JPS597507A - Main spindle device of boring machine - Google Patents

Abstract

PURPOSE:To enable to bore holes with two and more kinds of diameter respectively in a boring machine by a structure wherein the main spindle device consists of an inside main spindle and an outside main spindle, both of which are eccentric to each other. CONSTITUTION:When a tip 11 is situated at the position opposite to the axis center O1 of the outside main spindle 2 (center of rotation) with respect to the axis center O2 of the inside main spindle 7, the diameter D of rotary locus of the tip 11 becomes the maximum cutting diameter D=2(r+delta), where (r) is the radius of locus of the tip 11 to the inside main spindle 7 and delta is the eccentricity between the inside main spindle 7 and the outside main spindle 2. When the tip 11 is situated at the position opposite to the axis center O2 of the inside main spindle 7 with respect to the axis center O1 of the outside main spindle 2, the diameter D' of rotatory locus of the tip 11 becomes the minimum cutting diameter D'=2(r-delta). Any change of cutting diameter is performed by revolving the main spindle 7 with respect to the main spindle 2 by said difference 4delta between the diameters D and D' or, in other words, by shifting racks 16 and 16 with respect to a screw gear 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a boring machine, and particularly to a main shaft device for a boring machine that is capable of boring nine holes of two or more diameters by changing the cutting diameter.

The main spindle devices of conventional boring machines of this type are shown in Figures 1 to 3.
As shown in the figure, the main spindle bV supported on the headstock α! It is connected to the main shaft motor d via the bell) c.

A boring bar ε is fixed coaxially to the end of the main shaft, and a chip cartridge I having a chip f fixed to the tip is attached to the side surface of the tip of the boring bar e. This chip cartridge! The proximal end is fixed to the boring bar, and the tip has an adjustable pole)
A is provided, and the tip of an adjustment pin i provided so as to be slidable in a direction perpendicular to the axis of the boring bar e is in contact with the end face of this adjustment bolt h. The base gAsVi of the adjustment bin i is inclined, and on this slope,
A slope provided at the tip of a four-bar knob is slidably provided on the shaft center of the boring bar e. The drill part passes through the axis of the main shaft, and its base end is connected to the drill fitting Ht via a rotary joint k. The stroke of this draw device Mt is made at the stopper m, and the stopper m
is designed to be lli#i by a correction step motor P controlled by a gauge controller 0.

In the above-mentioned conventional spindle device, when the draw device t is operated to pull the lever, the adjustment pin i that comes into contact with the slope at the tip of the lever moves outward in the direction perpendicular to the axis, and is moved through the adjustment pin A. Chip cartridge! is pushed up. As a result, the chip cartridge y is elastically deformed and bent outward, and the diameter of the rotation locus of the chip f is expanded to a predetermined dimension.

By rotating the spindle in this state, the hole of the predetermined diameter is bored.

After processing is completed, return the draw device. In this way, the 1 draw part ° also returns to its original state, the chip cartridge l returns with elasticity, and the diameter of the rotation locus of the chip f is reduced (retracted). In this state, if the spindle is returned using the feed mechanism, the chip can be returned without leaving a tool mark in the machined hole.

In addition, if dimension correction is required, measure the machined hole diameter with a gauge, input the difference from the target value to the controller O,
The correction step motor 71) is rotated by a predetermined amount and the position of the stopper m is adjusted via a precision screw.

By repeating the above procedure for each machining cycle, the amount of wear on the tip f is also corrected, and the machining diameter is always maintained at a dimension extremely close to the target value.

However, since the conventional device described above relies on the elastic deformation of the chip cartridge y, it is highly reliable against frequent repetition, but the chip cartridge! Because it cannot be used beyond the allowable elastic deformation of It is unsuitable for those who do.

The present invention was conceived in consideration of the above-mentioned problems, and in addition to correcting the cutting diameter by elastic deformation of the chip cartridge,
The cutting diameter can be changed significantly, and the setup for changing the cutting diameter can be done extremely easily without changing the boring bar or chip cartridge.
Moreover, the present invention aims to provide a main spindle device for a boring machine that can automate this setup change and also make the mechanism for this setup change durable and reliable. It is something.

Embodiments of the present invention will be described below with reference to FIG. 4 and subsequent figures.

In the figure, 1 is a spindle case, 2 is an outer main shaft supported by this spindle case 1, and this outer main shaft has two pulleys 3.
It is connected to the main shaft motor 6 via #4 and belt 5. Reference numeral 7 denotes an inner main shaft rotatably fitted and supported within the outer main shaft 2, and the axis of the inner main shaft 7 is offset by δ with respect to that of the outer main shaft 2. A boring bar 8 is fixed to the tip of this inner main shaft 7. This boring bar 8 has a structure similar to that of the conventional example shown in FIG. is fixed. Further, a draw bar 12 for driving the adjustment pin 9 upward is slidably incorporated therein. The drawbar 12 is a correction drawbar 1 fitted in the axial direction so as to be able to slide inside the inner main shaft 7 and rotate integrally with the pivot 13.
It is connected to the tip of 4. Note that both the drawers 12 and 14 are provided at positions concentric with the inner main shaft 2.

A screw gear 15 is provided on a part of the outer circumference of the inner main shaft 7 in the axial direction. A portion of the outer main shaft 2 facing this is cut out, and a rack 16.16 that is screwed onto the screw gear 15 is fixed to a rack holder 17 that fits around the outer periphery of the outer main shaft 2. It is provided. The ranks 16.degree. 16 are arranged on both sides of the axis of the inner main shaft 7. The tick holder 17 is slidable in the axial direction on the outer main shaft 2 and locked in the rotational direction by a key 18.

The outer peripheral part of the rack holder 17 is rotatably connected to the bracket 20 and is connected to a cylinder device 2I that engages and supports the rack holder 20 in the axial direction, and is movable in the axial direction of the main shaft. There is.

A base portion of the correction drawbar 14 protrudes from the base end of the inner main shaft 7, and a rotary joint 22 is connected to this portion. The rotary joint 22Fi has a joint member 24 that is concentric with the outer main shaft 2, is slidable in the axial direction with respect to the outer main shaft 2, and is locked in the rotational direction with a key 23, and the joint part 124 is The base end portion of the correction drawbar 14 is rotatably and axially locked and connected to the joint member 24. The connecting axis of the correction dollar bar 14 to the joint member 24 is eccentric in the same direction and by the same amount of eccentricity δ relative to the eccentric direction of the inner main shaft 7 with respect to the outer main shaft 2.

The connecting portion It25 of the rotary joint 22 is connected to the Drew device 26. This Dru device 26 has the same construction as the conventional example shown in FIG. 1, and the connecting member 25 is connected to a piston 28 fitted in a sill 27 via a rotary joint 25α.

The stopper 30 is constructed using a 29-piece precision screw and is a step motor for correction that rotates the stopper 29 by the required amount and moves it in the axial direction. On the other hand, 31 is a controller that controls this step motor 30, and a gauge that is inserted into the hole after machining 32 to measure it.
Data from No. 2 is input to the controller 31.

In the above configuration, the outer main shaft 2 is rotated by driving the main shaft motor 6. At this time, the inner spindle 7 rotates integrally with the outer spindle 2 due to the threaded engagement of the screw gear 15 and rack 16. A circle is drawn, and the inner diameter of the tip 11 is machined to the same diameter as the trajectory circle.

The correction of the inner working diameter is carried out by the drawing device 26 as in the conventional case. That is, by pulling the trappers 12 and 14 with the draw device 26, the tip cartridge 10 is deformed into an outward curve, expanding the trajectory circle diameter of the tip II, and conversely moving the draw bars 12 and 14 toward the tip. As a result, the chip cartridge 10 returns due to its elasticity, and the trajectory circle diameter of one chip 11 becomes smaller.

On the other hand, apart from the above operation, the cylinder equipment fi! By 2+,
When the bracket 20 is moved in the axial direction of the main shaft, the rack +
6.16, the inner main shaft 7 rotates with respect to the outer main shaft 2 via the screw gear I5, and the rotation locus diameter of the tip 11 changes as shown in FIGS. 6 and 7.

That is, as shown in FIG. 6, when the chip 11 is positioned on the opposite side of the fine (rotation center) Ol of the outer main shaft #12 with respect to the axis 0 of the inner main shaft 7, the rotation trajectory of one chip 11 is The diameter is the tip 11 relative to the axis 01 of the inner main shaft 7.
When the locus radius of is r, D=2Cr+δ), which is the maximum cutting diameter.

Further, as shown in FIG. 7, when the tip 11 is located on the opposite side from the enemy, D'=2(r-δ), which is the minimum cutting diameter.

The difference between the maximum and minimum cutting diameters is 4δ, and within this range, the cutting diameter can be changed as desired by rotating the inner main shaft 7 with respect to the outer main shaft 2. The change in cutting diameter is made by moving the rack 16.16 relative to the screw gear 15, and the movement of the rack 16.16 changes the stop of the cylinder device 21 using a stopper (not shown). This allows a predetermined stroke to be taken.

In the above operation, the dowel bar 12.14 is connected to the inner main shaft 7.
It is concentric with the outer main shaft, that is, not the same as the rotation axis, and the axis of the dowel device 26 is concentric with the outer main shaft 2, but during cutting, both the inner and outer shafts rotate simultaneously in the same direction. Since there is no phase difference between the two principal axes, the above does not pose a problem. Furthermore, when the cutting diameter is changed significantly, that is, during the setup period, only the inner main shaft 7 rotates, causing a phase difference between the two shafts.
Like the inner main shaft 7, it is supported and connected to the joint member 24 eccentrically by a by a, and since the joint part If; t24 is integrated with the outer main shaft 2 in the rotational direction, it can freely rotate together with the inner main shaft 7. .

Furthermore, although the draw bar 14 moves in the axial direction due to the operation of the draw device 26, this is absorbed by the movement of the joint member 24 in the axial direction with respect to the outer main shaft 2.

The main shaft device of a boring machine according to the present invention is as described in detail above, and has an outer main shaft 2 that is rotationally driven by a main shaft motor 6.
An inner main shaft 7 is installed eccentrically in parallel and rotatably inside the inner main shaft 7, and a correction dreaper 14 is moved in the axial direction within this inner main shaft 7.A drawbar 14, which is installed coaxially inside the inner main shaft 7, is moved in the axial direction. While fixing the boring bar 8 which corrects the cutting diameter by doing this,
"Row/(-14) is connected to the draw device 26 via a rotary joint device that is provided at the base end of the outer main shaft 2 and rotates while absorbing the eccentricity of the draw bar 14 with respect to the outer main shaft 2, Furthermore, since a driving means is provided between the outer spindle 2 and the inner spindle 7 to change the relative position of the two spindles 2.7 in the rotational direction, the cutting diameter can be corrected by elastic deformation of the chip cartridge 1°. By rotating the inner spindle 7, the cutting diameter can be changed greatly depending on the amount of eccentricity of the inner spindle 7 with respect to the outer spindle 2. This can be done extremely easily without replacing the part 10, and it is also possible to automate this setup change.Also, the setup change mechanism is separated from the correction mechanism, and Since this part is only used when replacing it, this part, namely screw gear 15 and tick 16.
．． The threaded part 16 has little wear, can withstand long-term use, and is reliable.

[Brief explanation of drawings]

Figures 1 to 3 show a conventional example, with Figure 1 being a sectional view and Figure 2 being an enlarged sectional view showing the main parts of the boring bar.
Figure 3 is a plan view of the chip cartridge. Figure 4 and subsequent figures show embodiments of the present invention. Figure 4 is a sectional view, and Figure 5 is an enlarged sectional view taken along line V-V in Figure 4. 6 and 7 are action explanatory diagrams. 2 is the outer spindle, 6 is the spindle motor, 7 is the inner spindle, 8 is the boring bar, IQ is the chip cartridge, 12.14
15 is a drawbar, 15 is a threaded gear, 16 is a rack, 17 is a rack holder, 20 is a bracket, 21 is a cylinder device, b is a half-hole outlet =; width 1; 24 is a joint member, 25 is a rotary joint, and 26 is a draw device. Figure 5 17

Claims (1)

[Claims] An inner main shaft 7 is installed eccentrically in parallel and rotatably inside the outer main shaft 2 which is rotationally driven by a main shaft motor 6, and a correction lever 14 is moved in the axial direction within the inner main shaft 7. The inner main shaft 7 is arranged coaxially, and at the tip of the inner main shaft 7,
The cutting diameter is corrected by moving the dolly bar 1 coaxially in the axial direction.1) The boring bar 8 is fixed, and its drawbar 14 is attached to the base end of the outer main shaft 2. It is connected to the draw device 26 via a rotary joint device which is provided and rotates while absorbing the eccentricity of the pull bar 14 with respect to the outer main shaft 2, and between the outer main shaft 2 and the inner main shaft 7, an amphiphilic shaft is provided. 2.7 A main shaft device for a boring/boring machine, characterized in that it is provided with a drive means for changing the relative position in the rotational direction.