JPH074758B2 - Honing attachment - Google Patents

Description

TECHNICAL FIELD The present invention relates to a honing attachment which can be incorporated into a machining center body to perform honing processing.

(Prior Art) Conventionally, a machining center that enables attachment of cutting processing such as milling, drilling, tapping, and boring to one machine tool so that various cutting operations can be performed efficiently, The machining center is equipped with a grinding function that can process special shapes such as flat surfaces, side surfaces, bottom surfaces, grooves, inner surfaces, and pockets.
A gliding center was known that enabled not only various cutting but also grinding. However, so far, no proposal has been made for a honing attachment that can add a honing function to these centers.

(Problems to be Solved by the Invention) In the technology described in the related art, even if various cutting processes and grinding processes can be performed by one machining center or a gliding center, honing is performed by these centers. Because I can't
When it was necessary to perform honing processing on the work, it was necessary to prepare a honing machine separately from the above-mentioned centers.

However, if the honing machine is separately prepared, there is a problem that not only a large amount of money is required to purchase the honing machine, but also a space required for the installation is widened and a machining cost of the work becomes expensive.

SUMMARY OF THE INVENTION The present invention has an object of providing a honing attachment which can be mounted on a machining center in order to solve the problems of the conventional art.

(Means for Solving the Problems) In order to achieve the above object, in the honing attachment according to the present invention, the drive shaft has a threaded portion formed at one end and is attachable / detachable to / from the rotation transmitting member in the machining center body at the other end. A bracket having a bulging tip end and a conical surface formed on the outer periphery is detachably attached to one end of the main shaft by the drive shaft that is inserted through the inside and screwed into the main shaft, and the other end is a grindstone. The main shaft connected to the horn head is provided with guide grooves in the length direction of the main shaft at both ends in the radial direction of the part where the hollow hole is provided, and is housed in the sleeve externally inserted into the main shaft and the hollow hole of the main shaft. What is a pressing member?
The sleeve is integrally connected by a connecting pin that passes through the pair of guide grooves, and the sleeve has a screw formed on the lower outer circumference, and an outer tooth on a part of the upper outer circumference, and an operating member having an arm on the other part. A crown-shaped bearing holder that is rotatably mounted and has external teeth formed on its outer periphery is screwed into the lower threaded portion of the operating member, and the operating member and the bearing holder that is screwed into the operating member rotate the arm of the operating member. The outer teeth of the operating member and the bearing holder are stored in an outer cylinder that has a permissible opening and can be divided into upper and lower parts, except for the lower end coronal part. The grinding wheel adjusting dial, which is rotatably locked by the biasing member that presses toward the teeth and adjusts the amount of the grinding wheel pushed out, is integrally connected to the crown portion of the bearing holder and is rotatable with respect to the outer cylinder. Is held by the arm tip of the operating member The vertical engaging shaft projecting from the above is engaged with a coupling member on the side surface of the gear that is rotated around the drive shaft by a motor attached to the machining center, and the upper end surface of the outer cylinder engages with the engaging hole of the machining center body. In addition, a detent shaft for locking the outer cylinder so as not to rotate is provided.

When it is desired to make the inside of the outer cylinder less visible and to improve the view, an opening cover having a notch slightly larger than the width of the arm of the actuating member is rotatably slidably provided inside the opening of the outer cylinder. Preferably.

(Operation) When the drive shaft of the honing attachment is installed in the attachment mounting hole of the machining center body, the conical surface formed on the outer circumference of the bracket of the attachment is attached to the conical surface inside the machining center body by the rotation transmission member that grips the bulge of the tip of the drive shaft. The rotation on the machining center side is transmitted to the grindstone via the main shaft by the bracket pressed by the rotation transmitting member and coupled with the rotation transmitting member. Moreover, since the machining center body is configured to move up and down with operation, when operating with the attachment attached, the grindstone mounted on the horn head of the attachment moves up and down by the machining center body in addition to the above-mentioned rotational movement. Exercise is superimposed.

In addition, the vertical engaging shaft provided at the tip of the arm of the attachment and the detent shaft provided on the upper surface of the outer cylinder are engaged with the connecting member and the locking hole of the gear held at the machining center, respectively. Therefore, due to the rotation of the gear in the set direction, the operating member screwed onto the inner surface of the bearing holder and the horn head linked to this are moved downward, and the grindstone attached to the horn head is pressed against the inner surface of the work. It Therefore, the honing attachment attached to the main body of the machining center performs honing processing on the work by performing vertical reciprocating motion and rotary motion while being pressed against the inner surface of the work.

Further, when the grindstone attached to the horn head is worn, when the grindstone adjusting dial of the stopped device is rotated in the pushing direction of the grindstone, the operating member is rotated by the rotation of the bearing holder screwed to the stationary operating member. And the horn head are moved downward to push the grindstone outward, so that the surface of the worn grindstone is adjusted to the same position as before the wear.

(Example) An example will be described with reference to the drawings.

In the figure, 1 is a machining center (hereinafter abbreviated as MC) where a honing attachment is attached.
A main body is shown, and a hollow spindle (rotation transmitting member) 4 rotatably held by ball bearings 2 and 3 is inserted into a mounting portion of the honing attachment of the MC main body 1. The spindle 4 has a conical hole 5 formed in the lower end opening, and a pull-up chuck claw 7 that is movable in the axial direction of the spindle 4 is housed in a hollow hole 6 above the spindle hole. The joining space portion 8 has a diameter larger than that of the joining space portion 6. A plurality of split grooves 7b are formed in the tip grip portion 7a of the lifting chuck claw 7 so that it can be elastically deformed in the radial direction.

The inner ring of the ball bearing 2 is held by the flange step portion of the spindle 4, and the outer ring is pressed by the bearing retainer 9 fixed to the CM body 1. The spindle 4 is provided outside the bearing retainer 9.
The driven gear 12 rotated about the same axis as the ball bearing 13
It is rotatably held by the MC body 1 via the. The driven gear 12 meshes with the drive gear 11 fixed to the motor shaft of the motor 10 mounted on the side surface of the MC body 1 and is rotated in the forward and reverse directions. Reference numeral 14 is a connecting member having an engagement hole 15 fixed to the side surface of the driven gear 12, and the bearing retainer 9 is provided with a locking hole 16 used to engage the upper outer cylinder 23 so as not to rotate. ing.

On the other hand, for the honing attachment, the MC body 1
In order to be able to receive the rotational force transmitted from the spindle 4 when it is mounted on the spindle 4, an engaging means (not shown) that is keyed to the lower end surface of the spindle 4 is provided, and the spindle 4 The outer surface of the bracket 17 inserted into the conical hole 5 at the lower end opening of the bracket 17 is formed with a conical surface 18 capable of making surface contact with the conical hole 5, and at the upper end of the drive shaft 19 inserted into this bracket 17, A coupling bulge 20 is provided that is engaged with and gripped by the lifting chuck claw 7.

The drive shaft 19 has a threaded portion 21 formed on the lower end located in the through hole of the bracket 17, and this male threaded portion 21 is
The bracket 17 is screwed with the upper end of the main shaft 22 having a hollow hole that fits into the boss 17a of the 17, and the bracket 17 is fixed between the flange 22a of the main shaft 22 and the flange 19a of the drive shaft 19. The boss portion 17a of the bracket 17 is attached to the upper end surface of the upper outer cylinder 23, and is rotatably held with respect to the upper outer cylinder 23 by a ball bearing 24 that receives the inner ring by the flange portion 22a of the main shaft 22. There is. Reference numeral 17b is a gripping portion of the bracket 17.

The spindle 22 provided with a hollow hole is provided with a pair of guide grooves 22b, 22b in the longitudinal direction of the spindle 22 at corresponding positions on both ends in the radial direction below the flange portion 22a. A sleeve 25 is fitted to the outer periphery of the main shaft 22 below the flange portion 22a so as to cover the guide grooves 22b, 22b.
The pressing member 26 housed in the hollow hole of the main shaft 22 and the guide groove 22.
They are integrally connected by a connecting pin 27 that passes through b and 22b. Reference numeral 28 denotes a compound ball bearing (a needle roller bearing with a ball bearing may be attached) attached to the outer periphery of the sleeve 25. The operating member 29 integrally moves up and down with the sleeve 25 on the outside of the sleeve 25 through the compound ball bearing 28. It is mounted so that it can move.

