JPS6085845A - Face milling machine automatic-replaceing device of machining center - Google Patents

Abstract

PURPOSE:To allow a machine main spindle to support a milling machine at multiple places and improve machining efficiency by inserting a milling shank section into a machine main spindle shank section and tightening bolts inserted through the milling machine with multiple female screws of the machine main spindle. CONSTITUTION:When a transport unit is operated, a front milling machine 12 is conveyed to immediately below a milling machine fitting section 3A, a transport arm 10 is lifted, and a centering plug 13 and a pull stud 14 are inserted into a taper-like recessed section 6 and is maintained there. When the lift action of the transport unit is completed, a tension unit in a machine main spindle 3 is operated, a draw arm 8 is lifted, and a holder 8A is shrunk to grasp the stud 14 and withdraws it inside the machine main spindle 3. Next, a nut runner 15 is operated to tighten bolts 17 with screws 7, the face milling machine 12 is fixed to the machine main spindle 3 and supported at multiple places, thereby the rigidity of the fitting state is increased and machining efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an automatic face mill changer for a machining center, which is one of the machine tools equipped with an automatic tool changer.

(Prior art) A conventional automatic tool changer installed in a machining center, etc. uses an arm to grip the center of the shank of a tool prepared in a tool magazine, and uses the arm to transport the tool to the vicinity of the tool attachment part of the machine spindle. After that, the tapered protrusion formed on one side of the shank and the pull stud fastened to this were fitted into the four tapered parts formed on the tool attachment part of the machine spindle, and the tool was assembled into the machine spindle. The tool is attached to the machine spindle by retracting the pull stud using a tensioning device. Traditionally, this also applies to face milling.

This device performs automatic exchange.

However, since the diameter of the tapered concave part that holds the tool of the machine spindle 9 is not fixed, the diameter of the tapered convex part of the face milling shank is not fixed. The larger the diameter of the blade part compared to the part, the less stable the face milling cutter is with respect to the machine spindle, and the more difficult it is to withstand cutting resistance. A problem arises in that it is no longer possible to obtain a rigidity of 4J.

Therefore, there are restrictions on the size of the face milling cutter that can be used, the diameter of the blade portion, the amount of N, etc.), and the actual situation is that there is a limit to the improvement of production efficiency.

(Object of the Invention) The present invention has been made in view of the problems caused by the above-mentioned prior art, and its purpose is to:

An object of the present invention is to provide an automatic face milling cutter changing device for a machining center that can improve the rigidity of the attachment state of the face milling cutter to the main shaft of the machine, thereby improving milling efficiency.

(Structure of the invention) In order to achieve the above object, the present invention has the following configuration.

Namely.

It has a milling cutter mount, and carries a front-y-y chair on the milling holder and transports it from a standby position to a milling cutter mounting position on a machine spindle of a machining center, and also attaches the shank portion of the face milling cutter to a shank of the machine spindle. A conveying device that fits into the fitting part.

7 fixedly installed on the milling table and formed on the machine main shaft.
7. Attach a 1f12 m diameter 2% to the bolt hole of the face milling cutter formed to fit the internal thread.7. : With a nut runner that fastens the port to the female thread.

a biasing means for biasing the bolt in a direction toward the female threaded portion via the screw wrench;

Automatic front milling changer for machining centers equipped with

It is.

This configuration is characterized in that it is possible to realize a configuration in which the face milling cutter is supported at a plurality of locations on the main shaft of the machine.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

First, in Fig. 2, 1 is a machining center, 2 is its main body, and 3 is a machine spindle. A tool magazine 4 of a conventional automatic tool changer is fixedly installed on one side of the book 14:2, and a small-diameter face milling cutter 5 is accommodated in the tool magazine 4.

The lower end portion of the machine main shaft 3 is a tool attachment portion 3A, and in the center of the tool attachment portion 3A, there is formed a tapered four portion 6 that becomes a shank insertion portion whose diameter decreases from the lower end toward the nigga. A plurality of female threaded portions 7 (four in this case) are formed at equal intervals in the circumferential direction. Inside the main shaft 3 of the machine, there is provided a tensioning device (not shown) [6] for retracting a pull stand for a large-diameter face milling cutter, which will be described later; 8 is a retraction arm that constitutes a part of this tensioning device; This is the understanding part.

Reference numeral 9 denotes a conveyance device which is fixedly installed on the opposite side of the 9 body 2 from the side where the tool magazine 4 is provided. It is provided at 1a so as not to interfere with the device. This transport device 9 also includes 1iii4 L-shaped transport arm 1
o and a milling stand 1. Milling stand 1
1 is fixed to the end of the transport arm 10 21. A large-diameter face milling cutter 12 is placed on the upper surface of the cutter. The conveyance device 9 carries the face milling cutter 12 on this 72 chair stand 11 and conveys it from the standby position 1 shown in FIG. Face milling cutter 1 depending on function
The centering plug 13 having a tapered convex shape and the pull stud 14 fastened to the tip thereof, which constitute a part of the shank portion of the cutter 2, are fitted into the tapered recess 6 of the machine main shaft 3, and the centering plug 13 on the machine of the face milling cutter 12 is inserted There is no positioning with respect to the angle of 71 degrees. In addition, slice table 1
A centering post IIA is provided protruding from the center of the 14th surface of the mount 1, and this centering boss IIA is fitted into a centering hole 12A formed in the center of the face milling cutter 12. , the position of the face milling cutter 12 on the slice table 11 is determined. Similarly, the above-mentioned centering plug 13 also has its centering boss portion 1.
3A is fitted and fixed to the centering hole 12A.

The milling cutter stand 11 consists of an enlarged diameter part 11B, IIC and a reduced diameter part 11D located between them.
A wrench hole IlK is formed near the radially reduced diameter portion 11D of the IC, into which a nut runner hole (to be described later) is loosely inserted.
I'm at %. An air-type or electric-type nut 2 nut 15 is fixed to the lower end of the milling table 11.
Tee 16 is loosely inserted into wrench insertion hole 11K as described above 71.
I'm here. This nut runner 15 is fitted into the bolt hole 12B of the face milling cutter 12 formed to match the female threaded portion 7 formed on the main shaft 3 of the machine 21. This is for fastening the threaded port 17 to the female threaded portion 7.

A spring receiving member 18 is attached to the wrench 16 of the nut runner 15, and the spring receiving member 18 and the milling table 1
A coil spring 19, which serves as a biasing means, is fitted between the coil spring 19 and the enlarged diameter portion 11C of the coil spring 1 and the enlarged diameter portion 11C of the spring 1. With this configuration, this coil spring 19 is connected to the runner 16?
! Forces port 17 upward via E-.

That is, it is adapted to bias the female threaded portion 7 of the mechanical main body 3 in a direction.

Next, the action will be explained.

First of all, all of the runners 16 of Natsutranna 15, Porto 1
7 by fitting it into the wrench hole (not shown), then set the centering hole 12A of the stop milling cutter 12 and the bolt hole 1.
2B and 2"L, center the boss part 11A and bolt 1.
7, and finally, the centering boss portion 13A of the centering plug 13 for centering the machine main shaft 3 and the centering hole 12A are fitted to the standby state shown in FIG.

Next, when the transport device 9 is activated, its transport arm 10
rotates and transports the face milling cutter 12 to just below the milling cutter mounting portion 3A of the machine main shaft 3, and the transport arm lO
rises, and the centering plug 13 and Solstad 14
is inserted into the tapered recess 6 and maintained in that state for a while. At this time, the tip of the bolt 17 faces the female threaded portion 7.

When the lift operation of the conveying device 9 is completed, a tension device (not shown) in the main shaft 3 of the machine is activated, and at the same time as the retracting arm 8 rises, the expanding gripping portion 8A contracts and pulls the pull stud 14 into the second position. As shown in the figure, grip 1 and pull it inside the machine main shaft 3.

Next, the nut runner 15 is operated, the bolt 17 is rotated by the wrench 16, and the bolt 17 is tightened by the female threaded part 7, and the face milling cutter 12 is fixed to the milling cutter mounting part 3A of the machine main shaft 3. Ru. By Koi L.

Since the face milling cutter 12 is supported at a plurality of points (supported at five points in this case), the rigidity of the face milling cutter 12 in the suspended state is increased.

(Effects of the Invention) As is clear from the above description, the present invention provides 21. For example, since it is possible to automatically support the front flat rice at multiple locations on the machine spindle, it is possible to reduce restrictions due to the diameter size and weight of the blade part in masonry cutting centers (especially vertical manning centers). , and the additional rigidity is improved, resulting in the effect that the efficiency of milling is greatly improved by C.

In addition, since a stop milling cutter with a wider IN than the conventional one can be used, the accuracy of workpiece machining [i] can be improved as described above.

[Brief explanation of the drawing]

, 41 is an overall view of the automatic face milling cutter changing device of the manninog center of the present invention when it is in a standby state, and FIG. 2 is an enlarged sectional view of the main part showing a state in which the face milling cutter is attached to the main shaft of the machine. l: Masininogusenota, 3: Iso v & main axis, 6:
Insertion part, 7: Female thread part, 9: Conveying device. 11: Near rice holder, 12: Two front milling cutters, 13: Centering plug, 15: Nut runner, 17: Porto, 19: Coil spring patent applicant, Toyota Motor Corporation representative, patent attorney Yumi Sae (and 1 other person)

Claims (1)

[Claims] (1) It has a milling cutter, and carries the face milling cutter on the milling cutter and transports it from the standby position to the milling cutter mounting position on the machine spindle of the machining center, and also inserts the shank portion of the face milling cutter into the shank insertion portion of the machine spindle. A conveying device to be inserted. a nut runner, which is fixedly installed on the milling cutter stand and which tightens a bolt inserted into a bolt hole of the face milling cutter, which is formed to match the female threaded portion formed on the machine main shaft, to the female threaded portion; urging means for urging the bolt in a direction toward the female threaded portion via a wrench of the nut runner; Automatic front milling changer for machining centers.