JPH04100647A - Turret punch press - Google Patents

Abstract

PURPOSE:To decrease friction resistance so as to speed up the rotation of punches and dies and to decrease backlashes so as to improve working accuracy by using a ball reduction gears in the rotation transmission route from motors to the punches and dies in the punch die rotating devices of the turret punch press. CONSTITUTION:The punches 4 and the dies 5 are installed on the respective circumferences of the upper and lower turrets 1, 2. These punches 4 and dies 5 are arrayed in the punch position P and are rotated in synchronization by the punch rotating device 9 and the die rotating device 10. The rotating member 12 is rotated via the ball reduction gear 16 and a spur gear 18 by the servo motor 21 is the above-mentioned die rotating device 10 and further, the rotation is transmitted by transmission pins 15 to rotate and index the dies 5 at a prescribed angle. On the other hand, a servo motor 45 of the punch rotating device 9 is rotated to index and rotate the punches 4 via the ball reduction gear 36. The punches 4 and the dies 5 are synchronously rotated in such a manner, by which punching is executed. A large reduction ratio is obtd. under low friction with the above-mentioned ball reduction gears 36, 16, by which the punches 4 and the dies 5 are rotated at a high speed and the time for indexing is shortened. In additions, the ball reduction gears 36, 16 are reduced with backlashes, by which the working accuracy is improved and the life of the punches and dies is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a turret punch press equipped with a mold rotation device.

[Conventional technology]

Conventionally, there is a turret punch press in which upper and lower molds are synchronously indexed and rotated by a mold rotation device, so that irregularly shaped holes in various directions can be machined using a pair of upper and lower molds.

The mold rotation device described above uses a gear train to reduce the rotation of a servo motor and transmits the reduced speed to the mold, and a worm is used to obtain a large reduction ratio.

[Problem to be solved by the invention]

However, since a worm is used, there is a large frictional resistance, which makes it difficult to increase the speed of indexing rotation of the mold, resulting in a problem that the punching cycle time becomes long.

Furthermore, due to the superposition of backlash in the gear train, a slight deviation occurs in the phase angle between the upper and lower molds, resulting in lower processing accuracy and shorter mold life.

An object of the present invention is to provide a turret punch press that can reduce the frictional resistance of the drive transmission system in a mold rotation device, increase the speed of mold rotation, and improve processing accuracy by reducing backlash. be.

[Means to solve the problem]

The turret punch press of the present invention uses a ball speed reducer in the rotation transmission path from the motor to the mold in the mold rotating device. The mold rotating device indexes and rotates an upper mold and a lower mold that are rotatably provided on upper and lower turrets.

A ball speed reducer has a well-known structure in which, for example, a ball is sandwiched between a fixed plate and an eccentric plate that revolves, through a ball groove with a specific curved path, and the ball speed reducer is a ball reducer that has a well-known structure in which a ball is sandwiched between a fixed plate and an eccentric plate that revolves. Obtain deceleration motion using an operating principle equivalent to motion.

[For production]

According to this configuration, the rotation of the motor is transmitted to the mold via the ball reducer, but since the ball reducer has low friction and a large reduction ratio, it is not necessary to interpose high-friction parts such as worms. The rotation of the motor can be transmitted to the mold without any problems. Therefore, the overall frictional resistance of the rotation transmission path is reduced.

Further, unlike gears, the ball speed reducer does not have backlash, so it is possible to eliminate backlash from being superimposed on the rotation transmission path from the motor to the mold. Therefore, the mold can be indexed and rotated with high precision.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 to 6.

In FIG. 5, the upper turret 1 and the lower turret.

The parts 2 are rotatably installed in the upper frame part 3a and the lower frame part 3b of the frame 3, respectively, and are rotated in synchronization with each other by a drive device (not shown). A large number of upper molds and lower molds are each installed on the circumference of the upper and lower turrets 7 1.2, and some of these molds include the upper mold 4 and the upper mold 4 for index rotation shown in the figure. A lower mold 5 is used.

A ram 6 is provided at a punch position P at the tip of the upper frame 3a so as to be able to move up and down, and is connected to a crankshaft 8 via a pitman 7.
It is driven up and down by the rotation of. A T-shaped groove is provided at the lower end of the ram 6, and a T-shaped groove 4c provided on the upper turret 1 is removably engaged therewith.

This engagement and disengagement is performed as the upper die 4 moves in and out of the punching position WP due to the rotation of the upper turret 1. By driving the ram 6 up and down while the upper mold 4 is connected,
Punching is performed. An upper mold rotating device 9 and a lower mold rotating device 10 are installed near the punching position P of the upper and lower frames 3a, 3b, respectively.

FIG. 1 is an enlarged view of the lower mold rotating device 10, and corresponds to the cross section taken along line II in FIG. In FIG. 1, the lower die 5 consists of a gouge holder 5a rotatably installed in the die mounting hole of the lower turret 2, and a gouge tool 5b fitted into the die holder 5a. Engagement recess 1
1 is provided. The gooey holder 5a is elastically stopped from rotating at the origin angle by a ball detent 33 provided on the lower turret 2.

Below the lower mold 5 is a cylindrical rotating member 1 concentrically with the lower mold 5.
2 is arranged and rotatably supported by a bearing 14 on a fixed base 13 provided on the lower frame portion 3b. The rotating member 12 has a transmission pin 15 passed through a guide hole in a peripheral wall so as to be able to move up and down, and the rotation of the servo motor 21 is transmitted from a gear part 12a provided on the outer periphery.

The upper end of the transmission pin 15 removably engages with the engagement recess 11 of the lower mold 5, and the roller 23 provided at the lower end moves over the flange-shaped pin guide surface 25 of the guide surface member 24. Roll. A transmission pin 1 is provided in a part of the circumferential direction of the bottle guide surface 25.
A notch 25a (FIG. 3) into which the transmission pin 15 is dropped is provided, and a member 26 serves as a receiver for receiving the transmission pin 15 that has fallen into the notch 25a.
is attached to the lifting cylinder 27. These supports constitute a pin lifting device 28 with a member 26 and a lifting cylinder 27.

The gear portion 12a on the outer periphery of the rotating member I2 is connected to the ball speed reducer 1.
It meshes with the spur gear 18 provided on the output shaft 17 of 6.
A servo motor 21 is connected to a pulley 20 of an input shaft 19 of a ball speed reducer 1116 via a belt 22.

An origin detection dog 29 and a deceleration dog 30 are provided on the upper part of the rotating member 12, and detectors 31 and 32 consisting of proximity switches and the like for detecting these are attached to the fixed base 13.

FIG. 4 shows the upper mold rotating device 9. The upper mold 4 has a punching tool (not shown) in the center member 4b of the punch holder 4a.
It is rotatably installed in the mold mounting hole of the upper turret 1 via a fixing sleeve 34. The punch holder 4a has a ball detent 3 provided at the lower end.
5, the rotation is elastically stopped by the upper turret 1 at the origin angle. The punch holder 4a has a gear portion 4d on its outer periphery, which meshes with a spur gear 47 of the output shaft of a ball speed reducer @36 installed on the upper turret 1. The ball speed reducer 36 is installed for each of the plurality of rotary upper molds 4 of the upper turret 1. A driven-side meshing member 37a of a meshing clutch 37 is provided on the input shaft of the ball reducer 36, and when the upper mold 4 comes to the punching position P due to the rotation of the upper turret 1, the driving-side meshing member 37a It meshes with 37b.

The engagement member 37b on the drive side is provided at the lower end of the lifting rotation shaft 38, and the lifting rotation shaft 38 is mounted on a fixed cylinder 39 with a bearing 40.
The rotary sleeve 4 is rotatably supported via a spline (not shown) so that the rotation can be transmitted. The fixed cylinder 40 is fixed to the upper frame portion 3b. The upper end of the vertical rotation shaft 38 is rotatably connected to a cylinder 42 for engagement and disengagement via a shaft coupling 43, and the engagement and disengagement of the dog clutch 37 is performed by expansion and contraction of the cylinder 42 for engagement and disengagement. A pulley 44 is integrally provided on the rotating sleeve 41, and a belt 46 is hung between it and the output pulley of a servo motor 45. Therefore, the rotation of the servo motor 450 causes the belt 46. Pulley 44° and rotating sleeve 4
1 to the rotary lifting shaft 38, and from the dog clutch 37 to the ball speed reducer 8!36 of the upper turret 1.

FIG. 6 is an exploded perspective view of the ball speed reducer @16 in the lower mold rotating device 10 (FIG. 1), and the ball speed reducer 36 shown in FIG. 4 is similarly constructed. Ball deceleration I! 16 is a housing in which the output plate 49 and the eccentric plate 50 are housed and the lid is closed by the fixed plate 51, and the ball 54 is sandwiched between the ball grooves 52 and 53 of the eccentric plate 50 and the fixed plate 51. . The center paths of these ball grooves 52, 53 are respectively formed into an internal cycloidal curve and an external cycloidal curve. A ball 55 is inserted between the eccentric plate 50 and the output plate 49 via a recess 56.

