JP2000334622A - Tool insertion travel regulator and adjuster for same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate the projection level of tools from toolholders of a shrinkage fit type accurately and adjust the limitation level accurately and easily, via simple construction. SOLUTION: This regulator 20 limits tool insertion travel L1 into a toolholder 10 having a chuck portion 12 for holding a tool shank with a shrinkage fit. The regulator 20 comprises a limiting rod 21, an adjusting member 22 and a holding member 25. The holding member 25 has an external thread 26a that can be put in threaded engagement with an internal thread 13a in a center bore 13 of the toolholder 10. The limiting rod 21 and adjusting member 22 are fixed together, and rotating the adjusting member 22 determines the tip position of the limiting rod 21 to regulate the insertion travel L1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool insertion amount regulating tool, and more particularly to a tool for regulating the insertion amount of a tool into a shrink-fit type tool holder, and an adjusting device therefor.

[0002]

2. Description of the Related Art Conventionally, various types of tool holders used for attaching a cutting tool to a main shaft of a machine tool such as a machining center have been provided, and a shrink-fit type is known as one of them. . As shown in FIG. 7, the shrink fitting method is a detachable method that utilizes the difference in the coefficient of thermal expansion between the chuck portion 2 of the tool holder 1 and the cutting tool 5, and has a good dynamic balance for holding the cutting tool. It has the advantage that high-speed processing is possible, and has recently attracted attention.

In order to attach a tool to the shrink-fit type holder 1, it is necessary to set a predetermined protrusion amount L2 for each tool 5. As described in Japanese Patent Application Laid-Open No. H11-77443, and as shown in FIG.
A stopper 7 having a coil portion 7a corresponding to the outer diameter of the shank portion 6 of the tool 5 and a pair of grip portions 7b has been proposed. The stopper 7 is resiliently attached to the shank 6 by measuring the insertion amount L1 of the tool 5 with a caliper or a ruler. When the tool holder 1 is thermally expanded by heating and the tool 5 provided with the stopper 7 is inserted into the chuck part 2, the coil part 7 a of the stopper 7 comes into contact with the tip end surface of the holder 1, and the insertion amount L 1 is regulated. As a result, the required protrusion amount L2 is obtained.

[0004]

The stopper 5 has an advantage that it can be easily used with a simple structure, but it is necessary to mount the stopper 5 while measuring L1 each time the tool is changed, which is troublesome. Was. Also, the protrusion amount L
It was also difficult to fine-tune 2.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tool insertion amount restricting tool having a simple structure and capable of accurately restricting the amount of protrusion of a tool from a holder in a shrink fit type tool holder. is there.

It is a further object of the present invention to provide an adjusting device capable of accurately and easily adjusting the control amount by the tool insertion amount control tool.

[0007]

In order to achieve the above objects, a first tool insertion amount regulating tool according to the present invention is a tool holder having a chuck portion for holding a shank portion of a tool by shrink fitting. A restrictor for restricting the insertion amount of the tool, wherein the rear end of the center hole of the tool holder can be screwed to the center hole of the tool holder, and the shank rear end of the tool according to the screwing position. It is characterized in that the insertion position is regulated.

In the first restricting device, the shank portion of the tool is inserted into the chuck portion of the tool holder in a heated state by adjusting the screwing position of the tool holder into the center hole. The rear end abuts on the front end of the regulating tool, and the insertion amount (in other words, the protrusion amount of the tool) is determined.

Further, a second tool insertion amount regulating tool according to the present invention is a regulating tool for regulating an insertion amount of a tool into a tool holder having a chuck portion for holding a shank portion of the tool by shrink fitting. A regulating rod for regulating the position of the rear end of the shank portion of the tool, a holding member of the regulating rod, and an adjusting member screwed to the holding member in a state fixed to the rear end of the regulating rod. The holding member can be inserted and fixed to the center hole of the tool holder from the rear end of the center hole, and the regulating rod moves the shank rear end position of the tool in accordance with the screwing position of the adjusting member to the holding member. It is characterized by regulation.

