JPH0819929A - Holding mechanism of short tapered tool holder - Google Patents

Abstract

PURPOSE:To stably hold a holder by a tool pot by building a truncated conical top the side surface energized by an elastic body toward the holder of which is inclined toward the holder and a steel ball which can be projected from the side surface of an insertion cylinder as it is pressed by the side surface in the insertion cylinder fit in the tool pot. CONSTITUTION:A holding mechanism of a holder 10 presses a hollow tapered part 9 by a steel ball 13 from inside. When the holder 10 and a tool pot 12 are engaged with each other, an insertion cylinder 16 is inserted into the hollow tapered part 9. The steel ball 13 of the insertion cylinder 16 is constantly energized in the radial direction and the holder direction by the side surface of a top 18, but the steel ball 13 is not projected on the tapered inside surface except for a hooking part 8 as it is restrained by this side surface. However, when the steel ball 13 is positioned at the hooking part 8, it is projected from the side surface of the insertion cylinder 16, and this hooking part 8 hooks the steel ball 13. Additionally, the outside surface of the insertion cylinder 16 slides on and makes contact with the inside surface of the tapered part 9, and when the outside surface of the tapered part is made to slide on and make contact with the inside surface of the tool pot through a tapered sleeve 15, the holder 10 is stably held.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding mechanism for holding a short taper tool holder with a tool pot.

[0002]

2. Description of the Related Art In a machine tool, a tool holder (for example, a MAS standard) to which each tool is attached is stored and held in a tool pot connected by a chain in order to automatically replace the tool and improve work efficiency. are doing. Conventionally, as shown in FIG. 5, a tool holder 1 has a pull stud 4 at a rear end of a tapered portion 3 extending rearward of a grip portion 2,
A tool pot 5 having a substantially cylindrical shape with one side open has a steel ball 7 urged toward the center by a spring 6 at one end that abuts on the bottom of the cylinder, and the pull stud 4 is inserted into the tool pot 5 to remove the steel. It was held by pressing from the outer periphery with the ball 7.

[0003]

In recent years, in the machine tool industry, in order to realize high rotation, high load and high precision machining, a short taper tool holder (for example, DIN standard, hereinafter,
The holder is simply referred to as this short taper holder). Since this holder has a shorter tapered portion than the conventional tool holder, it cannot hold the spring such that the spring is built in and the steel stud is pressed against the pull stud, unlike the conventional tool holder.

Further, even if the above-mentioned problem is eliminated, the conventional holding mechanism merely presses and holds the holder from the outside in the radial direction, and further, the springs for urging the steel balls are individually provided. , As the pressure of each spring changes, holding of the holder becomes uncertain and unstable, and it is necessary to replace the spring individually, so it is not suitable for a high performance short taper holder. It was Therefore, we decided to develop a mechanism to hold the holder in the tool pot by a means different from this conventional holding method.

[0005]

As a result, what has been developed is a holder and a tool pot, wherein the holder is provided with a hooking portion on the inner side surface of a hollow tapered portion opened toward the tool pot, and the holder has a substantially cylindrical shape. The pot has an insertion cylinder that can be fitted into the tapered portion, and the insertion cylinder has a truncated cone-shaped top whose side face biased by an elastic body toward the holder is inclined toward the holder and is pressed against this side face. Is a holding mechanism for a short taper tool holder that incorporates a steel ball that can project from the side surface of the insertion cylinder. The tool pot is connected with a chain as in the past, and it is used for an automatic tool changer,
Used as a tool stocker.

The hooking portion in the present invention means a groove having a cross section convex outward in the radial direction along the inner surface of the taper or a taper having a radius which intermittently increases inward from the hollow opening end. Circumferentially continuous parts such as side surface boundary parts, or intermittent holes (dents) or holes on the inner surface of the taper arranged on the same circumference
(Things that penetrate from the inner side surface to the outer side surface) or the like may be used. It is preferable that the outer side surface of the insertion cylinder and the inner side surface of the taper portion are in sliding contact or close to each other so that they are in sliding contact, and the outer side surface of the tapered portion and the inner surface of the tool pot are in sliding contact. A cushioning material such as a taper sleeve may be arranged between the outer surface of the tapered portion and the inner surface of the tool pot. The elastic body for urging the top toward the holder is a coil spring made of metal, a rubber elastic body made of resin, or the like.

