JPH0624838U - Rotation tool adapter rotation prevention mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] To enable a rotation stop pin of a rotary tool adapter with various axial positions to automatically engage correspondingly with a fixed side engaged portion. With the goal. A rotation tool adapter rotation preventing mechanism includes a hollow housing 22, a rotating portion A that is rotatably inserted and supported in the hollow housing, and is mounted on a main shaft of a machine tool. An axial guide cylinder 31 fixed to a hollow housing of a rotary tool adapter having a tool mounting portion C to be fitted, and slidably fitted in the guide cylinder and engageable with and disengageable from a fixed side of a machine tool. Is attached to the guide cylinder so as to be elastically extendable and retractable in a direction perpendicular to the main axis direction, and the stop pins are cam-engaged 33c and 35c. An engaging claw arm 35 that can be engaged with and disengaged from a positioning portion 34 formed on the rotating portion by extension and retraction of the rotation stop pin.

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 rotating part is inserted into the main shaft of a machine tool, a rotating part is composed of a fixed part such as a spindle head that is engaged with and disengaged from a fixed side, and a tool mounting part for mounting a tool. The rotation stopping mechanism in the tool adapter is, for example, as 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 of the tip of the movable pin (rotation stop) can be adjusted accordingly. A means for adjusting the relative protrusion amount with respect to the member) is provided.

[0004]

[Problems to be solved by the device]

 The position in the axial direction 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 technology, 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 a means for adjusting the position of the tip of the anti-rotation pin in the axial direction, and moreover, the operator has to make the adjustment each time, which is inconvenient. Therefore, an object of the present invention is to enable a detent pin having various axial positions in a detent mechanism of a rotary tool adapter to be automatically and correspondingly engaged with a fixed side engaged portion. To do.

[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 in 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. The tip of the detent that engages and disengages with the fixed side of the machine tool protrudes in the main axis direction, the elastic means that urges the anti-rotation pin in the protruding direction, and the guide cylinder elastically vertically in the main axis direction. Engagement claw that is mounted so that it can be extended and retracted, is engaged with the anti-rotation pin by a cam, and engages and disengages itself with the positioning part that is formed on the rotating part due to the extension and retraction of the anti-rotation pin. It is composed of a.

[0007]

[Action]

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

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 a main shaft 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.

When mounted on the spindle, the rotary tool adapter retracts to the fixed side of the machine tool, for example, the spindle head side, so that the tip of the detent pin engages the fixed side of the machine tool, for example, the tip surface of the spindle head. Engaging the part, the detent pin retracts into the guide cylinder against the spring force of the elastic means. At that time, the engaging claw arm that is cam-engaged with the rotation stopping pin retracts and is maintained in a state of being disengaged from the engagement with the positioning portion of the rotating portion.

Therefore, the hollow housing is fixed to the spindle head, and the rotating portion and the tool mounting portion are rotatable with respect to the hollow housing, that is, the spindle head. 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.

[0011]

【Example】

 An embodiment of this 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, a hollow shaft portion 1 at the tip, a flanged portion 2 at the middle, and a 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 part B is rotatably supported by the ball bearings 9 and 10 on the fixed part A, and the inner rings of the ball bearings 9 and 10 are fitted at both ends of the insertion hole 5. .

Further, a labyrinth seal formed in a flange 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 on 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 end surface of the hollow shaft portion 1 adjacent to the labyrinth seal portion of the end hole of the cap 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 changing device, and the latter is engaged with a main shaft key. A pull rod of the main shaft of the 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 formed on the outer peripheral surface of the intermediate portion, a ring-shaped fixed raceway surface 18 for planetary rollers is formed on the inner peripheral surface of the intermediate portion, and further, lip portions of the V-shaped seals 12 and 13 are formed on the inner peripheral surfaces of both ends. The closely projecting edges are formed respectively, and the labyrinth seal portion 19 is formed between the rear end surface and the grooved flange portion 2. Further, from the jacket groove 17 to the cutting (grinding) coolant injection port 20 on the front end surface. It is composed of a hollow housing 22 having a substantially cylindrical shape having a through hole 21 penetrating therethrough, and a jacket cover 23 covering the jacket groove 17 is fitted on the outer peripheral surface thereof.

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 fixed raceway surface 18 on the front and rear sides thereof, and the V The lips of the V-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 rotating shaft 25 rotatably inserted in the center hole 4 of the hollow shaft portion 1 via ball bearings 24, 24, and its rear end portion is connected to the sun roller portion 26. A collet chuck 27, which is circumscribed by the planetary roller 6 and has a tip portion protruding from the tip hole of the cap-shaped member 11 of the rotating portion A and holding the shank of the tool T 1, is provided. Thus, a flange-shaped labyrinth seal portion 28 is formed in the engaging 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 in close contact with the labyrinth seal portion. ing. 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 leg portions 31a protruding radially from the outer peripheral surface, and a guide cylinder 31. An O-ring 32 keeps the oil-tight inside and is slidably fitted into the guide cylinder 31, and a rotation-preventing pin 33 having a tip protruding rearward, and a guide cylinder 31 which can be projected and retracted in the radial direction. Reference numeral 35a is composed of an engaging claw arm 35 which can be freely engaged with and disengaged from a positioning recess 34 formed in the front end surface of the grooved collar portion 2.

The guide cylinder 31 is opened only on the rear end face, and a hollow portion 31b having a step portion 31d is formed, and a 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 whirl-stop pin 33 has a stepped portion 33a on the tip side and a central hole 33b which is an opening at both ends, and a V-shaped groove 33c having a sloping surface at the intermediate portion on the outer peripheral surface. Is a tubular body in which locking grooves in which locking rings 37 are fitted are respectively formed, and the center hole 33b of the detent pin 33 fitted in the hollow portion 31b of the guide cylinder 31 has a step. A compression coil spring 36 is fitted between the portion 33a and the bottom surface of the hollow portion 31b. The compression coil spring 36 urges the detent pin 33 rearward in the main shaft axis direction, that is, in the protruding direction until the locking ring 34 engages with the stepped portion 31d of the hollow portion 31b.

Then, when the taper shank 3 is inserted into the spindle, the tip of the detent pin 33 is engaged with a fixed portion of the machining center, for example, the engaging recess 40 a of the detent block 40 on the tip surface of the spindle head. It is like this. 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 is prevented from rotating. The central hole 33b of the pin 33 is connected and communicated.

The engaging claw arm 35 is a plate-shaped frame body in which a part of the outer circumference thereof projects to become an engaging claw portion 35a, and a substantially rectangular opening 35b into which the rotation stopping pin 33 can be inserted. The peripheral edge of the opening 35b is a wedge-shaped edge portion 35c that is engaged with the V groove 33c of the detent pin 33 at least in the area opposite to the engaging claw portion 35a. The engaging claw arm 35 is inserted into a slit 31e penetrating the intermediate portion of the guide cylinder 31 in the diametrical direction, and the rotation stop pin 33 in the hollow portion 31b is inserted into the opening 35b. The V groove 33c of the detent pin 33, which is projected until 37 is engaged with the stepped portion 31d of the hollow portion 31b, that is, the maximum protruding state, is exactly opposite to the slit 31e, that is, the peripheral edge of the opening 35b of the engaging claw arm 35. It is in a position to

Between the one surface of the engaging pawl arm 35 on the engaging pawl portion 35a side and the outer peripheral surface of the leg portion 31a of the guide cylinder 31, the engaging pawl arm 35 is opened by the leaf spring 38 engaged with both. Until the wedge-shaped edge portion 35c of the hole 35b engages with the V groove 33c of the detent pin 33, the engaging claw portion 35a is biased to the protruding state. Then, the engaging claw portion 35a in the protruding state engages with the positioning recess 34 formed on the front end surface of the grooved collar portion 2.

The operation of the tool adapter with the 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. In this state, as shown in FIG. 2 (A), the engaging claw arm 35 expands due to the biasing of the compression coil spring 38 in the expanding direction (projecting direction of the engaging claw arm 35) to engage the engaging claw arm 35. The claw portion 35a is engaged with the positioning concave portion 34 formed on the front end surface of the grooved collar portion 2, the rotating portion A and the fixed portion B are in a fixed relationship, and the key groove 16 and the tool T have a predetermined rotating direction. The relative positional relationship is maintained. At this time, the detent pin 33 is in a state of being protruded rearward from the hollow portion 31b of the guide cylinder 31 in the axial direction of the spindle, that is, in the protruding direction by the spring force of the compression coil spring 36.

The tool adapter with the built-in planetary roller speed-up mechanism already mounted on the tool is stored in, for example, a tool magazine of a machining center, 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, the taper shank 3 is inserted into the taper hole of the main shaft, and for example, the pull rod of the main shaft of the machining center is inserted into the screw hole formed in the rear end surface of the taper shank 3. The screw is pulled into the tapered hole by screwing, and the tool adapter with the planetary roller speed-up mechanism is fixed to the spindle.

In this state, as shown in FIG. 2B, 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 rotates around the tip surface of the spindle head. By engaging with the engaging recess 40a of the stop block 40, the detent pin 33 retracts into the hollow portion 31b of the guide cylinder 31 against the spring force of the compression coil spring 36. At this time, the wedge-shaped edge portion 35c of the engaging claw arm 35 slides on the sloping surface of the V groove 33c of the detent pin 33 and is disengaged from the engagement with the V groove 33c, and the wedge-shaped edge portion 35c becomes the detent pin 33. Will be engaged with the outer peripheral surface of.

As a result, the engaging pawl arm 35 retracts against the spring force of the compression coil spring 38, and the engaging pawl portion 35 a forms a positioning recess 34 formed on the front end surface of the grooved collar portion 2. It is maintained in the disengaged state. Therefore, 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 built-in 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 this time, the cutting (grinding) coolant is supplied through the supply hole 40b of the rotation stop block 40 and the center hole 33b of the rotation stop pin 33. It is sent to the jacket groove 17 through the hollow portion 31b of the guide cylinder 31, the communication hole 31c in the leg portion 31a, and the through hole 23a of the jacket cover 23 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.

Although the rotary tool adapter in the above-described embodiment is a rotary tool adapter having a planetary speed increasing mechanism built therein, it may be a rotary tool adapter in which the rotating portion A and the tool mounting portion C are integrally connected.

[0032]

[Effect of device]

 Although the position of the fixed side engaged part of the machine tool in the axial direction in which the detent pin of the rotary tool adapter engages varies depending on the manufacturer or model of the machine tool, there are various positions. 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 prior art, and the operator does not have to worry about operating the position adjusting means.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view of a planetary speed increasing mechanism built-in tool adapter having a rotation stopping 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.

FIG. 3 is an operation explanatory view of the rotation stopping mechanism of the rotary tool adapter according to the embodiment of the present invention.

FIG. 4 is a bottom view of the rotation stopping mechanism of the rotary tool adapter according to the embodiment of the present invention.

5 is a cross-sectional view taken along the line VV of FIG.

[Explanation of symbols]

1 Hollow shaft 2 Groove with groove 3 Tapered 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 31d, 33a Step 31e Slit 32 O-ring 33 Detent pin 33b Center hole 33c V groove 34 Positioning recess 35 Engaging claw Arm 35a Engaging claw 35b Opening 35c Wedge edge 36 Compression coil spring 37 Locking ring 38 Leaf spring 40 Non-rotating block 40a Engagement recess 40b Supply hole A Rotating part B Fixing part C Tool mounting part

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A hollow housing which is engaged with and disengaged from a fixed side of a machine tool, a rotary portion which is rotatably inserted in the hollow housing and mounted on a spindle of a machine tool, and a rotary portion which is directly attached to the rotary portion. In a rotary tool adapter having a tool mounting portion which is coupled or rotationally engaged, an axial guide cylinder fixed to a hollow housing and a guide cylinder slidably fitted in the guide cylinder and fixed to a fixed side of a machine tool. A locking pin with a freely disengageable tip protruding in the main axis direction,
The elastic means for urging the anti-rotation pin in the protruding direction is elastically attached to the guide cylinder perpendicularly to the main axis direction so that the anti-rotation pin can be extended and retracted, and the anti-rotation pin is cam-engaged. A rotation stopping mechanism for a rotary tool adapter, which comprises an engaging claw arm that is engageable and disengageable with a positioning portion formed on the.