This second restricting tool is also provided in the center hole of the tool holder, and the screwing position of the adjusting member with respect to the holding member is adjusted in advance, and the tool is inserted into the chuck portion of the heated tool holder. When the shank is inserted, the rear end of the shank abuts on the tip of the regulating rod, and the insertion amount (in other words, the amount of protrusion of the tool) is determined.

By the way, the tool inserted into the heated holder is cooled (returned to a normal temperature) so that the shank portion is tightened to the chuck portion. In this case, the holder,
The rear end of the shank portion and the front end of the regulating tool (regulating rod) are pressed against each other based on the difference between the thermal expansion coefficients of the tool and the regulating tool, and the axis of the tool is inclined with respect to the axis of the holder. (Reduction in gripping accuracy).

In order to solve such a problem, in the case of the first restrictor, the restrictor itself or in the case of the second restrictor, the coefficient of thermal expansion of the regulating rod is calculated from the coefficient of thermal expansion of the tool holder. May be made of a material having a large size. Alternatively, an elastic body may be provided at the tip of the regulating tool itself or the regulating rod. In the regulating rod, an elastic body may be provided between the rear end and the adjusting member.

Further, the adjusting device according to the present invention is the adjusting device for the second regulating tool, wherein the adjusting device holds the tool holder, positions the rear end of the holder on a first reference plane, and A base for holding the restricting tool in a state parallel to the tool holder and positioning the end surface of the holding member on the first reference surface; and on the base, movable in the axial direction of the tool holder and the restricting tool. A moving member that is installed and has a second reference surface that comes into contact with the tip of the tool holder; and a measuring unit that is installed on the moving member and measures a distance from the second reference surface to the tip of the regulating rod. It is characterized by having.

This adjusting device is used for measuring and adjusting the position of the regulating rod in order to accurately determine the required amount of protrusion of the tool before assembling the second restricting tool into the tool holder. . First, the tool holder and the restricting tool are attached to the base. In this case, the holder and the regulating tool are installed in parallel, and the rear end of the holder and the end face of the holding member of the regulating tool are positioned with respect to the first reference plane. Next, the moving member is brought closer to the holder, and the second reference surface is brought into contact with the tip of the holder. As a result, the holder is sandwiched between the first and second reference surfaces, and the distance from the second reference surface to the tip of the regulating rod is as shown in FIG.
Corresponds to the insertion amount L1 shown in FIG. Therefore, by measuring the distance L1 by the measuring means while varying the position of the regulating rod in the axial direction by the adjusting member, an accurate insertion amount (in other words, the protrusion amount L2 of the tool) can be determined.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a tool insertion amount restricting device according to the present invention;

(First Embodiment, see FIG. 1) First Embodiment of the Present Invention
The restricting tool 20 according to the embodiment is to be applied to the tool holder 10. The tool holder 10 includes a tapered shank portion 11 and a chuck portion 12 and has a center hole 13 formed therein. A female screw 13a is formed in the center hole 13, and a distal end thereof is a small-diameter grip hole 13b.

The regulating tool 20 is fixed to the regulating rod 21 for regulating the position of the rear end of the shank 6 of the tool 5 shown in FIG. 8, a holding member 25 of the regulating rod 21, and the rear end of the regulating rod 21. In this state, the adjusting member 22 is screwed to the holding member 25. The regulating rod 21 and the adjustment member 22 are integrally fixed,
The male screw 22 a formed on the outer peripheral surface of the adjusting member 22 is screwed to the female screw 25 a formed on the inner peripheral surface of the holding member 25. A male screw 26a is formed on the outer peripheral surface of the distal end protruding portion 26 of the holding member 25.

The holding member 25 has its projection 26 inserted into the center hole 13 of the tool holder 10 and the male screw 26a is
It is integrated with the holder 10 by screwing it to 3a. At this time, the rear end face A of the holder 10 and the end face B of the holding member 25 abut. The regulating rod 21 is a male screw 22a of the adjusting member 22.
Regulates the rear end position of the shank portion 6 of the tool 5 according to the screwing position of the holding member 25 with respect to the female screw 25a.

That is, by engaging and rotating a wrench (not shown) with a hexagonal hole 22b provided at the rear end of the adjusting member 22, the adjusting member 22 and the regulating rod 21 are integrally formed with the holder 10.
The distance L1 between the tip of the regulating rod 21 and the tip of the holder 10 is determined.

The tool holder 10 with the regulating tool 20 mounted with the distance L1 adjusted as described above is set in a shrink fitting device (not shown) and heated to a predetermined temperature. In the heated state, the gripping hole 1 expanded in diameter by the thermal expansion of the chuck portion 12
The shank part 6 of the tool 5 shown in FIG. 8 (in this case, of course, not using the stopper 7) is inserted into 3b from above. The rear end of the shank portion 6 abuts on the front end of the regulating rod 21 to regulate the insertion amount L1 and the predetermined projection amount L2.
Can be obtained. After the insertion, the holder 10 is cooled and returned to the normal temperature, so that the chuck portion 12 contracts and the tool 5 is tightened / gripped in the grasping hole 13b. After gripping the tool 5, the restricting tool 20 is removed from the holder 10.

As a method of adjusting the distance L1, for example, the distance L1 may be measured while rotating the adjusting member 22 with the restricting member 20 attached to the holder 10.
The adjustment can be performed precisely and easily by using the adjustment device 50 described below. When the tool 5 is replaced next time, if the distance L1 has already been adjusted, the regulating tool 20
May be attached to the tool holder 10 as it is.

(Second embodiment, see FIG. 2) Second embodiment of the present invention
The restricting tool 30 according to the embodiment is to be applied to the tool holder 10 '. The tool holder 10 ′ has a center hole 13.
Except that another female screw 13c is formed.
Basically, it has the same configuration as the holder 10 shown in FIG.

The restricting tool 30 is provided on the shank 6 of the tool 5.
A regulating portion 31 for regulating the position of the rear end;
And an adjusting portion 32 formed with a male screw 32a that can be screwed to 3c. This restricting tool 30 is provided in the center hole 13 of the holder 10 '.
And the male screw 32a is screwed into the female screw 13c to be integrated with the holder 10 '. Then, a wrench (not shown) is engaged with a hexagonal hole 32b provided at the rear end of the adjusting portion 32 and rotated, so that the tip of the regulating portion 31 and the holder 1 are rotated.
The distance L1 from the tip of 0 'is determined.

The procedure for gripping the tool 5 on the holder 10 'in a shrink-fitting manner using this restricting tool 30 is the same as in the first embodiment. After the tool 5 is gripped, the restricting tool 30 may be removed from the holder 10 ', or may be subjected to cutting while being attached as it is. If the tool 5 is kept attached, it is not necessary to attach the regulating tool 30 each time the tool 5 is replaced next time.

(Improvement of gripping accuracy of tool) In the first and second embodiments, the tool 5 gripped by the shrink-fitting method on the holders 10 and 10 'is used to cool the holders 10 and 10' during cooling.
10 ′, the rear end of the shank portion 6 and the front ends of the restrictors 20 and 30 are pressed against each other based on the difference in the coefficient of thermal expansion between the tool 5 and the restrictors 20 and 30. 'May be inclined with respect to the axis of', and gripping accuracy may be reduced.

In order to solve such a problem, in the first embodiment, at least the coefficient of thermal expansion of the regulating rod 21 must be reduced.
In the second embodiment, the restricting member 30 may be made of a material having a large coefficient of thermal expansion. For example, holders 10 and 1
0 'is usually made of nickel chrome steel or the like including the chuck portion 12, but the regulating rod 21 or the regulating tool 30 may be made of copper, aluminum or the like having a larger coefficient of thermal expansion. The tool 5, including the shank portion 6, is usually made of cemented carbide and has a relatively small coefficient of thermal expansion.

At the time of contraction, the regulating rod 21 or the regulating tool 30 having a large coefficient of thermal expansion contracts more than the chuck portion 12 (retreats in the axial direction), and the tip of the regulating rod 21 or the regulating tool 30 and the shank 6 Pressure contact with the rear end is avoided, and the gripping accuracy of the tool 5 is improved.

Further, as shown in FIG. 3, an elastic body 23 made of heat-resistant rubber or the like may be fixed to the tip of the regulating rod 21.
Similarly, as shown in FIG. 4, an elastic body 33 made of heat-resistant rubber or the like may be fixed to the tip of the restricting tool 30.

Alternatively, as shown in FIG.
The rear end of the control member 22 may be axially movably attached to the hole 22 c of the adjustment member 22, and a coil spring 24 may be interposed between the rear end of the regulating rod 21 and the adjustment member 22. The hole 22c of the adjusting member 22 is closed with a plug 26, and the regulating rod 21 is prevented from coming off from the adjusting member 22 by a flange portion 21a.

In place of the coil spring 24, an elastic body such as a disc spring or heat resistant rubber may be interposed. In short, what is necessary is just to constitute so that the regulating rod 21 located inside the holder 10 and contracting the slowest at the time of contraction after grasping can be retracted in the axial direction by pressing from the shank portion 6 of the tool 5. Also,
The provision of the elastic body and the use of the difference in the coefficient of thermal expansion may be used in combination.

(One Embodiment of Adjusting Apparatus, See FIG. 6) Next, one embodiment of the adjusting apparatus of the restrictor 20 according to the first embodiment will be described with reference to FIG. This adjusting device is provided with a regulating rod 21 for accurately determining the required amount of protrusion of the tool before the regulating tool 20 is incorporated into the tool holder 10.
Used to measure and adjust the position of

That is, the adjusting device 50 is roughly composed of the base 51
, A moving member 61, its driving means 65, and a micrometer 70. On the left side of the base 51 in FIG. 6, a reference portion 52 having a first reference surface C is protruded, and the reference portion 52 has a shank portion 1 of the tool holder 10.
A hole 53 into which the rear end portion 1 can be fitted and a female screw 54 into which the male screw 26a of the restricting tool 20 can be screwed are formed.

The rear end face A of the tool holder 10 is positioned on the first reference plane C by inserting the rear end of the tool holder 10 into the hole 53 and fastening the bolt 55 to the female screw 13a with the sleeve 56 interposed therebetween. In addition, the restricting member 20 is provided with the holding member 2 by screwing the male screw 26 a into the female screw 54.
5 is positioned in contact with the first reference plane C. At this time, the tool holder 10 and the restricting tool 20 are held on the base 51 with their respective axes X1, X2 parallel to each other.

The moving member 61 has a second reference plane D,
The tool holder 10 is slidably mounted on the base 51 via a sliding member 62, and is driven by a driving unit 65 in the direction of the axis X <b> 1 of the tool holder 10. The driving means 65 is provided with an adjusting bolt 67 via a collar 66 on a protrusion 59 provided on the right side of the base 51.
And the leading end of the bolt 67 is connected to the moving member 61.

The bolt 67 has a male screw 67a with a collar 6
6, the movable member 61 can be advanced and retracted in the direction of the axis X1 on the base 51 with the advance and retreat. That is, the moving member 61 is moved closer to the holder 10 while rotating the bolt 67, and the second reference plane D
To the tip of the holder 10. Now, holder 1
0 is sandwiched between the first and second reference planes C and D, and the holder 10
Is reflected in the adjusting device 50.

The micrometer 70 is a well-known micrometer. The head 71 is fixed on the moving member 61, and the knob 72 at the rear end is rotated by rotating the knob 72 at the rear end.
3 advances and retreats on the axis X2 of the restrictor 20, and the amount of advance thereof, that is, the distance L1 from the second reference plane D can be accurately measured. This distance L1 corresponds to the insertion amount of the tool 5. Therefore, by rotating the adjusting member 22, the regulating rod 21 is rotated.
If the distance L1 is measured by the micrometer 70 while adjusting the position on the axis X2, an accurate insertion amount L1 (in other words, a protrusion amount L2) can be obtained.

(Other Embodiments) The tool insertion amount regulating tool and its adjusting device according to the present invention are not limited to the above embodiment, but can be variously modified within the scope of the invention.

In particular, there are two types of tool holders: a one-piece type which is directly attached to a spindle of a machining center, and a two-piece type which is used by being attached to an attachment having a manipulator gripping part. Can also be applied. Also, various types of measuring means other than the micrometer 70 can be used.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which a first embodiment of a regulating tool according to the present invention is mounted on a tool holder.

FIG. 2 is a cross-sectional view showing a state in which a second embodiment of the regulating tool according to the present invention is mounted on a tool holder.

FIG. 3 is a sectional view showing a state in which the first improved example of the first embodiment is mounted on a tool holder.

FIG. 4 is a sectional view showing a state in which the first improved example of the second embodiment is mounted on a tool holder.

FIG. 5 is a sectional view showing a state where the second improved example of the first embodiment is mounted on a tool holder.

FIG. 6 is a sectional view showing a use state of an embodiment of the adjusting device according to the present invention.

FIG. 7 is a sectional view showing a state in which a cutting tool is attached to a tool holder (conventional example).

FIG. 8 is a perspective view showing a use state of a conventionally proposed stopper for positioning a protrusion amount of a tool.

[Explanation of symbols]

 Reference Signs List 5 cutting tool 6 shank part 10, 10 'tool holder 12 chuck part 20 regulating member 21 regulating rod 22 adjusting member 23, 24, 33 elastic member 25 holding member 30 regulating member 50 adjusting Device 51: Base 61: Moving member 70: Micrometer L1: Insertion amount C: First reference plane D: Second reference plane

Claims (7)

[Claims] 1. A restricting device for restricting an insertion amount of a tool into a tool holder having a chuck portion for holding a shank portion of the tool by shrink-fitting, wherein a center hole of the tool holder is connected to the center hole. A tool insertion amount restricting tool which can be screwed from a rear end of the tool and restricts an insertion position of a rear end of a shank portion of a tool according to a screwing position. 2. The tool insertion amount restricting tool according to claim 1, wherein the tool has a coefficient of thermal expansion higher than that of the tool holder. 3. The tool insertion amount restricting tool according to claim 1, wherein an elastic body is provided at a tip end. 4. A restricting device for restricting an insertion amount of a tool into a tool holder having a chuck portion for holding a shank portion of the tool by shrink fitting, wherein the position of a rear end of the shank portion of the tool is regulated. A regulating rod, a holding member of the regulating rod, and an adjusting member fixed to the rear end of the regulating rod and screwed to the holding member. A tool insertion amount restricting tool, which can be inserted and fixed from the rear end of the center hole, and wherein the restricting rod restricts the position of the rear end of the shank portion of the tool according to the screwing position of the adjusting member to the holding member. 5. The tool insertion amount restricting tool according to claim 4, wherein said restricting rod is made of a material whose coefficient of thermal expansion is higher than that of a tool holder. 6. The tool insertion amount restricting tool according to claim 4, wherein an elastic body is provided at a front end or a rear end of the restricting rod. 7. The adjusting device for a tool insertion amount restricting tool according to claim 4, wherein the tool holder is held and a rear end of the holder is positioned on a first reference plane, and the tool insertion amount restricting device is controlled. A base for holding the tool in parallel with the tool holder and positioning the end surface of the holding member on the first reference surface; and movably mounted on the base in the axial direction of the tool holder and the restricting tool. A moving member having a second reference surface abutting on a tip of the tool holder; and a measuring unit installed on the moving member and measuring a distance from the second reference surface to a tip of the regulating rod; An adjustment device comprising: