JPS59196101A - Spindle head - Google Patents

Abstract

PURPOSE:To enable a complicated contour to be surely and easily formed, by continuously controlling the tip position of a tool in its machining diametric direction through a numerical control device. CONSTITUTION:A motor is started to continuously rotate a hollow main spindle 8, both moving the whole unit of a spindle head 6 in the direction of a Z-axis by turning a pulse motor to be controlled with a numerical control device and rotating a rotary shaft 15 by turning the pulse motor 12 to be controlled similarly with the numerical control device. In accordance with rotation of this rotary shart 15, a moving cylinder 19 is displaced in the direction of the X-axis, and a tool 66 is moved in the diametric direction of a work through a round rack 20, pinion 38 and a tool holder 30. Here a backlash removal device provided on the pinion 38 serves to continuously control a tip of the tool 66, during its rotation around the moving cylinder 19, to be correctly moved in the diametric direction of the work, and combination of movement of the tool with the continuously controlled displacement of the whole unit of the spindle head 6 in the direction of the Z-axis enables a desired contour to be machined for a water pipe (the work).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spindle head used in a boring machine such as a cross-boring machine, and more particularly to a spindle head that allows numerical control of the position of the cutting edge.

Conventionally, for example, as shown in Fig. 1, the inner diameter of the cutting part was 300 mm.
Processing the end of a water pipe 60 with a large diameter of ~700mm
The profile of the machining section was probably different from that of the ItTi boring machine, and the 1st part of the step stool 61.
, 62, the tapered surface 63, and the edge 64 must be machined, so the only way to do this is by skilled hands or by using a complicated tracing mechanism.

This invention was made by taking into account the above points.
Contour formation through numerical control ii6! The purpose is to provide a spindle head that can be operated with great ease.

Figures 2 to 5 below? From this, an embodiment of this invention σ) will be described.

Bed 1 is water guideway 1 in the longitudinal direction (Z-axis direction)
a, on which the movable platform 2 can freely slide (
This is supported and reciprocated by a ball screw 5 connected to a pulse motor 3 via a gear box 4. A spindle head 6 is installed on the movable table 2, and a box-shaped headstock 7, which forms the base of this spindle head, is fixed to the movable table 2. A cylindrical hollow main shaft 8 is rotatably supported on the headstock 7 by a bearing 9 with its axis 8a directed in two axial directions, and a facing head 10 in the form of a short hollow cylinder is fixed to the front end of the hollow main shaft. It is. The headstock 7 has a flanged cylinder shape:
The pulse smoke 12 is now removed through the tool 11. Mounting tool 11 and 7 bearing 1 on acing head 10
The output shaft of the pulse smoke 12 is connected via a coupling 17 to a rotating shaft 15 which is supported via a shaft 3.14 and rotatable around the axis 8a of the hollow main shaft. Rotating axis 1
5 is provided with a wetting portion 18 at one end, and this wetting portion is inserted into the facing head 10. A movable cylinder 19 is screwed into the wetting part 18, and a nine rack 20 is rotatably fitted into the movable cylinder. On the other hand, the other end of a cylindrical holding cylinder 22 whose one end is guided by a sleeve 21 fixed to the hollow main shaft 8 so as to be slidable in the direction of the cicada and relatively rotatable is fixed to the movable cylinder 19, and the attachment is still attached. 11
The base of a rod 23.23 that slidably passes through the partition wall is fixed to one end of the holding tube 22, and the rod 23 and the holding tube 22 guide the movable tube 19 in a swingable manner in the Z-axis direction. A detent device 24 is formed. The leading end of one rod 23 (the fixed cam 25 is adapted to actuate limit switches 26 and 27, and the facing head) X perpendicular to the axis 8a of the shaft
The tool holder is movable in the direction of the axial force.
It consists of a holder main body 31 that is slidably slidable on the boulder main body, and a flange portion 32 that is fixed to the boulder main body so that the position of the j1 holder can be changed. T inserted into Pi'7533 with ILQ: in the direction of
The nut 35 has a hole θ) for fixing the flange portion 32.
4 is inserted. Holder body: 031 ft
111 (1jll inside the facing head) +
This is a rack 3 (5 or 5 engraved.) Also, in the machining hent 10, a pinion 3 or
8 is rotatably supported.

Binion 38 is a backlash removal device with a built-in spring 39 that forces two overlapping gears in opposite directions.ftff
1.What is it? Further, the driven gear 40 fixed to the hollow main shaft 8 is connected to the drive shaft 4.1r rotatably supported on the head stock 7.
The fixed drive gear 42 meshes with each other, and the drive shaft 41 has a hollow main shaft! Output shaft of morph 43 for driving or belt transmission 4
It is connected via 4.

On the other hand, in front of the head 1, there is a water supply "i'=
Equipped with L-type clamp claws 50.
A C-clamp stand 52 is installed, and furthermore, a workpiece stand 56 equipped with a saddle-shaped jig 55 for supporting a water pipe 60 is installed in front of this clamp stand. Naori lamp stand 5
2 and the workpiece pedestal 56 are
't or the jlQl+ line of the supported water pipe 60 is centered so as to substantially coincide with the axis 8a of the hollow main shaft.