[0007]

The holder holding mechanism of the present invention eliminates the pull stud of the conventional tool holder and presses the hollow tapered portion with the steel ball from the inside. When the holder and the tool pot are fitted together, the insertion tube is inserted into the hollow taper. The steel ball of the insertion tube is constantly urged in the radial direction and the holder direction by the side surface of the top, but the inner side surface of the taper other than the hooking portion is restrained by this side surface and the steel ball does not project. However, when the steel ball is located at the hooking portion, it projects from the side surface of the insertion tube, and this hooking portion hooks the steel ball. Further, when the outer surface of the insertion cylinder is in sliding contact with the inner surface of the tapered portion and the outer surface of the taper is in slidable contact with the inner surface of the tool pot via the tapered sleeve, the holder is more stably held.

As described above, the hook portion locks the holder by projecting the steel ball from the side surface of the insertion tube toward the hook portion,
Prevent the holder from slipping out of the tool pot. Since this hooking portion can hook the steel ball toward the tapered opening, it may be continuous in the circumferential direction, or may be an intermittent hole or hole on the inner surface of the taper arranged on the same circumference. . In the former case, an appropriate number of steel balls may be arranged continuously along the outer circumference of the insertion cylinder, but in the latter case, the steel balls of the insertion cylinder are arranged intermittently in a positional relationship corresponding to the holes or holes. To do.

[0009]

Embodiments of the holding mechanism for a short taper tool holder according to the present invention will be described below with reference to the drawings. FIG. 1 is an axial cross-sectional view showing a state in which a holder 10 having a stepped hooking portion 8 having a crank-shaped cross section on the inner surface of a tapered portion 9 is fitted in a tool pot 12 connected by a chain 11. . In this embodiment, the holder for HSK tool (DIN standard product) is applied to a tool pot chain by the holding mechanism of the present invention to correspond to an automatic tool changer. As can be seen by comparing with the conventional example shown in FIG. 5, the thickness of the side surface of the tool pot 12 corresponding to the position where the steel balls 13 for holding the holder 10 are arranged is small, and the steel balls 13 are directly urged in the radial direction. A spring for pressing the steel ball 13 cannot be arranged on the side surface of the tool pot 12.

As shown in FIG. 1, the taper portion 9 extending from the grip portion 14 of the holder 10 is short and its outer diameter is larger than that of a conventional tool holder. When this taper portion 9 is fitted into the hollow cylindrical tool pot 12, the outer surface of the taper portion 9 is brought into sliding contact with the taper sleeve 15 attached to the inner edge of the opening of the tool pot 12, and at the same time, the insertion tube 16 is inserted into the taper portion 9. To be done. This insertion tube 16 has a support frame 17 protruding in the radial direction.
The end is attached to the tool pot 12 and fixed. On the inner side surface of the taper portion 9, there is a hooking portion 8 consisting of a crank-shaped step formed by an inner side surface having intermittently different diameters. Grab and catch. In this way, the taper portion 9 is not tapered from the outside.
15, the steel ball 13 is hooked from the inside, and the holder 10 is stably held by the tool pot 12.

A frusto-conical top 18 having a side surface inclined from the radial direction to the holder direction is provided in the insertion tube 16.
Since it is pressed by the spring 19 in the axial direction, the steel ball 13 in contact with this side surface is in a state of being simultaneously urged in the radial direction and the holder direction. When the insertion tube 16 is inserted into the tapered portion 9, the inner surface of the tapered portion 9 is close to the outer surface of the insertion tube, so that the steel ball 13 does not particularly project.
Sliding the inner surface. However, when the steel ball 13 reaches the hook portion 8, the radial component of the bias projects the steel ball 13 in the radial direction, that is, toward the hook portion 8. As a result, the steel ball 13 is caught by the hook portion 8, and the holder 10 is relatively moved to the tool pot.
It will be hooked at 12.

In this embodiment, in order to correspond to the automatic tool changer, the tool pot 12 which realizes the holding mechanism described above is connected by the chain 11, and the hooking portion 8 is hooked by the steel ball 13. In order to release the above, a pushing bar 20 is provided in the tool pot 12 so as to come into contact with the outer periphery of the trailing edge of the tapered portion 9 from the rear of the insertion tube 16. Extrusion bar 20 is normally in the holder direction
When the holder 10 is biased (forward) and pushed backward when the holder 10 is inserted into the tool pot 12, the presence or absence of the tool is electrically detected (switch pressing, etc.), and while the holder 10 is being held. Pressing against the holder 10 from the rear contributes to stability of holding. When releasing the holding of the holder 10, the pushing bar 20 pushes the outer circumference of the trailing edge of the tapered portion 9, and the hooking portion 8 reversely presses the steel ball 13 and pushes it back to the insertion tube 16 to release the hooking state. Then, the extrusion bar 20 returns to the original position again.

FIG. 2 is a sectional view showing the holder 10 shown above.
This is an example in which the hooking part of is replaced with the hooking part 21 having an arc-shaped cross section, which corresponds to a KV tool (product name: manufactured by Kobe Kennametal Co., Ltd.). Further, FIG. 3 shows a line groove 22 having a cross section slightly larger than the diameter of the steel ball provided along the inner side surface of the tapered portion 9,
Compatible with Coromant Capto Tool (product name: Sandvik KK). In either case, the function as the hooking portion shown in the embodiments does not change. Conversely, as long as the diameter of the insertion tube is the same, the shape of the hooking portion on the inner surface of the tapered portion of the holder does not matter. The point to be noted is that when the insertion tube is inserted into the taper portion, the steel ball can be projected to the hooking portion in order to hold the holder. Close contact with the side surface of the tool pot, the taper sleeve, or the upper surface of the tool pot.

When paying attention to this point, as shown in the example constructed for the KM tool (product name: Kobe Kennametal Co., Ltd.) in FIG. 4, the hole 23 in the biasing direction of the steel ball 13 is held. It is also possible to provide a predetermined number of taper portions 9 of 10 and use these holes 23 as hook portions. The feature of this example is that the holes 23 are provided in accordance with the urging direction of the steel balls 13, so that the steel balls 13 can be projected and returned relatively smoothly. In this case, the hole
Since the 23 are arranged intermittently in the circumferential direction, the insertion tube 16
The arrangement of the steel balls 13 provided in the above must be matched with the arrangement of the holes 23, but if the conditions mentioned in the above-mentioned points of interest are satisfied, it is functionally different from the first embodiment and its derivative type. There is no place.

[0015]

With the holding mechanism of the present invention, a tool capable of stably holding a high-performance (high rotation, high load, high accuracy) short taper tool holder which has recently become widespread, as has been seen in the past. You will be able to serve pots. Of course, this tool pot can be connected with a chain to support an automatic tool changer, and combined with the high performance of the holder, the labor of the machine tool can be reduced, the time can be shortened, and high-quality products can be mass-produced. Can greatly contribute to realization. Therefore, there is an economic effect that work efficiency is improved and manufacturing cost is reduced.

On the other hand, if a structural comparison is made with the conventional tool pot, the conventional tool abuts the front end of the pot against the grip portion of the holder and presses the pull stud from outside with a steel ball to hold it. On the other hand, in the holding mechanism of the present invention, by sandwiching the tapered portion of the holder from inside and outside (for example, from the outside with a tapered sleeve and from inside with a steel ball), the holder can be held more reliably. .

Further, in the prior art, since a separate spring is prepared for each of a plurality of steel balls, the holding state of the holder may become unstable due to individual changes in the characteristics of the spring. However, in the present invention, the piece for urging the steel ball in the radial direction is pressed by one spring and urges the steel ball equally, so that the holder is stably held in the pot. It can prevent rattling and misalignment, and requires only one spring replacement, making it easy to maintain. As described above, even when the holding performance is examined, it is understood that the holding mechanism of the present invention is greatly improved over the conventional one.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment in which a holding mechanism of the present invention is applied to an HSK tool.

FIG. 2 is a view corresponding to FIG. 1 in which the holding mechanism is applied to a KV tool.

FIG. 3 is a view corresponding to FIG. 1 in which the holding mechanism is applied to a Coromant Capto tool.

FIG. 4 is a view corresponding to FIG. 1 in which the holding mechanism is applied to a KM tool.

FIG. 5 is a sectional view of a tool pot of a conventional holding mechanism.

[Explanation of symbols]

 8 Hook part 9 Tapered part 10 Short taper Tool holder 12 Tool pot 13 Steel ball 16 Insertion cylinder 18 Top 19 Spring 21 Hook part 22 Groove 23 Hole

Claims (1)

[Claims] 1. A short taper tool holder and a tool pot for holding the holder, wherein the holder has a hooking portion on an inner side surface of a hollow taper portion opened toward the tool pot, and the tool pot having a substantially cylindrical shape has the taper portion. Has an insertion cylinder that can be fitted into the portion, and the insertion cylinder has a frustoconical top whose side face biased by an elastic body toward the holder is inclined toward the holder, and the side face of the insertion cylinder pressed by the side face. Holding mechanism for a short taper tool holder that has a steel ball that can project from it.