JPH0122104B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to an automatic attachment/detachment device for a dustproof cover of an attachment attachment portion of a spindle in a machining center when the spindle attachment is not attached.

Prior art As machining centers become more diverse in their processing, vertical spindle types are equipped with an attachment S that has a horizontal spindle, allowing them to perform not only vertical machining but also horizontal machining.
In other words, machines have been manufactured to machine the side surfaces of workpieces. When the attachment is not used at all in such a machine, a cover is attached to the attachment mounting part to protect against chips or dust, but automatic attachment types, for example, have a cover attached to the attachment mounting part to fit the attachment into the positioning part. After the female spline-like engagement crest of the clamp ring passes axially between the male spline-like engagement troughs of the clamp ring, it is necessary to rotate the cover in the same way as when the two ridges are aligned in phase and engaged. There is. For this reason, this type is provided with an actuator for rotating the cover, but this requires additional space, which not only impairs work efficiency but also increases costs. A similar dustproof cover device is also known as Utility Model Application No. 57-173943. This device is designed so that the cover can be moved up and down on the conveyance table of the attachment exchange conveyance device, and is installed together with the cradle of the cover in a holder frame that can be rotated around a vertical axis, and the phase can be adjusted with the clamp claw when attaching or detaching the cover. Because the receiver frame of the cover is rotated, a separate device for rotating the receiver frame is required. Furthermore, since the conveying device includes a driving device, there is a problem that the height of the conveying device becomes high.

Purpose Therefore, the present invention seeks to provide an automatic mounting device for an attachment mounting part cover that can be easily and reliably automatically attached and detached by using a rotation positioning means of the main shaft without providing a dedicated actuator for rotating the cover. It is.

Solution: In a machine tool having an attachment mounting device that has means for rotating and positioning the spindle at a predetermined angle and has an attachment clamp ring having a spline-shaped ridge, an attachment clamp ring that covers the lower side of the attachment mounting portion of the spindle is used. A ring-shaped cover having a female spline-shaped part having a crest that engages with a male spline-shaped engagement ridge part is placed, and a positioning pin of the cover is implanted to engage with a tool positioning key of the main shaft. The device includes a cover mounting base provided with a groove and a cover mounting base rotatably provided with the cover mounting base, and the engaging ridge portions are aligned in phase by indexing means of the main shaft.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. In a machining center (not shown), the attachment exchange device on the spindle side is attached to the lower end surface of a spindle sleeve (not shown) that rotatably supports the spindle 1 having two tool positioning keys 1a on the lower end surface, and is concentric with the center of the spindle. A positioning carby coupling 2 or other coupling or pin, and a male spline-shaped engagement ridge 3 which is slidable in the axial direction inside the coupling 2 and has a male spline shape on the lower edge of the outer periphery.
A clamp ring 3 is provided which has a ridge portion 3a which is moved upward in the figure by pressure oil. The connecting part of this mounting device, the cover 4 that protects the clamp ring from dust, passes between the crests of the male spline-shaped engagement ridges 3a of the clamp ring 3, and is formed of a female spline that can be engaged with the ridges. shaped engagement ridge 4
a, the upper surface has a contoured surface that covers the lower surface of the attachment mounting part, the lower side is flat, and the lower surface of the main shaft 1 has a hole 4b in the shape of a ring. Then, when the cover 4 is rotated so that the phases of the peaks match and are brought into an engaged state and lifted by the clamp ring 3, the notch 4c through which the claw portion 10a of the presser claw 10 (described later) passes will be cut against the surface of the hole 4b. In addition, a positioning pin 5 of a length that does not interfere with the rotation during rotation is inserted into a hole 2a drilled at a predetermined position of the carboxylic coupling 2 of the spindle sleeve, and is implanted in the upper surface parallel to the spindle axis. A position pin hole 4d is bored to determine the position of the cover mounting table. The cover stand 7 is arranged in parallel with the attachment magazine 13 at the end of a table of a machining center (not shown), and a cover mounting stand 9, which is rotatable around a vertical axis and has a flat top surface, is supported by a bearing 8. ing. This cover mounting table 9 has a circular arc hole 9a that penetrates in the axial direction on the same circumference as the center hole 4b when the cover 4 is placed, and the circular arc hole 9a is fixed to the cover table 7. The provided presser claw 10 penetrates through it. The upper end of the presser claw 10 has a claw 10a that engages with the inner edge of the hole 4b of the cover 4.
can pass through the notch 4c of the hole 4b. Two grooves 9b that engage with the tool positioning key 1a of the main spindle 1 are cut into the upper surface of the cover mounting table 9, so that when the main spindle key 1a is fitted, it can be rotated together with the main spindle.
Further, a positioning pin 6 that fits into a positioning pin hole 4d of the cover 4 is implanted on the upper surface in relation to the engagement ridge 4a. Further, grooves 9d and 9e in the direction of the pivot axis are cut at two places on the circumference of the side surface of the cover mounting table 9, and these grooves are formed to engage the male spline-like engagement ridge 3a of the clamp ring 3 and the female spline-like engagement of the cover 4. They are located at a position where the peak portions 4a are completely out of phase and at a position where the phases match, respectively, and act on the limit switches LS1 and LS2 provided on the cover base 7 by turning. In addition, grooves 9d and 9e are provided on the lower surface of the cover mounting table 9 to act as a limit switch.
A recess 9f is bored at the position, and a ball 12 urged upward by a spring 11 inserted into the hole 7a of the cover stand 7 is inserted to position the cover mounting stand 9. Further, a portion of the side surface of the cover mounting table 9 is cut out and a limit switch LS3 is fixed thereto to confirm whether the cover 4 is placed on the cover mounting table 9 or not.

Next, the action will be explained. The cover mounting table 9 has a groove 9d.
has turned on the limit switch LS1, and the engaging ridge of the cover 4 determined by the positioning pin 6 is out of phase with the engaging ridge of the clamp ring 3, and is in a state where it can pass. Therefore, in order to attach the cover 4, the presser claw 10 is positioned on the top surface of the cover mounting table 9.
The spindle head of a machining center (not shown) is positioned so that it is concentric with the cover 4 engaged with the inner edge of the cover 4. The indexing spindle sleeve is lowered to engage the key 1a of the spindle 1 with the groove 9b of the cover mounting table 9. At this time, the engagement ridges 3a of the clamp ring 3 pass between the engagement ridges 4a of the cover 4 and are located on the lower side where they do not interfere. When the main shaft 1 turns, the key 1a turns the cover mounting table 9. When the ball 12 turns by a predetermined amount, it reaches the recess 9f.
The cover mounting table 9 is inserted into the cover for positioning.
The rotation of the main shaft 1 is stopped by the signal from the groove 9e that turns on the limit switch LS2. cover 4
are rotated by a predetermined amount, and at this position, the engagement ridge 4a is in phase with the engagement ridge 3a of the clamp ring 3, and the claw 10a of the presser claw 10 is aligned with the notch 4c of the cover 4. When the alignment of the engagement ridges is completed, the clamp ring 3 is pulled up by hydraulic pressure, and the engagement ridges 3a engage with the lower side of the engagement ridges 4a of the cover 4, lifting the cover 4 and removing the positioning pin 5.
is inserted into the pin hole 2a of the carboxylic coupling 2 and crimped onto the lower surface of the main shaft sleeve. At this time, the claw 10a passes through the notch 4c of the cover 4 and leaves the cover 4. Upon completion of the cover installation, the spindle head moves to the machining position. To remove the cover 4, the spindle head is positioned concentrically with the cover stand 7, the spindle 1 is indexed to a predetermined position, the spindle sleeve is lowered, and the key 1a is engaged with the groove 9b of the cover mounting stand 9. When the pressure oil that is pulling up the clamp ring 3 is removed and the clamp ring 3 is pushed down by a spring (not shown), the lower surface of the clamp ring 3 pushes down the cover 4 and pulls out the positioning pin 5 from the pin hole 2a.At the same time, it is inserted into the pin hole 4d. The positioning pin 6 is inserted. At this position, the claw 10a of the presser claw 10
passes through the notch 4c of the cover 4 and is located on the upper surface of the cover 4. The main shaft 1 is rotated in a predetermined direction to completely shift the phase of the engaging ridges 3a, 4a.
At the position where the ball 12 is fitted into another recess 9f of the cover mounting table 9, the groove 9d turns on the limit switch LS1, and the rotation of the main shaft 1 is stopped. Then, when the main shaft sleeve rises, the claw 10a of the presser claw 10 moves to the cover 4.
Even if the main shaft sleeve is held down and stuck due to friction, it is forcibly removed and received on the upper surface of the cover mounting table 9.

Effects As described in detail above, the present invention engages the cover mounting base with the key of the main shaft, and aligns the engagement ridges of the clamp ring that fixes the cover to the main body side with the engagement ridges of the cover. Since this is performed by indexing and turning the main shaft, there is no need for an actuator dedicated to turning the cover, which contributes to cost reduction and allows the height of the stand to be lowered. Moreover, since there is no need for piping to connect to the fluid pressure source, the cover stand has the feature of being compact.

[Brief explanation of drawings]

FIG. 1 is a plan view of a magazine storing attachments and a cover stand, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1 of the cover stand on which a cover is placed. 1...Main shaft, 3...Clamp ring, 3a...
Engagement crest, 4...Cover, 4a...Engagement ridge, 4
c... Notch, 5, 6... Positioning pin, 7... Cover stand, 9... Cover mounting stand, 9a... Arc hole,
9b...Groove.

Claims (1)

[Claims] 1. It has an indexing means for rotating and positioning the main shaft at a predetermined angle, and has a male spline-like engagement ridge part on the lower end surface of the main shaft sleeve that engages with a female spline-like ridge part of the attachment to fit the attachment. In a machine tool having an attachment mounting device equipped with a clamp ring that clamps by pressure, a ring-shaped cover that covers the lower surface on which the attachment is mounted and has the same peaks as the female spline-shaped peaks of the attachment, and the cover is mounted. A spindle indexing means comprising: a cover mounting base having a positioning pin for positioning the cover and a recess cut out to engage with a tool positioning key of the spindle; and a cover stand on which the cover mounting base is rotatably provided. An automatic attachment/detachment device for an attachment mounting part cover, which is characterized by matching the phase of spline-shaped peaks.