A hollowing device consisting of the above-mentioned devices (for cutting the water pipe 60, place the zz<ih66 on the tool holder 30), a hole I-67t, a clamp stand 52, and a workpiece receiver. The water pipe 60 is fixed by the stand 56. Next, the motor 43 is started to continuously rotate the hollow main shaft 8, and the pulse motor 3 is controlled by a numerical control device (not shown) to rotate to 0" to move the entire main spindle head 6 in two axial directions, and the pulse motor 12 is Similarly, the rotation is controlled by a numerical control device to rotate the wide shaft 15 once. The rotation of the rotating shaft 15 causes the movable cylinder 19 that engages the male threaded portion 18 to move in two axial directions, and the round rack 20 is pushed in the Z1lQ11 direction by this movable cylinder. This movement of 9 ranks 20 is performed by the tool holder 30 via the pinion 38.
In this way, the rotation of 4Tll+15 is converted into movement of the tool holder 30, that is, the cutting tool 66. In addition, Sole Boulder-30, Binion 3
8 and the round rack 20 that meshes with it rotate together with the facing Rad 10, so the round rank 20
will move in the Z dIII+ force direction while moving around the moving cylinder 19 on four axes. Since the binion 38 is equipped with a backlash removal device, the cutting edge of the cutting tool 66 can be moved in the diametrical direction of the work piece continuously and accurately by controlling the pulse smoker 12, and the spindle head 6 can be moved by the pulse smoker 3. By combining this with continuous control of movement in two axial directions as a whole, it is possible to machine the water pipe 6i into a desired contour as shown in FIG. 1. Note that the tool holder 30 can be
The amount of movement can be set sufficiently large to obtain the desired machining diameter (α circumference).

For workpieces with different diameters, tighten the tool holder 30, loosen the port 34, change the mounting position of the clamp part 32 with respect to the holder body 31, and bring the workpiece within the movement range of the cutting tool 66. You can adjust it accordingly.

The present invention is not limited to the above-mentioned embodiment. For example, in the above-mentioned embodiment, a workpiece is fixed, and a spindle head 6 with a hollow spindle 8 arranged concentrically with the workpiece is moved only in two axial directions. However, as shown in Figure 6, the bed 7
A lifting platform 72 is supported vertically movably on a column 71 that is movable in the Y-axis direction above 0 to center the center of the boring, and the spindle head 6 is moved in two axial directions on this lifting platform 72. It is also possible to swivel it and use the pulse motor 3 to control the movement in the Z-axis direction. In this case, it is possible to perform machining at multiple locations on a large workpiece.

In addition, -1-, in the described embodiment, one binion 38 is used as the gear on the side of the backlash removing device that meshes with the round rack 20 and the rack 36t of the tool holder, or instead of this, a plurality of binions that mesh with each other are used. A gear train may also be used, and in this case, the tool holder 30 can be easily positioned at a sufficient distance from the axis 3a of the hollow main shaft, and is particularly suitable when the diameter of the force 11 is large.

Further (as this tool holder 30, the holder main body 31
A structure in which the clamp portion 32 and the clamp portion 32 are fixed together may also be used.

The above has described a device for machining the inner diameter, stepped portion, tapered surface, and end face of a workpiece, but according to the spindle head of the present invention, it can also process grooves, threads, etc. from the inner diameter side.
Spherical and other arbitrary curved surfaces can be processed by numerical control.

As explained above, according to the present invention, the position of the cutting edge in the machining diameter direction of the cutter can be continuously controlled by a numerical control device, and by combining this with the position control of the entire spindle head in the machining center axis direction, various shapes can be formed. The contouring of the inner diameter and end face of the can be reliably and easily formed by numerical control.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing an example of a workpiece machined by the device of the present invention, FIG. 2 is a front view of a boring device showing an embodiment of the invention, and FIG. FIG. 4 is an enlarged sectional view taken along the line A-A in the figure, FIG. 4 is a sectional view taken along the line B-B in FIG. 3, FIG. 5 is a sectional view taken along the line C-C in FIG. FIG. 2 is a perspective view of an example boring device. 6 ・Spindle head, 7... Headstock, 8... Hollow spindle, 1
0 Feshinoghetsu F, 12...Pulsmoke, 15
... rotation shaft, 18 ... bedwetting part, 19 ... movable cylinder, 20 ... round rack ~, 24 - rotation prevention device, 3
o...Tool holder, 3 topolder body, 32...Clamp part, 36. Rack, 38...Binion, 43.
motor.

Claims (1)

[Claims] l A headstock, a hollow spindle rotatably supported by the headstock, a facing head fixed to the front end of the hollow spindle, and a threaded portion at one end. The facing part was inserted into the facing head with the facing head upright, and was supported rotatably around the 11ub line of the hollow main shaft. a rotating shaft, a movable shaft screwed into the external threaded portion indicated by -1-;
1. a detent device connected to the bag-filled candy and slidably guiding the movable tube along the longitudinal force surface; 1 turn around the above moving cylinder
The 9th rank can be moved freely and the 1) 11th side of the above facing head can be moved freely in the target direction of the Akira 7 facing head? ? - Take - 1 tool holder with a rack on the inside surface and the above facing bed?
a gear with a backlash remover that is supported on this shaft and meshes with the above-mentioned rack and the above-mentioned nine racks; a servo motor connected to the rotating shaft; and a hollow main shaft driving motor connected to the hollow main shaft. Spindle head. 2. The spindle head according to claim 1, wherein the gear with a backlash remover comprises one pinion. 3. The spindle head according to claim 1, in which the gear with a backlash remover comprises a gear train composed of a plurality of mutually meshing binions. 4. The main body of the holder in which the tool holder is provided with a rack. A spindle head according to claim 1, 2, or 3, comprising: and a clamp portion fixed to the holder main body so that the position of the plate can be changed.