JP6379312B1 - Tool holder with internal space - Google Patents

Abstract

A shank portion is provided with necessary rigidity not only on the outer periphery but also on the inner side thereof, and the weight of the tool holder is reduced by forming an inner space.
In a tool holder (1) having a holder part (12) for detachably holding a tool (9) on the front side and a shank part (11) detachably fitted to a main shaft on the rear side, an inner wall (5) of an outer periphery (6) and a coolant are provided. The passage pipe 8 is connected by a plurality of plate-like bodies 2 orthogonal or oblique to the longitudinal direction, and by forming an internal space on the front side and the rear side of each of the plurality of plate-like bodies , The tool holder 1 which can achieve the said subject.
[Selection] Figure 1

Description

  The present invention is directed to a tool holder having an internal space.

  In a tool holder having a holder part that detachably holds a tool on the front side and a shank part that is detachably fitted to the main spindle on the rear side, the tool can be moved from the main spindle to the tool via the tool holder. The rotational moment necessary for operation is transmitted.

  Therefore, it is essential for the tool holder to have the rigidity necessary for transmitting the moment.

  As a result of emphasizing such rigidity, in the tool holder, the inside of the pipe other than the coolant passage pipe extending in the vicinity of the rotation center axis is made of a material that generates a tool, specifically, nickel chrome steel or the like. The configuration is filled with a metal material having high hardness and excellent wear resistance and heat resistance, and the fact that weight reduction of the tool holder has not been emphasized is a fact that is not false.

  That is, the weight of the tool holder is merely reduced by improving the design at all or selecting the material.

  Incidentally, the tool holder described in Patent Document 1 employs a configuration in which the entire inner space of the shank portion 8 is hollow (FIG. 1 and the means for solving the abstract and claim 1), while the tool holder described in Patent Document 2 is used. 1 adopts a configuration in which the region other than the coolant passage hole arranged around the rotation center axis in the shank portion 2 is in a hollow state (FIGS. 1 and 2 and the means for solving abstracts and claims) 1).

  However, in the case of the hollow configuration as in Patent Documents 1 and 2, the outer periphery of the shank portion inevitably requires a certain thickness to obtain the rigidity required for the tool holder, and is always sufficiently lightweight. Cannot be realized.

  On the other hand, in the tool holder described in Patent Document 3, an aluminum alloy is used as a base material for the main part of the taper shank part and the main part of the holder part, and the weight is reduced while ensuring a predetermined rigidity. Yes.

  However, in the tool holder of Patent Document 3, it is not necessary to employ a configuration in which all of the tapered shank portion and the holder portion are filled as long as predetermined rigidity can be ensured by the aluminum alloy.

  However, in patent document 3, the said filling structure is employ | adopted and the device required in order to further reduce a tool holder is not performed.

JP 2001-252841 A JP 2006-326696 A JP 2011-11298 A

  An object of the present invention is to provide the shank portion with necessary rigidity not only on the outer periphery but also on the inner side thereof, and to realize weight reduction of the tool holder by forming an inner space.

In order to solve the above problems, the basic configuration of the present invention is as follows.
In a tool holder having a holder portion that detachably holds a tool on the front side and a shank portion that is detachably fitted to the main shaft on the rear side, the cross section in a direction perpendicular to the longitudinal direction is circular. a coolant passage pipe which extends at the inner wall and surrounding the rotational axis states the periphery, are connected by the longitudinal and orthogonal or a plurality of the plate-like body disposed in the oblique direction A tool holder that forms an internal space on the front side and the rear side of each of the plurality of plate-like bodies ,
Consists of.

In the basic configuration, the plate-like body is a flat surface shape or curved surface shape having a cross section in which one side is long and the other side orthogonal to the one side is short, for example, a rectangle or an ellipse. it means.

In the present invention based on the above basic configuration, a metal material such as a steel material or an aluminum alloy is employed in the shank portion, and the rotational moment necessary for the operation of the tool is obtained for the material and shape of the peripheral wall and plate-like body. It is a natural premise to design with the rigidity required to transmit from the spindle to the tool.

Under such a premise, in the basic configuration , weight reduction of the tool can be achieved by forming internal spaces on the front side and the rear side of each of the plurality of plate-like bodies orthogonal to the longitudinal direction.

  In addition, as will be described later, in the shank portion, the bending moment that is borne when transmitting the rotational moment from the main shaft to the tool increases as it approaches the rotation center axis from the inner wall of the outer periphery. It can be shared not only by the outer periphery but also by the plate-like body or the lattice-like body.

  As a result, in the basic configuration, further weight reduction can be realized as compared with the configurations of Patent Documents 1 and 2 in which all or most of the necessary rigidity is provided on the outer periphery.

Furthermore, in case of installing the coolant passage holes in the part of the plurality of the plate-like body, since it is possible to fill the coolant into the inner space of the tool holder, the efficient cooling of the tool holder Can be realized.

The basic structure is shown, (a) is a sectional side view along the longitudinal direction (note that the section indicates the center position in the left-right direction), (b), (c) in the side sectional view, It is sectional drawing of the plate-shaped body in the direction orthogonal to the longitudinal direction of the position of AA and BB, (d) is columnar reinforcement along the longitudinal direction of the position of CC in the said longitudinal direction. sectional view der the timber Ri, (e) is a cross-sectional view of a reinforcement plate shape along the longitudinal position of the C-C in the longitudinal direction.

Hereinafter, the basic configuration will be described according to the embodiment.
In the basic configuration, the shank portion 11 and the holder portion 12 are indispensable constituent elements. However, in most tool holders 1, as shown in FIG. And a configuration in which the holder portion 12 and the flange portion 13 are detachable.

  As shown in FIGS. 1A, 1B, and 1C, the basic configuration surrounds the inner wall 5 of the outer periphery 6 and the rotation center shaft 7 in the shank portion 11 located behind the holder portion 12. The coolant passage pipe 8 extended in the state is connected by one or a plurality of plate-like bodies 2 arranged in a direction orthogonal or oblique to the longitudinal direction.

  The number of the plate-like bodies 2 can be appropriately selected depending on the length of the tool holder 1 and the thickness of the plate-like body 2.

  Since the coolant passage pipe 8 is extended in the basic configuration, the plate-like body 2 is connected to the entire area of the inner wall 5 and has a coolant passage hole as shown in FIG. An embodiment without 20 can be selected.

However, even in the basic configuration, as shown in FIG. 1, an embodiment in which a coolant passage hole 20 is installed in a part of the plurality of plate-like bodies 2 can be selected (FIG. 1 (c) The coolant passage hole 20 is formed by a gap between the coolant passage 20 and the inner wall 5. In this case, the presence of the coolant passage pipe 8 is meaningless.

  However, in most tools 9, a coolant passage pipe is disposed in a state of surrounding the rotation center shaft 7.

  Therefore, the coolant passage pipe 8 of the basic configuration smoothly realizes connection with the coolant passage pipe in the tool 9, while a coolant discharge hole (not shown) is installed along the longitudinal direction. The tool holder 1 can be efficiently cooled in a state in which the coolant is filled in the internal space, and is not meaningless.

  In the basic configuration, it is naturally assumed that the rigidity necessary for the operation is ensured by selecting the material and shape of the metal material in the outer periphery 6 and the plate-like body 2.

In the basic configuration, as shown in FIG. 1A, the thickness of the plurality of plate-like bodies 2 is gradually increased from the inner wall 5 of the outer periphery 6 toward the rotation center axis 7. Embodiments can be employed.

  When the rotational moment is transmitted to the tool 9, the bending moment generated in the tool holder 1 increases as the distance from the inner wall 5 to the rotational center axis 7 increases. However, the above-described embodiment is adapted to such an increase in the bending moment. can do.

Furthermore, in the basic configuration, as shown in FIG. 1 (a), an embodiment is characterized in that the thickness of the plurality of plate-like bodies 2 is gradually increased from the front side in the longitudinal direction. Can be adopted.

  In the tool holder 1, the bending moment generated when the rotational moment is transmitted to the tool 9 increases as the distance from the front side holding the tool 9 increases. However, the above embodiment is adapted to such an increased state. be able to.

  Hereinafter, it demonstrates according to an Example.

In the basic configuration, in the basic configuration, as shown in FIGS. 1A, 1D, and 1E , a part or all of the plurality of plate-like bodies 2 are arranged with reference to the rotation center axis 7. is characterized in that it is bridged by a plurality of pillar shape reinforcing member 41 or plate shape reinforcing member 42 have the same shape disposed along the longitudinal direction at equal angular.

In embodiments, a plurality of columnar shape body reinforcing member 41 or plate shape reinforcing member 42 have the same shape, along the longitudinal direction, what bridged at equal angular rotation center shaft 7 as a reference Is derived from ensuring the balance of the rotation axis of the tool holder 1.

The erection of such posts shape reinforcing member 41 or plate shape reinforcing member 42, in the embodiment, the rigidity required for the tool holder 1 can be sufficiently reinforced.

Incidentally, according to the bending moment at the time of actuation, the distance from the front side operation is carried out, if considering that increases reinforcements 42 of the pillar shape reinforcing member 41 or the plate shape is away from the front side, The reinforcement effect regarding the rigidity resistance can be exhibited.

Thus, for the cross-sectional area of the reinforcements 42 of the pillar shape reinforcing member 41 or the plate shape, as shown in FIG. 1 (a), it is increased as the distance from the front side may.

  Thus, in the present invention, the tool holder can be reduced in weight by forming an internal space inside the outer periphery of the tool holder, and its utility value is tremendous.

1 tool holder 11 shank portion 12 holder portion 13 the flange portion 2 the plate-like body 20 coolant passing holes 3 poster shape 41 poster shape reinforcing member 42 plate-shape of the reinforcing member 5 the inner wall 6 outer periphery 7 rotation axis 8 coolant passage Pipe 9 tool

Claims (6)

In a tool holder having a holder portion that detachably holds a tool on the front side and a shank portion that is detachably fitted to the main shaft on the rear side, the cross section in a direction perpendicular to the longitudinal direction is circular. a coolant passage pipe which extends at the inner wall and surrounding the rotational axis states the periphery, are connected by the longitudinal and orthogonal or a plurality of the plate-like body disposed in the oblique direction A tool holder in which internal spaces are formed on the front and rear sides of each of the plurality of plate-like bodies . The tool holder according to claim 1 , wherein a coolant passage hole is provided in a part of the plurality of plate-like bodies . The tool holder according to any one of claims 1 and 2, wherein the thickness of the plate-like body is gradually increased from the outer peripheral inner wall toward the rotation center axis. The tool holder according to any one of claims 1, 2, 3, and 4, wherein the thickness of the plate-like body is successively thicker as the distance from the front side in the longitudinal direction increases. A plurality of pillar-shaped or plate-shaped reinforcing members having the same shape in which some or all of the plurality of plate-like bodies are arranged along the longitudinal direction at equal angles with respect to the rotation center axis. The tool holder according to any one of claims 1, 2, and 3, wherein   The tool holder according to any one of claims 1, 2, 3, 4, and 5, wherein a flange portion is provided at a tip of the shank portion, and the holder portion is detachable from the flange portion.

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