JP4023039B2 - Press machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a press machine such as a toggle punch press.
[0002]
[Prior art and problems to be solved by the invention]
In a press machine such as a punch press, when a tool is exchanged at the time of setup, a press ram that can be raised and lowered is moved up and retracted to the top dead center, and a tool such as a punch tool located below the press ram is exchanged.
[0003]
Toggle type punch presses have a second link member connected to a first link member that can rotate around a fulcrum, a press ram connected to the tip of the second link member, and a connecting portion of both link members is advanced and retracted by an advance / retreat lever. Thus, both link members are driven to bend, and the press ram moves up and down along with the bending. In such a toggle punch press, in order to increase the lifting stroke of the press ram in order to expand the tool change space, it is necessary to largely swing the connecting portion of both link members. For this purpose, it is necessary to increase the advance / retreat amount of the advance / retreat lever, and the drive source becomes larger. In addition, there is a limit to the amount of advancement and retreat.
[0004]
For this reason, a toggle type punch press has been proposed in which the fulcrum of the first link member is lifted to lift the entire toggle mechanism (for example, JP-A-8-1386). However, since the entire toggle mechanism is lifted, the lifting weight is heavy, and if the lifting height of the fulcrum is increased, the mechanism becomes a large-scale mechanism and the lifting drive source and the like become larger.
[0005]
An object of the present invention is to provide a press machine capable of greatly raising and retracting a press ram with a compact configuration during setup.
Another object of the present invention is to allow the press ram to be lifted and retracted by adjusting the smallest possible part.
Still another object of the present invention is to enable easy adjustment of the length of the press rod.
[0006]
[Means for Solving the Problems]
The press machine of the present invention comprises a press ram that can be raised and lowered, a press rod connected to the press ram, and a drive device that drives the press rod to raise and lower the press ram, the press rod A length adjusting means for adjusting the length of is provided.
According to this configuration, when the tool is changed, the press ram is lifted and retracted to the top dead center, and the length of the press rod is shortened by the length adjusting means. The press ram can be lifted and retracted to the position. Therefore, a large working space for tool change or the like can be obtained. In this case, since the length of the press rod is adjusted, unlike the case where the entire press rod is lifted, a large mechanism is not required to raise the evacuation height of the ram. Is small.
[0007]
In the present invention, the press rod may include a first link member and a second link member having one end connected to one end of the first link member and the press ram connected to the other end. Further, the drive device includes an advance / retreat member that advances / retreats the connecting portion between the first link member and the second link member, and an advance / retreat drive portion that advances / retreats the advance / retreat member. It is good also as what adjusts the length of a link member. For example, the toggle mechanism may be configured such that the press rod can be bent by the first and second link members, and the length of the second link member that is the link member on the press ram side may be adjusted.
When configured in this way, the length of the press rod can be adjusted by adjusting only a small portion.
[0008]
Further, the length adjusting means has a structure in which the press rod is divided into a ram side rod and a base end side rod which are connected to each other in a stretchable manner, and a slide member having a predetermined thickness can be inserted into the divided portion. And a ram-side rod raising / lowering means for raising and lowering the ram-side rod is provided . Specifically, the length adjusting means has the following configuration. That is, the lower portion of the base end side rod is formed in a hollow shaft shape, and the ram side rod is telescopically fitted into the hollow shaft portion so that the ram side rod and the base end side rod are The slide member is a member for bringing the upper end of the ram side rod into contact with the lower surface, and enters and exits a lateral hole formed in the hollow shaft-like portion of the base end side rod. An indentation recess is formed on the lower surface of the slide member to allow the upper end of the ram side rod to enter, and the indentation recess is inserted into the proximal end rod to a predetermined position. It is assumed that the upper end of the ram side rod can enter in the slid state . When the press rod is constituted by the first link member and the second link member as described above, it is preferable that the press rod is divided at the second link member. In that case, a part of 1st link member and a 2nd link member becomes a base end side rod, and the remaining part of a 2nd link member becomes a ram side rod.
