JP2001062619A - Table type horizontal boring machine and boring bar support device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the vibration and eccentricity at the intermediate part of a boring bar by providing the support means of the boring bar newly and machine with higher accuracy, even a thin and long hole. SOLUTION: This table type horizontal boring machine is provided with a main spindle 6 for supporting one end of a boring bar B and rotating in a horizontal state, a work placing stand 3 provided feed-movably along the axial direction of the boring bar B and a boring bar support device 9, installed on this work placing stand 3, for supporting near the other end of the boring bar B turnably and slidably in the axial direction and for moving along the axial direction of the boring bar B along with the feed-movement of the work placing stand 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table type horizontal boring machine and a boring bar supporting device used for the same.

[0002]

2. Description of the Related Art As a machine tool for boring a workpiece, a table-type horizontal boring machine 1 as shown in FIG. 3 is generally known.

The table-type horizontal boring machine 1 includes a bed 2 installed on a floor, a work mounting table 3 mounted on the bed 2 for fixing a work A, and one end of the bed 2. A column 4, a spindle head 5 attached to the column 4, and a spindle 6 attached horizontally to the spindle head 5 and rotating. A boring tool b is attached to the spindle 6. By setting and rotating one end of a boring bar B (boring bar), boring is performed on the workpiece A on the workpiece mounting table 3.

[0004] The spindle head 5 is held movably up and down along the column 4 so that its axial center position can be adjusted in accordance with the position of the machining hole a.

The work mounting table 3 is composed of a saddle 31 and a table 32 mounted on the saddle 31. The saddle 31 is held so that the saddle 31 can be fed and moved horizontally along the axial direction of the boring bar B. Table 32
Is held so as to be able to move horizontally in a direction perpendicular to the axial direction of the boring bar B, and it is also possible to adjust its height and inclination and to rotate it horizontally.

When the machining hole a of the workpiece A is short, the machining is performed while the spindle 6 is gradually extended, but the spindle 6 is cantilevered and can be held accurately with a limit of about 30 cm. Therefore, when the machining hole a is long, the boring bar support 8 is attached to the outer support 7 erected at the other end of the bed 2 so as to be opposed to the position of the main shaft 6, and the boring bar having the machining hole a inserted therethrough. Processing is performed with the other end of B supported by the boring bar support 8. By supporting both ends of the boring bar B in this manner, the vibration (chatter) and the eccentricity of the boring bar B at the time of machining can be made smaller than in the case of cantilever, and a long machining hole a can be machined. I have.

[0007]

However, in the conventional table type horizontal boring machine 1 described above, since the distance from the column 4 to the outer support 7 is long, the boring bar B is required.
Even if both ends are supported by the main shaft 6 and the boring bar support 8, a slight vibration or eccentricity occurs at the intermediate portion, and it is inevitable that the machining accuracy is reduced. If it occurs, satisfactory processing cannot be performed. In order to reduce the degree of the vibration and the eccentricity, it is necessary to secure the rigidity of the boring bar B itself by setting the thickness of the boring bar B to a certain value or more. Therefore, there is an inconvenience that the waste in designing the work and the work A is increased.

Accordingly, the present invention reduces vibration and eccentricity in the middle portion of the boring bar B by newly providing a means for supporting the boring bar B, and achieves higher accuracy even in a thin and long machining hole. It is an object of the present invention to provide a table-type horizontal boring machine that can be machined by using.

A table type horizontal boring machine of this type may be used also as a horizontal milling machine by setting a work bar on which a milling blade is mounted in place of the boring bar B on the main shaft 6. Also in this case, the means for supporting the work bar and the means for fixing and feeding the workpiece A are common, and also have the problem of reducing vibration and eccentricity during rotation of the work bar. Therefore, the table type horizontal boring machine in the present specification includes such a type of machine tool (a so-called table type horizontal boring milling machine).

In addition, another object of the present invention is to provide a boring bar supporting device constituting the boring bar supporting means.

[0011]

To solve the above-mentioned problems, a table-type horizontal boring machine according to the present invention comprises: a main shaft which supports one end of a boring bar and rotates in a horizontal state; A work table provided movably along the axial direction, and supported near the other end of the boring bar mounted on the work table so as to be rotatable and slidable in the axial direction, A boring bar support device that moves along the axial direction of the boring bar along with the feed movement of the workpiece mounting table,
It is characterized by having.

According to the present invention, one end of the boring bar can be supported by the main shaft, and the other end can be supported by the boring bar support device on the work mounting table. In performing the machining, when the work placing table is fed and moved in the axial direction of the boring bar, the boring bar supporting device also moves and the supporting position of the boring bar continuously changes. for that reason,
The other end of the boring bar is always supported at a position close to the workpiece, and the distance between the supporting points of the boring bar can be made shorter than before. Thus, even when the diameter of the boring bar is reduced, the vibration and eccentricity at the intermediate portion can be reduced, and the processing accuracy can be improved.

[0013] The boring bar support device includes a fixed part mounted on the work table, an elevating part mounted to be able to move up and down with respect to the fixed part, a grip part mounted to the elevating part, A slide bearing gripped by a grip portion, wherein the slide bearing rotatably and axially slidably supports a boring bar inserted inside the slide bearing.

According to the present invention, the boring bar is securely held, and its smooth rotation and sliding are ensured. Also,
It is also easy to match the axis of the plain bearing with the axis of the main shaft. Further, by making the fixing portion of the boring bar supporting device detachable on the work table, the boring bar supporting device can be removed as necessary.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. Parts and parts having the same functions and functions as those of the conventional table-type horizontal boring machine 1 have the same names and symbols as those used in the description of the conventional technology.

As shown in FIG. 1, a table type horizontal boring machine 10 of the present invention comprises a bed 2 installed on a floor,
A work table 3 mounted on the bed 2 for fixing the work A, a column 4 erected at one end of the bed 2, a spindle head 5 attached to the column 4, and a spindle head 5 A main shaft 6 which is mounted horizontally and rotates, and a boring bar support device 9 which is mounted on the work table 3
And. Then, one end of the boring bar B to which the boring tool b is attached is set on the main shaft 6, and the other end of the boring bar B inserted through the machining hole a of the workpiece A is near the boring bar support device 9. It has become supported.

The work table 3 is composed of a saddle 31 and a table 32 mounted on the saddle 31. The saddle 31 is held so as to be able to be fed horizontally in the axial direction of the boring bar B. Table 32
Is held so as to be able to move in a horizontal direction perpendicular to the axis of the boring bar B, and can be adjusted in height and tilt and rotated in the horizontal direction.

The spindle head 5 is held so as to be vertically movable along the column 4, and the axial position of the spindle 6 is adjusted according to the position of the machining hole a.

As shown in FIG. 2, the boring bar support device 9 is formed on a fixed portion 91 fixed to a predetermined position on the table 32 (FIG. 1) with bolts or the like, and formed on one side surface of the fixed portion 91. An elevating unit 92 attached to the elevating unit 92 so as to be able to ascend and descend along the guide groove,
It comprises a cylindrical sliding bearing 94 fitted into the grip 93. The height of the elevating part 92 is adjusted so that the axis of the slide bearing 94 coincides with the axis of the main shaft 6, and is fixed to the fixing part 91 by bolts or the like. The grip 93
The sliding bearing 94 is bisected into a semi-cylindrical shape so that it can be gripped from above and below, and they are fastened with bolts or the like. The slide bearing 94 is a metal bush formed of a metal, etc., and is capable of rotating a boring bar B inserted thereinto,
And it is slidably supported along the axial direction.

The boring bar support device 9 is fixed on the table 32 of the work mounting table 3, and one end of the boring bar B inserted into the work hole a of the work A is supported by the main shaft 6. The other end is supported by the slide bearing 94 of the boring bar support device 9. Since the boring bar support device 9 is fixed on the table 32, when boring the workpiece A, the saddle 3
When the table 1 and the table 32 are fed and moved in the axial direction of the boring bar B, the boring bar support device 9 moves with it,
The support position of the boring bar B changes continuously. for that reason,
The boring bar B whose one end is supported by the main shaft 6 is always supported at a position where the other end side is close to the workpiece A.

According to the present invention, the distance between the support points of the boring bar B can be made shorter than before, so that even when the diameter of the boring bar B is reduced, vibration and eccentricity at the intermediate portion thereof can be reduced. Can be smaller. As a result, even a thin and long machining hole a can be machined with higher accuracy.

In order to further stabilize the rotational movement of the boring bar B, the boring bar B is supported at two points, ie, the main shaft 6 and the boring bar supporting device 9, and furthermore, the bed 2
The other end of the boring bar B may be supported by a boring bar support 8 attached to the outer support 7 at the other end of the boring bar B.

When the table-type horizontal boring machine 10 is also used as a horizontal milling machine, the work bar of the milling blade set in place of the boring bar B is similarly supported by the boring bar support device 9. do it.

By making the boring bar support device 9 detachable from the table 32, the boring bar support device 9 can be detached when the machining hole a to be machined in the workpiece A is short or obstructs other machining operations. . The table-type horizontal boring machine 10 from which the boring bar support device 9 has been removed can be used in the same manner as in the related art.

In the present invention, the structure of the work table 3 is not limited to the above-described embodiment, and the work A
The table 32 or a fixing means similar to the table 32 for mounting and fixing the sheet B need only be able to be fed and moved at least along the axial direction of the boring bar B.

The structure of the column 4 and the spindle head 5, the means for adjusting the axial center position of the spindle 6, and one end of the boring bar B are connected to the spindle 6
There is no particular limitation on the mechanism for setting the
It shall be based on any known technique.

[0027]

By using the table-type horizontal boring machine of the present invention, one end of the boring bar is supported by the main shaft, and the other end is supported by the boring bar supporting device on the work table. This can reduce the distance between the support points of the boring bar.
As a result, the vibration and eccentricity of the boring bar during machining are reduced, so that even small and long machined holes can be machined with higher accuracy.

Further, according to the boring bar support device of the present invention, the boring bar is securely held, and smooth rotation and sliding thereof are ensured. Further, it is easy to make the axis of the slide bearing coincide with the axis of the main shaft. By making the fixing portion of the boring bar supporting device detachable on the work table, the boring bar supporting device can be removed as necessary.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of a table type horizontal boring machine of the present invention.

FIG. 2 is a perspective view showing a configuration of a boring bar support device in the table type horizontal boring machine.

FIG. 3 is an overall configuration diagram showing a conventional table-type horizontal boring machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Table-type horizontal boring machine 3 Workpiece mounting table 6 Main shaft 9 Boring rod support device 91 Fixed part 92 Elevating part 93 Gripping part 94 Sliding bearing B Boring rod

Claims (3)

[Claims] 1. A spindle for supporting one end of a boring bar and rotating the boring bar in a horizontal state, a workpiece mounting table provided so as to be able to feed at least along the axial direction of the boring bar, and A boring that is mounted on a mounting table and rotatably and axially slidably supports the vicinity of the other end of the boring bar, and moves along the axial direction of the boring bar along with the feed movement of the workpiece mounting table. A table-type horizontal boring machine, comprising: a bar supporting device. 2. A boring bar supporting device, comprising: a fixed part mounted on a work table, a lifting part mounted to be able to move up and down with respect to the fixed part, a holding part mounted to the lifting part, and a holding part. And a slide bearing gripped by a portion, the slide bearing rotatably and axially slidably supporting a boring bar inserted inside the slide bearing. Table type horizontal boring machine. 3. A fixed part detachably mounted on the work table, a lifting part mounted on the fixed part so as to be movable up and down, a holding part mounted on the lifting part, and a holding part. A boring rod support device, comprising: a sliding bearing, wherein the sliding bearing rotatably and axially slidably supports a boring rod inserted therein.