The eccentric plate 50 is connected to the bearing 5 by the eccentric pin 57 of the input shaft 19.
8, and this revolving movement causes rotation in proportion to the difference in wave numbers between the ball grooves 52 and 53. This rotational motion is extracted to the output plate 49 via the ball 55. Therefore, a large reduction ratio can be obtained. The ball speed reducer 36.degree. 16 is not limited to the configuration shown in FIG. 6, but various configurations can be used.

The operation of the above configuration will be explained. Fig. 1 Lower mold rotating device 1
0, the rotating member 12 is waiting at the origin angle,
The transmission pin 15 falls into the notch 25a of the pin guide surface 25, and the receiver is supported by the member 26. When the lower mold 5 comes to the punching position P due to the rotation of the lower turret 2, the lifting cylinder 2
At 7, the receiver raises the member 26 to the level of the pin guide surface 25 and engages the transmission pin 15 with the engagement recess 11 of the lower mold 5. Then, the servo motor 21 decelerates the ball I!
When the rotating member 12 is rotated via the rotating member 16 and the flat gear 18, the rotation is transmitted by the transmission pin 15, and the lower mold 5 rotates together with the rotating member 12. Thereby, the lower mold 5 is indexed to a desired angle.

The upper die rotating device 9 in FIG. 4 engages the dog clutch 37 with the engaging/disengaging cylinder 42 when the upper die 4 comes to the punching position P due to the rotation of the upper turret 1.

By rotating the servo motor 45 in this state,
The rotation is transmitted to the ball speed reducer 36, and the upper mold 4 is indexed and rotated.

In this way, the upper and lower molds 4 and 5 are rotated synchronously to perform punching. The upper and lower molds 4 and 5 are powered by servo motors 45.2
Return to the origin angle by rotation 1.

According to this configuration, both the upper mold rotating device 9 and the lower mold rotating bag W10 have the ball reducer 36 in the rotation transmission path.
．． 16 is used, but the ball speed reducer 36.16 can provide a large reduction ratio with low friction. Therefore, the upper and lower molds 4.5 can be rotated at a higher speed than those using conventional worms, the indexing time can be shortened, and a small output servo motor 45.21 can be used.

Furthermore, unlike gears, the ball speed reducer 36□16 does not cause hacklash, and therefore hacklash in the rotation transmission path from the servo motor 4521 to the upper and lower molds 4.5 can be reduced. In other words, there is only the basso crush in the spur gears 47 and 18, and there is no superimposition of the basso crush. Therefore, the upper and lower molds 4 and 5 can be indexed and rotated with high precision, thereby improving processing accuracy and extending the life of the molds.

When the ball speed reducer 36.16 is used, unlike a worm, there is no rotation locking effect during punching, but the rotation can be sufficiently locked by the servo motor 45.21.

In the above embodiment, the ball speed reducer 36, 16 is used in both the upper mold rotating device 9 and the lower mold rotating device 10, but the ball speed reducer may be used in only one of them.

〔Effect of the invention〕

The turret punch press of this invention uses a ball speed reducer in the rotation transmission path of the mold rotating device, which reduces frictional resistance and enables high-speed indexing rotation of the mold with a small output motor, which allows punching. cycle time can be shortened.

In addition, by using a ball speed reducer, it is possible to eliminate the superimposition of backlash in the rotation transmission path from the motor to the mold, which allows the mold to be indexed and rotated with high precision, improving processing accuracy and mold life. This has the effect of improving the

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a lower mold rotating device in a turret punch press according to an embodiment of the present invention, FIG. 2 is a schematic reduced plan view of the lower mold rotating device, and FIG. 3 is a bin guide surface thereof. 4 is a sectional view of the upper mold rotating device, FIG. 5 is a schematic side view of the turret punch press, and FIG. 6 is an exploded perspective view of the ball speed reducer. 1... Upper turret, 2... Lower turret, 3b...
Lower frame part, 4... Upper mold, 5... Lower mold, 9.
... Upper mold rotation device, 10 ... Lower mold rotation device, 12
...Rotating member, 13...Fixed base, 15...Transmission bottle, 16...Ball reducer, 18...Spur gear, 21
...Servo motor, 36...Ball reducer, 37.
... Dog clutch, 45 ... Servo motor, 50
...Eccentric plate, 51...Fixing plate, 52.53...Ball groove, 54...Ball, P...Punch position Patent applicant Murata Machinery Co., Ltd.

Claims (1)

[Claims] In a turret punch press in which an upper mold and a lower mold, which are rotatably provided on upper and lower turrets, are indexed and rotated synchronously by a mold rotation device, a rotation transmission path from a motor in the mold rotation device to the mold is used. A turret punch press characterized by using a ball speed reducer.