When comprised in this way, a press rod is used for the drive of a normal press ram in the state which interposed the slide member in the division | segmentation part. When exchanging the tool, the press rod can be shortened by pulling out the slide member and lifting the ram side rod by the ram side rod lifting means, and this shortened state can be maintained. For this reason, it is possible to easily adjust the length of the press rod.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. This embodiment is an example applied to a toggle type punch press. In FIG. 1, an upper turret 2 and a lower turret 3 as tool supports are coaxially installed on an upper frame portion 1a and a lower frame 1b in a C-shaped frame 1, and a plurality of punches are placed on these upper and lower turrets 2, 3. A tool 6 and a die tool 7 are installed side by side in the circumferential direction. When each punch tool 6 is indexed to the ram position, it is connected to the press ram 14 and driven up and down. The press ram 14 is supported by the upper frame portion 1 a via the guide member 8 so as to be movable up and down, and is driven up and down by the drive device 13. The press ram 14 has a plurality of selectable strikers 59A and 59B that respectively strike the punch tool 6.
[0010]
This drive device 13 drives a toggle-type press rod 18 that moves the press ram 14 up and down by a bending operation by an advancing / retracting member 19 that can advance and retract in the horizontal direction. The advance / retreat member 19 is driven by a crank-type advance / retreat drive unit 20 using a servo motor 21 as a drive source. The press rod 18 is formed by connecting a short first link member 46 and a long second link member 47 so as to be freely bent by pins 41. The second link member 47 has a lower end that is rotatably coupled to the upper end of the press ram 14. The first link member 46 is rotatably supported at the fulcrum A.
[0011]
The advance / retreat member 19 has an advance / retreat transmission lever 19c connected to the distal end side of the advance / retreat member main body 19b so that the advance / retreat transmission lever 19c can be pivoted up and down, and the tip of the advance / retreat transmission lever 19c can be pivoted up and down to the pin 41 of the bent portion of the press rod 18. It is connected to. The vertical displacement of the bent portion accompanying the bending operation of the press rod 18 is absorbed by the vertical swing of the advance / retreat transmission lever 19c. The advance / retreat lever main body 19b is supported by two parallel guide rails 31, 31 (FIG. 4) provided on the upper frame portion 1a via the guide member 19a.
[0012]
The advancing / retreating drive unit 20 is provided with a disc-shaped crank 22 on the output shaft 21a of the servo motor 21, and one end of a connecting rod 26 is rotatably connected to an eccentric position of the crank 22. The other end is rotatably connected to the base end of the advance / retreat member main body 19b. In addition to a pulse coder (not shown), the servo motor 21 is provided with a detector 36 that detects the rotational position of the output shaft 21a via gears 33 and 34.
[0013]
As shown in FIG. 2, the press rod 18 can be adjusted in length by a length adjusting means 51 that retracts the press ram 14 upward during tool change or the like. The length adjusting means 51 has a split structure in which the second link member 47 of the press rod 18 is composed of a ram-side rod 47a and a proximal-end-side second rod 47b that are connected to each other so as to expand and contract. A slide member 52 having a predetermined thickness that can be inserted in a direction perpendicular to the length direction and a ram-side rod lifting / lowering means 53 (FIG. 3) for raising and lowering the ram-side rod 47a are provided in the portion. The proximal end side second rod 47b and the first link member 46 constitute the proximal end side rod 18b.
[0014]
In the divided portion of the second link member 47, the upper end portion of the ram side rod 47a is detachably coupled to the lower portion of the proximal end side rod 18b, that is, the lower portion of the proximal end side second rod 47b. Specifically, the lower portion of the base end side rod 18b is formed in a hollow shaft shape, and the upper end portion of the ram side rod 47a is fitted in the hollow hole so as to be extendable and contractible. At the upper end of the ram side rod 47a, a pair of action rods 54, 54 projecting in a direction perpendicular to the longitudinal direction is provided. A long hole 55 through which the action rod 54 of the ram side rod 47a protrudes is formed along the longitudinal direction in the lower portion of the proximal end side rod 18b that has a hollow shaft shape.
