JPH02255226A - Feed and return apparatus for feed bar in press - Google Patents

Abstract

PURPOSE:To reduce an approach operation speed and to prevent a work from missing clamping by providing a lever rocking in the feed and return direction of a feedbar round the center part of rocking by a drive force transmitted from a crankshaft and deviating this central part of rocking to the return side. CONSTITUTION:When the center part 19 of rocking of a lever 16 is deviated to the return side, the locus of the end part of a side connecting a lever 16 with a feedbar 4 is made so asymmetric that the return side rises remarkably. The return operation of the feedbar 4 ends early and the feed operation begins lately, consequently, these operating times are lengthened. When a setting angle and position of an eccentric member to the crankshaft 1 are shifted to such a side that the time for beginning the feed and return of the feedbar 4 is delayed, the timing of operation for the feed and return lag. When the return operation is delayed until the conventional time, the feed operation is begun further lately and since the approach operation of the feed bar 4 is desired to be finished before the feed operation begins, the approach operation can be prolonged and further decelerated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for feeding and returning a feed bar of a press machine, and can be effectively used in a press machine in which a slide is returned quickly. be.

[Background technology]

FIG. 6 is a front view of the press machine, showing the press machine and feed bar feeding/returning device. A slide 3 is connected to the eccentric portion IA of the crankshaft 1 via a connecting rod 2, and the slide 3 moves up and down as the crankshaft 1 rotates.

A device 5 for feeding and returning the feed bar 4 is arranged on one end side of the crankshaft 1. The specific structure of this sending/returning device 5 is shown in FIGS. 7 and 8.

As shown in FIG. 7, an eccentric member 6 serving as a lever that projects in the radial direction of the shaft is fixed to the end of the crankshaft 1, and a sliding member 7 is rotatably fitted to the tip of the eccentric member 6. A pin 8 is provided. The sliding member 7 is slidably engaged with a horizontal elongated hole 11 of a movable body 10 that moves up and down guided by a guide bar 9, and a connecting rod 12 that extends downward is attached to the movable body 10.
A rack 12A is formed at the lower part of the connecting rod 12 as shown in FIG.

The rack 12A is a binion 14 housed in the case 13.
The teeth 15A of the rotating member 15 mesh with each other through the rotating member 1.
The upper end of a lever 16 extending downward is connected to the lever 5 by a pin 17. The lever 16 is disposed at a longitudinally intermediate portion and is swingable in the left-right direction of the press machine, that is, in the feed and return directions of the feed bar 4, about a swing center shaft 19 to which a bridge member 18 is rotatably fitted. The lever 16 has a bridge member 1 in order to be able to move up and down with respect to the pivot axis 19.
A long hole 20 into which a hole 8 is slidably inserted is formed.

A carrier 22 that is movable along a guide bar 21 is connected to the lower end of the lever 16. This connection is achieved by a sliding member 24 rotatably fitted to a pin 23 at the lower end of the lever 16, which moves the carrier 22 up and down. This is done by being slidably engaged with the long groove 25. Two sliders 26 are attached to the carrier 22 so as to be movable in the front-rear direction of the press machine along a guide bar 27, and two feed bars 4 are movable up and down on pins 2B implanted in each slider 26. inserted into.

As shown in FIGS. 6 and 9, each feed bar 4 is slidably received in the feed and return directions by a member 30 at the receiving end of the drive unit 29.
0, the driving force is transmitted from the crankshaft 1 via the driving force transmission mechanism, whereby the two feed bars 4 approach, separate, raise, and lower in order to clamp and unclamp the workpiece with the fingers 31. It is designed to do this.

The driving force transmission mechanism is composed of a rotating cam fixed to the crankshaft 1, a lever that swings with this cam, and the like.

When the crankshaft 1 is rotated in order to move the slide 3 up and down to perform press working, the eccentric member 6 rotates,
As a result, the movable body 10 and the connecting rod 12 move up and down, the pinion 14 and the rotating body 15 rotate, and the lever 16 swings about the swing center axis 19, and the carrier 22
, the feed bar 4 is fed and returned via the slider 26.