The actuating member 29 includes a plurality of outer teeth 29 at a part of the outer periphery of the upper end.
a is formed, and an arm 29b protruding outward from an opening 23a provided over a certain range of the peripheral side surface of the upper outer cylinder 23 is provided on the other portion of the upper end outer peripheral portion, and these outer teeth 29a and the arm 29b are provided. A threaded portion 29c is formed at the lower end of the.

Between the adjacent outer teeth 29a, 29a of the operating member 29, the upper outer cylinder 2
Depending on whether the steel ball 31 in the ball plunger attached to 3 is pressed by the biasing member 30 and the rotational moment acting on the operating member 29 is larger or smaller than the rotational moment determined by the pressing force of the steel ball 31, The actuating member 29 is allowed or blocked from rotating. Steel ball for actuating member 29
The pressing force of 31 is adjusted, for example, by rotating the adjusting screw member 32 coupled to the ball plunger.

Reference numeral 33 denotes a crown-shaped bearing holder having outer teeth 33a provided on the outer peripheral portion, and the male screw portion 29 of the operating member 29 is provided on the inner surface of the opening on the upper end side thereof.
A female screw portion 33b that is screwed with c is formed. The outer teeth 33a portion of the bearing holder 33 is fitted in an annular recessed hole formed in the joint surface between the upper outer cylinder 23 and the lower outer cylinder 23 ', and the adjacent outer teeth 33a of the bearing holder 33, Between 33a, lower outer cylinder 2
Depending on whether the steel ball 34 in the ball plunger attached to 3'is pressed by the biasing member 35 and the rotational moment acting on the bearing holder 33 is larger or smaller than the rotational moment determined by the pressing force of the steel ball 34. The bearing holder 33 is allowed or prevented from rotating. The upper outer cylinder 23 and the lower outer cylinder 23 ', which are vertically separable, have their joint flange portions integrally joined by a plurality of screws 36.

The crown-shaped bearing holder 33 rotatably holds the lower end of the main shaft 22 by means of a bearing 37 mounted in a circular opening in the center of the end face. In the crown portion of the bearing holder 33 protruding from the lower end surface of the lower outer cylinder 23 ', a grindstone attached to the horn head 38 is provided.
A grindstone adjusting dial 40 for adjusting the pushing amount of 39 is fitted. This dial 40 is fixed to the end surface of the bearing holder 33 with a plurality of screws 41,
It is rotatable with respect to the upper outer cylinder 23 together with 33.
Reference numeral 42 denotes a knurled portion for slip prevention provided on the grip portion of the dial 40, and a grindstone when the dial 40 is rotated on the peripheral surface of the dial 40 on the side contacting the lower end surface of the lower outer cylinder 23 '.
A scale 43 indicating the amount of advance / retreat of 39 is engraved.

A mounting portion of an adapter 44 having a through hole is inserted into a lower end opening communicating with the hollow hole of the main shaft 22, and the adapter 44 is fixed to the main shaft 22 with a screw 45 and a positioning member 46. The horn head 38 that passes through the adapter 44 is attached to the adapter 44. The horn head 38 is a connecting rod 47 of a grindstone expanding mechanism that projects downward from the adapter 44.
And a transmission member 48 pivotally attached to the upper end of the connecting rod 47 and protruding into the hollow hole of the main shaft 22.

At the tip of the connecting rod 47, an inclined surface 47 that tapers toward the lower end
A is formed, and a grindstone base 49 having a grindstone 39 fixed to the upper surface of the inclined surface 47a is pressed by a spring (not shown). On the other hand, the transmission member 48 projecting into the hollow hole of the main shaft 22 is attached to the upper end of the disk-shaped spring receiving seat 50 so as not to come off.
The upper end surface of the transmission member 48 is constantly pressed against the lower end surface of the pressing member 26 housed in the main shaft 22 by the coil spring 51 mounted between the hollow hole in the mounting portion of 44. Therefore, the up-and-down movement of the operating member 29 is transmitted to the connecting rod 47 of the whetstone expanding mechanism via the pivotal connecting portion between the transmitting member 48 and the connecting rod 47.