[0015]
As shown in FIG. 3, the ram side rod lifting / lowering means 53 includes a ram side rod lifting means 63 for lifting the ram side rod 47a and a ram side rod lowering means 60 for lowering the ram side rod 47a. The ram side rod lifting means 63 is provided with a cylinder device 56 such as an air cylinder facing the action rods 54 on both sides of the ram side rod 47a. These cylinder devices 56 are installed on the raising / lowering guide member 8 of the press ram 14 or installed on the upper frame portion 1a, and the pressing member 57 provided on the piston rod 56a pushes up the action rod 54. Thereby, the ram side rod 47a is pushed up to the side which shortens the 2nd link member 47. FIG.
The ram side rod lowering means 60 is attached to the proximal end side second rod 47 b of the second link member 47. The ram side rod lowering means 60 is a means that acts on the action rod 54 to push down the ram side rod 47a and forcibly return the second link member 47 to the length during the punching operation. It consists of
[0016]
As shown in FIG. 2, the slide member 52 is removably inserted into a lateral hole 64 formed along the upper bottom surface of the hollow shaft-shaped portion of the proximal end side rod 18b. It is driven forward and backward by an air cylinder type forward / backward drive device 58 attached to the rod 18b. Further, an entry recess 52a for entering the upper end 47aa of the ram side rod 47a is formed on the lower surface of the slide member 52 facing the upper end 47aa of the ram side rod 47a. The upper end 47aa of the ram side rod 47a can enter the entry recess 52a in a state where the slide member 52 has entered the base end side rod 18b to a predetermined position. The upper end 47aa is formed as a boss protruding from the upper end surface of the ram side rod 47a.
As shown in FIG. 3, an inward stopper 62 is provided at the lower end of the hollow shaft-like portion of the base end side rod 18b so that the engagement step portion 61 formed on the ram side rod 47a can be engaged. . The lowering of the ram side rod 47 a pushed down by the ram side rod lowering means 60 is restricted by the engagement of the engagement step portion 61 with the stopper 62.
[0017]
The operation of the press machine having this configuration will be described. The punching operation is performed as follows. When the crank 22 of the advancing / retreating drive unit 20 makes one revolution, the advancing / retreating member 19 performs a reciprocating operation. During this one reciprocating operation, while the advance / retreat member 19 reaches the center position of the advance / retreat stroke S from the left end position in FIG. 5, the press rod 18 changes from the bent state to the extended state to the left, Accordingly, the press ram 14 descends from the top dead center to the bottom dead center. While the advancing / retracting member 19 reaches the right end position from the center position of the stroke S, the bent portion of the press rod 18 changes from the extended state to the bent state to the right, and accordingly, the press ram 14 moves upward from the bottom dead center. It rises to the dead point. When the advancing / retracting member 19 returns from the right end position to the left end position, the press ram 14 moves up and down as described above. In this way, while the advance / retreat member 19 performs one reciprocal advance / retreat operation, the press ram 14 repeats the up / down operation twice, and the punch operation by the punch tool 6 is performed twice. The press rod 18 may be driven only on one side of the center position.
[0018]
When changing the tool, the second link member 47 of the press rod 18 is shortened by the length adjusting means 51 with the press ram 14 raised to the top dead center. That is, first, the slide member 52 is moved from the normal position in FIG. 2 to the predetermined position as shown in FIG. Next, the pressing member 57 of the cylinder device 56 of the ram side rod raising / lowering means 53 is driven to rise as indicated by a chain line in FIG. 3 to push up the ram side rod 47a. As a result, the upper end 47aa of the ram side rod 47a enters the entry recess 52a of the slide member 52, and the second link member 47 is shortened.
As a result, the press ram 14 can be lifted and retracted to a position higher than the position where the press ram is simply lifted and retracted to the top dead center, so that a large working space can be obtained and the punch tool located below the press ram 14 can be replaced. Can be done easily. In particular, in the case of a press machine having a configuration in which a plurality of strikers 59A and 59B, each of which strikes a punch tool, is provided in one press ram 14 as in the case of this embodiment, the amount of lift and retreat of the press ram 14 is small However, in this embodiment, since the press ram 14 can be lifted and retracted to a sufficiently high position as described above, the work such as tool change can be easily performed.
