JP2003175438A - Jig cooling structure for processing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a jig cooling structure for a processing machine, capable of significantly restraining a temperature rise during processing. <P>SOLUTION: A cooling fin section 24 for increasing a surface area is provided on inner walls 14b, 15b formed with cooling passages 14a, 14b, thus improving cooling efficiency by flowing cooling air. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a jig for a processing machine, in which a cooling flow path for circulating cooling air is formed.

[0002]

2. Description of the Related Art As a technique related to a cooling structure for a jig for a processing machine having a cooling flow passage formed therein for circulating cooling air, for example, there is one disclosed in Japanese Patent Laid-Open No. 2001-47311. In this publication, when a dry cutting method is adopted in which cutting is performed without using cutting oil, the influence of thermal strain generated on the machining axis becomes large. There is described a hobbing machine that suppresses thermal strain and secures processing accuracy by forming a cooling flow path through which air flows.

[0003]

However, in the case of adopting the dry cut method in which cutting is performed without using cutting oil, cooling channels are formed by forming cooling channels inside the machining shaft as described in the above publication. Even if the air was circulated, there were cases where it could not be sufficiently cooled. In particular, when performing stacking processing in which multiple workpieces are stacked at once in order to improve processing efficiency in gear cutting of spur gears, the temperature of the workpieces and jigs that support the workpieces will naturally increase during processing. However, the cooling structure of the above publication cannot sufficiently suppress the temperature rise.

Therefore, an object of the present invention is to provide a cooling structure for a jig for a processing machine capable of sufficiently suppressing a temperature rise during processing.

[0005]

In order to achieve the above object, the cooling structure for a jig for a processing machine according to claim 1 of the present invention has a cooling flow path (for example, an embodiment) through which cooling air is circulated. Cooling flow passages 14a, 15a) in which the cooling fin portions (for example, the inner walls 14b, 15b in the embodiment) for increasing the surface area are formed on the inner walls (for example, the inner walls 14b, 15b in the embodiment) that form the cooling flow passages. The cooling fin portion 24) in the embodiment is provided.

As described above, since the inner wall forming the cooling passage is provided with the cooling fin portion for enlarging the surface area, the cooling efficiency by the circulating cooling air can be improved.

A cooling structure for a jig for a processing machine according to a second aspect of the present invention is the cooling structure according to the first aspect, wherein the cooling fin portion is formed by a plurality of annular members press-fitted into the inner wall (for example, the embodiment). It is characterized by comprising an annular member 25).

As described above, since the cooling fin portion is composed of a plurality of annular members press-fitted into the inner wall, it is only necessary to separately manufacture and press-fit a plurality of annular members, especially in the case where a large cross-sectional area of the cooling passage can be obtained. This facilitates manufacturing when forming a large cooling fin portion.

A cooling structure for a jig for a processing machine according to a third aspect of the present invention is the cooling structure according to the second aspect, wherein the annular member has a partially cut and obliquely bent inclined portion ( For example, it has an inclined portion 31) in the embodiment, and is characterized in that the plurality of annular members are arranged such that the inclined portions thereof form a spiral shape.

As described above, since the plurality of annular members respectively have the inclined portions that are partially cut and bent obliquely, and the inclined portions are arranged so as to form a spiral shape. The cooling air guided by the inclined portion flows spirally, and the cooling efficiency by this air can be further improved.

According to a fourth aspect of the present invention, there is provided a cooling structure for a jig for a processing machine, which is characterized in that the annular member is made of aluminum.

As described above, since the annular member is made of aluminum having a high thermal conductivity, the cooling efficiency of the circulating cooling air can be further improved.

A cooling structure for a jig for a processing machine according to a fifth aspect of the present invention is the cooling structure according to the first aspect, wherein the cooling fin portion has a thread formed on the inner wall (for example, a screw thread in the embodiment). It is characterized by consisting of mountains 34).

As described above, since the cooling fin portion is composed of the threads formed on the inner wall of the cooling flow passage, the cooling fin can be easily cooled even if the cross-sectional area of the cooling flow passage cannot be made large. Parts can be formed.

A cooling structure for a jig for a processing machine according to claim 6 of the present invention is the cooling structure according to claim 1, wherein the cooling fin portion is a honeycomb core press-fitted into the inner wall (for example, the honeycomb in the embodiment). It is characterized by comprising a core 37).

As described above, since the cooling fin portion is composed of the honeycomb core press-fitted into the inner wall of the cooling channel, the cooling fin portion can be easily formed.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A cooling structure for a jig for a processing machine according to a first embodiment of the present invention will be described below with reference to FIGS.