A vertical engagement shaft 52, whose upper end is inserted into an engagement hole 15 of a connecting member 14 fixed to the driven gear 12, is fixed to the tip of the arm 29b protruding to the outside of the upper outer cylinder 23. An opening cover 54 having a notch for inserting the arm 29b to the outside is held inside the upper outer cylinder 23 so as to be rotatable and slidable in a circular annular recess formed on the upper end surface of the bearing holder 33. When the actuating member 29 is rotated in the forward and reverse directions by the driven gear 12 via the arm 29b, the arm 29b pushes the cutout side edge portion and is rotated in the forward and reverse directions.
By 54, the inside cannot be seen from the outside through the opening 23a of the upper outer cylinder 23 to improve the appearance.

An arm 23b protruding horizontally from the outer peripheral portion is provided at the upper end of the upper outer cylinder 23. At the tip of this arm 23b, the upper end portion is provided with a cutout for rotation prevention provided in the bearing retainer 9. , Or a detent shaft 53 that engages with the locking hole 16 such as an opening is fixed.

Next, the operation of the device will be described.

In the MC main body 1 before the honing attachment is mounted, the tip grip portion 7a of the lifting chuck claw 7 is pushed down to the position of the joining space portion 8 in the spindle 4 by the preset program, and the hollow hole 6 It is in a state where it spreads out more than when it is located at.

When mounting the honing attachment to the MC body 1, the grip 17b of the bracket 17 is gripped to make the vertical engagement shaft 52 fixed to the tip of the arm 29b correspond to the engagement hole 15 of the coupling member 14, and The detent shaft 53 fixed to the arm 23b of the outer cylinder 23 is made to correspond to the locking hole 16 of the bearing retainer 9 on the MC main body 1 side, and the bracket 17 is connected to the drive shaft 19 so that the coupling bulge 20 is a hollow hole of the spindle 4. Insert up to the fixed position located in 6.

Then, when the chuck claw 7 is moved upward by a pulling command to the chuck claw 7, the tip gripping part 7a of the chuck claw 7 located in the bonding space 8 is hollow in the spindle 4 having a diameter smaller than that of the bonding space 8. Split groove when moved into hole 6
The portion 7b is elastically deformed inward in the radial direction to grip the coupling bulge 20 of the drive shaft 19, the bracket 17 is keyed to the lower end surface of the spindle 4, and the conical surface 18 of the bracket 17 is the spindle. 4 to the position where it is pressed by the conical hole 5
In order to move the honing attachment upward, the honing attachment is positioned by the bracket 17 and joined to the MC body 1.

When the operation switch of the MC body 1 is turned on after the mounting of the honing attachment is completed, the MC body 1 rotates the spindle 4 while reciprocating in the vertical direction.
The honing attachment, which is connected to the MC body 1 via 17 and the connecting bulge 20 of the drive shaft 19 is held by the chuck claw 7, is connected to the horn head 38 via the main shaft 22 connected to the drive shaft 19. While rotating the grindstone 39 attached to, the vertical reciprocating motion is performed.

Simultaneously with the above movement of the grindstone 39, the driven gear 12 and the connecting member 14 fixed to the driven gear 12 are rotated by the drive gear 11 attached to the motor 10 in the direction of moving the operating member 29 downward.
The rotation of the driven gear 12 is transmitted to the operating member 29 by the vertical engagement shaft 52 connecting the connecting member 14 and the arm 29b, and the operating member 29 is rotated in the same direction as the driven gear 12.

However, the bearing holder screwed with the actuating member 29
33 is held by a steel ball 34 and a biasing member 35 so as not to rotate, in a lower outer cylinder 23 'that is locked to the MC body 1 via an upper outer cylinder 23 by a rotation stop shaft 53. , Driven gear
The actuating member 29 rotated by 12 is moved toward the bearing holder 33 together with the inserted composite ball bearing 28 and sleeve 25. Moreover, in this movement, the vertical engagement shaft 52 causes the connecting member 14 to move.
Since it is carried out with the engaging hole 15 of the
Even when the arm 29b of 29 moves from the position indicated by the solid line to the position indicated by the chain double-dashed line, the engagement between the vertical engagement shaft 52 and the connecting member 14 is not released.

At the time of the above movement, the pressing member 26 coupled to the sleeve 25 by the connecting pin 27 moves downward in the hollow hole of the main shaft 22 and pushes the upper end of the transmission member 48 downward against the biasing force of the coil spring 51. Therefore, the connecting rod 47 pivotally attached to the lower end of the transmitting member 48 is also moved in the same direction, and the whetstone 39 attached to the whetstone base 49 is the whetstone base 4 that is pressed against the inclined surface 47a of the connecting rod 47.
It is extruded in the radial direction of the connecting rod 47 via 9 and is pressed against the inner surface of the work to be polished by the grindstone 39.

Therefore, the honing attachment mounted on the MC main body 1 causes the grindstone 39 to perform the rotational movement and the vertical reciprocating movement while the grindstone 39 is pressed against the inner surface of the work, thereby performing the honing processing on the work.

When the honing of the work is completed, the motor 10 is rotated in the reverse direction, and the operating member 29 screwed to the bearing holder 33 is moved upward together with the pressing member 26. At this time, the urging force of the coil spring 51 acting on the spring seat 50 causes the transmission member 48 to move upward with the upper end in contact with the lower end of the pressing member 26, and the connecting rod pivotally attached to the transmission member 48. Move 47 up. Therefore, the grindstone 39 pressed against the inclined surface 47a of the connecting rod 47 via the grindstone base 49 is retracted inward in the radial direction of the connecting rod 47, and the surface of the grindstone 39 is separated from the work surface of the workpiece.

Simultaneously with the reverse rotation of the motor 10, the MC main body 1 is also moved up to the original position before machining and stopped at that position by a preset program, but this operation causes the grindstone 39 to separate from the machining surface of the workpiece. Since it is carried out in the state of being honed, the grinding surface after the honing process is not damaged by the grindstone 39.

When the surface of the grindstone 39 is abraded by the honing process, the grinding wheel adjusting dial 40 is rotated in the pushing direction of the grindstone 39 while the MC body 1 is stopped. The holder 33 is rotated in the same direction as the dial 40 while receiving a clip stop action by the steel ball 34 and the biasing member 35.

However, the bearing holder 33 is held by the upper outer cylinder 23 and the lower outer cylinder 23 'so that it cannot move in the vertical direction, and the operating member 29 screwed with the bearing holder 33 is stopped by the vertical engagement shaft 52. Connecting member 14 of driven gear 12
The rotation of the dial 40 causes the operation member 29 screwed with the bearing holder 33 to rotate.
Is moved downward along the guide grooves 22b, 22b of the main shaft 22,
The grindstone 39 is pushed out in the radial direction of the connecting rod 47 as in the case of the above description.

Therefore, when the whetstone adjusting dial 40 is rotated by an appropriate angle with reference to the scale 43, the surface of the whetstone 39 after wear is pushed out to the same position as the surface of the whetstone 39 before wear, and the steel ball 34 and the urging force are applied. The clip stop action of the member 35 allows the grindstone 39 to be held in that position. Therefore, during the honing process, the time until the grindstone 39 comes into contact with the inner surface of the work to start the process is always kept constant, and the honing process can be efficiently performed.

Further, when the honing attachment is removed from the MC body 1, when the grip 17b of the bracket 17 is gripped and the switch is turned on, the honing attachment is positioned in the hollow hole 6 of the spindle 4 according to a preset program. The tip grip portion 7a of the lifting chuck claw 7 is pushed down to the position of the joining space portion 8. When the tip grip portion 7a is moved to the joining space portion 8 which is larger than the diameter of the hollow hole 6, the tip grip portion 7a released from the pressing action by the inner wall of the hollow hole 6 is elastic at the plurality of split grooves 7b. Since it deforms and expands to the outside, the joint bulging portion 20 of the drive shaft 19 is released from the joint by the tip grip portion 7a of the lifting chuck claw 7.

When the honing attachment is moved downward in this state, first, the bracket 17 is released from the key connection with the lower end surface of the spindle 4, and then the detent shaft 53 and the vertical connection shaft 52 are respectively engaged with the bearing retainer 9. Stop hole 16 and connecting member
The engaging holes 15 of 14 are disengaged, and the drive shaft 19
The joint bulging portion 20 at the tip of the is removed from the conical hole 5 of the spindle 4, and the removal of the honing attachment is completed.

(Effects of the Invention) Since the present invention is configured as described above,
The following effects are achieved.

The drive shaft of the honing attachment is provided with a coupling bulge that is connected to the rotation transmission member of the MC body, and the conical surface is formed on the outer peripheral surface of the bracket that holds the drive shaft. The rotation prevention shaft to prevent the above is fixed to the outer cylinder, and the operating member housed in the outer cylinder is rotated by the gear coaxial with the drive shaft held on the MC body side. It is possible to provide a honing attachment that can be easily attached and detached, and that can give the performance of performing honing processing to the MC.

In addition, a whetstone adjustment dial that is connected to the operating member via a bearing holder is provided on the lower end surface of the outer cylinder, and when the machine is stopped, the operating member is moved up and down by the rotation of the dial to wear the whetstone surface after abrasion. Since it can be set again at the same position as the surface of the previous grindstone, the polishing efficiency of honing can be improved.

Further, when the opening cover is slidably provided inside the opening of the outer cylinder, the appearance can be improved so that the inside of the outer cylinder cannot be seen when the operating member is rotated.

[Brief description of drawings]

 The drawings are longitudinal sectional views of an embodiment of the present invention. 1 ... Machining center (MC) main body 7 ... Chuck member (lifting chuck claw) 10 ... Motor, 12 ... (Driven) gear 14 ... Connecting member, 16 ... Locking hole 17 ... Bracket, 18 ... Conical surface 19 ... Drive shaft, 20 … Coupled bulge 21… Male thread, 22… Main shaft 22b… Guide groove, 23,23 ′… Outer cylinder 23a… Opening, 25… Sleeve 26… Pressing member, 27… Connecting pin 29… Operating member, 29a… Outer Tooth 29b… Arm, 29c… Male thread 30,35… Biasing member, 31,34… Steel ball 33… Bearing holder, 33a… External teeth 38… Horn head, 39… Grinding stone 40… Grinding stone adjusting dial 52… Vertical Engaging shaft, 53 ... Detent shaft 54 ... Opening cover

Claims (2)

[Claims] 1. A bracket having a threaded portion formed at one end of the drive shaft, a distal end bulging portion detachable from a rotation transmission member within the machining center body, and a conical surface formed at the outer periphery of the bracket. The drive shaft, which is inserted through the inside and screwed into the main shaft, is detachably attached to one end of the main shaft, and the other end is connected to a horn head equipped with a grindstone. Guide grooves in the length direction of the main shaft are formed at both ends in the direction, and the sleeve externally inserted on the main shaft and the pressing member housed in the hollow hole of the main shaft are integrally connected by a connecting pin that passes through the pair of guide grooves. The sleeve has threads formed on the lower outer circumference, and external teeth are rotatably mounted on a part of the upper outer circumference, and actuating members equipped with arms are rotatably mounted on other parts of the sleeve, and external teeth are formed on the outer circumference. Crowned bearing holder The actuating member and the bearing holder screwed to the lower threaded portion of the moving member have an opening that allows the arm of the actuating member to rotate, and the lower end is inside an outer cylinder that is vertically separable. The outer teeth of the operating member and the bearing holder are housed except for the coronal portion, and are rotatably locked by a steel ball mounted on the outer cylinder and a biasing member that presses the steel ball toward the outer teeth. The whetstone adjusting dial for adjusting the pushing amount of the whetstone is integrally connected to the crown portion of the bearing holder and rotatably held with respect to the outer cylinder, and the vertical engaging shaft projecting from the arm tip of the operating member is , The motor attached to the machining center engages with the coupling member on the side of the gear that is rotated around the drive shaft, and the upper end surface of the outer cylinder engages with the locking hole of the machining center body to prevent the outer cylinder from rotating. Times to lock on Honing attachment, characterized in that the locking shaft. 2. The honing attachment according to claim 1, wherein an opening cover having a notch slightly larger than the width of the arm of the operating member is rotatably slidably provided inside the opening of the outer cylinder.