JPH0435082Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is a crank for determining the angular phase of an eccentric workpiece such as a crankshaft for a small refrigerator and automatically aligning its axis with the axis center of the main shaft. Regarding pin phasing.

Prior art When determining the angle of the crank pin of a small crankshaft, centering is performed by supporting a journal connected to one side of the crank pin with a journal receiver on the chuck body, rotating the crankshaft, and pressing a centering gauge against the outer circumferential surface of the crank pin. The angular phase of the crank pin was determined based on the position of the reference plane of the gauge, and its axis was aligned with the center of rotation of the spindle. Also, as in Japanese Utility Model Publication No. 59-17551, a letter-shaped phasing gauge is fitted around the outer periphery of the crank pin, and one inscribed wall surface of the phasing gauge is used as a reference surface, and the other inscribed wall surface is provided with spring properties. The crank pin is pressed against the reference surface so that its axis coincides with the center of rotation of the spindle.

Problems that the invention aims to solve In the conventional method, the position of the reference plane of the centering gauge is fixed, so the error in the rough-machined outer diameter of the crank pin is taken into account, and the position is adjusted to the crank pin with the smallest machining allowance. This will set the position of the reference plane. For this reason, the depth of cut of the grindstone increases and the machining time increases. Furthermore, when changing gears to a crankshaft with a different crankpin diameter, the position of the reference plane must also be changed. Even in the case of Japanese Utility Model Publication No. 59-17551, an increase in the cutting depth of the grindstone due to an error in the rough cutting outer diameter is unavoidable, and it is also necessary to replace the letter-shaped phasing gauge.

