JPH0718516Y2 - Cutting oil supply device - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention removes chips and cools the tool by allowing cutting oil to flow through the tool such as a drill, boring, and reamer and flowing out from the tip of the tool. The present invention relates to a cutting oil supply device.

(Prior Art) In drilling, boring, boring, reaming, etc., that require deep holes and high precision, cutting oil is sprayed on the tip of the tool, which is the cutting part, to remove chips. However, conversely, the cutting powder may be pushed into the hole due to the blowing of the cutting oil, so that the cutting powder may not be removed smoothly. Moreover, especially in the case of drilling small diameter holes, it is necessary to make the diameter of the tool attachment part larger than the hole diameter in order to secure the rigidity of the tool.However, this large diameter attachment part is sprayed with cutting oil to the opening of the hole. However, even if a cutting oil is sprayed from the outside, the chips cannot be removed, and in the case of a tool rotating at a high speed, the cutting oil is scattered by the tool and does not reach the cutting portion.

As a countermeasure against this, a cutting oil supply hole is opened at the tip of the tool, and cutting oil is made to flow out from the tip of the tool to cool the cutting edge and remove chips from the cutting portion. To guide the cutting oil to the rotating tool tip, a cutting hydraulic feeder is installed at the rear end of the hollow spindle, and the tip of the tool attached to the tool holder is inserted through the hollow part of the spindle and the hollow part of the tool holder. Measures for supplying cutting oil from the opened cutting oil supply hole to the cutting portion, as disclosed in Japanese Utility Model Publication No. 63-7488,
There is a method of providing a cutting hydraulic pressure supply device in front of the spindle so as to supply the cutting oil from a cutting oil supply hole opened at the tip of the tool to the cutting portion.

(Problems to be solved by the invention) Generally, the former measure is adopted in which a cutting hydraulic feeder is provided at the rear end of the spindle. However, in a turret type machine tool that holds a plurality of tools, each spindle is structurally It is difficult to provide a cutting hydraulic feeder at the rear end. In the latter method, in which a cutting hydraulic feeder is installed in front of the spindle, the distance from the bearing that rotatably supports the spindle to the machine tool body to the tool tip, which is the cutting section, becomes large, and the rigidity of the spindle is increased. , It is difficult to secure machining accuracy, and if the spindle is rotated at a large diameter to secure rigidity, the peripheral speed of the oil seal part of the cutting hydraulic feeder will increase, which causes heat generation and durability problems. .

Therefore, an object of the present invention is to provide a cutting oil supply device capable of reducing the distance from a bearing that rotatably supports a spindle to the tip of the tool, ensuring the rigidity of the spindle, and improving the machining accuracy. .

(Means for Solving the Problems) In order to achieve the above object, the present invention provides the above cutting oil for a tool, which is attached to a spindle of a machine tool via a tool holder and has a cutting oil supply hole opened at the tip of the tool. In the cutting oil supply device for supplying cutting oil from the outer peripheral portion of the tool holder to the supply hole, at the bearing end portion of the spindle,
A bearing retainer lid is provided in which part of the inner peripheral surface is in contact with the outer peripheral surface of the tool holder, and the bearing retainer lid extends from the outer periphery to the inner peripheral direction and leads to an annular groove formed in the inner periphery. An oil introduction hole is provided, and a guide groove is formed on the outer peripheral surface of the tool holder so as to face the annular groove and becomes gradually deeper as it moves in the direction opposite to the cutting rotation direction of the tool in the circumferential direction. A communication hole that is opened at the deep bottom of the guide groove and communicates with the cutting oil supply hole of the tool is provided.

(Function) The cutting oil guided from the outer peripheral portion of the bearing pressing lid to the cutting oil introducing hole is supplied to the cutting hydraulic pressure feeding means constituted by the annular groove formed in the bearing pressing lid and the spiral guide groove formed in the tool holder. And is pressure-fed by the cutting hydraulic pressure feeding means that is operated by the rotation of the tool holder that is rotationally driven via the spindle, and is supplied to the cutting portion from the cutting oil supply hole that opens at the tool tip through the communication hole of the tool holder, Eliminate chips from the cutting section and cool the tool.

(Embodiment) The first embodiment of the cutting oil supply device of the present invention will be described below.
The drawings and FIG. 2 will be described. FIG. 1 is a sectional view showing an essential part of the present embodiment, in which a spindle 4 is provided on a machine tool body 1 by a bearing pressing lid 5 via an adjusting spacer 5a and a bearing 3,2. It is rotatably supported by 3. A gear 4a is attached to the spindle 4 by a nut 4b via a spacer 4c, and the spindle 4 is rotationally driven by rotating the gear 4a by a driving device (not shown).

A cylindrical concave portion 4d is formed at the tip of the spindle 4, and a cylindrical convex portion 6a protruding from the tool holder 6 is fitted into the concave portion 4d, and the tool holder 6 is fixed by a bolt 6b. is there. A cylindrical tool insertion hole 6c is provided at the tip of the tool holder 6, a tool 7 (a boring tool in this embodiment) is fitted therein, and the tool 7 is held by the tool holding screws 7a, 7a. It is detachably attached to.

The bearing retainer lid 5 has a cylindrical shape having a reduced diameter portion 5f at its tip, and the bearing retainer lid 5 includes the bearing retainer lid 5
A cutting oil introduction hole 5c is formed from the outer circumference 5i to the inner circumference 5b of the reduced diameter portion 5f. A hose 8 leading to a cutting oil tank (not shown) is connected to the outer periphery 5i side of the cutting oil introduction hole 5c so that the cutting oil is supplied. Inner circumference of cutting oil introduction hole 5c
5b side is an annular groove 5d formed on the inner circumference 5b of the bearing retainer lid 5.
Connected to. The reduced diameter part 5f of the bearing retainer lid 5
Labyrinth seals 5e, 5e are formed on the inner circumference 5b of the tool holder, that is, at the contact portion with the outer circumferential surface of the tool holder 6 with an annular groove 5d therebetween.

As shown in FIG. 2, which is a sectional view taken along the line AA in FIG. 1, a portion of the annular groove 5d is an outer peripheral portion of the tool holder 6 and is located at a position facing the annular groove 5d in the circumferential direction. And, the tool 7
There is a guide groove 6d whose depth gradually increases as it moves in the direction opposite to the cutting rotation direction (arrow B direction).
The deepest bottom surface portion of the guide groove 6d and the annular groove 6e formed along the inner surface of the tool insertion hole 6c of the tool holder 6 are communicated with each other through a communication hole 6f.
The cutting hydraulic pressure feeding means 12 is constituted by communicating with each other. The annular groove 6e is a cutting oil supply hole 7b opened at the tip of the tool 7.
Is in communication with.

Inner surface of large diameter portion 5h extending from end 5g of reduced diameter portion 5f of bearing pressing lid 5 to bearing 2 behind the contact portion between the inner peripheral surface of bearing pressing lid 5 and the outer peripheral surface of tool holder 6, spindle 4 and tool The outer peripheral surface of the holder 6 forms an annular space 9. An oil seal 9a is fitted to the end of the annular space 9 on the bearing 2 side to protect the bearing 2, and the annular space 9 is further divided into a circular cutting oil reservoir 9c and an air reservoir 9d by a partition 9b. It is partitioned. The partition 9b and the spindle 4 are formed with a communication portion 9e which communicates the cutting oil reservoir 9c and the air reservoir 9d with a gap therebetween, and the cutting oil reservoir 9c has a drain hole.
The air supply portion 9d communicates with the outside through an air supply portion 9d and an air supply hose 9h connected with an air supply source (not shown) through an air supply hole 9g.

In the operation of the present embodiment configured as described above, the gear 4a provided on the spindle 4 is rotationally driven by a driving device (not shown), and the tool holder 6 moves the tool 7 to the tool 7 via the spindle 4.
In the cutting rotation direction (arrow B direction). Along with the rotation of the tool holder 6, the guide groove 6d which is the cutting hydraulic pressure feeding means 12 also rotates in the direction of the arrow B, and the annular groove formed in the bearing pressing lid 5 is formed.
The cutting oil supplied from the cutting oil introduction hole 5c to 5d is pressure-fed to the cutting oil supply hole 7b formed in the tool 7 through the communication hole 6f, flows out from the tip of the tool 7, and cuts chips in the cutting part. It is removed from the hole and the tool 7 is cooled.

The labyrinth seals 5e and 5e formed on the inner circumference 5b of the reduced diameter portion 5f of the bearing pressing lid 5 with the annular groove 5d formed between them allow the cutting oil supplied from the cutting oil introducing hole 5c to the annular groove 5d to be absorbed by the bearing pressing lid. It is prevented from flowing out from the gap between the inner circumference 5b and the outer circumference of the tool holder 6. The cutting oil leaking from the gap between the inner circumference 5b of the bearing pressing lid 5 and the outer circumference of the tool holder 6 toward the tip of the tool 7 falls outside together with other cutting oil. On the other hand, the cutting oil leaking from the gap between the inner circumference 5b and the outer peripheral surface of the tool holder 6 to the cutting oil reservoir 9c, which is the direction opposite to the tool tip direction, is discharged to the outside through the drain hole 9f. Furthermore, the air pressure-fed to the air reservoir 9d through the air supply hole 9g from the communicating portion 9e formed at the end of the partition 9b, which is the partition of the cutting oil reservoir 9c on the bearing 2 side, on the spindle 4 side is transferred to the outer periphery of the spindle 4. By jetting the oil toward the cutting oil reservoir 9c along it, the cutting oil is prevented from leaking from the cutting oil reservoir 9c to the air reservoir 9d. Therefore, the cutting oil is prevented from leaking to the oil sheet 9a side, the adhesion to the oil seal 9a is prevented, and the bearing 2 is protected from intrusion of cutting oil.

FIG. 3 shows another embodiment of the present invention, in which the same parts as those of the embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals as those of FIGS. Although omitted, the end portion of the reduced diameter portion 5f of the bearing retainer lid 5 behind the contact portion between the inner peripheral surface of the bearing retainer lid 5 and the outer peripheral surface of the tool holder 6.
An annular space 10 is formed by the inner surface of the large diameter portion 5j extending from 5g to the bearing and the outer peripheral surface of the spindle 4 and the tool holder 6. An oil seal 10a is fitted to the end of the annular space 10 on the bearing 2 side to protect the bearing 2, and the annular space 10 is inserted through the spindle 4 into the inner surface of the large diameter portion 5j of the bearing retainer lid 5. The partition 10b having a hole divides the cutting oil reservoir 10c and the oil seal 10a into an accommodating portion and is provided so that the inner circumference has a gap with the outer circumference of the spindle 4.
On the other hand, a V ring 10d fitted to the outer periphery of the spindle 4 is provided in the cutting oil reservoir 10c, and the lip portion of the V ring 10d is a partition.
By making contact with the side surface of 10b and maintaining airtightness, the cutting oil in the cutting oil sump portion 10c is protected by the oil seal 10a.
The leakage of the cutting oil is prevented, and the cutting oil leaking into the cutting oil reservoir 10c from the gap between the inner circumference 5b of the bearing pressing lid 5 and the outer peripheral surface of the tool holder 6 is discharged to the outside through the drain hole 9f. Therefore, the oil seal 10a and the bearing 2 are protected from the cutting oil.

FIG. 4 shows still another embodiment of the present invention,
Although detailed description is omitted by giving the same reference numerals to the same parts as those in the embodiment shown in FIG. 3, the bearing presser lid 5 communicates with the cutting oil introduction hole 5c formed in the inner circumference 5b of the reduced diameter portion 5f. The annular recessed grooves 5k, 5k are formed on both sides of the annular groove 5d thus provided. By providing an annular seal 11 in which the lip portion 11a is in sliding contact with the outer periphery of the tool holder 6 in the groove grooves 5k, 5k, the gap between the bearing pressing lid 5 and the tool holder 6 is sealed, and the labyrinth seal of the above embodiment is abolished. By the spindle 4
When the rotation of the is relatively low and heat generation and wear are small, it can be manufactured at low cost.