[0019]
Here, as the length adjustment of the press rod 18, only the length of the second link member 47 of the press rod 18 is adjusted, so that only the small portion of the press rod 18 can be adjusted. Moreover, since the length adjustment is performed by sliding the slide member 52 and raising and lowering the ram side rod 47a, the length adjustment can be easily performed.
[0020]
In addition, although the said embodiment demonstrated the case where the drive device which raises / lowers the press ram 14 is a toggle type | formula, it is applicable also to the press machine provided with the drive device of another system.
[0021]
【The invention's effect】
The press machine of the present invention comprises a press ram that can be raised and lowered, a press rod connected to the press ram, and a drive device that drives the press rod to raise and lower the press ram, the press rod Since the length adjusting means for adjusting the length of the press ram is provided, the press ram can be largely lifted and retracted with a compact configuration when changing the tool.
The press rod comprises a first link member and a second link member, the drive device comprises an advance / retreat member for advancing / retreating the connecting portion of both link members, and the adjusting means determines the length of the second link member. In the case of adjusting, it is possible to adjust the length of the press rod by adjusting only the smallest possible portion.
The length adjusting means is a divided structure of a ram side rod and a base end side rod in which the press rods are connected to each other in a telescopic manner, a slide member can be inserted into the divided portion, and the ram side rod is raised and lowered. to provide for a ram-side rod lifting means for the length adjustment of the press rods can be easy.
[Brief description of the drawings]
FIG. 1 is a partially broken side view showing a press machine according to an embodiment of the present invention.
FIG. 2 is a partially broken side view showing an enlarged main part of the press machine.
FIG. 3 is a partially cutaway front view showing an enlarged main part of the press machine.
FIG. 4 is a plan view cross-sectional view of the press machine.
FIG. 5 is a schematic explanatory diagram of the press machine.
FIG. 6 is an operation explanatory view of a length adjusting unit in the press machine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 13 ... Drive apparatus 14 ... Press ram 18 ... Press rod 18b ... Base end side rod 19 ... Advance / retreat member 20 ... Advance / retreat drive part 46 ... 1st link member 47 ... 2nd link member 47a ... Ram side rod 47b ... Base end side 2nd Rod 51 ... Length adjusting means 52 ... Slide member 53 ... Ram side rod lifting / lowering means

Claims (2)

Length that adjusts the length of the press rod in a press machine including a press ram that can be raised and lowered, a press rod connected to the press ram, and a drive device that drives the press rod to raise and lower the press ram. setting the adjustment means only, the length adjusting means, the press rod, with the divided structure of the ram-side rod and the proximal end side rods telescopically coupled to each other, the slide having a predetermined thickness on the divided portion A ram-side rod raising / lowering means for raising and lowering the ram-side rod is provided, and a lower portion of the proximal end-side rod is formed in a hollow shaft shape, and the hollow shaft-like portion is formed in the hollow shaft-like portion. By fitting the ram side rod in a telescopic manner, the ram side rod and the base end side rod are connected to each other in a telescopic manner, and the slide member is connected to the ram side rod. A member that abuts the upper end of the door on the lower surface, and is slidably inserted in a lateral hole formed in the hollow shaft-shaped portion of the proximal end side rod in the direction of entry and exit, An entry recess for entering the upper end of the rod is formed, and the entry recess is configured such that the upper end of the ram side rod can enter in a state where the slide member slides to a predetermined position inside the proximal end side rod. press machine, wherein the lower child.   The press rod includes a first link member and a second link member having one end connected to one end of the first link member and the press ram connected to the other end, and the driving device includes a first link. It comprises an advance / retreat member for advancing / retreating the connecting portion between the member and the second link member, and an advance / retreat drive unit for advancing / retreating the advance / retreat member, and the length adjusting means adjusts the length of the second link member. Item 2. A press machine according to item 1.

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