JPH0451954Y2 - - Google Patents

Description

[Detailed explanation of the invention] (1) Industrial application field This invention is a flexible machining cell (hereinafter referred to as
It's called FMC. ) and flexible manifold actuating systems (hereinafter referred to as FMS), etc., related to tool holders that hold multiple tools.

(2) Conventional technology Conventionally, in production equipment such as FMC and FMS, multiple tools are held by a tool holder, and the tools are transferred between the tool holder, which is fixedly placed on a transport pallet, and the tool magazine of a machining center. When replenishing or replacing tools, a means is provided to transfer tools via the spindle and an automatic tool changer (hereinafter referred to as ATC) by moving the axes of the machining center, that is, moving the X, Y, and Z axes.

When the spindle transfers the tool to and from the tool holder, the tool is gripped or unclamped by a positioning operation by shaft movement and a tool clamp/unclamp mechanism of the spindle. That is, an example of a conventional tool holder will be explained with reference to FIGS. 4 and 6. FIG. 4 is a perspective view showing an example of a conventional tool holder for a horizontal machining center. FIG. 5 is a side sectional view taken in the direction of arrow I in FIG. 4.

In FIGS. 4 and 5, four rows of half-shaped lower holding stands 102a are integrally formed on a base 101, and furthermore, a support 103 is erected, and another four rows of half-half holding stands 102a are provided on the support 103. A split upper holding stand 102b is integrally attached. Each holding stand 102
A holding member 111 is fixed to a and 102b.
Therefore, in this example, eight tools T are attached to the holding member 11.
1 and held horizontally. Also pedestal 101
is fixedly placed on a pallet P and transported.

Each tool T is engaged with and placed on the holding member 111, and the main shaft 105 is supported by the main shaft head 106 by movement in three directions indicated by the two-dot chain line.
After the tool holder 104 is inserted into the taper hole 105a of the main shaft 105, it is transferred and removed by the tool clamping and unclamping operations of the main shaft 105.

The tool T has a main shaft 105 as shown in FIG.
To unclamp the drawbar, the drawbar rear shaft 107a is pressed in the direction of the arrow by an unillustrated hydraulic cylinder provided behind the main shaft 105. The drawbar 107 is slid to the left in the figure, and the collet 108 is moved to the left by the pressing force of the drawbar 107. The collet tip 108a expands within the inner wall 109a, disengages from the pull stud 110, and becomes unlocked.

After reaching the unclamped state, the tip of the drawbar 107 further comes into contact with the rear part of the pull stud 110, and the tool T moves forward as shown by the arrow, slightly deviating from the spindle taper hole 105a, resulting in a wedge effect between the spindle taper hole 105a and the tool holder 104. Solve.

(3) Problems to be solved by the invention In FIG.
The tool T is engaged with and placed on the holding member 111 of 2b, and when clamping/unclamping the tool holder 104 from the spindle 105, the drawbar 107 inside the spindle is usually moved from behind in the spindle axis direction as explained in FIG. There is a slight collision, and the taper fit due to the wedge effect is released. For this purpose, the tool T is attached to the holding member 111 of the tool holder by the main shaft 105.
Since the tool T moves slightly in the axial direction when transferring the tool, it was necessary to provide a slight margin between the protrusion 111a of the holding member 111 and the gripping groove 104a of the tool holder 104. There was a problem with the device sometimes falling due to vibration or impact.

The purpose of the present invention is to provide a tool holder equipped with a floating mechanism to prevent tools from falling due to vibration or impact during transportation. There is a particular thing.

(4) Means and effects for solving the problem The present invention is an improvement on the conventional tool holder, in that the holding part of the tool holder is provided with a mechanism for floating in the axial direction of the tool. .
That is, the means includes a holding stand provided for holding a tool used in a machine tool in a horizontal direction with the axis of the tool, and a holding stand provided for holding the tool in a downward direction perpendicular to the axis of the tool on the holding stand. The tool is provided for holding a recessed gripping portion of the tool, and has an engaging portion that engages with the recessed gripping portion of the tool;
a half-shaped holding member movable on the holding stand in the axial direction of the tool; provided on the holding stand;
a guide member that restricts rotation of the holding member in a circumferential direction with respect to the holding base, prevents separation of the holding member from the holding base, and guides the holding member so as to be movable in the axial direction of the tool; and the guide A tool holder comprising a spring member provided between a member and the holding member and biasing the holding member in the axial direction of the tool and toward the holding base.

Thus, the holding member is constantly biased in one direction by the biasing force of the disc spring guided by the bolt. Therefore, the holding member always comes into close contact with the holding base in one direction, and floats in the other direction. In other words, by providing this floating mechanism, the gap between the gripping groove of the tool holder and the protrusion of the holding member can be minimized, and the tool holder is always held in close contact with the holding member, preventing vibrations and shocks during transportation. It won't fall easily, and its holding ability will be much improved.

(5) Example Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. FIG. 1 is a side sectional view of the tool holder according to the present invention. 2A is a front view of the tool holding member 4 in FIG. 1 taken out, FIG. 2B is a sectional view taken along the - line in FIG. 2A, and FIG. .

First, the overall structure of the tool holder will be described with reference to FIG. 1, and the overall structure of the tool holder is almost the same as a conventional tool holder. That is, the pedestal 1 is fixed onto the pallet P with bolts or the like (not shown). A lower holding base 2a is fixedly installed on the base 1. A support 3 is erected on the base 1, and another upper holding base 2b is integrally mounted on the support 3. The lower holding stand 2a and the upper holding stand 2b constitute a holding stand.

For example, four holding members 4 are provided on each holding table 2a, 2b.

Enlarged views of the holding member 4 are shown in FIGS.
A floating mechanism, which is the main part of the present invention, is provided.

In FIGS. 2A to 2C, holes 5 are bored at both ends of the holding member 4 in a half-split state, and a holding base 2
Holes 6 of the same diameter are also drilled in a and 2b so as to coincide with the axis of the hole 5. A guide pin 7 is driven into the holding bases 2a, 2b from the front to restrict the holding member 4 from rotating in the circumferential direction.

A stepped hole 8 is bored in the vicinity of the hole 5 bored in the holding member 4 (at the lower position in FIG. 2A). The stepped hole 8 has a guide portion 10a, through which a bolt 10 serving as a guide member is inserted, and a spring member is inserted between the step portion of the stepped hole 8 and the head of the bolt 10 along the guide portion 10a. A certain disk spring 12 is fitted, and the threaded portion 10b of the bolt 10 is screwed onto the holding bases 2a and 2b. Therefore, the holding member 4 is attached to the holding bases 2a, 2
b is constantly biased by the biasing force of the disc spring 12 and brought into close contact with the disc spring 12.

Then, the gripping groove 104a, which is a concave gripping portion, of the tool T is engaged with the protrusion 4a, which is an engaging portion, of the holding member 4 of the tool holder, and the tool T is placed thereon, and the tool holder 104 is fitted into the main shaft 105. When unclamping the inserted tool T, when the pull stud 110 of the tool holder 104 is struck by the drawbar 107 from behind inside the main shaft 105, the tool holder 10
4 itself moves forward. This movement pushes the holding member 4 of the tool holder forward. Therefore, the holding member 4 floats against the biasing force of the disc spring 12 between the holding bases 2a and 2b. Further, the holding member 4 is always in close contact with the holding bases 2a and 2b, and the holding member 4 is in close contact with the holding groove 104a of the tool holder 104.
Since the gap between the tool T and the protrusion 4a can be maintained at a minimum, the tool T will not come off from the holding member 4 due to vibration or impact even during transportation.

(6) Effects The tool holder of the present invention has a floating mechanism in the holder, so the fitting tolerance of the holder to the tool holder is reduced, and the tool holder can be placed in close contact with the tool holder at all times. It is possible to prevent troubles during transportation of the tool.

In other words, it is possible to provide a tool holder which is resistant to vibrations and shocks and from which the tool will not fall off even during transportation of the tool holder.
In addition, the tool holder has a simple structure, which makes maintenance easy and economical. Furthermore, the tool holder of the present invention can hold a large number of tools by configuring the holding members in a multi-stage manner.

[Brief explanation of the drawing]

FIG. 1 is a side view of the tool holder according to the present invention. FIG. 2A is a front view of only the tool holding part in FIG. 1, FIG.
FIG. FIG. 3 is a front view of a machining center with a tool storage magazine to which the tool holder of the present invention is applied. FIG. 3 is a sectional view of the main shaft showing an example of attaching and detaching the tool holder to the tool holder according to the present invention using the main shaft. FIG. 4 is a perspective view showing an example of a tool holder applied to a tool magazine of a conventional horizontal machining center.
FIG. 5 is a side sectional view taken in the direction of arrow I in FIG. 4. 1... Pedestal, 2a... Upper holding stand (holding stand),
2b... Lower holding stand (holding stand), 3... Support column, 4
...Holding member, 4a... Protrusion, 7... Guide pin, 10... Bolt (guide member), 12... Belleville spring (spring member), P... Pallet.

Claims (1)

[Scope of utility model registration request] A holder provided for holding a tool used in a machine tool with the axis of the tool in a horizontal direction; a half-shaped holding member that is provided for holding the tool, has an engaging portion that engages with a recessed grip portion of the tool, and is movable on the holding table in the axial direction of the tool;
Provided on the holding stand, restricts the rotation of the holding member in the circumferential direction with respect to the holding stand, prevents the holding member from detaching from the holding stand, and guides the holding member so as to be movable in the axial direction of the tool. and a spring member provided between the guide member and the holding member to urge the holding member in the axial direction of the tool and toward the holding base.