In the above description, the spindle 4 and the tool holder 6 are separate parts, and the concave portions 4d and the convex portions 6a are fitted to each other and the bolt 4
Although they are integrally combined by 6b, the spindle 4 and the tool holder 6 can be integrally formed.

(Effect) By using the cutting hydraulic pressure feeding means in cooperation with the bearing pressing lid and the tool holder, the distance from the bearing that rotatably supports the spindle to the tool tip can be made small and the spindle and the tool holder during operation can be reduced. The rigidity of the bearing can be eliminated to improve the machining accuracy, and the sealing performance between the bearing retainer lid and the tool holder can be improved to eliminate the intrusion of cutting oil into the oil seal and bearing, and the durability of the oil seal and bearing. Can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of a cutting oil supply device of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG.
FIG. 4 is a sectional view showing the main part of another embodiment of the present invention, and FIG. 4 is a sectional view showing the main part of another embodiment of the present invention. 1 ... Machine tool main body, 2 ... Bearing, 4 ... Spindle,
5 ... Bearing pressing lid, 5c ... Cutting oil introduction hole, 5d ... Annular groove, 5e ... Labyrinth seal, 5k ... Groove groove, 6 ... Tool holder, 6d ... Guide groove, 6e ... Annular groove, 6f ... Communication hole, 7 …tool,
7b ... Cutting oil supply hole, 9 ... Annular space, 9a ... Oil seal, 9b ... Partition, 9c ... Cutting oil reservoir, 9d ... Air reservoir, 9e ...
Communication part, 9f ... Drain hole, 10 ... Annular space part, 10a ... Oil seal, 10b ... Partition, 10d ... V ring, 10c ... Cutting oil reservoir part, 11 ... Annular seal, 12 ... Cutting hydraulic pressure feeding means.

Claims (6)

[Scope of utility model registration request] 1. Cutting for supplying cutting oil from the outer peripheral portion of the tool holder to the cutting oil supply hole of a tool which is attached to a spindle of a machine tool via a tool holder and has a cutting oil supply hole opened at the tip of the tool. In the oil supply device, at the bearing end of the spindle, a bearing retainer lid is provided, a portion of the inner peripheral surface of which is in contact with the outer peripheral surface of the tool holder, and the bearing retainer lid extends from the outer periphery to the inner peripheral direction. A cutting oil introduction hole communicating with an annular groove formed on the inner periphery of the tool holder, and the tool holder is formed on the outer peripheral surface of the tool holder so as to face the annular groove and is opposite to the cutting rotation direction of the tool in the circumferential direction. Cutting oil, which has a guide groove that gradually becomes deeper as it moves in the direction, and a communication hole that opens at the deeper bottom of the guide groove and communicates with the cutting oil supply hole of the tool. Supply device 2. The cutting oil supply device according to claim 1, wherein a labyrinth seal is provided at the contact portion between the inner peripheral surface of the bearing retainer lid and the outer peripheral surface of the tool holder with an annular groove provided in the bearing retainer lid interposed therebetween. 3. The cutting oil supply apparatus according to claim 1, wherein an annular seal is provided at a contact portion between an inner peripheral surface of the bearing retainer lid and an outer peripheral surface of the tool holder with an annular groove provided in the bearing retainer lid interposed therebetween. 4. An annular space for surrounding the tool holder is provided on the inner peripheral surface of the bearing pressing lid at the rear of the contact portion between the inner peripheral surface of the bearing pressing lid and the outer peripheral surface of the tool holder, and the annular ring is formed on the bearing pressing lid. The cutting oil supply device according to any one of claims 1 to 3, wherein a drain hole that communicates the space and the outside air is formed. 5. The annular space is partitioned by a partition having a communication part between the spindle and the spindle to form a cutting oil reservoir having a drain hole and an air reservoir communicating with the air supply hole, and the spindle surface is provided. The cutting oil supply device according to claim 4, wherein air is circulated from the air reservoir to the cutting oil reservoir. 6. An annular space is divided by a partition having a spindle insertion hole to form a cutting oil reservoir having a drain hole and an oil seal housing, and a lip portion slidably contacting the partition on the outer peripheral surface of the spindle. The cutting oil supply device according to claim 4, wherein the formed annular seal is provided.