The jig for the processing machine of the first embodiment is a dry cutting method for cutting without using cutting oil, and in addition, in order to improve the processing efficiency, the works are stacked in a plurality of stages at a time. For gear cutting machines (hobbing machines) that perform stacking for gear cutting. Specifically, as shown in FIG. 1, a plurality of annular workpieces 11 are stacked and the inner peripheral side of the workpieces is fitted. The machining shaft 12 is supported while being centered.

The machining shaft 12 is grasped with its lower end inserted into the supporting base 13 of the gear cutting machine from above, and the machining shaft body 14 for fitting the workpiece 11 to the intermediate portion in the axial direction, It has an upper connecting member 15 attached to the upper side of the processing shaft body 14, and an air introducing member 16 is attached to the upper side of the upper connecting member 15.

An air passage 16a for introducing cooling air is formed in the air introducing member 16, and the air passage 16a is formed in the upper connecting member 15 (specifically, in the center). Air flow path 1 through which air introduced through 16a flows
5a is formed. Furthermore, the processing shaft body 14
An air flow path 14a is formed inside (specifically, in the center) of the air flow path 15a for flowing the air introduced therein. In addition, the support base 13 is also formed with an air flow path 13a for flowing the air introduced through the air flow path 14a.

The machining shaft 12 includes an inner sleeve 18 arranged outside the upper part of the machining shaft main body 14, and an inner sleeve 1 of the inner sleeve 18.
8 has an outer sleeve 19 disposed on the outer side of the outer sleeve 8, and a pressing member 20 disposed on the outer side of the outer sleeve 19 for pressing the work 11 fitted to the machining shaft main body 14 from above. On the other hand, a support member 21 that supports the work 11 from below is attached to the upper side of the support base 13.

The processing shaft 12 has the processing shaft body 1
4 will be fitted with a plurality of works 11. In this state, the plurality of works 11 are supported by the support member 21 on the support base 13.
The lower side is supported by the pressing member 2 of the processing shaft 12
At 0, it will be pressed from above. In this state, the work is positioned in the axial direction and the radial direction. Then, in this state, gear cutting is performed by a hob cutter (not shown).

At this time, the temperature rise of the workpiece 11 due to the gear cutting and the machining shaft 1 caused by the temperature rise.
In order to prevent the temperature rise of 2, the cooling air is introduced from the air flow passage 16a of the air introduction member 16 to the air flow passage 15a of the upper connecting member 15 of the machining shaft 12 and the machining shaft main body 14 of the machining shaft 12. The heat transmitted to the upper connecting member 15 and the machining shaft main body 14 is taken by passing through the air flow path 14a, and is discharged through the air flow path 13a of the support base 13.

In the first embodiment, the inner wall 15b forming the cooling passage 15a of the upper connecting member 15 of the machining shaft 12 and the cooling passage 1 of the machining shaft body 14 of the machining shaft 12 are formed.
Cooling fin portions 24 for increasing the surface area are provided on the inner wall 14b forming 4a, respectively.

The cooling fin portion 24 has inner walls 14b, 1
It is composed of a plurality of cup-shaped annular members 25 press-fitted into 5b. As shown in FIGS. 2 and 3, the annular member 25 has a disc portion 27 having a hole portion 26 formed in the center thereof, and an outer peripheral edge of the disc portion 27 in a direction perpendicular to the disc portion 27. It is in the shape of an orifice having a bent cylindrical portion 28, and is manufactured by press molding from aluminum having a high thermal conductivity.

A plurality of such annular members 25, each having a cylindrical portion 28 on the upper side and a disc portion 27 on the cooling passages 14a,
The inner walls 14 of the cooling flow passages 14a, 15a are arranged so as to be orthogonal to the axial direction of the cooling flow passages 15a, and adjacent ones have a predetermined gap in the axial direction of the cooling flow passages 14a, 15a.
It is press-fitted and fixed to b and 15b. Since the cooling channels 14a and 15a have different inner diameters, the annular member 25 for the cooling channel 14a and the annular member 25 for the cooling channel 15a have different sizes, but the shapes are the same. is there.

According to the first embodiment described above, the inner wall 15b forming the cooling flow path 15a of the upper connecting member 15 of the processing shaft 12 and the cooling flow path 14a of the processing shaft body 14 of the processing shaft 12 are formed. Since the cooling fin portions 24 for increasing the surface area are provided on the inner wall 14b and the inner wall 14b, respectively, the cooling fin portions 24 are introduced from the air flow passage 16a of the air introduction member 16, and the machining shaft 1
Air passage 15a of the upper connecting member 15 of No. 2 and processing shaft 1
The upper connecting member 15 of the processing shaft 12 and the processing shaft main body 1 by passing through the air flow path 14a of the second processing shaft main body 14.
It is possible to improve the cooling efficiency by the cooling air that takes away the heat transferred to the motor 4. Therefore, the temperature rise of the workpiece 11 and the machining shaft 12 during machining can be sufficiently suppressed. That is, even in the case of the dry cutting method in which cutting is performed without using cutting oil, and the stacking processing in which a plurality of workpieces 11 are stacked and processed at one time is performed, the processing of the workpiece 11 and the processing shaft 12 is performed. The temperature rise inside can be suppressed sufficiently.

Further, the cooling fin portion 24 has the inner walls 14b, 1
Since it is composed of a plurality of annular members 25 press-fitted into 5b, the plurality of annular members 25 may be separately manufactured and press-fitted. Especially, in the case where a large cross-sectional area of the cooling flow paths 14a and 15a can be obtained, a large cooling fin portion is required. Manufacturing when forming 24 is facilitated.

Further, since the annular member 25 is made of aluminum having a high thermal conductivity, the cooling efficiency by the circulating cooling air can be further improved. Therefore, the temperature rise of the workpiece 11 and the machining shaft 12 during machining can be suppressed more sufficiently. The annular member 25
A material other than aluminum may be used as long as it has a high thermal conductivity.

Next, the cooling structure of the jig for a processing machine according to the second embodiment of the present invention will be described below with reference to FIGS. 4 and 5, focusing on the differences from the first embodiment. The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The second embodiment is different from the first embodiment in the shape of the annular member 25. That is, the annular member 25 of the second embodiment is made of aluminum having the disk portion 27 and the cylindrical portion 28, as in the first embodiment,
As shown in FIGS. 4 and 5, in a part of the disc portion 27, near the boundary between the rear disc portion 27 and the cylindrical portion 28 extending in the radial direction from the inner end toward the cylindrical portion 28. And cylindrical part 2
8 is cut by a cut 30 having a shape extending in an arc along 8 and is obliquely bent so as to project toward the opposite side with respect to the cylindrical portion 28 in the axial direction and the projection amount increases toward the tip side. It has a part 31.

Although not shown in the drawing, a plurality of such annular members 25 are sequentially arranged so that their inclined portions 31 have the same spiral shape, and their phases in the circumferential direction are sequentially shifted. That is, in the air flow passage 14a, the air flow passage 1
The inclined portions 31 of all the annular members 25 are arranged on the same virtual spiral centering on the axis of 4a, and even in the air flow path 15a, the same virtual centering on the axis of the air flow path 15a. The inclined portions 31 of all the annular members 25 are arranged on the spiral of.

According to the second embodiment described above, the plurality of annular members 25 each have the inclined portions 31 each of which is partially cut and bent at an angle, and the inclined portions 31 are adjacent to each other. Since it is arranged in a spiral shape, the cooling air guided by the inclined portion 31 flows in a spiral shape, and the cooling efficiency by this air can be further improved. Therefore, the temperature rise of the workpiece 11 and the machining shaft 12 during machining can be suppressed more sufficiently.

Next, a cooling structure for a jig for a processing machine according to a third embodiment of the present invention will be described below with reference to FIG. 6, focusing on the differences from the first embodiment. The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the third embodiment, the cooling fin portion 24 is not an annular member, but the inner wall 15b forming the air passage 15a of the upper connecting member 15 of the machining shaft 12 and the air passage of the machining shaft body 14 of the machining shaft 12. The inner wall 14b which forms 14a consists of the screw thread 34 formed in each.

According to the third embodiment as described above, the cooling fin portion 24 includes the inner walls 14b of the cooling passages 14a and 15a.
Since the thread 34 is formed on the cooling fin portion 15b, the cooling fin portion 24 can be easily formed even when the cooling passages 14a and 15a cannot have a large cross-sectional area.

Next, a cooling structure for a jig for a processing machine according to a fourth embodiment of the present invention will be described below with reference to FIGS. 7 and 8 focusing on the difference from the first embodiment. The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the fourth embodiment, the cooling fin portion 24 is not an annular member, but the inner wall 15b forming the air passage 15a of the upper connecting member 15 of the machining shaft 12 and the air passage of the machining shaft main body 14 of the machining shaft 12. The honeycomb cores 37 are press-fitted into the inner walls 14b forming 14a. Here, the honeycomb core 37 includes the air flow paths 14a, 15
so that the cross section orthogonal to the axial direction of a has a hexagonal shape,
In other words, the openings at both ends of the honeycomb are connected to the air flow path 14a,
It is press-fitted into the air flow paths 14a and 15a, respectively, in a posture in which they are arranged on both sides in the axial direction of 15a.

According to the fourth embodiment as described above, the cooling fin portion 24 includes the inner walls 14b of the cooling passages 14a and 15a.
Since the honeycomb cores 37 are press-fitted into the respective 15b, the cooling fin portions 24 can be easily formed.

In the above-described first to fourth embodiments, the air flow path 15a of the upper connecting member 15 of the processing shaft 12 is used.
Machining shaft body 1 of inner wall 15b and machining shaft 12 forming
The case where the cooling fin portion 24 having the same structure is provided on the inner wall 14b forming the air passage 14a of No. 4 has been described as an example.
The cooling fin portion 2 having a different structure by appropriately combining these
Of course, it is also possible to provide 4. Further, the inner wall 15 forming the air flow path 15a of the upper connecting member 15 of the processing shaft 12
The cooling fin portion 24 may be provided only on b, or the cooling fin portion 24 may be provided only on the inner wall 14b forming the air flow path 14a of the processing shaft body 14 of the processing shaft 12.

[0041]

As described in detail above, the first aspect of the present invention
According to the cooling structure for a jig for a processing machine described above, since the cooling fin portion for increasing the surface area is provided on the inner wall forming the cooling flow path, it is possible to improve the cooling efficiency by the circulating cooling air. You can Therefore, the temperature rise during processing can be sufficiently suppressed.

According to the cooling structure for a jig for a processing machine of claim 2 of the present invention, since the cooling fin portion is composed of a plurality of annular members press-fitted into the inner wall, the plurality of annular members are separately manufactured and press-fitted. In particular, when the cross-sectional area of the cooling channel can be made large and the large cooling fin portion is formed, the manufacturing becomes easy.

According to the cooling structure for a jig for a processing machine according to claim 3 of the present invention, a plurality of annular members each have an inclined portion in which a part thereof is cut and bent obliquely,
Since the inclined portions are arranged so as to form a spiral shape, the cooling air guided by the inclined portions flows in a spiral shape, and the cooling efficiency by the air can be further improved. Therefore, the temperature rise during processing can be suppressed more sufficiently.

According to the cooling structure for a jig for a processing machine according to claim 4 of the present invention, since the annular member is made of aluminum having a high thermal conductivity, the cooling efficiency by the circulating cooling air can be further improved. You can Therefore, the temperature rise during processing can be suppressed more sufficiently.

According to the cooling structure for a jig for a processing machine according to claim 5 of the present invention, since the cooling fin portion is composed of the screw thread formed on the inner wall of the cooling passage, the passage of the cooling passage is particularly preferable. Even if the cross-sectional area cannot be made large, the cooling fin portion can be easily formed.

According to the cooling structure for a jig for a processing machine of the sixth aspect of the present invention, since the cooling fin portion is formed of the honeycomb core press-fitted into the inner wall of the cooling flow passage, the cooling fin portion can be easily formed. can do.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a cooling structure of a jig for a processing machine according to a first embodiment of the present invention.

FIG. 2 is a front sectional view showing an annular member of a cooling structure for a jig for a processing machine according to the first embodiment of the present invention.

FIG. 3 is a plan view showing an annular member of a cooling structure for a jig for a processing machine according to the first embodiment of the present invention.

FIG. 4 is a front sectional view showing an annular member of a cooling structure for a jig for a processing machine according to a second embodiment of the present invention.

FIG. 5 is a plan view showing an annular member of a cooling structure for a jig for a processing machine according to a second embodiment of the present invention.

FIG. 6 is a front sectional view showing a cooling structure of a jig for a processing machine according to a third embodiment of the present invention.

FIG. 7 is a front sectional view showing a cooling structure of a jig for a processing machine according to a fourth embodiment of the present invention.

FIG. 8 is a plan sectional view showing a honeycomb core and the like of a cooling structure for a jig for a processing machine according to a fourth embodiment of the present invention.

[Explanation of symbols]

12 Processing axis (jigs for processing machines) 14a, 15a Cooling channel 14b, 15b inner wall 24 Cooling fin section 25 annular member 31 Inclined part 34 screw thread 37 Honeycomb core

Claims (6)

[Claims] 1. A cooling structure for a jig for a processing machine, wherein a cooling flow path for circulating cooling air is formed inside, and a cooling fin portion for enlarging a surface area is provided on an inner wall forming the cooling flow path. A cooling structure for a jig for a processing machine, which is provided. 2. The cooling fin portion includes a plurality of annular members press-fitted into the inner wall.
Cooling structure for the jig for the processing machine described. 3. The annular member has an inclined portion in which a part thereof is cut and bent obliquely, and the plurality of annular members are formed so that the inclined portions of each of the annular members are spiral. The cooling structure for a jig for a processing machine according to claim 2, wherein the cooling structure is arranged. 4. The cooling structure for a jig for a processing machine according to claim 2, wherein the annular member is made of aluminum. 5. The cooling structure for a jig for a processing machine according to claim 1, wherein the cooling fin portion includes a screw thread formed on the inner wall. 6. The cooling structure for a jig for a processing machine according to claim 1, wherein the cooling fin portion includes a honeycomb core press-fitted into the inner wall.