG. 1 is provided with a tool holding portion 7 for detachably holding a blade at one end of the main body 6 in the direction of the axis 6a. Spindle 2
The shank portion 10 has a corresponding tapered shape to be fitted into the tapered hole 3 provided at the end of the shank. The shape of the inclination of the outer peripheral surface 10a of the shank portion 10, that is, the angle with respect to the axis 6a, depends on the relationship that the inclination of the inner peripheral surface of the tapered hole 3 is formed so as to conform to the industrial standard. The slope of 10a is a value slightly larger than the value specified in the industrial standard. That is,
In the state where the shank portion 10 has been mounted on the tapered hole 3 in the state of FIG. 1A (the state immediately before rotation), the inner peripheral surface 3c of the large diameter portion 2d of the tapered hole 3 near the opening 8 The outer peripheral surface 10c of the shank portion is in close contact with the pressure contact, but the inner peripheral surface 3 of the small diameter portion 2e on the deeper side of the tapered hole.
The outer peripheral surface 10b on the deeper side of the shank portion is separated from the inner peripheral surface 3a of the tapered hole 3 by a larger angle than that of the inner peripheral surface 3a of the tapered hole 3 so that the outer peripheral surface 10b separates the minute gap 9a or makes light contact. is there.

In the above configuration, FIG.
As shown in (B), a shank portion 10 having a corresponding tapered shape is provided so as to fit into a tapered hole 3 provided at an end of a main shaft 2 of a machine tool, and a pulling tool provided at an end of the main shaft. 4, the main body 6 is pulled through the pull stud 12,
The shank 10 is mounted in the tapered hole 3 as shown in the figure. In this state, the outer peripheral surface 10c of the shank portion is strongly brought into close contact with the inner peripheral surface 3c of the tapered hole 3 on the side closer to the opening portion 8, and the shank portion is brought into contact with the inner peripheral surface 3b of the tapered hole 3 on the deeper side. The outer peripheral surface 10b on the deeper side is mounted so as to leave a small gap or to make light contact.

Next, as the main shaft 2 is rotated at a high speed and the speed gradually increases (for example, increases at 15000 revolutions / minute), the inner periphery of the large diameter portion 2d on the opening 8 side of the main shaft 2 is increased. The surface 3C slightly expands under the action of the centrifugal force (for example, when the surface 3C rises at 15000 revolutions / minute, the inner diameter of the inner peripheral surface 3c near the opening 8 expands by about 10 microns). Then, the main body 6, which has been subjected to the force in the direction of being pulled by the pulling tool 4, moves slightly inward along the inner peripheral surface 3a of the tapered hole 3 of the main shaft 2, and opens at the tapered hole. The outer peripheral surface 10c of the shank portion is brought into close contact with the inner peripheral surface 3c on the side closer to the portion 8 in a press-contact state, and the outer peripheral surface 10b on the deeper side of the shank portion is also contacted with the inner peripheral surface 3b on the deeper side of the tapered hole. In a pressed state. As a result, the axis 2b of the main shaft 2 and the axis 6a of the main body 6 of the tool holder coincide with each other, and the main shaft 2 and the main body 6 of the tool holder are integrated, and the rigidity of both is extremely good. And the mounting accuracy is high.

The rotation speed of the spindle 2 may be used for machining at a speed higher than the above-mentioned speed. In such a case, the expanded dimension of the inner peripheral surface of the tapered hole 3 on the side closer to the opening 8 is known in advance in accordance with the expected speed, and the outer peripheral surface 10a of the shank portion corresponding thereto is known.
Is preferably increased by an amount corresponding to the expansion of the inner peripheral surface 3c on the side closer to the opening 8 in the tapered hole 3. By doing so, the rotation speed of the main shaft 2 is further increased, and the degree of expansion of the inner peripheral surface 3c on the side close to the opening 8 is slightly increased. The inclined surface of the outer peripheral surface 10a of the shank portion corresponding to the above has a good adhesion between the two inclined surfaces as the shank portion is retracted by the pulling tool and the main body slightly moves, and the integration of the two is very good. It can be something. When the outer peripheral shape (inclination angle) of the shank portion of the main body 6 is appropriately set variously in accordance with the rotation speed of the main shaft 2 so as to improve the integration of the two as described above, the set inclination angle is minute. And it is difficult to make a visual determination. For this reason, the degree of inclination of the outer peripheral surface 10 a of the shank portion 10, which is greater than the inclination of the tapered hole 3 in the body 6 of the tool holder, means the number of rotations of the tool holder 5. It is good to display by a number, abbreviation, or symbol. This means that, instead of the inclination angle of the outer peripheral surface 10a of the shank portion 10, the "optimum use rotational speed" can be understood by the operator, for example, as shown in FIG. The optimum rotation speed for one part 21 of the outer circumference of
It may be displayed in an abbreviation such as "man" or a symbol such as "II". Then, when rotating the main spindle at 20000 revolutions / minute and when rotating the main spindle at 30000 revolutions / minute, the inner peripheral surface 3c of the large diameter portion 2d on the side closer to the opening 8 in the tapered hole 3 is required. The number of rotations corresponding to the rotation speed is displayed with or without understanding that the degree of expansion is different, for example, “200
By selecting and using a tool holder indicating the number of rotations to be used, such as "00 RPM" or "30000 RPM", it is possible to use the tool holder in a state where both are integrated.

