JP3060856U - Multi-axis spindle head for machine tools - Google Patents

Abstract

(57) [Summary] Even if a deep part of a workpiece w can be cut, lubrication of a required part can be easily performed. SOLUTION: A spindle shaft 1 having a cutting tool 17 at a tip end.
In a multi-axis spindle head in which a plurality of 0s are arranged in the same direction, a mist-like lubricating oil generating means 33 is provided. Each of the lubrication-required portions 14, 15, b, which is ejected from the tip of each cutting tool 17 through the cutting fluid supply pipe 19 provided in a rotating state and is present in the shielding spaces S1, s2 of the head frames 4, 5a, 5b, and 26.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a multi-axis spindle head of a machine tool in which atomized lubricating oil is jetted from a tip end of a cutting tool.

[0002]

[Prior art]

 In machining with a machine tool, a large amount of cutting oil is supplied to the machined part to cool and lubricate the workpiece and cutting tools, or to remove chips, but this may cause environmental pollution and human health due to the cutting oil. In addition to problems such as adverse effects of cutting oil, large costs associated with the disposal of cutting oil waste oil, shortening of the tool life due to excessive cooling of the workpiece, and excessive wear of the cutting tool due to sliding wear during fine cutting of the cutting tool. Since a large amount of cutting oil adheres to the chips, it is necessary to separate the cutting oil from the chips when processing and reusing the chips.

[0003] In order to solve these problems, in recent years, a very small amount of cutting oil has been supplied in the form of mist to the cutting section, and such processing is called dry cutting or the like. I have.

By the way, in a multi-axis spindle head of a machine tool, when cutting a relatively deep portion of a workpiece, the tip of the cutting tool can be effectively lubricated so that each cutting tool can be effectively lubricated. There is one that sprays mist-like cutting oil from the tip. In this type of multi-axis spindle head, parts requiring lubrication, such as bearings and gears, provided inside the head casing are generally lubricated with liquid lubricating oil different from cutting oil.

[0005]

[Problems to be solved by the invention]

 In the conventional multi-axis spindle head described above, it is necessary to provide two types of lubrication means, that is, lubrication of the tip of the cutting tool with cutting oil and lubrication of the bearings and gears with lubrication oil, and the structure and maintenance for lubrication are complicated. In addition, liquid lubricating oil generates a lot of frictional heat during the rotation of the spindle shaft and causes a reduction in machining accuracy, which limits the speed of rotation of the spindle shaft. An object of the present invention is to provide a multi-axis spindle head of a machine tool capable of coping with such a situation.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a multi-shaft spindle head in which a plurality of spindle shafts each having a cutting tool at the tip are disposed in the same direction, and a means for generating atomized lubricating oil is provided. The mist of lubricating oil generated in the above is ejected from the tip of each cutting tool through the cutting fluid supply pipe provided in the non-rotating state at the center of rotation of each spindle shaft, and each lubrication existing in the shielding space of the head frame It is configured to be supplied to the required places.

[0007] According to this, the mist-like lubricating oil lubricates not only the tip end of the cutting tool which cuts a deep part of the workpiece, but also each lubrication required part in the shielding space. The atomized lubricating oil reduces the generation of frictional heat due to the rotation of the spindle and efficiently lubricates many lubricating points.

[0008] The above invention is further embodied as follows. That is, a means for generating mist lubricating oil is provided outside the head frame, and a pipeline for supplying the mist lubricating oil generated by the generating means to the shielding space of the head frame is formed. When the atomized lubricating oil supplied to the nozzle is ejected from the tip of each cutting tool through the cutting fluid supply pipe provided in the non-rotating state at the center of each spindle shaft rotation, the gears and bearings that exist in the shielded space It is configured to be supplied to each required lubrication point. According to this, the lubricating oil generating means and the pipeline exist outside the head frame, so that the handling and maintenance can be easily performed.

[0009] Further, a passage for flowing the mist lubricating oil in the shielded space is formed at an appropriate position of the head frame. As a result, the circulating flow of the mist-like lubricating oil and the flow of the mist-like lubricating oil flowing out of the head frame are promoted, and the lubricating parts such as gears and bearings existing in the shielding space are surely lubricated.

[0010]

[Embodiment of the invention]

 FIG. 1 is a side sectional view showing a main part of a machine tool having a multi-axis spindle head according to an embodiment of the present invention, FIG. 2 is a view showing an xx section of FIG. 1, and FIG. FIG.

In these figures, 1 is a bed, 2 is a movable table operably mounted in a front-rear direction f1, f2 via a guide track 1a on the upper surface of the bed 1, and 3 is a movable table 2 Is a multi-axis spindle head fixed on the upper surface of the head.

The multi-axis spindle head 3 is specifically configured as follows. That is, a main head frame 4 fixed to the movable base 2 is provided, and a spindle section 5 is formed on the front surface of the frame 4. The spindle section 5 has an intermediate head frame 5a and a front head frame 5b fixed to the front surface of the main head frame 4 by bolts.

The intermediate head frame 5 a has an upright wall 6 and a side wall 7, and the front head frame 5 b has an upright wall 8 and a spindle case 9. At this time, the upright wall portion 8 is bolted to the main head frame 4 and the intermediate head frame 5a, and a through hole 8a through which the spindle shaft 10 is inserted is formed at a specific position for each spindle shaft 10 as shown in FIG. ing. S1 and S2 are front and rear shielding spaces surrounded by these head frames 4, 5a and 5b, which are communicated with each other through a through hole 8a.

The spindle case 9 includes a rectangular outer wall 11 surrounding the plurality of spindle shafts 10, and an intermediate wall 12 located between the spindle shafts 10.

A circular through hole a corresponding to each spindle shaft 10 is formed in the front surface of the outer wall portion 11 as shown in FIG. 3, and the spindle shaft 10 is inserted through the front surface of each through hole a. The front end face cover 13 is fixed by bolts.

Each of the spindle shafts 10 includes a large-diameter front portion 10a and a small-diameter rear portion 10b, and includes a bearing 14 fitted in the through hole a and a bearing 15 fitted in the through hole 8a. It is rotatably supported at a fixed position on the head frame 5b. A straight hole b is formed at an axial position at the center of each spindle shaft 10, and a front portion b1 of the hole b has a large diameter. Reference numeral 16 denotes a cover member for covering the front surface of the front end face cover 13, which is fixed to the spindle shaft 10.

A tool holder 18 to which a cutting tool 17 is fixed is fitted and fixed to a front part b1 of the hole b. At this time, cutting oil through holes c1 and c2 are formed at respective axial positions at the center of the blade 17 and the center of the tool holder 18.

Inside the hole b of the spindle shaft 10, a straight cutting oil supply pipe 19 smaller than the diameter of the hole b is provided concentrically with the spindle shaft 10. The supply pipe 19 has a rear end located in a hole 6b provided in the upright wall section 6 of the rear case frame 5a, and is bolted to the upright wall section 6 via coupling members 20a and 20b, and has a front end. It is located in the cutting oil through hole c2 of the tool holder 18. At this time, a bearing 21 is provided between the front of the cutting oil supply pipe 19 and the hole b so that the cutting oil supply pipe 19 does not hinder the smooth rotation of the spindle 10.

Each spindle 10 is driven by a spindle drive motor 22 mounted on the main head frame 4, and is specifically configured as follows. That is, a driving shaft 23 coupled to an output shaft of the main shaft drive motor 22 is rotatably provided at a fixed position at a front portion of the spindle portion 5 and at intermediate head frames 5a and 5b. The gear 24 is formed. On the other hand, a driven gear 25 is fixed at the rear end of each spindle shaft 10, and the driven gear 25 and the driving gear 24 are linked and connected by a gear train including a plurality of intermediate gears 26. In this case, d is a bearing rotatably supporting the rotation center axes of the driving gear 24 and the intermediate gear 26.

In front of the multi-axis spindle head 3 configured as described above, there is provided a workpiece fixing table 27 which is arranged at a constant relative to the bed 1. At this time, the surrounding frame member 28 is fixed around the support surface 27a of the workpiece fixing base 27.

Reference numeral 29 denotes a cover device mounted on the front surface of the multi-axis spindle head 3 so as to be able to retreat upward around a pivot point 30 and extend and contract in the front and rear directions f1 and f2. The workpiece w and the front part of the multi-axis spindle head 3 are surrounded in a state of being opened only on the lower side.

Reference numeral 31 denotes a hopper-type guide path for guiding chips, which is disposed so as to cover the lower surface of the cover device 29. Reference numeral 32 denotes chips or the like dropped from the hopper-type guide path 31 to appropriate places. A guide surface device for performing

Reference numeral 33 denotes a device for generating mist lubricating oil for generating mist lubricating oil, which includes a compressed air supply pipe 34, a filter 35a, a pressure regulator 35b, an atomizer 35c, and a lubricating oil delivery pipe 36. It has. The lubricating oil delivery pipe 36 communicates with a through hole p1 on the wall surface of the main head frame 4 and a through hole p2 on the outer wall surface 12 of the front head frame 5b via a pipe line 37. Is provided with an electromagnetic valve 38 that is opened and closed in a timely manner.

Further, an appropriate gap is formed between the front end face cover 13 and the outer peripheral surface of the spindle shaft 10, and between the front end of the front end face cover 13 and the rear face of the cover member 16 located in front of the front end cover 13. Also, a suitable gap is formed, and a through hole p3 is formed in the upright wall 6 of the intermediate head cover 5a for communicating the space before and after this.

Next, a description will be given of an example of use of the product of this embodiment configured as described above and its operation. When fixing the workpiece w, the movable table 2 is moved backward from the position in FIG. 1 to f2. As a result, the front edge of the cover device 29 is separated from the surrounding frame member 28, and the entire length of the cover device 29 in the front-rear direction is maximized by the urging means (not shown). In this state, the cover device 29 is retracted upward from the state shown in FIG. 1 around the pivot point 30 to secure a wide work space, and the workpiece w is fixed to the support surface 27a of the workpiece fixing base 27. Let it.

Thereafter, the cover device 29 is returned to the original position, and the spindle drive motor 22 is operated. Thus, the rotation of the motor 22 is transmitted to the respective spindles 10 via the gears 24, 25, 26, and the respective spindles 10 are guided by the bearings 14, 15 to rotate.

Since each cutting oil supply pipe 19 is fixed to the upright wall portion 6, the cutting oil supply pipe 19 is kept in a non-rotating state even while the spindle shaft 10 is rotating. The bearing 21 reliably prevents the contact between the cutting oil supply pipe 19 and the spindle shaft 10.

On the other hand, the solenoid valve 38 is opened as required. As a result, the compressed air supplied from the compressed air supply pipe 34 flows into the atomized lubricating oil generating device 35c, and the atomizing device 35c generates the atomized lubricating oil by the atomizing principle.

The atomized lubricating oil is supplied to the shielding spaces s 1 and s 2 of the head frames 4, 5 a and 5 b through the pipe 35 and the through holes p 1 and p 2, and a part thereof is supplied to each cutting oil supply pipe 19. And flows inward toward the front f1. Since the cutting oil supply pipe 19 does not rotate, the atomized lubricating oil flowing in the cutting oil supply pipe 19 is not affected by the centrifugal force caused by the rotation of the spindle shaft 10 at all. Therefore, in the cutting oil supply pipe 19, the liquefaction phenomenon due to the centrifugal force does not occur, and the component separation phenomenon due to the difference in specific gravity between the components does not occur, so that the state of being uniformly distributed is maintained.

The atomized lubricating oil is then spouted from the front end of the cutting oil supply pipe 19, and spouted from the tip of the cutting tool 17 through the cutting oil through holes c1 and c2 of the tool holder 18 and the cutting tool 17 in a relatively uniform distribution state. It is done.

