JPH0593734U - Rotation tool adapter rotation prevention mechanism - Google Patents

Abstract

(57) [Summary] [Object] To provide a rotation stopping mechanism of a rotary tool adapter capable of automatically corresponding to a fixed side engaged portion with which a rotation stopping pin having various axial positions is engaged. A rotation tool adapter rotation stop mechanism 30 is rotatably inserted into and supported by a hollow housing 22 that is engaged with and disengaged from a fixed side of a machine tool, and a hollow housing 22.
An axial guide cylinder 31 fixed to a hollow housing 22 of a rotary tool adapter having a rotary portion A mounted on a main shaft of a machine tool and a tool mounting portion C directly coupled or rotationally engaged with the rotary portion 31. A detent pin 33 that is slidably fitted in the guide cylinder and has a tip that engages and disengages with the fixed side of the machine tool and that projects in the main axis direction; and an elastic means 36 that biases the detent pin in the projecting direction. , An engaging claw arm 35 which is attached to the detent pin so as to be elastically slidable in the axial direction 36 and which can be engaged with and disengaged from a positioning portion 34 formed on the rotating portion.
It consists of and.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotation stopping mechanism for a rotary tool adapter.

[0002]

[Prior Art]

 Conventionally, a rotary unit that is inserted into the spindle of a machine tool, a fixed unit such as a spindle head that is releasably connected to a fixed side, and a tool mounting unit that mounts a tool. An example of a rotation stopping mechanism in a tool adapter is shown in Japanese Utility Model Publication No. 63-34832.

In the rotation stopping mechanism of the rotary tool adapter, the rotary tool adapter is fitted into a pin fitting hole of a support member that is a fixed side member of the rotary tool adapter so as to be able to move back and forth, and a tip end thereof is engaged with a fixed side of a machine tool. A movable pin that is detachable and an anti-rotation member that is engageable and disengageable are integrally connected to an engaged portion of the rotating body of the rotary tool adapter. Since there are various axial positions of the fixed side engaged portion of the machine tool with which the movable pin of the rotary tool adapter engages, the amount of protrusion (rotation stop) of the tip of the movable pin must be adjusted accordingly. A means for adjusting the relative projection amount with respect to the member is provided.

[0004]

[Problems to be solved by the device]

 The axial position of the fixed side engaged portion of the machine tool with which the detent pin of the rotary tool adapter engages varies depending on the manufacturer or model of the machine tool. Therefore, in the rotation preventing mechanism for a rotary tool adapter as described above according to the conventional technique, malfunction or damage may occur unless the position of the rotation preventing pin tip in the axial direction is adjusted. It will be necessary to adjust the axial position of the.

Therefore, the rotary tool adapter has to be equipped with means for adjusting the position of the tip of the rotation preventing pin in the axial direction, and moreover, the operator has to make the adjustment each time, which is inconvenient. The present invention provides a rotation stopping mechanism for a rotary tool adapter that can automatically correspond to a fixed-side engaged portion with which rotation stopping pins having various axial positions are engaged.

[0006]

[Means for Solving the Problems]

 The rotation preventing mechanism of the rotary tool adapter according to the present invention is rotatably inserted into the hollow housing, which is engaged with and disengaged from the fixed side of the machine tool, and is rotatably inserted into the hollow housing and mounted on the spindle of the machine tool. An axial guide cylinder fixed to a hollow housing of a rotary tool adapter having a rotary part and a tool mounting part directly coupled to or rotationally engaged with the rotary part, and slidably fitted in the guide cylinder. , A locking pin with a tip that can be engaged and disengaged on the fixed side of the machine tool protruding in the main axis direction, elastic means for urging the locking pin in the protruding direction, and an elastically slidable attachment in the axial direction to the locking pin And the engaging claw arm that can be engaged and disengaged with the positioning portion formed on the rotating portion.

[0007]

[Action]

 The tool is gripped by the rotary tool adapter by gripping the shank of the predetermined tool on the tool mounting portion. At that time, the engaging claw arm is elastically engaged with the positioning portion of the rotating portion, and the rotating portion, that is, the tool mounting portion and the fixed portion are in a fixed relationship. That is, the tool is maintained in the predetermined relative positional relationship with the fixed portion in the rotational direction. At this time, the detent pin is in a state of protruding from the guide cylinder by the elastic means.

The rotary tool adapter with the tool attached is stored in, for example, a tool magazine of a machining center, grasped by an exchange arm, and attached to the spindle of the machining center in a predetermined angular positional relationship. That is, the rotating part is inserted into the spindle and the rotary tool adapter is fixed to the spindle.

At this time, since the rotary tool adapter retracts to the fixed side of the machine tool, for example, the spindle head side, the tip of the detent pin engages with the fixed side of the machine tool, for example, the engaging portion of the tip surface of the spindle head. The locking pin retracts into the guide cylinder against the spring force of the elastic means, and the engaging claw arm is also pushed toward the guide cylinder, and is disengaged from the positioning part of the rotating part. Elastically retained in the disengaged position. As a result, the fixed part, that is, the hollow housing is fixed to the fixed side of the machine tool, for example, the spindle head, and the rotating part is rotatable with the main shaft with respect to the fixed part. Thus, when the main shaft equipped with the rotary tool adapter is rotationally driven, the tool held by the rotary unit, that is, the tool holding unit, rotates with respect to the hollow housing.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a tool adapter with a built-in planetary roller speed-up mechanism includes a rotating portion A that is inserted into a spindle of a machine tool such as a machining center and a fixed portion that is detachably connected to a fixed side such as a spindle head. It is composed of B and a tool mounting portion C for mounting a tool.

In the rotating portion A, the hollow shaft portion 1 at the tip, the flanged portion 2 at the middle, and the taper shank 3 at the rear end are integrally formed in a coaxial relationship. In the middle of the hollow shaft portion 1, there are formed insertion holes 5 (for example, three at a center angle of 120 degrees) for radially inserting a planetary roller having a rectangular cross section, penetrating from the outer peripheral surface to the center hole 4. ing.

The planetary roller 6 is rotatably attached to the drive pin 7 via a needle roller bearing 8. Then, the planetary roller 6 is radially inserted from the outer diameter side of the hollow shaft portion 1 into the insertion hole 5, and both ends of the drive pin 7 are attached to both ends of the insertion hole 5, whereby the planetary roller 6 is formed. Is rotatably attached to the hollow shaft portion 1 at the insertion hole 5. As will be described later, the rotating portion B is rotatably supported on the fixed portion A by ball bearings 9 and 10 (for example, angular ball bearings having ceramic balls), but the ball bearings are provided at both ends of the insertion hole 5. Inner rings of 9 and 10 are fitted.

Further, a labyrinth seal formed in a brim shape on a cap-shaped member 11 fitted between the grooved flange portion 2 and the ball bearing 9 and on the tip end surface of the ball bearing 10 and the front end of the hollow shaft portion 1. V-shaped seals 12 and 13 each having a lip are fitted to the outer peripheral surface of the hollow shaft portion 1 between the rear end surface and the rear end surface thereof. Further, a V-shaped seal 14 having a lip is attached to the front end surface of the hollow shaft portion 1 adjacent to the labyrinth seal portion of the front end hole of the cap-shaped member 11.

An annular groove 15 and a key groove 16 are formed in the grooved collar portion 2. The former is engaged with a replacement hand of an automatic tool changer, and the latter is engaged with a main shaft key. A pull rod of a main shaft of a machining center is screwed into a screw hole formed in the rear end surface of the taper shank 3, and the taper shank 3 is inserted into the taper hole of the main shaft.

In the fixed portion B, a jacket groove 17 is provided on the outer peripheral surface of the intermediate portion, a ring-shaped fixed raceway surface 18 for planetary rollers is provided on the inner peripheral surface of the intermediate portion, and further, lip portions of V-shaped seals 12 and 13 are provided on the inner peripheral surfaces of both ends. The projecting edge portions are formed in close contact with each other, and the labyrinth seal portion 19 is formed between the rear end surface and the grooved collar portion 2. Further, from the jacket groove 17 to the cutting (grinding) coolant injection port 20 on the front end surface. A hollow housing 22 having a substantially cylindrical shape having a through hole 21 penetrating therethrough is formed, and a jacket cover 23 that covers the jacket groove 17 is fitted on the outer peripheral surface of the hollow housing 22.

A detent device 30 is provided on the outer peripheral surface of the hollow housing 22. In the hollow housing 22 mounted on the outer circumference of the hollow shaft portion 1, the outer races of the ball bearings 9 and 10 are fixed to the inner circumferential surface of the hollow housing 22 on the front and rear sides of the ring-shaped fixed raceway surface 18. The lips of the character-shaped seals 12 and 13 are in close contact with each other, the outer peripheral surface of the planetary roller 6 is engaged with the ring-shaped fixed raceway surface 18, and the inner peripheral surface of the tip portion faces the labyrinth seal portion.

The tool mounting portion C is a rotary shaft 25 rotatably inserted in the center hole 4 of the hollow shaft portion 1 via ball bearings (for example, angular ball bearings having ceramic balls) 24, 24, The rear end of the collet chuck 27 contacts the planetary roller 6 through the sun roller part 26, and the tip part of the collet chuck 27 projects from the tip hole of the cap-shaped member 11 of the rotating part A and grips the shank of the tool T. It is provided. Thus, a flange-shaped labyrinth seal portion 28 is formed in the engagement portion of the rotary shaft 25 with the tip hole of the cap-shaped member 11, and the lip of the V-shaped seal 14 is closely attached to the labyrinth seal portion. is doing. After all, the ring-shaped fixed raceway surface 18, the planetary roller 6, and the sun roller portion 26 constitute a planetary roller speed-up mechanism.

The detent device 30 will be described in detail. As shown in FIG. 2, the detent device 30 includes a guide cylinder 31 having a leg portion 31a protruding radially from the outer peripheral surface and a guide cylinder 31. The oil-tightness is kept inside by an O-ring 32 so that it can be slidably fitted, and the tip of the detent pin 33 projects rearward, and the base part is slidably fitted on the protruding part of the detent pin 33. And a distal end portion 35a is constituted by an engaging claw arm 35 which is freely engageable with and disengageable from a positioning concave portion 34 formed in the front end surface of the grooved collar portion 2.

The guide cylinder 31 is formed with a hollow portion 31b that is open only at the rear end surface, and the communication hole 31c in the leg portion 31a communicates with the hollow portion 31b. The tips of the legs 31a are fixed to the jacket cover 23, and the communication holes 31c communicate with the jacket groove 17 through the through holes 23a of the jacket cover 23.

The rotation stopping pin 33 is a tubular body having a central hole 33b having a stepped portion 33a formed at both end openings, is fitted into the central hole 33b, and has both ends on the bottom surface of the stepped portion 33a and the hollow portion 31b. The abutting compression coil spring 36 urges the detent pin 33 rearward in the axial direction of the spindle, that is, in the projecting direction. When the taper shank 3 is inserted into the spindle, the detent pin 33 is rotated. The tip is adapted to be engaged with a fixed portion of the machining center, for example, an engaging recess 40a of the rotation preventing block 40 on the tip surface of the spindle head. When the tip of the rotation stop pin 33 and the engagement recess 40a of the rotation prevention block 40 are engaged, the cutting (grinding) coolant supply hole 40b opened in the engagement recess 40a of the rotation prevention block 40. It is designed to connect and communicate with the central hole 33b of the rotation stop pin 33.

The coil spring 37 fitted on the outer periphery of the protruding portion of the detent pin 33 is engaged with both ends of the retaining ring 38 and the engaging claw arm 35 at the protruding end of the detent pin 33.

The operation of the tool adapter with a built-in planetary roller speed increasing mechanism will be described. The collet chuck 27 at the tip of the rotary shaft 25 holds the shank of the predetermined tool T in the tapered hole, so that the tool T is held by the tool adapter with the planetary roller speed-up mechanism. At that time, as shown in FIG. 2 (A), the engaging claw arm 35 is urged by the spring force in the extension direction of the coil spring 37 (projection direction of the rotation stop pin 33), so that the front end surface of the grooved collar portion 2 is urged. The rotary portion A and the fixed portion B are in a fixed relationship with each other, and the key groove 16 and the tool T are maintained in a predetermined rotational relative positional relationship. At this time, the detent pin 33 is in a state of maximally protruding from the hollow portion 31b of the guide cylinder 31 by the spring force of the compression coil spring 36.

This tool adapter with a built-in planetary roller speed-up mechanism, which has been mounted on the tool, is stored in a tool magazine of a machining center, for example, and the annular groove 15 of the grooved collar portion 2 is gripped by a replacement hand so that the spindle of the machining center can be held. Are mounted in a predetermined angular positional relationship. That is, the key of the main shaft is engaged with the key groove 16 and the taper shank 3 is inserted into the taper hole of the main shaft. Is pulled into the taper hole by screwing and rotating, and the tool adapter with the planetary roller speed-up mechanism is fixed to the spindle.

At that time, as shown in FIG. 2 (B), the tool adapter with the planetary roller speed-up mechanism retracts toward the spindle head side, so that the tip of the detent pin 33 is a detent block on the tip surface of the spindle head. The detent pin 33 engages with the engagement recess 40a of the lock 40, retracts into the hollow portion 31b of the guide cylinder 31 against the spring force of the compression coil spring 36, and the engagement claw arm 35 stops. It is pushed until it comes into contact with the end surface of the guide cylinder 31 via the link 37 and the coil spring 37, is separated from the positioning recess 34, and is held by the coil spring 37 which is compressed. As a result, the fixed portion B, that is, the hollow housing 22 is fixed to the spindle head, and the rotating portion A is rotatable with respect to the fixed portion B together with the spindle.

Thus, when the spindle equipped with the tool adapter with the planetary roller speed-up mechanism is rotationally driven, the hollow shaft portion 1 rotates with respect to the hollow housing 22. Therefore, each planet roller 6 makes contact with the ring-shaped fixed raceway surface 18 and rolls, revolves around the spindle axis and rotates about the drive pin 7. Then, the sun roller portion 26 in contact with the planetary roller 6, that is, the tool T mounted on the rotating shaft 25, is rotated at a higher speed than the rotation of the rotating portion A, that is, the main shaft. The thrust load on the tool T is supported by the main shaft via the rotating shaft 25, the ball bearings 24, 24 and the rotating portion A.

Cutting (grinding) is performed by the tool T that rotates at a high speed. At that time, the cutting (grinding) coolant is supplied through the supply hole 40b of the whirl-stop block 40 and the center hole 33b of the whirl-stop pin 33. , The hollow portion 31b of the guide cylinder 31, the communicating hole 31c in the leg portion 31a, and the through hole 23a of the jacket cover 23 to send to the jacket groove 17 to cool the planetary speed increasing mechanism and further through the through hole 21. It is sent toward the jet port 20 and is jetted from there to the processing point.

In this way, the cutting (grinding) coolant splash during machining enters the inside of the tool adapter with the planetary speed increasing mechanism during the low speed rotation while the V-shaped seals 12 and 13 and the V-shaped seal 14 are inserted. In order to prevent frictional heat during high-speed rotation, the lip of each V-shaped seal bends due to centrifugal force and separates from the close contact point, but is blocked by the labyrinth seal part.

The rotary tool adapter in the above embodiment is a rotary tool adapter having a planetary speed increasing mechanism built-in, but a rotary tool adapter in which the rotary portion A and the tool mounting portion C are integrally coupled may be used.

[0029]

[Effect of the device]

 The position of the fixed side engaged part of the machine tool in the axial direction with which the detent pin of the rotary tool adapter engages varies depending on the manufacturer or model of the machine tool. The mechanism can automatically and appropriately correspond to the axial position of the tip of the detent pin with a simple structure. Therefore, there is no need for special position adjusting means having a complicated structure such as the detent mechanism of the related art, and the operator does not have to operate the position adjusting means.

[Brief description of drawings]

FIG. 1 is a front view, partially in section, of a tool adapter with a planetary speed increasing mechanism equipped with a detent mechanism according to an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the rotation stopping mechanism of the rotary tool adapter according to the embodiment of the present invention.

[Explanation of symbols]

 1 Hollow shaft 2 Groove with groove 3 Taper shank 4 Center hole 5 Insertion hole 6 Planetary roller 7 Drive pin 8 Needle roller bearing 9,10 Ball bearing 11 Cap-shaped member 12, 13, 14 V-shaped seal 15 Annular Groove 16 Key groove 17 Jacket groove 18 Ring-shaped fixed raceway surface 19, 28 Labyrinth seal part 20 Cutting (grinding) coolant jet 21 Through hole 22 Hollow housing 23 Jacket cover 23a Through hole 24 Ball bearing 25 Rotating shaft 26 Sun roller part 27 Collet chuck 30 Detent device 31 Guide cylinder 31a Leg 31b Hollow part 31c Communication hole 32 O ring 33 Detent pin 33a Step 33b Center hole 34 Positioning recess 35 Engaging claw arm 35a Tip 36 Compression coil spring 37 Coil spring 38 Stop ring 40 Anti-rotation block 40a Engagement recess 40b Supply hole A Rotating part B Fixed part C Tool mounting part

Front page continued (72) Inventor Toshiaki Oku, 3-5-8 Minamisenba, Chuo-ku, Osaka, Koyo Seiko Co., Ltd. Within

Claims (1)

[Scope of utility model registration request] 1. A hollow housing which is engaged with and disengaged from a fixed side of a machine tool, a rotary unit which is rotatably inserted and supported in the hollow housing, and which is mounted on a main shaft of a machine tool, and directly on the rotary unit. An axial guide cylinder fixed to a hollow housing of a rotary tool adapter having a tool mounting portion that is coupled or rotationally engaged, and slidably fitted in the guide cylinder and fixed to a fixed side of a machine tool. A detent tip whose coupling / disengageable tip protrudes in the main axis direction, elastic means for urging the detent pin in the projecting direction, and an elastically slidable attachment in the axial direction to the detent pin, formed on the rotating part. Rotation tool adapter rotation stop mechanism composed of engaging claw arms that can be engaged and disengaged with the positioning part