[0012]

As described above, according to the present invention, even when the main spindle 2 is rotated at a high rotational speed suitable for machining, the main shaft opening 8 side is greatly affected by centrifugal force and expands. The shape of the outer peripheral surface of the shank portion 10 is such that the outer peripheral surface 10C of the shank portion is in close contact with the inner peripheral surface 3C of the tapered hole 3 on the side closer to the opening, but the inner peripheral surface 3b on the deeper side of the tapered hole. On the other hand, the outer peripheral surface 10b on the deep side of the shank portion has a larger inclination than the inclination of the tapered hole so that the outer peripheral surface 10b is separated from the gap or slightly touched.
The entire surface of the outer peripheral surface of the shank portion 10 is in contact with the entire surface of the inner peripheral surface of the tapered hole, and the two are ideally integrated, exhibiting extremely good rigidity, and also have excellent cutting accuracy. There is also an effect.

[Brief description of the drawings]

FIG. 1A is a partially broken view showing a state where a shank portion of a main body is mounted on a main shaft. (B) is a partial cutaway view showing a state where the shank portion of the main body is mounted on the main shaft and the main shaft is in a high-speed rotation state.

FIG. 2 is a partial cutaway view of a conventional example showing a state where a shank portion of a main body is mounted on a main shaft.

FIG. 3 is a partially broken view of a conventional example showing a state in which a shank portion of a main body is mounted on a main shaft to be in a high-speed rotation state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Frame, 2 ... Main shaft, 3 ... Taper hole, 4 ... Pulling tool, 5 ... Tool holder, 6 ... Main body, 7 ... Tool holding part, 8 ..Opening, 9 gap, 10 shank, 12 pull stud,
17 ... flange, 18 ... concave groove

Claims (4)

[Claims] A tool holding portion is provided at one end in the axial direction of the main body, and a tool holding portion is fitted at the other end in the axial direction of the main body into a tapered hole provided at an end of a main shaft of a machine tool. In the tool holder having a tapered shank portion, the shape of the inclination of the outer peripheral surface of the shank portion is close to the opening in the tapered hole in a state before the rotation where the shank portion is completely mounted on the tapered hole. The outer peripheral surface of the shank portion is in close contact with the inner peripheral surface of the side, but the outer peripheral surface of the deep portion of the shank portion is slightly separated from the inner peripheral surface of the shank portion with the inner peripheral surface of the tapered hole. A tool holder characterized in that the inclination is greater than the inclination of the tapered hole. 2. A tool holding portion is provided at one end in the axial direction of the main body, and the other end in the axial direction of the main body is fitted into a tapered hole provided at an end of the main shaft of the machine tool. In a method for mounting a tool holder having a tapered shank portion into a tapered hole provided at an end of a main spindle, a shank is provided on an inner peripheral surface of the tapered hole on a side near an opening. The outer peripheral surface of the shank is closely attached to the inner peripheral surface on the deeper side of the tapered hole, or the outer peripheral surface of the deeper side of the shank is mounted so that the outer peripheral surface is lightly contacted. As the opening side of the main shaft is expanded by rotating, the outer peripheral surface of the shank portion is brought into close contact with the inner peripheral surface of the tapered hole near the opening, and the inner peripheral surface of the tapered hole on the deeper side. The outer peripheral surface on the deep side of the shank Is deposited, a method of mounting the tool holder with respect to the main shaft, characterized in that so as to integrate the main body of the spindle and the tool holder. 3. The tool holder main body has a number, abbreviation, and abbreviation that indicate the number of rotations of the tool holder, the degree of inclination of the outer peripheral surface of the shank portion that is greater than the inclination of the tapered hole. 2. A display as a symbol.
Tool holder as described. 4. The main body of the tool holder used in the method of mounting the tool holder, the degree of inclination of the outer peripheral surface of the shank portion, which is greater than the inclination of the tapered hole, is determined. 3. The method for mounting a tool holder according to claim 2, wherein a tool holder indicated by a number, an abbreviation, or a symbol indicating the number of rotations used is used.