Of the lubricating oil supplied to the shielding spaces s 1 and s 2, the lubricating oil that has not flowed into the cutting oil supply pipe 19 is caused by the flow induction effect due to the rotation of the gears 24, 25 and 26 and the like. , S2, and circulates through a through hole p3 or the like serving as a passage, or flows out through gaps between the bearings 14 and 15 and gaps between the spindle shafts 10 and the front end cover 13 thereof. The circulating flow of the lubricating oil and the flow accompanying the outflow of the lubricating oil cause fine lubricating oil particles to adhere to the required lubricating points such as the gears 24, 25, 26 and the bearings 14, 15 without unevenness. Thereby, each lubricating required portion is lubricated without interruption by these lubricating oil particles.

Next, the moving table 2 is moved to the front f1 under such an operating state, and the front edge of the cover device 29 comes into pressure contact with the rear edge of the surrounding frame member 28 by this movement. The cover device 29 is shortened and deformed in accordance with the forward displacement of the movable base 2 against the elasticity of the urging means (not shown) while maintaining the pressed state.

When the forward movement of the movable base 2 reaches a certain size, the cutting tool 17 reaches the workpiece w and processes it. Even during this processing, the mist-like lubricating oil is jetted from the tip of the cutting tool 17, and even if the cutting tool 17 is in a state of processing a deep portion of the workpiece w, a required portion is effectively lubricated. . In addition, when the workpiece w which has been processed is removed from the workpiece fixing base 27, the procedure is the reverse of that when the workpiece w is attached.

[0034]

[Effect of the invention]

 According to the present invention configured as described above, since the mist-like lubricating oil lubricates each required lubricating point in the shielded space of the head frame in addition to the tip of the cutting tool, the work to be processed can be compared. The lubrication oil can be easily cut while cutting deep points, and the mist of lubricating oil reduces the generation of frictional heat due to the rotation of the spindle shaft. At the same time, the cutting speed can be increased by increasing the spindle rotation speed, and the lubricating means can be simplified by the flow of the lubricating oil by the air flow, and the maintenance can be simplified.

According to the second aspect, it is possible to easily handle and maintain the means for generating the mist-like lubricating oil and the pipeline.

According to the third aspect, since the circulating flow of the mist-like lubricating oil in the shielded space is promoted, each lubricating required portion such as a gear and a bearing existing in the shielded space is surely lubricated. Will be done.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a main part of a machine tool provided with a multi-axis spindle head according to an embodiment of the present invention.

FIG. 2 is a diagram showing an xx section of FIG. 1;

FIG. 3 is an enlarged sectional view of the spindle head.

[Explanation of symbols]

 4, 5a, 5b Head frame 10 Spindle shaft 14, 15, d Bearing (necessary lubrication) 17 Cutting tool 19 Cutting fluid supply pipe 24, 25, 26 Gear (necessary lubrication) 33 Means for generating atomized lubricating oil p3 passage s1 , S2 shielding space

[Procedure amendment]

[Submission date] March 19, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

Claims (3)

[Utility model registration claims] 1. A multi-axis spindle head in which a plurality of spindle shafts each having a cutting tool at its tip are arranged in the same direction.
A mist lubricating oil generating means is provided, and the mist lubricating oil generated by the generating means is jetted from the tip of each cutting tool through a cutting fluid supply pipe provided in a non-rotating state at each spindle shaft rotation center. A multi-axis spindle head for a machine tool, characterized in that the multi-axis spindle head is supplied to lubrication-required points existing in a shielded space of a head frame. 2. A multi-axis spindle head in which a plurality of spindle shafts each having a cutting tool at a tip are arranged in the same direction.
Providing means for generating mist lubricating oil outside the head frame and forming a conduit for supplying the mist lubricating oil generated by this generating means into the shielding space of the head frame,
The atomized lubricating oil supplied into the shielded space is spouted from the tip of each cutting tool through the cutting fluid supply pipe provided in a non-rotating state at the center of rotation of each spindle shaft, and the gears existing in the shielded space and A multi-axis spindle head for a machine tool, which is supplied to each lubrication required point such as a bearing. 3. A multi-axis spindle head for a machine tool according to claim 2, wherein a passage for circulating the mist-like lubricating oil in the shielding space is formed at an appropriate portion of the head frame.