JPH07110444B2 - Vertical milling machine spindle head - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical milling machine, and more particularly to a spindle head of a vertical milling machine for cutting and molding a mold surface of a synthetic resin product molding die, for example. [Prior Art and Problems Thereof] Conventionally, as a vertical milling machine for cutting and molding the mold surface of a molding die of a synthetic resin product of this type, generally, a vertical milling machine having a nominal capacity of 2 or 3 has been used. There is. The spindle speed of the spindle head of the milling machine with the nominal capacity of 2 or 3 is 500 to 2200 rpm at high speed and 10 to 10 at low speed.
The one with 500 rpm was the general specification. However, in cutting and molding the mold surface, for example, when cutting a forming groove of about 2 mm, the end mill diameter is about 5 mm in the rotation speed range of the above spindle. When rotating at a maximum of 2000 rpm, the bearing generated heat, and there was a problem that the rotation was insufficient and the cutting ability was reduced, and the end mill was broken. For this reason, various rotation speed converters have been developed as attachments attached to the tip of the spindle, but these converters are very troublesome to attach and detach, and it takes time to set up, and it also hinders the spindle feed rate. However, it is uneconomical to prepare a milling machine having a high-speed rotating spindle head.

The present invention has been made to solve the above-mentioned conventional problems, and in a spindle head having a maximum spindle rotation speed of 2200 rpm, a high-speed rotation shaft is provided coaxially with the spindle to provide general-purpose die surface cutting in the same model. The purpose of the present invention is to provide a spindle head of a vertical milling machine that can improve the productivity.

[Means for Solving the Problems] In order to solve the above technical problems, the present invention is a spindle head of a vertical milling machine, which is rotatably installed vertically on the spindle head and is connected to a general drive system of the vertical milling machine. Milling body spindle, and a bearing portion provided on the chuck and the upper portion of the milling body spindle, wherein a chucking taper portion is provided below the shaft hole penetrating the center of the milling body spindle. The rotary shaft of the inverter motor is rotatably provided coaxially with the rotary shaft, and a joint recess is formed in the upper and lower ends of the high speed rotary shaft, and the upper end joint recess is provided above the spindle head. Via the intermediate shaft, and the lower joint recess is detachably connected to the spindle of the high-speed collet chuck that is detachably attached to the chuck attached to the main body spindle. Is a spindle head of a vertical milling machine in which a high-speed drive system is formed so that the general drive system and the high-speed drive system can be switched and driven.

[Operation] With the above configuration, it is possible to perform a cutting operation with a large-diameter milling machine by the milling machine spindle that is normally driven by the general driving system of the milling machine.
When a high-speed collet chuck is attached to the chuck attached to the milling machine spindle, this spindle is fitted and connected to the joint recess of the high-speed rotating shaft of the high-speed drive system linked to the inverter motor, and is ideal for small diameter end mills attached to the collet chuck. The number of rotations can be given.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 denotes a spindle head of a vertical milling machine, and a support portion (not shown) is provided in a cover body 2 of the spindle head 1. The milling machine spindle 3 is rotatably installed vertically through the
The main body spindle 3 is connected to a rotation speed conversion drive mechanism (not shown) which is a general drive system of a milling machine, and is also connected to a vertical feed mechanism (not shown) slidably in the vertical direction. A shaft hole 4 is formed through the center of the milling machine spindle 3 so that a high-speed rotating shaft 14, which will be described later, can be inserted and supported, and a mounting flange 6 is formed at the lower end of the body spindle 3.
Is formed, and a taper portion 7 into which the shank 9 of the chuck 8 is fitted is formed in the chuck attachment portion 5 at the lower end of the shaft hole 4, and the chuck attachment portion 5 is formed. Has a chuck 8 attached thereto.

This chuck 8 is a conventionally known one, and this chuck 8 is formed with a shank 9 fitted to the taper portion 7 of the main body spindle 3 and a flange 10 which is attached to the attachment flange 6 by a bolt 39, a tool, etc. A chuck part 11 for detachably mounting is formed, and a mounting hole 12 that is aligned with the shaft center of the main body spindle 3 is formed at the same center.
On the upper end side of the shank 9 shown in the figure, the bearing portion of the high-speed rotating shaft 14 is provided.
13 are formed. In this way, in the shaft hole 4 of the main body spindle 3 to which the chuck 8 is attached, the high-speed rotating shaft is aligned on the same axis.
14 is rotatably provided.

The high-speed rotation shaft 14 is rotatably supported between a bearing portion 19 formed on the upper end of the main body spindle 3 in the figure and a bearing portion 13 of the chuck 8 so as to be rotatable concentrically with the axis of the main body spindle 3. Stepped shaft portions 15 and 16 which are fitted and supported by upper and lower bearing portions 19 and 13 are formed on the end side, and an upper and lower parts of the main body spindle 3 are formed at the center of the upper end portion by an intermediate shaft 25 described later. A slide hole 17 having a predetermined length, which constitutes a sliding joint corresponding to feeding, is bored along the axis, and the upper end of the slide hole 17 has a substantially polygonal cross section (this example In the example, the hexagonal shape is shown).
In addition, a fitting hole 18 that forms a fitting joint with a spindle 34 of a high-speed collet chuck 26, which will be described later, is formed in the lower end of the high-speed rotating shaft 14. The fitting hole 18 is also formed in a substantially polygonal cross section (hexagonal shape) like the slide hole 17. The stepped shaft portion 16 of the high-speed rotating shaft 14 thus formed is fitted into the bearing portion 13 of the chuck 8 and is fitted into the fitting hole 18 thereof.
Is desired at a predetermined height position of the mounting hole 12, and the upper end side is rotatably supported via a bearing portion 19 composed of a cap body 20 and a bearing 21 screwed to the upper end of the main body spindle 3. Is integrally assembled on the axis of the main body spindle 3.

Reference numeral 23 is, for example, an inverter motor (4P, 0.75KW) attached to the upper part of the cover main body 2 via a motor base 22, and its rotation shaft 24 is provided coaxially with the high-speed rotation shaft 14 and has the same rotation shaft. 24 is a slide hole formed on the high-speed rotating shaft 14.
An intermediate shaft 25 having a shaft portion having a substantially hexagonal cross section that is slidably fitted to 17 is attached. The high-speed rotation shaft 14 connected to the inverter motor 23 is given a rotation of 400 to 6000 rpm. The motor 23 is appropriately selected depending on the work.

26 is a collet chuck for high speed which is attached to the chuck 8 of the main body spindle 3, and has a small diameter end mill (2φ
~ 10φ) M is removable, and the chuck body 28 is composed of a shank 29 and a head portion 30.
An insertion hole 31 of the spindle 34 is formed through the shaft center of 28,
Bearings 32 and 33 are provided above and below the main body 28, and a spindle 34 is rotatably supported. A fitting shaft portion 35 having a substantially hexagonal cross section is formed at the upper end of the spindle 34 in the drawing so as to be removably fitted into the fitting hole 18 of the high speed rotating shaft 14, and a collet 36 is detachably screwed at the lower end of the fitting shaft portion 35. A cap 37 is screwed on and the end mill M is detachably provided. Also,
A cooling casing 38 is rotatably provided on the outer periphery of the head portion 30 so as to cool the bearing portion 33. Further, the mounting length of the high-speed collet chuck 26 is formed to have a general specification in which the main body spindle 3 is not supported for vertical feeding.

In this way, the intermediate shaft 25, the high-speed rotating shaft 14, and the spindle 34, which are linked to the rotating shaft 24 of the inverter motor 23, form a high-speed drive system.