In addition to the above-mentioned feeding and returning, the feed bar 4 is also operated by the drive unit 29 and the receiving member 30 for the above-mentioned approach, separation, raising,
Each of the lowering operations is performed and the timing of these operations relative to crank angle is shown in FIG. The slide 3 reaches the top dead center when the crank angle is 0 degrees, and the slide 3 reaches the bottom dead center when the crank angle is 180 degrees.

In the conventional device described above, as shown in FIG. 8, the pivot axis 19 of the lever 16 is located directly below the connection between the rotating member 15 and the lever 16 by the pin 17 in the neutral state where the lever 16 is in an upright position. Therefore, when the lever 16 swings, the end of the lever 16 connected to the feed bar 4, that is, the lower end of the lever 16, traces a trajectory A shown in FIG. 10. This locus A has a symmetrical shape that is symmetrical in the feeding and returning directions.

[Problem to be solved by the invention]

In the press machine, the crankshaft 1 is rotated while changing the speed during one rotation, and the slide 3 is lowered at a low speed in the processing area where the slide 3 approaches the bottom dead center, making it suitable for forging press processing, for example. There is a press machine that raises the slide 3 at high speed and returns it quickly after reaching the bottom dead center and finishing the machining.
A mechanism for changing the speed during rotation is, for example, disclosed in Japanese Patent Application Laid-open No. 6
0-124498 by means of an eccentric linkage. B in FIGS. 3 and 5 is a diagram showing the movement of the slide 3, which descends at a low speed in the processing area and then rises at a high speed. Further, C1D, ESFSG, and H are diagrams showing the feed operation, return operation, approach operation, separation operation, ascending operation, and descending operation of the feed bar 4, respectively. In these FIGS. 3 and 5, since the crankshaft 1 does not rotate at a constant speed, the scale of the crank angle is an uneven scale.

As described above, when the speed of the crankshaft 1 during one revolution is changed so as to quickly return the slide 3, the time from the return operation of the feed bar 4 indicated by D to the feed operation indicated by C becomes shorter. The time for the approach action shown by E and the rising action shown by G, which are performed between the actions of , becomes shorter. Approach activation time (indicated by TI in Figures 3 and 5)
Shortening means that the time required for clamping the workpiece by the fingers 31 becomes shorter, and since the feed bar 4 and the fingers 31 clamp the workpiece while moving at high speed, clamping errors of the workpiece occur. There is a risk that this will happen.

Furthermore, when the approach operation time becomes short and the feed bar 4 approaches at high speed, the slide 3 may not move sufficiently depending on the approach operation timing of the feed bar 4 determined by the structure of the driving force transmission mechanism and the drive unit 29. Before reaching the height position, the fingers 31 begin to penetrate the underside of the slide 3, and as a result, the lower mold 33 of the bolster 32 shown in FIG.
At the same time, a situation arises in which the fingers 31 interfere with the upper die 34 after pressing the workpiece.

It is an object of the present invention to make it possible to lengthen the time between the return operation and the feed operation of the feed bar, thereby making it possible to lengthen the approach operation time and to reduce the approach operation speed, and as a result, the approach operation speed can be reduced. Another object of the present invention is to provide a feeding/returning device for a feed bar in a press machine, which can prevent the occurrence of workpiece clamping errors and prevent interference between fingers and an upper mold.

(Means for solving the problem) Feed bar feeding in the press machine according to the present invention,
The return device is a device attached to a press machine that uses a crankshaft that rotates while changing the speed during one rotation to move the slide at a low speed in the processing area and quickly return it at a high speed after processing. The lever has a lever that swings in the feeding and returning directions of the feed bar around a swinging center disposed at the longitudinally intermediate portion by a driving force transmitted from the feed bar, and the swinging of the lever sends the feed bar, In the non-returning device, the swinging center portion is deviated toward the return side so that the locus of the end of the lever connected to the feed bar has an asymmetrical shape in which the return side is largely raised. be.

In addition to the above, the feed bar feeding/returning device for a press machine according to the present invention has an eccentric member fixed to the crankshaft that protrudes in the radial direction of the shaft, and rotation of the eccentric member is transmitted. The invention is characterized in that the lever swings and the angular position of the eccentric member relative to the crankshaft is shifted to the side that delays the start timing of feed and return of the feed bar.

[Effect]

By shifting the position of the pivoting center of the lever toward the return side, the locus of the end of the lever connected to the feed bar is made into an asymmetrical shape with the return side rising significantly, and the return operation of the feed bar ends quickly. The feed operations will start later, so the time between these operations will be longer. This makes it possible to secure a longer approach operation time and to lower the approach operation speed than before.

In addition, if the mounting angle position of the eccentric member relative to the crankshaft is shifted to the side that delays the feeding and return start timings of the feed bar, the timing of the feed and return operations will be delayed overall, and the return operation will be delayed to approximately the same timing as before. If so, the feed operation can be started later by that amount, and the approach operation of the feed bar can be finished before the feed operation starts or the raising operation starts, so the approach operation time is even longer. This makes it possible to further reduce the approach operation speed.

〔Example〕

One embodiment of the present invention will be described below. In the following description, members that are the same as those already described are given the same reference numerals, and the description thereof will be simplified or omitted.

In FIG. 1, O indicates the position of the pivot axis 19 of the lever 16 in the conventional device shown in FIG.

In the conventional device, the position of the swing center axis 19 is determined by the rotation member 15 by the pin 17 in the neutral state where the lever is in an upright position.
The position was directly below the connection part between the lever 16 and the lever 16,
In this embodiment, as shown in FIG. 1, the swing center axis 19 is deviated to the return side of the feed bar 4.

FIG. 2 shows a locus when the lever 16 swings due to the rotation of the rotating body 15 around the swing center axis 19 whose position is deviated in this way, and shows the trajectory of the lever 16 on the connection side with the feed bar 4. The lower end, which is the end, draws a locus indicated by I. This locus {circle around (2)} has an asymmetrical shape in which the rise on the return side of the feed bar 4 is larger than that on the feed side. The lever 16 and the carrier 22 that feeds the feed bar 4 and moves it in the return direction are connected by a sliding member 24 being slidably engaged with a vertically long long groove 25 of the carrier 22. The left and right components of (2) cause the feed bar 4 to perform feeding and return operations, and the vertical components cause feeding and return operations.
Since it is not involved in the return operation, the return operation of the feed bar 4 ends early and the feed operation starts later. Such movement of the feed bar 4 is shown by C' and D' in FIG.

As a result, the time from the end of the return operation until the start of the forward operation becomes longer. As a result, the raising operation of the feed bar 4 can be changed as shown by G' in FIG. 3, and the start timing of the approaching operation is the same as before, but the end time is changed from the conventional one, as shown by E' in FIG. 3. You will be able to do it later. That is, the approach operation time can be set to T2, which is longer than the conventional T, and therefore the approach operation speed can be reduced.

Therefore, even if the rotational speed of the crankshaft 1 at this time becomes high in order to quickly return the slide 3 after reaching the bottom dead center, the workpiece can be reliably clamped by the fingers 31. Also, by slowing down the approach actuation speed, the finger 3 will not move until the slide 3 has reached a sufficient height position.
1 enters the lower side of the slide 3, and interference between the fingers 31 and the upper die 34 can be prevented.

In addition, in order to perform the raising operation and the approaching operation of the feed bar 4 as shown by G' and E' in FIG. If the drive unit 29 and receiver member 30 shown in FIG. 6 are driven by the driving force from the transmission mechanism, the shape of the rotating cam may be changed.

In addition to the above, in this embodiment, as shown in FIG.
The mounting angular position of the eccentric member 6 relative to the crankshaft I is changed, and the positional relationship between the eccentric member 6 and the eccentric portion IA to which the connecting rod 2 of the crankshaft I is connected is changed. In FIG. 4, J indicates the mounting angular position of the eccentric member 6 in the conventional device shown in FIG. It has been changed to K.

According to this, the feed operation timing and return operation timing of the feed bar 4 will be delayed overall, and if the return operation is delayed to approximately the same time as the conventional device, as shown by D# in Fig. 5, this delay will be compensated for. As shown by G'', the feed operation can be further delayed.The approach operation of the feed bar 4 only needs to be completed at least before the feed operation starts, so while the upward movement is G'', the approach operation can be further delayed.
The approach activation time can be expressed as T.
It becomes possible to make the T longer than 2, and the approach operation speed can be further reduced.

In the embodiment described above, only the approaching operation of the feed bar 4 was changed, but other than this, the raising operation may also be changed as necessary.

Further, in the apparatus of the above embodiment, the workpiece conveyance operation of the feed bar 4 is three-dimensional, but in the apparatus according to the present invention, the workpiece conveyance operation of the feed bar 4 is two-dimensional in which the feed bar does not perform an upward movement or a downward movement. It can also be applied to dimensional cases. Furthermore, the device according to the present invention can be applied to cases where the mechanism for rotating the crankshaft while changing the rotational speed during one rotation in order to quickly return the slide is other than the above-mentioned eccentric link mechanism, and furthermore, the device according to the above-mentioned embodiment The feeding/returning device for the feed bar in the example was composed of a moving body 10, a connecting rod 12, a pinion 14, a rotating body 15, etc., but the structure of this device is arbitrary, and at least the feed bar feeding/returning direction is Furthermore, in order to swing the lever, an eccentric member fixed to the crankshaft and protruding in the radial direction of the shaft may be provided.

〔Effect of the invention〕

According to the present invention, in a press machine that returns the slide quickly, it is possible to lengthen the approach operation time of the feed bar and reduce the approach operation speed, thereby preventing the occurrence of clamping errors of the workpiece and Interference with the mold can be prevented.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a device according to an embodiment of the present invention, showing a state in which the pivot axis of the lever is deviated, and FIG. 2 is a diagram showing the pivot locus of the lever of the device in FIG. Figure 3 is the first
This is a diagram showing the characteristics of the device shown in the figure, and shows the operation of the slide and feed bar in relation to the crank angle and stroke. Figure 4 is a diagram showing the state where the mounting angle position of the eccentric member with respect to the crankshaft has been changed. , Fig. 5 is a diagram showing the characteristics of the device having the structure shown in Figs. 1 and 4, and is similar to Fig. 3, Fig. 6 is a front view of the press machine, and Fig. 7 is a conventional one. Fig. 8 is a diagram similar to Fig. 4 showing the device, Fig. 8 is a diagram similar to Fig. 1 showing the conventional device, Fig. 9 is a cross-sectional plan view of the press machine, and Fig. 10 is the swing locus of the lever in the conventional device. FIG. 11 is a diagram showing the timing of each operation of the feed bar with respect to the crank angle. DESCRIPTION OF SYMBOLS 1... Crankshaft, 3... Slide, 4... Feed bar, 5... Feeding and return device, 6... Eccentric member, 10... Moving body, 15... Rotating member , 16...
Lever, 19... Swing center shaft, 26... Slider,
29... Drive unit 7), 33... Lower die, 34...
Upper mold. Figure 1 Applicant AIDA Engineering Co., Ltd. Agent Patent Attorney Sanzo Kinoshita (2 idiots) Figure 4 Figure 10 Figure 11 Figure 18σ

Claims (2)

[Claims] (1) A device attached to a press machine that moves the slide at a low speed in the machining area and quickly returns it at a high speed after machining using a crankshaft that rotates while changing the speed during one revolution, It has a lever that swings in the feeding and returning directions of the feed bar around a swinging center located at the longitudinally intermediate portion by the transmitted driving force, and the swinging of this lever sends and returns the feed bar. Feed in a press machine, characterized in that the swinging center is deviated to the return side, and the locus of the end of the lever connected to the feed bar has an asymmetrical shape in which the return side is largely raised. Bar feeding and returning device. (2) In claim 1, an eccentric member protruding in the shaft radial direction is fixed to the crankshaft, and the rotation of the eccentric member is transmitted to swing the lever, and the eccentric member is attached to the crankshaft. 1. A feeding/returning device for a feed bar in a press machine, characterized in that the angular position at which the feed bar is attached to the feed bar is shifted to the side that delays the feed/return start timing of the feed bar.