JPS58223548A - Balance device of machine tool - Google Patents

Abstract

PURPOSE:To shorten the machining preparation time by making a balance weight movable so as to keep balance in response to the imbalance of a work. CONSTITUTION:A balance shaft 16 removably coupled with a main shaft 3 arranged in a straight line at the rear end of the main shaft 3, a balance weight 18 coupled at a right angle to the balance shaft 16 as capable of being raised/ lowered or fixed on a base bed 17 vertically to the axial direction of the balance shaft 16, and a raise/lower unit 19 raising/lowering the balance weight 18 are provided. Accordingly, the balance weight 18 can be moved in response to the imbalance quantity of a work, thereby the preparation time prior to the work machining can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a balance device for a machine tool used when machining an unbalanced workpiece.

Generally, when machining an unbalanced workpiece, a) the rotation of the spindle does not move at a constant angular velocity, resulting in uneven cutting or chip damage, and b) each part of the machine does not move at a constant angular velocity. C) When the workpiece is rotated in an unbalanced state, part of the motor power is consumed for purposes other than cutting power, reducing the cutting efficiency of the motor. There is a point. Conventionally, to solve this problem, a balance weight corresponding to the unbalance was attached to the face plate of the spindle to maintain balance, but with this method, it was necessary to prepare various types of balance weights depending on the type of workpiece. However, it also had the disadvantage of requiring a lot of time to install the balance weight.

In view of the above, the present invention provides a low-cost balance device that balances the workpiece according to the amount of unbalance by making the - number of balance weights movable, shortens the preparation time for machining the workpiece, and provides a low-cost balance device. This is what I am trying to do.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 10. In FIG.
5 is a tailstock rotatably supported on a spindle 4 which can be moved horizontally toward and away from the headstock 2; 6 is a face plate device; A large face plate 7 fixed to the tailstock shaft 5, a slide face plate 8 mounted on the large face plate so as to be movable in a direction perpendicular to the main shaft 3, and a swivel face plate 9 rotatably supported on the slide face plate. Consists of. A workpiece 10 is composed of a central shaft portion 11, a vertical arm portion 12, and an eccentric pin portion 13. and 1
4 is a balance device according to the present invention, which includes a balance shaft 16 arranged in a straight line at the rear end of the main shaft 3 and detachably engaged with the main shaft 3 via a clutch device 15; A base 17 is fixed perpendicularly to the axial direction of the central outer flange 1.6a with bolts 35, and the balance shaft 1 is fixed to the base with bolts 35.
The balance weight 18 is engaged with the balance weight 18 so that it can be raised and lowered in a direction perpendicular to the balance weight 6, and a lifting device 19 for raising and lowering the balance weight. In addition, 20.21 in FIG. 2 are the upper and lower cases of the balance device 14, and 22
23 is the gear box on the upper case, and 23 is the lifting device 1.
9, a balance motor of the drive device 24; 25, a coupling lever of a coupling device 26 for meshing and coupling the gear train of the drive device; 27, a positioning lever of a positioning device 28 for positioning the base 17 in a vertical position; 29 is a clutch lever 131 of a clutch coupling device 30 for coupling the clutch device 15, and a clutch lever 131 connects the base 17 to the balance shaft 16.
This is a rotation handle of a rotation device 32 for rotation around . Further, numeral 33 in FIG. 3 is a meshing lever of a meshing device 34 for meshing the gear train of the rotating device 32.

Further, in FIG. 5, reference numeral 36 denotes a pair of left and right guide grooves with a 1'-shaped cross section formed in the base 17 in a direction perpendicular to the balance shaft 16, and 37 a T-nut slidably fitted into the grooves 36;
A clamp bolt 38 is screwed into the nut 37 to fix the balun and the weight 18 to the base 17.

As shown in FIG. 5, the elevating device 19 includes an elevating screw 39 rotatably supported in the central vertical groove 17a of the base 17, and a elevating screw 39 that can be freely raised and lowered in a direction perpendicular to the balance shaft 16. It consists of a nut 41 that is screwed and fixed to the balance weight 18 via a nut receiver 40. A drive device 24 that drives this lifting device 19
As shown in FIG. 5, the motor 23 and its drive shaft 23
a transmission shaft 43 connected to a via bevel gears 42a and 42b and rotatably supported by the gear box 22;
A large gear 45 meshed with a small gear 44 at the lower end of this shaft 43
and the large gear is spline fitted to the gear box 2.
2, a spline shaft 46 rotatably and movably supported by the spline shaft 46, and a pinion 4 fixed to the lower end of the spline shaft.
7, and an elevating gear 48 fitted to the upper end of the elevating screw 39 so as to engage and detachably engage the pinion. The coupling device 26 of this drive device 24 is connected to the fourth.
5.6 As shown in Fig. 5.6, the connecting lever 25, the pinion 50 fixed to the tip of the rotating shaft 49, the rack 51 meshing with this pinion, and the gear box 22. A shifter 53 that is fitted to a fixed shifter shaft 52 so as to be movable up and down and formed integrally with the rack 51, a collar 54 that connects and fixes the shifter and the spline shaft 46, and this collar and the large gear 45.
and a compression spring 55 interposed between. In FIG. 7, 81 is a scale for elevating and lowering positioning attached to the upper case, and 82 is an indicator arrow on the balance weight side that moves up and down along this scale 81.

Further, the rotation device 32 of the base 17 has a rotation angle of 4.5°8.1.
As shown in Figure 0, the handle 31 and its handle shaft 31
a fore-and-aft shaft 57 connected to a via bevel gears 56a and 56b and rotatably supported by the gear box 22;
A vertical shaft 60 with a worm 59a connected to the other end of the shaft 57 via bevel gears 58a, 58b and rotatably supported by the gear box 22, and a worm wheel 59b meshing with the worm 59a are provided to balance the balance. axis 16
A spline shaft 61 is supported on the gear box 22 so as to be slidable and rotatable in an axial direction parallel to the above, a pinion 62 is fixed to the tip of the spline shaft, and a spline shaft 62 is attached to the base 17 so as to mesh with the pinion. It consists of a rack 63 fixed to the soil periphery. and the rotation device 3
As shown in FIGS. 4 and 8, the meshing device 34 for meshingly connecting the second pinion 62 and the rack 63 includes the meshing lever 33, a pinion 64 fixed to the tip of the lever shaft 33a, and this pinion. A rack rod 65 that meshes with the rack rod and moves in the front-rear direction, a shifter 66 fixed to the tip of the rack rod, and a guide rod 67 that guides the shifter.
It is comprised of a collar 68 that connects and fixes the lower end of the shifter 66 to the spline shaft 60.

Further, the positioning device 28 for the base 17 includes the positioning lever 27 and its lever shaft 27a, as shown in FIG.
A pinion 69 fixed to the tip of the rack 70, a rack 70 that meshes with the pinion, a positioning pin 71 fixed to the lower end of the rack, a pin receiver 72 formed at the upper end of the base 17, and a rack 70 that meshes with the pinion. It is composed of a compression spring 74 interposed between the lower end and the receiving portion 22a of the gear box 22 that bears the pin 71.

In addition, the clutch device 15 described in 11 is a main shaft side clutch:
1' 15a, and a balance shaft side clutch 15b.
8.9 As shown in Figure 8, the clutch lever 29, a vertical shaft 76 connected to the lever shaft 29a via bevel gears 75a and 75b, a pinion 77 fixed to the lower end of the vertical shaft, and a pinion 77 fixed to the lower end of the vertical shaft. A rack rod 78 that meshes and moves in the front-rear direction, a rack rod receiver 78 fixed to the case 21, and a ring-shaped keyway 79 fixed to the rack rod 78 on the outer periphery of the main shaft side clutch 15a. It is composed of a shifter 80.

Next, to explain the operation, in order to adjust the balance device 14, first, by using the push button inside the front door 2Oa of the upper case 20, the main shaft 3 connected to the balance shaft 16 is rotated, and the base 217 is approximately rotated. Make it vertical. Next, in order to engage the pinion 62 of the rotation device 32 and the rack 63, the engagement lever 33 is operated once. Then, the lever shaft 33a rotates, and the rack rod 65 is rotated through the pinion 64.
moves forward and the shifter 66 moves forward, so the spline shaft 61 moves forward and the pinion 62 at the tip of the spline shaft 61 moves forward.
The rack 63 of the base 17 is engaged with the rack 63 of the base 17. Next, in order to disconnect the main shaft 3 and the balance shaft 16, the clutch lever 29 is operated to disconnect the clutches 15a and 15b. At this time, due to the rotation of the clutch lever 29, the bevel gear 7
5a+75b, the vertical shaft 76 rotates, and the rack rod 78 rotates rearward (headstock side) through the pinion 77 at its lower end.
The clutches 15a and 15b are disengaged, and the main shaft 3 and the balance shaft 16 are separated. Next, when the handle 31 is rotated to make the base 17 vertical, the front-rear shaft 57 rotates via the bevel gears 56a and 56b, and the vertical shaft 60 rotates via the bevel gears 58a and 58b, so that it engages the worm 59a. The worm wheel 59b rotates, and the base 17 rotates together with the rack via the tip pinion 62 of the spline shaft 61, so that it becomes vertical. Then, the positioning lever 27 is operated to fix the base plate 17 with the positioning pin 71. At this time, by operating the positioning lever 27, the rack 70 is lowered via the pinion 69, the positioning pin 71 is fitted into the pin receiver 72, and the base 17 is moved to the case 2.
Fixed to 0. Then, the clamp bolt 38 is loosened and the balance weight 18 is raised or lowered according to the amount of unbalance. To do this, first, the connecting lever 25 is operated to engage the pinion 47 of the drive device 24 and the lifting gear 48.

At this time, the rotation of the connecting lever 25 causes the shifter 53 with the rack 51 to descend via the pinion 50, so the spline shaft 46 connected and fixed to the shifter 53 also descends, and the pinion 47 at the lower end of the spline shaft 46 is connected to the elevating gear 48. mesh. Therefore, the drive shaft 23a of the motor 23 and the lifting gear 48 are bevel gears 42a.

42b1 are connected via gears 44, 45 of different sizes and pinions 47, and when the motor 23 is driven, its rotational force is transmitted to the lifting gear 48, and the lifting screw 39 rotates. By rotating this lifting screw 39, the balance weight 18 is
It moves up and down guided by the groove 36. After setting the balance weight 18 to the desired position, the clamp bolt 38
to fix the balance weight 18 to the base 17, switch the connection lever 25 to release the connection between the pinion 47 of the drive device 24 and the lifting gear 48, and then switch the positioning lever 27 to fix the positioning pin 71 to the base 17. Pin receiver 7
Remove from 2. Then, turn the handle 31 to release the clutch 15.
The base plate 17 is rotated slightly until the clutches 15a and 15b engage, and then the clutch lever 29 is switched to engage the clutches 15a and 15b.
5b are engaged to connect the main shaft 3 and the balance shaft 16.

Then, the engagement lever 33 is switched to move the spline shaft 61 backward, and the rack 63 of the base 17 and the pinion 62 are separated. Then balance axis 16 and balance weight 1
8 can rotate integrally with the main shaft 3.

That is, if the workpiece 10 and the balance device 14 are not balanced, after setting the base 17 and the balance weight 18 to almost the upper position (vertical), operate the engagement lever 33 to engage the rack 63 and the pinion 62, and then release the clutch lever. -29 to disconnect the clutches 15a and 1511. Then, after turning the handle 31 to finely adjust the base 17 to the vertical position, the positioning lever 27 is operated to fix the base 17, the connecting lever 25 is operated to engage the pinion 47 and the lifting gear 48, and the motor 23 Drive the balance weight 18
to raise and lower. After that, operate the lever 25.2 in the opposite manner to the above.
7, 29, 33 and the handle 31, and adjust the balance device 14.

As is clear from the above description, the present invention includes a balance shaft disposed in a straight line at the rear end of the main shaft and detachably engaged with the main shaft, and a balance shaft fixed to the balance shaft perpendicular to the axial direction thereof. This device includes a base, a balance weight engaged with the base so that it can be raised and lowered in a direction perpendicular to the balance axis, and a lifting device for raising and lowering the balance weight.

Therefore, according to the present invention, the balance weight can be moved according to the amount of unbalance of the workpiece, and the preparation time before machining the workpiece can be shortened.In addition, there is no need to prepare various balance ways F as in the past, and the cost can be reduced. ° We can provide cheap balance equipment.

[Brief explanation of the drawing]

Figures 1 to 10 show one embodiment of the present invention, in which Figure 1 is an overall side view of the machine tool, Figure 2 is a front view of the balance device, Figure 3 is a side view thereof, and Figure 4 is a side view of the machine tool. The figure is A in Figure 2.
-A sectional view, Figure 5 is a BB sectional view in Figure 4, Figure 6 is a CC sectional view in Figure 4, Figure 7 is a front view showing the vertical positioning scale of the balance weight, The figure is D in Figure 4.
-C sectional view, FIG. 9 is a sectional view taken along line EE in FIG. 2, and FIG. 10 is a sectional view taken along line FF in FIG. 1: Machine body, 2: Headstock, 3: Spindle, 4: Shinshindai, 5
: Tailstock shaft, 6: Face plate device, 14: Balance device, 15:
Clutch device, 16: Balance shaft, 17: Base, 18:
Balance weight, 19: Lifting device. Applicant Shin Nippon Koki Co., Ltd. Agent Tsunehisa Nakamura

Claims (1)

[Claims] a balance shaft disposed in a straight line at the rear end of the main shaft and removably engaged with the main shaft; a base fixed to the balance shaft perpendicular to the axial direction thereof; and a base fixed to the base perpendicular to the balance shaft. 1. A balance device for a machine tool, comprising: a balance weight that is engaged with the balance weight so that it can be raised and lowered in a fixed direction; and a lifting device for raising and lowering the balance weight.