Means for Solving the Problem In a phasing device 5 that eccentrically holds the journal portion Wa of the crankshaft W and aligns the axis of the crank pin portion Wb to be ground with the spindle axis, the phasing device 5 is fitted into the phasing body 6 and is inserted into the main shaft. A sleeve 21 that is slidable in the axial direction by the piston 16 and a gripping claw 45 that is provided on a gripper body 39 that is attached to the tip of the sleeve 21 and fixed via a flange 37 and that abuts the crank pin portion Wb are parallel to each other. A pair of grippers 43 that can be opened and closed, and a compression spring 25 that is inserted into the sleeve 21 and pressed into the sleeve 21 by the child piston 17 that is inserted into the main piston 16 are interposed to push the child piston 17 to the retreating end. A spring core 24 that is movable in the direction is fitted into a sliding shaft 18 that also serves as a piston rod of the child piston 17, and its tip is inserted into the spring core 24 and inserted into the hole of the spring core 24. A push bar 28 is biased to protrude toward the crank pin Wb side by a compression spring 29, a joint shaft 33 is fixed to the tip of the push bar 28 and fitted into the sleeve 21, and a screw thread is attached to the tip of the joint shaft 33. The arm 3 has an arm 34b which is mounted and provided symmetrically in a direction perpendicular to the axis.
A pusher bolt 50 provided on both sides of the pusher 34 contacts the gripper 43 by the movement of the child piston 17 to open and close the gripper 43.
and a pusher 55 that is fitted into the pusher 34 and positioned in the axial direction by coming into contact with the tip of the crank pin Wb by means of a compression spring 57 inserted into the hole of the joint shaft 33; A pair of gripping claws 45 that press the crankshaft against the chuck end face using a pusher 55 to position the crankpin in the axial direction, and at the same time move the outer circumference of the crankpin Wb by an equal amount symmetrically with respect to the axis.
The phase is determined by clamping the two.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings. In a well-known cylindrical grinder, a headstock (not shown) is placed on a table 1, and a main spindle connected to a rotating means is rotatably supported on this headstock, and a chuck 2 is provided at the tip of the main spindle. The chuck 2 is equipped with a pedestal 3 having a V-shaped surface on which the journal Wa portion of the crankshaft of the workpiece W is placed parallel to the axis of the main spindle, and the pedestal 3 is arranged so that the axis of the crank pin portion Wb is the center of rotation of the main spindle. It has a clamping device (not shown) for fixing the workpiece on the pedestal 3. Furthermore, the main spindle is stopped at the journal part of the workpiece W by a fixed position stop mechanism (not shown).
Wa is stopped at the lowest position of the spindle rotation center. On the table 1, there is a first phase determining device 5 facing the headstock at a predetermined distance.
It is placed as shown in the figure. A hole 6a is drilled in the main body 6 of the phase determining device 5 concentrically with the axis of the main shaft,
A drive section 7 is fixed to the right end surface of the hole 6a. The cylinder 9 having the oil passages 9a and 9b of the driving part 7 has a flange 1 having center holes 11a and 12a at both ends.
1 and 12 are fixed, one end of the flange 11 is fixed concentrically to the end surface of the main body hole 6a, and a confirmation switch box 1 of the position confirmation part 14 is fixed to the end surface of the flange 12.
5 is fixed. A large diameter piston 16 is fitted into the cylinder 9, a center hole of the large diameter piston 16 is formed in the small diameter cylinder 10, and a small diameter piston 17 is fitted into the double piston. A sleeve 21 is fixed to the tip of the piston rod 16a of the large diameter piston 16 via a mounting flange 20, which is inserted into the main body hole 6a. Sleeve 21
has a small diameter hole 21b concentric with a large diameter hole 21a, a keyway 21c is cut in the circumferential axis direction, and the key holder is fitted into a hole 6b drilled in the radial direction in the center of the main body hole 6a. It is engaged with a key 23 at the tip of the shaft 22 and can be slid only in the axial direction by the large diameter piston 16. Also, the small diameter piston 17 has a center hole 1.
The slide shaft 18 is fixed to the left side of a flange 18b provided at the center of a sliding shaft 18 in the form of a long and thin pipe having a diameter 8a.
6b, and the right side is fitted into the center hole 12a of the flange 12, and its tip protrudes into the phase confirmation part 14 and is movable in the axial direction. The spring core 24 to be fitted into the large diameter hole 21a of the sleeve 21 has a flange 24a at the tip, and this flange 24a
A compression spring 25 is placed between the inner end face of the large diameter hole 21a and
is interposed so that the end surface of the spring core on the side of the flange portion 24a is always urged so as to come into contact with the end surface of the piston rod 16a of the large diameter piston 16. Furthermore, spring core 2
4 has a center hole 24b and a hole 2 having a larger diameter than the center hole 24b.
4c is bored, the left end of the sliding shaft 18 is fastened to the mouth of the hole 24b with a screw, and the push bar is inserted into the hole 18a of the sliding shaft 18 in the hole 24b so as to be slidable in the axial direction. The flange 28a at the tip of 28 is inserted. Flange 28a of pusher bar 28
A connecting piece 32 is fitted on the tip of the connecting piece 3, and this connecting piece 3
A joint shaft 33 is fitted into the sleeve hole 21b, and the joint shaft 33 is fitted into the sleeve hole 21b so as to be slidable in the axial direction. A push bar 2 is inserted into the hole 24b of the spring core 24.
A compression spring 29 is interposed between the flange 28a of 8 and the left end surface of the sliding shaft 18, and the inside of the flange 32a of the connecting piece 32, which is inserted into the hole 24c, is always the end of the hole 24c of the spring core. The connecting shaft 33 is urged to push out until it comes into contact with the wall surface. The joint shaft 33 has a center hole, and a large-diameter hole 33a at the tip thereof, and a female thread 33b is cut into the tip, and a pusher 34 of a gripper portion 36 is screwed into the female thread 33b. On the other hand, a bolt 38 is attached to the center hole 3 at the tip of the sleeve 21.
A disk-shaped mounting flange 37 having a diameter 7a is fixed, and a gripper main body 39 is fixed to the front end surface of the mounting flange 37 by bolts 40. Gritspa body 39
A rectangular bracket part 39c is provided on one end surface of a disc-shaped plate part 39a and has a slotted groove 39b in the center of the disc, and an elongated hole is formed in the center of this plate part 39a in the same direction as the slotted groove 39b. 39d is provided and is connected to the slot groove 39b and penetrated in the axial direction. The gripper main body 39 is attached to the sleeve 21 via the attachment flange 37 with the slot groove 39b horizontal. Furthermore, two holes 39e are bored in the bracket portion 39c in a direction perpendicular to the slot groove 39b and symmetrically with respect to the center of the disc. A pair of L-shaped grippers 43 are rotatably supported in the slot groove 39b by a support shaft 44 inserted into the hole 39e, and a gripping claw 45 is attached to the L-shaped tip of the gripper 43 by a bolt 46. Clamping surface 45
They are fixed in a symmetrical manner with a facing inside each other.
Further, a pair of L-shaped spring receivers 47 are provided on the side surfaces of the arms of the gripper 43, and a spring 48 is interposed between them, so that the gripper 43 is always urged to open. The pusher 34 screwed onto the tip of the joint shaft 33 has two square arms 34b facing outward perpendicular to the shaft center at the center of the stepped shaft having a center hole 34a.
is provided so as to face the gripper 43, and the arm 3
A push bolt 50 is screwed onto the tip of each of the push bolts 4b parallel to the axis with the hexagonal head first, and each push bolt 50 is provided with a lock nut 51 for preventing loosening. The arm 34b of the pusher 34 is inserted into the elongated hole 39d and slot 39b of the gripper main body 39, and the front end of the hexagonal head of the pusher bolt 50 comes into contact with the L-shaped outer end surface of the pair of grippers 43, and the pusher 34 is moved in the axial direction of the pusher. With this movement, the gripping claws 45 turn and move by an equal amount relative to the axis, so that the crank pin Wb is gripped. Furthermore, a hole 37b is formed in the mounting flange 37 parallel to the axis.
One end of the guide pin 52 is fitted, and the other end is inserted into a hole 34c provided in one of the arms 34b of the pusher 34 to guide the movement of the pusher 34 in the axial direction. In the center hole 34a of the pusher 34, there is a pusher 55 having a flange 55a at the tip.
is inserted into the hole 3 of the connecting shaft 33 so as to be movable in the axial direction.
3a, one end reaches the center hole of the connecting shaft 33 having the same diameter as the pusher hole 34a, and the compression spring 57 is interposed between the side surface of the hole 33a and a spring receiver collar 56 fitted in the middle of the pusher 55. The pusher is always urged to protrude.

On the other hand, the limit switch LS1 of the position confirmation unit 14,
The LS2 are fixed to the end face of the flange 12 of the drive section 7, and are fixed side by side in the confirmation switch box 15 with the LS1 on the outside.Dogs 58A and 58B are attached to the tip of the sliding shaft 18 that protrudes into the position confirmation section 14. It is fitted so as to be movable in the axial direction, and the forward end is confirmed by the dog 58A and limit switch LS2, and the backward end is confirmed by the dog 58B and limit switch LS1. Further, a flat dog 59 is attached to the rear end of the push bar 28 that protrudes from the center hole 18a of the sliding shaft 18 and is removably provided.
The guide pin 60 provided at the rear end of the sliding shaft is inserted into the hole 61a of the guide piece 61 provided at the rear end of the sliding shaft.
It is said to be a guide for the axial movement of 9. Dotsugu 5
Corresponding to 9, a proximity switch LS3 is provided in the confirmation switch box 15, and when there is no workpiece W, a dog 59 approaches the proximity switch LS3 to issue an abnormal signal.

Operation Now, the main shaft of the cylindrical grinder is stopped, pressure oil is supplied to the large diameter cylinder 9 of the phase determining device 5 from the oil passage 9b, the gripper part 36 is at the retreat end, and the gripper gripping claws 45 are in an open state. It is said that In this state, the unprocessed workpiece (crankshaft) W gripped by a loading manipulator (not shown) is loaded onto the V-shaped pedestal 3 of the chuck 2 which is stopped at a fixed position. Next, the journal portion Wa of the workpiece W is clamped with a weak force by the operation of a workpiece clamping device (not shown).
Subsequently, the pressure oil in the large diameter cylinder 9 of the phasing device 5 is switched and supplied from the oil passage 9a, the large diameter piston 16 is moved, and the sleeve 21 fixed to the piston rod 16a is moved to move the gripper portion toward the workpiece W side. 36 is advanced. As the large diameter piston 16 moves, the small diameter piston 17 also moves,
Even after the large diameter piston 16 comes into contact with the wall of the cylinder 9 and stops moving, the small diameter piston 17 moves while compressing the compression spring 25, and the spring core 24 is moved via the sliding shaft 18. When the spring core 24 moves, the compression spring 29 in the hole 24b and the connecting shaft hole 33
The center hole 3 of the pusher 34 is pressed by the spring 57 in a.
The pusher 55 protruding from the tip 4a moves forward toward the workpiece, and the tip flange 55a engages the crank pin Wb.
The reference surface of the workpiece W is pressed against the end surface of the pedestal 3 of the chuck 2 by the pressing force of the compression spring 57, and positioning in the axial direction is performed. When the small-diameter piston 17 continues to move and the spring core 24 is further moved, the pusher 34 is advanced toward the workpiece W via the joint piece 32 and the joint shaft 33, and the pusher bolt 50 engages the gripping claw 45 at the tip of the gripper 43. is simultaneously moved toward the crank pin side, and the clamping surface 45a abuts on the outer periphery of the crank pin portion Wb. When the spring core 24 continues to move thereafter, the forward movement of the pusher 34 is blocked and stopped by the gripper in contact with the workpiece W, so the compression spring 29 is compressed and compressed. The gripping claws 45 grip the outer diameter of the crank pin portion Wb by the pressing force, and the phase is determined. In this state, the limit switch LS2 of the position confirmation unit 14 is activated by the dog 5 fixed to the sliding shaft 18.
8A and outputs a grip confirmation signal. Since the pusher 34 is stopped from advancing, the dog 59 fixed to the pusher bar 28 is not approached by the proximity switch LS3 and no signal is output.
However, if there is no workpiece W in the chuck, pusher 5
5. Since the sliding shaft 18 cannot be stopped by the workpiece, the dog 59 approaches the proximity switch LS3, an abnormality signal is issued, and the subsequent operation is stopped.

The workpiece W, which has hitherto been clamped to the chuck 2 with a weak force, is now clamped strongly. Next, when the pressure oil in the large diameter cylinder 9 is switched and supplied from the oil passage 9b and the one chamber connected to the oil passage 9a is released, the spring core 24 is pushed by the springs 25 and 29 and moved. The flange 24a is retracted until the end surface thereof comes into contact with the tip of the piston rod 16a of the large diameter piston 16. During this time, the gripping claws 45 of the gripper section 36 are opened by the spring 48, and then the large-diameter piston 16 is retracted, the gripping claws of the gripper section are returned to the retracted end, and the pusher 55 is also retreated together, moving away from the tip of the workpiece W. It stands by in a protruded state due to the separation compression spring 57. In this state, the limit switch LS1 of the position confirmation unit 14 is set to dog 5.
8B, a signal indicating completion of phasing is issued, and the grinding operation continues.

Effects As detailed above, the present invention operates against the crank pin of the crankshaft in the axial direction, presses the crankshaft against the chuck side surface to position the crankshaft in the axial direction, and then the pair of arms provided on the pusher mechanism The gripping claws of the grippers are simultaneously moved toward the crankpin by an equal amount, and the guide surface grips the outer periphery of the crankpin to determine the phase, so the center of the outer periphery of the crankpin rough removal is indexed and unrolled. There is no balanced machining allowance, the depth of cut during grinding can be reduced, the grinding time is shortened, efficiency is improved, and there is no need to change the outside diameter of the crank pin.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of the present invention, Fig. 2 is a longitudinal cross-sectional view of the gripper section at a position shifted by 90 degrees, Fig. 3 is a cross-sectional view taken along the line A-A in Fig. 1, and Fig. 4 is a longitudinal cross-sectional view of the gripper part at a position shifted by 90 degrees. FIG. 5... Phase determining device, 6... Main body, 7... Drive section, 14... Position confirmation section, 16... Large diameter piston (main piston), 17... Small diameter piston (child piston), 21... Sleeve , 24... Spring core, 2
8... Push bar, 33... Joint shaft, 34...
Pushsha, 36...Gritzpa part, 39...Gritzpa body, 43...Gritzpa, 55...Press.

Claims (1)

[Scope of utility model registration request] In a phasing device that holds the journal portion of a crankshaft eccentrically and aligns the axis of the crank pin portion that is ground with the axis of the main shaft, a sleeve is fitted into the phasing body and is slidable in the axial direction by a parent piston. a pair of grippers, which are provided on a gripper body fixed to the tip of the sleeve via a flange, and whose gripping claws that abut the crank pin can be opened and closed in parallel; and a child piston that is fitted into the master piston. A spring core is fitted into the sleeve and is movable in the axial direction through the interposition of a compression spring that presses the child piston to the retreating end, and a sliding shaft which also serves as a piston rod of the child piston is fitted into the spring core. a push bar whose tip is inserted into the spring core and is biased to protrude toward the crank pin by a compression spring inserted in the spring core hole; and a push bar which is fixed to the tip of the push bar and fitted into the sleeve. A joint shaft to be inserted, and an arm screwed onto the tip of the joint shaft and provided symmetrically in a direction perpendicular to the axis, push bolts provided at both ends of the arms abut against the gripper due to the movement of the child piston. The gripper includes a pusher for opening and closing the gripper, and a pusher for axial positioning by abutting against the tip of the crank pin by means of a compression spring fitted into the pusher and interposed in a hole of the joint shaft. , the crankshaft is pressed against the chuck end surface by a pusher to position it in the axial direction, and at the same time the outer periphery of the crankpin is held by a pair of gripping claws that move symmetrically with respect to the axis center to determine the phase. A crank pin positioning device characterized by: