JPH03190608A - Cooling water intrusion preventing system of turret type machine tool - Google Patents

Abstract

PURPOSE:To improve a seal function to dispense with a sealing work and thereby facilitate automated replacement of gear heads by providing an air supply means for jetting compressed air from the inside of a turret, at the connection between the turret and the respective gear heads. CONSTITUTION:A turret 11 of a turret cutting machine 10 is provided with a gear head 12 on its circumference and a turrent rotating system 13 and a tool drive system 26 therein. An air pipe 40 for introducing compressed air from a compressed air supplier outside the turret 11 and joint 41, in which turret 11 air passage 42, 43, 44 are provided to reach a space 45 difined by the circumference of a column 15. Though cooling water tends to enter in the turret 11 from the gap of the connected part between the gear head and the turret, the compressed air is jetted in the direction C from the gap via the through hole 11a of the turret 11 from the space 45. It is thus possible to prevent the cooling water from entering.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is directed to a turret-type machine tool in which cooling water (coolant) is supplied from the joint between the indexing and rotating turret and each gear head attached to the turret. This invention relates to a cooling water intrusion prevention mechanism that reliably prevents the intrusion of cooling water.

(Prior art) Conventionally, in turret-type machine tools, when installing gearheads with tools on each of the four mounting surfaces of the turret, the joints between the turret and each gearhead are filled with a sealant and cooling water is applied. The turret is configured to prevent water from entering into the turret through the joint.

(Problem to be solved by the invention) However, although such a seal structure functions as a seal at the beginning of filling, once the gear head is installed, it is used continuously for a considerable period of time, so vibrations and Due to the deterioration of the sealant over time, a gap gradually appears in the joint, allowing cooling water to undesirably infiltrate into the turret.

Further, the necessity of sealing work as described above also becomes a factor that hinders automation of gear head replacement.

An object of the present invention is to solve the above-mentioned problems by supplying compressed air from inside the turret toward the gear head and eliminating the seal.

(Means for Solving the Problems) For this purpose, the cooling water intrusion prevention mechanism for a turret-type machine tool of the present invention has a plurality of gear heads each equipped with a tool provided on the turret, which are selected by index rotation. A turret-type machine tool for machining a workpiece using a gear head, characterized in that an air supply means is provided for supplying compressed air from inside the turret to a connecting portion between the turret and each of the gear heads.

(Function) In the present invention, since the turret type machine tool is provided with an air supply means for supplying compressed air from inside the turret to the connection portion between the turret and each gear head, the turret type machine tool can be used to process a workpiece. When performing this, even if cooling water is applied to the selected gearhead to cool it, the flow of compressed air in the joint can reliably prevent the cooling water from entering the inside of the turret. .

In this way, the sealing function can be improved as desired, which also eliminates the need for sealing operations and facilitates the automation of gearhead changes.

(Example) Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a sectional view showing the structure of a first embodiment of the cooling water intrusion prevention mechanism for a turret type machine tool of the present invention.
indicates a turret-type machine tool (the left side of the diagram is above the machine tool).

A square turret 11 of a turret machine tool 10 has gear heads mounted on four mounting surfaces around it (a gear head 12 is shown as an example in FIG. 1).

The turret rotation mechanism 13 that rotates the turret 11 includes a box-shaped base 14 and a support 15 integrally formed in the center of the base 14. The support 15 supports the turret 11.
The turret 11 is supported rotatably around an axis extending in the horizontal direction via a bearing 16 and a piston and cylinder which will be described later.

Inside the base 14, a ring-shaped gear 1 is fixed to the lower end of the turret 11 so as to be concentric with the axis A.
A gear 18 that meshes with 7 is arranged, and this gear 18
A shaft 19 that rotatably supports the is coupled to a drive shaft of a servo motor (not shown) via two meshing bevel gears (not shown). Here, this servo motor rotates the turret 11 by an arbitrary angle in response to a feedback signal regarding the turret rotation angle from a not-shown rotary encoder coupled to the gear 17 via a bevel gear (not shown). be able to.

Further, inside the base 14, index teeth 21 are fixed to the turret 11 and are paired with index teeth 20 radial with respect to the axis A. These index teeth 20 and 21 are horizontal (
A cylinder 23 fitted so as to be movable in the vertical direction (in the figure) moves forward and backward together with the turret 11 by selectively supplying hydraulic pressure to oil chambers 23a and 23b defined by the piston 22 and cylinder 23, thereby engaging or engaging the cylinder 23. Separate. In other words, by supplying hydraulic pressure to the oil chamber 23a, the indexing tooth 20
．． If 21 is separated, the turret eye l can rotate freely, and if hydraulic pressure is supplied to the oil chamber 23b and the indexing teeth 20 and 21 are engaged as shown, the turret 11 can be indexed as desired. Angle (e.g. 90° 180°, 270”,
360°,...) can be positioned and fixed with high precision and reliability.

On the other hand, a flange 25 for attaching a motor 24 is fixed to the tip of the column 15, and a tool drive mechanism 26 is provided inside the column 15. This tool drive mechanism 26 meshes with a bevel gear (not shown) that is coupled to an input shaft 27 that is spline-fitted to the output shaft 24 & of the motor 24.
The motor 2 has a bevel gear (not shown) rotatably supported around a horizontal axis B perpendicular to the axis A.
The driving force from 4 is transmitted to an output shaft 28 spline-fitted to the inner surface of this bevel gear. The output shaft 28 has a sleeve 2 formed with a rack extending in the direction of the axis B on the outer peripheral surface.
Binion 3 is supported by 9 and meshes with this rack.
0 is pivoted within the post 15. This pinion 30 is axially connected to a pinion 32 that meshes with a rack 31 that is connected to a piston rod of a cylinder (not shown).

By operating the cylinder and moving the sleeve 29 forward and backward through the two sets of racks and pinions,
When the gear head 12 is located at the processing position (in FIG. 1, on the extension line of the axis B, on the back side of the page) by the index rotation, the output gear (not shown) connected to the end of the output shaft 28 is advanced, and the gear is rotated. The shaft 3 in the gear head is meshed with the input gear 33 of the gear head 12 and driven by the driving force from the motor 24.
4. Tool 3 passes through gears 35, 36 and spindle 37 in sequence.
8 can be driven, and the indexing time of the turret eye 1,
During operation, the output gear can be moved backward and away from the input gear.

In the first embodiment, a mechanism for supplying compressed air to prevent cooling water from entering the turret type machine tool 10 is provided as follows. That is, the other end of the air pipe 40, which has one end connected to a compressed air supply device (not shown) outside the turret type machine tool 10, is connected to the air passage 42 provided in the flange 25 via the joint 41, and then The air passage 43 communicating with the air passage 42 of the knee is connected to the piston 22.
An air passage 44 is provided within the strut 15 and communicates with the air passage 43.

It is assumed that this air passage 44 has an opening on the side surface of the column 15 toward a space 45 defined by the column 15, the turret [1, the cylinder 23, and the bearing 16].

Next, the operation of the cooling water intrusion prevention mechanism of the first embodiment will be explained. First, if the gear head that is positioned and fixed so as to face the work by index rotation is, for example, the gear head 12 shown in FIG. 1, then this gear head 12
Cooling water is applied to the

If a gap is formed at the joint between the turret 11 and the gear head 12 as shown in the figure due to deterioration of the sealant over time, etc., cooling water tends to enter the inside of the turret 11 through this gap. On the other hand, when compressed air is supplied from the compressed air supply device to the air pipe 40, this compressed air passes through the air passages 42, 43 and 44 in sequence and reaches the space 45,
Since this space 45 is defined in a cylindrical shape around the axis A around the support 15, the air is ejected from the gap through the through hole 11a of the turret 11 in the direction of arrow C in the figure.
To reliably prevent the aforementioned cooling water from entering.

In this way, the sealing function can be improved as desired, which also facilitates the automation of gearhead changes by eliminating the need for sealing operations.

FIG. 2 is a sectional view showing the structure of a second embodiment of the cooling water intrusion prevention mechanism for a turret type machine tool of the present invention, and the same parts as in the first embodiment are given the same reference numerals.

In this second embodiment, measures are taken to prevent cooling water from entering on the gear head 46 side as well. That is, in the first embodiment, a seal was fitted to the end surface of the gear head 46 through which the shaft 34 passes, but this was abolished and the shaft 34 was fitted instead.
An air passage 47 having a diameter larger than the outer diameter of the spindle 37 is provided, and an air passage 48 communicating with a space in which the spindle 37 is fitted is provided on the same axis as the spindle 37.

In the cooling water intrusion prevention mechanism of this second embodiment, the compressed air supplied from the compressed air supply device is supplied to the space 45,
Through the through hole 11a, the gear is guided into the inside of the gear head 46 as shown by arrows and arrows E in FIG.
Static pressure will be applied to 6. As a result, firstly, it is possible to reliably prevent cooling water from entering the turret from the end face through which the shaft 34 of the gear head 47 passes without a seal, and secondly, the spindle can be fitted from the outside. Seal 49 in Figure 2 prevents cooling water from entering the space.
This can be reliably prevented even if the product deteriorates over time.

FIG. 3 is a sectional view showing the structure of a third embodiment of the cooling water intrusion prevention mechanism for a turret type machine tool of the present invention, and the same parts as in the first embodiment are given the same reference numerals.

In this third embodiment, the through hole 11 of the turret 11
The compressed air guided to the gear head 50 is further guided to the labyrinth seal 54 through an air passage 51, an air pipe 52, and an air passage 53 provided in the gear head 50 (the air passage is constituted by air pipes outside the gear head). Alternatively, an air passage may be provided inside the gearhead 50 leading to the labyrinth seal 45).

This leads compressed air to the labyrinth seal 45,
The sealing effect of the labyrinth seal 45 can be made even more reliable.

(Effects of the Invention) Thus, since the cooling water intrusion prevention mechanism of the turret type machine tool of the present invention supplies compressed air from inside the turret toward the gear head, the sealing function can be improved as desired. This eliminates the need for sealing work and promotes automation in the gearhead direction.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the structure of a first embodiment of the cooling water intrusion prevention mechanism for a turret type machine tool of the present invention, and FIG. 2 is a second embodiment of the cooling water intrusion prevention mechanism for a turret type machine tool of the present invention. FIG. 3 is a sectional view showing the structure of a third embodiment of the cooling water intrusion prevention mechanism for a turret type machine tool of the present invention. 10... Turret type machine tool 11... Turret 13... Turret rotating mechanism 24... Motor 37... Spindle 40... Air piping... Gear head... Support column... Tool drive Mechanism...Tools 43, 44...Air passage

Claims (1)

[Scope of Claims] 1. A turret-type machine tool in which a plurality of gear heads equipped with tools are disposed on a turret, and a workpiece is machined by a gear head selected by index rotation, comprising: A cooling water intrusion prevention mechanism for a turret-type machine tool, characterized in that an air supply means is provided for supplying compressed air from inside the turret to a joint with a gear head.