JPS6020807A - Boring device - Google Patents

Abstract

PURPOSE:To improve a corresponding characteristic to a bore size and corrective accuracy of wearing, by mounting a boring quill having a tool push-out capably in a direction crossing at a right angle with an axial line to an eccentric shaft rotatable for single indexing and rotatable integrally with a main spindle. CONSTITUTION:A clamp rod 17 advances to engage a clamper 18 with an engagement face 19 of an eccentric shaft 5 by a clamping spring 20, and a main spindle 3, eccentric shaft 5, movable cylinder 10 and a connecting shaft 32 integrally rotate causing a tool 7 in the end of a boring quill 6 to draw a turning locus around the center line 01 of the main spindle 3 serving as the center. Here a radial length of this locus is adjusted by turning clockwise a turning lever 26 through a cylinder 24 so as to shift leftward a moving sleeve 22 and disengage the clamper 18 from the engagement face 19 and turning a feed screw 15 by a dividing servo motor 13 so as to divide the eccentric shaft 5 in its rotation through a connecting member 12 and the movable cylinder 10. Thus a corresponding characteristic is improved for an optional bore size.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a boring device for cutting a hole in a workpiece.

<Prior Art> A multi-stage stocking device that can accommodate different machined hole diameters is known from Japanese Utility Model Application Publication No. 55-75403.

However, in this conventional device, in order to accommodate a wide variety of hole diameters, the cam member must be lengthened to form a multi-stage cam surface, which results in longer tiles that are more likely to run out. The positioning mechanism is also complex. Therefore, in reality, it was only possible to accommodate about two types of hole diameters.

<Objective of the Invention> The present invention allows a cutting tool to be adapted to any hole diameter without increasing the length of the boring quill, and allows highly accurate thickness correction.

<Structure of the Invention> The present invention has an eccentric shaft supported in a main shaft rotatably supported on a shaft head main body at a position eccentric to the main shaft axis so as to be rotatable independently and integrally with the main shaft 41. A boring quill with a cutting tool attached to the tip of the eccentric shaft so that it can move forward and backward in a direction perpendicular to the axis of the eccentric shaft is installed.
i This is a boring device configured to include a rotary indexing mechanism for rotationally indexing to the above position.

<Example> Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, reference numeral 1 denotes a slide table that moves on the base of the circuit parallel to the axis of the main shaft.

A spindle head 2 is fixedly mounted on the slide table 1, and a spindle 3 is rotatably supported on the spindle head 2 by a bearing. A pulley 4 is fixed to the rear end of the main shaft 3, and a belt is hung between it and the motor of the circuit.

An eccentric shaft 5 is supported within the main shaft 3 at an axis 02 that is eccentric with respect to the main shaft axial center line 01 so as to be capable of independent index rotation and rotation integrally with the main shaft 3. The eccentric shaft 5 is attached to the tip of this eccentric shaft 5.
A boring quill 6 is attached concentrically with the axis 02 of the. A cutting tool 7 is attached to the boring quill 6 and is swiveling therethrough, which can move forward and backward in a direction perpendicular to the axis 02 of the eccentric shaft 5.

Reference numeral 8 denotes a flexible portion that allows the cutting tool 7 to move forward and backward.

The independent index rotation mechanism of the eccentric shaft 5 is as follows. A lead screw 9 is provided on the outer periphery of the rear end portion of the eccentric shaft 5, and a movable cylinder 10 is fitted onto the lead screw 9. This movable cylinder 10 can be relatively slid in the axial direction within the main shaft 3, and the direction of rotation is an integrally rotating hinge with the main shaft 3 (a key member 11 engages with the main shaft 3. The end protrudes outward from the rear end surface of the main shaft 3, and a connecting body 12 is coupled to the protruding rear end of the movable cylinder 10 to allow rotation of the movable cylinder 10 and restrict movement in the axial direction. This connecting body 12 is connected to a gear box 14 which is fixed to the spindle head 2 via a busket, etc.
The feed screw 15 is screwed through a nut 16 to a protruding feed screw 15 with an I/I line, and the feed screw 15 rotates the gear machine 4 in the gear box 14 by forward and reverse rotation of a servo motor 13 fixed to the gear box 14. The connecting body 12 is rotated at a deceleration speed, and the connecting body 2 is moved forward and backward, and the forward and backward movement of the connecting body 12 is transmitted to the movable cylinder 10.
is indexed and rotated around its eccentric axis 02.

Furthermore, eccentric shaft 57! 'The mechanism for rotating it integrally with the main shaft 3 is as follows. A lung rod 17 is provided on the main shaft 3 parallel to its axis so that it can be moved in the axial direction, and a cranometer (18) is provided at the tip of the clamp rod 17. A spring force is provided for the pushing crank.
This forward movement of the clamp rod 17 causes the clamp rod 17 to move forward.
The main shaft 3 and the eccentric shaft 5 are integrally connected in the rotational direction by engaging with the engagement surface 19 provided on the outer periphery of the tip of the 8 force 1 eccentric S5.
reactor. At the time of independent index rotation of the eccentric shaft 5, the clamper 18
Since it is necessary to disengage from the engagement surface 19, a movable block 21 is provided at the rear end of the clamp rod 17 as an unclamping mechanism, and a movable ring 22 is mounted on the main plate 13.
′? : Provided to be slidable in the axial direction and rotatable relative to the main shaft 3. And, 1-piece movable block 21
and the moving ring 22 are connected by a connecting pin n. Furthermore, an unclamping cylinder row is installed on the spindle head 2, and an engagement block 25 is provided at the end of the piston rod. this engagement].

Between the lock 5 and the moving ring n, one end of a rotating lever is pivoted to the spindle head 2, which is rotatable in the front and back direction and has a diameter of <-26, by means of a pivot pin 27. The clamp rod 1 is engaged with a block 5, and the other end is engaged with a moving ring n via an engagement roller 51 as shown in FIG.
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The spring mark is moved backward against the forward pushing force of the spring mark to unclamp and tilt 5.

Next, a mechanism for advancing and retracting the cutting tool 7 at the tip of the boring quill 6 will be explained with reference to FIGS. 1 and 2. This movement of the cutting tool 7 back and forth is mainly a protrusion for correcting wear of the cutting tool 7. As described above, the cutting tool 7 is attached to the tip of the boring quill 6 so as to be movable forward and backward by the flexible portion 8. Therefore, a protruding rod 29 is provided so as to be able to slide forward and backward in the axial direction of the boring quill 60 in the 1c axis direction. A cam surface 30 is formed at the tip of the protruding rod, and a movable pin 31 is interposed between the cam surfaces and the back surface of the cutting tool at 7 degrees. The cutting tool 7 is extended through the pin 31. The rear end of the protruding rod 4 is connected to the tip of a reciprocating shaft portion that extends vertically through the axial center of the eccentric shaft 5. Advance and retreat again + tl + 28
0 rear end is joined to the tip of a connecting shaft 32 concentric with the main shaft 3. As described above, this connecting shaft 32 is concentric with the main shaft 3, rotates integrally with the main shaft 3, allows forward and backward movement in the axial direction, and is connected to a forward and backward axis path concentric with the axis 02 of the eccentric shaft 5. There must be. Therefore, the joint 33 engages the main shaft 3 in the rotational direction and allows movement in the axial direction. The rear ends of the forward and backward shaft rows of this joint are connected to each other so that they can rotate relative to each other and are restrained from moving in the axial direction.

A correction device for moving the connecting shaft 32 forward and backward to extend the cutting tool 7 is shown in FIG.

That is, the connecting shaft 3 is mounted on a support base 34 fixed on the same slide tape /l/1 on which the spindle head 2 is fixed.
A cylinder A concentric with 2 is provided, and a piston 36 is inserted into this cylinder part so as to be movable forward and backward. This piston 36
Piston rods 37a-137b are provided on both left and right sides of the cylinder and project outward from both left and right side walls of the cylinder. A connecting block 39 is provided at the tip of one of the piston rods 37a, and the rear end of the connecting 1hlI32 is connected to this while allowing rotation and restricting movement in the axial direction. Further, an intermediate block is provided on the piston rod 37a, and a detent '4'+b 42 that is orthogonal to the axis of the piston rod 372 is protruded from the intermediate block 38.
A bracket 400 fixed to the supporting line is in contact with a guide surface 41.

Further, a stopper cylindrical shaft 43 is fitted onto the other piston rod 3Vb so as to be slidable in the axial direction, and the tip of the stopper cylindrical shaft 43 protrudes so as to be retractable into the cylinder 35 marked 131J. This stopper fil ll++] 43
A screw 52 and a spline 49 are provided on the top, and the screw 5
2 is spring-fitted to a fixing nut 44 fixed to a support plate, and a spline 49 is a large-diameter gear 4 rotatably supported on a support base.
8 is spline fitted. Further, a pulse motor 45 for protruding the cutter is fixed on the support base 34, and the large diameter gear 48 is mounted on the rotation shaft 46 of this pulse motor 45.
A small-diameter gear 47 that meshes with is provided. Reference numeral 50 denotes a rotation amount detection device of the pulse motor 45, which is composed of, for example, a toothed wheel and a proximity switch.

Since the present invention has the above-described structure, when machining the hole diameter of a workpiece, the clamp rod 17 is moved forward by the force of the clamp spring, and the clamper 18 engages with the engagement surface 19 of the eccentric shaft 5. The main shaft 3 and the eccentric shaft 5 rotate in the same direction. Therefore, the rotational force transmitted to the pulley 4 causes the main shaft 3 and the eccentric shaft 5 to rotate together. Further, the movable cylinder 10 screwed into the lead screw 9 of the eccentric shaft 5 also rotates together with the main shaft 3 and the eccentric shaft 5. Further, the connecting shaft 32, which engages the movable cylinder 10 only in the rotational direction, also rotates integrally with the main shaft 3.

