JPS6128675Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a work in which a large diameter tool such as a face milling cutter is fixed to the outer periphery of the tip of the spindle, and the tool is attached to and removed from the insertion hole of the spindle through a hole in the center of the milling cutter. It's about machines.

This type of machine tool is known from Japanese Utility Model Publication No. 51-41261, but when processing with a face milling cutter, the tool cannot be inserted into the tool insertion hole in the center of the spindle. ,
There is a risk that chips may enter and adhere to the insertion hole, which poses a problem when other machining is performed by inserting a tool into the insertion hole.

In order to eliminate such problems with conventional equipment, the present invention is designed to insert a plug member into the tool insertion hole that does not protrude forward from the cutting edge position of the milling cutter when processing with a face milling cutter. In addition, the plug member is configured to allow attachment and detachment operations to be performed with respect to the tool insertion hole using an operating means having a grip portion of the plug member.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a machine tool 10 with an automatic tool changer. Machining is performed using a single tool attached to the machine, and a tool magazine for storing a large number of tools is not provided for convenience. One tool T is held at one end of the tool changer 20 and inserted into the tool insertion hole 11a of the spindle as appropriate. A spindle head 13 that rotatably supports the spindle 11
is slidably guided along a vertical guide surface 14a formed in the column 14. A circular table 15 on which a workpiece W can be placed and indexed is provided on a table 17 that can be slid in the left and right direction while being guided by a saddle 16. It is slidably guided in a direction perpendicular to. A tool changer 20 is provided at the top of the column 14. As shown in FIGS. 2 and 3, this tool changer 20 has a swing arm 23 fixed to one end of an operating shaft 22 which is rotatably and axially movably supported on a support body 21. A tool gripping part 24 for gripping the tool T is provided at one end of the arm 23, and a gripping part 25 for gripping the plugging member 40 is provided at the other end. A joint member 26 that allows rotation but prevents relative movement in the axial direction is provided at the other end of the operating shaft 22. The joint member 26 is connected to a piston rod 28 of a cylinder 27 bored in the support body 21 and is moved back and forth in the axial direction. It is becoming more and more like this. A spur gear 29 is carved on the outer circumferential surface of the operating shaft 22, and this spur gear 29 meshes with a rack 30 connected to a cylinder (not shown) to perform 90-degree and 180-degree turning movements.

The gripping portion 25 of the plugging member 40 provided at the other end of the swing arm 23 has a pair of gripping claws 36 rotatably supported on a pivot 35 in a plane that includes the axis of the operating shaft 22. A protrusion 36a that engages with an engagement groove 41 formed in the inner hole of the plug member 40 is provided at the tip of the gripping claw 36, and a pivot arm is provided at the end opposite to the pivot 35. A spring 38 is compressed between a spring receiving member 37 fixed to the spring 23 and urges the protrusion 36a in the expanding direction. Further, a cylindrical guide member 39 is provided around the gripping claw 36 so as to protrude from the rotating arm 23, and is engaged with the inner hole opening 42 of the plugging member 40.
It acts to prevent misalignment.

As shown in FIG. 4, a face milling cutter 45 is fixed to the outer peripheral surface of the tip of the spindle 11 which is supported by the spindle head 13, and a face milling cutter 45 is fixed at the center of the milling cutter 45, which is slightly larger than the tool insertion hole 11a. A through hole 46 is drilled through the hole 46, and the tool T or plugging member 4 is inserted through the through hole 46.
0 is inserted into the tool insertion hole 11a. A draw bar 48 is provided at the center of the spindle 11 to engage with and pull a pull stud 47 protruding from the tool T and plug member 40. The state in which the tool T is inserted into the insertion hole 11a is shown by a solid line in FIG. 4, and the state in which the filling plug member 40 is inserted is shown in a two-dot chain line. As can be seen from this, when the plugging member 40 is inserted, the milling cutter 45
The plugging member 40 is configured not to protrude forward beyond the cutting edge position of the plugging member 40.
Inner hole gripping is performed to attach and detach the When the tool T is inserted into the tool insertion hole 11a of the spindle 11, desired machining is performed using the tool T. In this state, the plug member 40 is held by the grip portion 25 at one end of the swing arm 23. Next, when machining is performed using the face milling cutter 45, the spindle head 13 is positioned at the tool exchange position at the rising end, the swing arm 23 is turned 90 degrees counterclockwise from the state shown in FIG.
Grip the tool T with the handle, move it forward in the axial direction, and pull out the tool T. Next, turn the swing arm 23 clockwise.
Turn the stopper member 40 180 degrees to face the insertion hole 11a, move it back in the axial direction, insert it into the insertion hole 11a, and pull the pull stud 47 with the drawbar 48.
Pull in and clamp. Then the rotating arm 23
When moved forward, the gripping claw 36 and the engagement groove 41 are disengaged, the plug member 40 is moved forward, and the cap member 40 is returned to its original position by returning 90 degrees counterclockwise. Since the insertion hole 11a is closed by the plugging member 40, the intrusion of chips is prevented even during processing with the milling cutter 45, and the tool insertion hole 11a is always kept in a clean state, so that the tool insertion hole 11a is always kept clean. Tool mounting accuracy can be maintained at a high level of accuracy.

According to the present invention, an engagement groove 41 is formed in the inner diameter part of the plugging member 40, and a gripping claw 36 that engages with the engagement groove 41 is provided, and an operating means for attaching and detaching the tool to the tool insertion hole is provided. Therefore, there is no need for any special means such as the structure of the spindle, especially for making the plug member protrude from the milling cutting blade position during attachment/detachment, so that existing machines can be modified without changing the spindle built-in mechanism. In addition, the insertion hole 11a can be closed with the plug member 40 that does not protrude forward from the cutting edge position of the milling cutter, so that chips will not enter the insertion hole even during face milling, and the insertion hole will be prevented. This method has the advantage of not damaging the inner surface of the hole and the shank portion of the tool, and can maintain high machining accuracy over a long period of time.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of a machine tool to which the present invention is applied, FIG. 2 is an enlarged cross-sectional view taken along the line - in FIG. 1, and FIG. A view from arrow A, Fig. 4 is - in Fig. 1.
FIG. 11...Spindle, 11a...Insertion hole, 20
...Tool exchange device, 23...Swivel arm, 24...
... Tool gripping part, 25 ... Gripping part of plugging member, 3
6...Gripping claw, 38...Spring, 39...Guide member, 40...Plug member, 41...Engagement groove.

Claims (1)

[Claims for Utility Model Registration] (1) A spindle having an insertion hole into which a tool is to be inserted, a tool changer for changing the tool to be inserted into the spindle, and a tool changer fixed to the outer periphery of the tip of the spindle. In a machine tool equipped with a face milling cutter, a plug member is provided that is removably inserted into the insertion hole and does not protrude forward from the cutting edge position of the face milling cutter in the inserted state, and the end face of the plug member is An inner diameter gripping portion is drilled in the hole, a gripping claw that engages with the inner diameter gripping portion is provided in a protruding manner, and a means is provided for attaching and detaching the filling plug member to the insertion hole, and when processing with a face milling cutter, A machine tool that processes the plug member by inserting it into an insertion hole. (2) Utility model registration claim 1, characterized in that the gripping portion has a guide member that projects to fit into the inner hole opening of the plugging member and has a misalignment prevention function. Machine tools listed.