As described above, the spindle head 1 of this example is rotatably installed vertically on the spindle head 1 and is driven by the milling machine spindle 3 which is driven to be linked to the general drive system of the vertical milling machine. A tapered portion 7 for attaching a chuck is provided below the penetrating shaft hole 4, and high speed rotation is performed via a chuck 8 attached to the tapered portion 7 and bearings 13 and 19 provided on the upper portion of the milling machine spindle 3. The shaft 14 is rotatably provided coaxially, and a slide hole 17 and a fitting hole 18 which are joint recesses are formed in the upper and lower ends of the high-speed rotation shaft 14, and the slide hole 17 is provided above the spindle head 1. Inverter motor provided
23 rotary shafts 24 are connected via the intermediate shaft 25, and the lower fitting hole
Reference numeral 18 forms a high-speed drive system that is detachably connected to the spindle 34 of the high-speed collet chuck 26 that is detachably attached to the chuck 8 that is attached to the milling machine spindle 3, and drives by switching between the general drive system and the high-speed drive system. Since it is configured so that, for example, when cutting the molding surface of a mold, or when molding with a large diameter milling machine, it is mounted on the chuck 8 mounted on the main body spindle 3 and the required number of rotations of the main body spindle 3 is reached. In the case of a small diameter end mill M for cutting and forming a forming groove such as rib forming on the same forming surface, a small diameter end mill M is attached to the high speed collet chuck 26. When the shank 29 is inserted into the chuck 8, the fitting shaft portion 35 formed on the spindle 34 is fitted into the fitting hole 18 of the high speed rotation shaft 14. , Thereby the chuck 8 to secure tightening. Then, by activating the inverter motor 23, the rotation passes through the intermediate shaft 25, the high speed rotation shaft 14, and the spindle 34, and the end mill M having a small diameter is rotated at 400 to 6000 rpm to cut a predetermined forming surface.

(Effects of the Invention) Since the present invention has the above-described configuration, cutting and forming with a large-diameter end mill, a milling machine or the like is performed by a milling machine spindle that is driven to be connected to a general drive system of a milling machine, and a small diameter The cutting by the end mill can be performed by giving rotation to the high-speed rotation shaft of the high-speed drive system coaxially provided in the shaft hole of the milling machine spindle by the inverter motor. Since there is no need to install a rotation speed conversion device, the versatility of the same model can be improved, and this high-speed collet chuck can be installed in the same way as normal tool installation.
Since the work can be cut and formed on the table without removing the work, the work efficiency can be improved. Further, an optimum rotation speed can be given to the small-diameter end mill, and the tool life can be secured.

[Brief description of drawings]

The drawings show one embodiment of the present invention. Fig. 1 is a longitudinal sectional view of a spindle head, Fig. 2 is a sectional view taken along line II-II of Fig. 1, and Fig. 3 is also III-III of Fig. 1. It is a line sectional view. 1 …… Spindle head 3 …… Milling machine spindle 4 …… Shaft hole 5 …… Chuck mounting part 7 …… Taper part 8 …… Chuck 13,19 …… Bearing part 14 …… High-speed rotating shaft 17 …… Slide hole ( Joint recess 18) Fitting hole (joint recess) 23 …… Inverter motor 26 …… High speed collet chuck 34 …… Spindle

Claims (1)

[Claims] 1. A spindle head of a vertical milling machine, which is rotatably installed vertically on the spindle head and is driven to be connected to a general drive system of the vertical milling machine, and a milling body spindle which penetrates through the center of the milling body spindle. A tapered portion for chuck attachment is provided below the established shaft hole, and a high-speed rotation shaft is rotatably provided coaxially through a bearing provided on the chuck attached to the tapered portion and the upper part of the milling machine spindle. At the same time, joint recesses are formed in the upper and lower ends of the high-speed rotary shaft, and the rotary shaft of the inverter motor provided above the spindle head is connected to the upper end joint recess via an intermediate shaft, and the lower joint recess is formed in the main body. A high-speed drive system that is detachably connected to the spindle of the high-speed collet chuck that is detachably attached to the chuck attached to the spindle, and the general drive system and the high-speed drive system are formed. Switching drivable configuration the vertical milling spindle head.