The eccentric shaft 5 that rotates integrally with the main shaft 3 is the main! 1! ! lI3
It rotates around the axis 01 of. Therefore, the turning locus of the cutting edge of the cutting tool 7 at the tip of the boring refill 6 is the axis center m of the main shaft 3.
The radius is a circle centered on O1, and the length of this radius is the main axis 3.
Eccentric shaft 5'? : It is changed by rotating and indexing to an arbitrary position.

The indexing of the eccentric shaft by 50 rotations by changing the diameter of the machined hole is performed by the following operation. First, the unclamping cylinder is activated, and the rotary lever 26 is rotated clockwise in FIG. 1 to shift the movable lever 26 to the left. By this shift of the adjusting sleeve 22 to the left, the clamp rod 17 is also shifted to the left by compressing the clamping spring force, and the clamper 18 is disengaged from the engagement surface 19 and engaged with the main shaft 3 and the eccentric shaft 5 in the rotational direction. is released, allowing the eccentric shaft 5 to rotate independently.

Next, the servo motor 13 that has received the required index signal rotates in either forward or reverse direction, causing the feed screw 157 to rotate. Based on the rotation of the feed screw 15, the connecting body 12 moves forward and backward, causing the movable cylinder 10 to move forward and backward. As the movable cylinder 10 moves forward and backward, the eccentric shaft 5 is rotated forward and backward by the lead screw 9, and the center diameter length of the cutting edge of the cutting tool 7 with the axis line o1 of the main shaft 3 as the center hole L is set to the hole diameter to be machined. It is determined accordingly.

Next, the operation for correcting the wear of the cutting tool 7 is as follows. That is, the pulse motor 45 operates based on the correction command, causing the small gear 47 to rotate the large gear 48 . This big gear 4
The rotation of 8 is transmitted to the stopper cylinder shaft 43 by the spline 49, and the stopper cylinder @43 is slightly moved to the left in FIG. is slightly retracted to define the retracting end (leftward advancing end in the figure) of the piston 36.

Therefore, the piston 36 is at the forward end and the cutter 7 is at the retracted position where it is most released, but by moving the piston 36 to the retracting end defined by the stopper cylinder shaft 43, the piston rod 37α, the connecting shaft 32, and the forward and backward The protruding rod is moved backward via the shaft 28, and the cutting tool 7 is protruded by the required correction amount via the movable pin 31 due to the cam surface force.

In addition to the correction protrusion due to the wear of the cutting tool 7, when the boring quill 6 is pulled out from the hole after cutting the hole, the piston 36 is moved to the forward end to move the cutting tool 7 backward and escape. It is also used to prevent scratches on the machined surface by preventing it from hitting the machined surface.

<Effects> As described above, according to the present invention, the cutting radius of the cutting tool at the tip of the boring quill can be set steplessly by indexing rotation of the eccentric shaft with respect to the main shaft. It can be adapted to different hole diameters, and
The tiles can be cut without wobbling. In addition, the tool's protrusion mechanism allows highly accurate wear correction of the cutter, and this protrusion mechanism also has the remarkable effect of being able to pull out the tile from the workpiece without damaging the cutting surface. have.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the shaft head of the present invention, FIG. 2 is a sectional view of the cutting tool correction actuating device, and FIG. 3 is a sectional view taken along the line I-II in FIG. 1...Slide table, 2-...Main shaft cylinder, 3 fists...
Main shaft, 5... working eccentric shaft, 6 fist... middle, refill, 7.
・・Cutter, 9 es・Saw 2nd screw, 10・・Movable tube, 12・・Q connection body, 13・Φ・Servo motor, 15
・Feed screw, 17・Φ・Clamp rod, 18@・
・Clamper, 19...-Engaging surface, 20-... Spring for clamp, Su... Cylinder for unclamping, 40.
Fist advancement/retraction axis, 29... Thin rod, 30-... Cam surface,
32... Connection shaft, 34... Support stand, 35... Cylinder, 36... Piston, 37α, 37b... Φ piston rod, 43... Stopper cylinder shaft, 44φΦ fixing nut, 45- --Pulse motor, 47. . , small gear,
48・War・Large gear% 49...Spline, 5o...
Rotation amount detection device, 52...screw.

Claims (1)

[Claims] The eccentric shaft is rotatably supported on the shaft head body, and the eccentric shaft is supported at a position eccentric to the main shaft axis so that it can rotate independently and rotate integrally with the main shaft. A boring quill having a cutting tool attached thereto so as to be movable forward and backward in a direction orthogonal to the boring quill is provided, a protrusion mechanism for the cutting tool is provided in the boring quill, and a rotation indexing mechanism is provided for rotationally indexing the eccentric shaft to an arbitrary position. Boring processing equipment characterized by: