JPH0211229A - Bolster for press machine - Google Patents

Abstract

PURPOSE:To improve the operating efficiency of a press line by providing plural lifter pins on the upper surface of a bolster so that they can project freely and raising the press die from the upper surface of the bolster. CONSTITUTION:Plural hydraulic cylinders 28 are provided vertically in the bolster 21 and a pin holding plate 30 is fixed integrally to a plunger 29. Further, many lifter pins 32 and plural positioning pins 34 penetrating the bolster 21 are arranged on the holding plate 30. After the empty bolster 21 together with the holding plate 30 is lifted by the operation of the hydraulic cylinders 28, a die 22 to be changed is mounted to face the pin 32 and the positioning pins 34, then, the cylinder 28 is lowered and the die 22 is positioned on the bolster 21 through engaging projections 26, 27. In this way, the press line is automated because slinging work for the die 22 is dissolved. Consequently, the operating efficiency of the press line is improved.

Description

[Detailed Description of the Invention] <Industrial Application> The present invention relates to a bolster that is attached to a press machine so as to be freely put in and taken out of the press machine, and to which a press mold is detachably fixed.
In particular, the press mold can be easily and quickly attached and detached.

<Prior Art> Automobile bodies, particularly monocoque-type bodies, are formed by welding together a large number of sheet metal panels. usually,
These sheet metal panels are made by first cutting strips drawn from coils into panel materials with shapes corresponding to the respective sheet metal panels, and then passing these panel materials through a transfer press line to process them into sheet metal panels with predetermined shapes.

As is well known, in press working, the time required to replace a press die is one of the factors that greatly influences the operating rate of the press equipment.

For this reason, when considering the followability of a press line to an automobile assembly line, a pair of press dies is used to press several hundred panels of panel material, and this work is performed sequentially on all press dies. Therefore, each sheet metal panel must be temporarily stored in a stockyard and then supplied to the assembly line as needed. Similarly, when cutting panel material from a coil, a pair of press dies are used to punch out several hundred to 1,000 pieces of panel material from the coil, and this work is performed on all press dies.
These panel materials are continuously supplied to the transfer press line side.

By the way, the work of loading and unloading press molds into and out of the press machine is only partly automated, and the work of loading and unloading press molds into and out of the press machine is only partially automated, and the work of loading and unloading press molds into and out of the press machine is only partially automated. Because the weight of the press mold itself is very large, the handing-over process is mostly done using an overhead crane or the like for slinging.

<Problems to be Solved by the Invention> When it is planned to automate a series of press operations according to the automobile production plan, it is natural to eliminate the work of loading and unloading press molds using slings, and to eliminate the need for a bolster to move in and out of the press machine. It will be necessary to use a stacker crane or the like to transfer the press molds between the press mold stockyard and the press mold stockyard.

However, in the conventional model, the press mold is placed directly on the top of the bolster, so there is no room to insert a fork such as a stacker crane between the bolt frame mold and the press mold. It was simply impossible to automate the work.

Means for Solving the Problems> The press machine bolster according to the present invention is a bolster that is attached to the press machine so as to be freely put in and taken out of the press machine, and to which a press mold is detachably fixed. A plurality of lids that are driven to protrude and move up and down to lift the press mold from the upper surface of the bolster.
It is characterized by incorporating a pin.

<Operation> After guiding the bolster out of the press machine together with the press mold, the lifter pin is raised to its rising end, and the press mold that was placed on the top surface of the bolster is lifted off the top surface of this bolster. hold in state. In this state, a fork such as a stacker crane is inserted between the top surface of the bolster and the bottom surface of the press mold, and the press mold is carried out from the bolster.

When transporting a new press mold to the bolster, place the press mold at the rising end or place it on the top surface of the lid pin, then lower the lift cup to its lower end and load the new press mold. Place it on the top of the bolster. Then, this bolster is sent into the press machine together with the press mold.

Embodiment Example 1 A first example showing a schematic structure of an embodiment in which the press press bolster according to the present invention is applied to a production line for automobile panel materials.
As shown in the figure, the strip 46 drawn out from the coil 11 passes through the cleaning device 12 and has its residual strain removed by the leveler 13, and then is sent from the loop pit 14 to the press machine 16 side by the feeder 15, where it is formed into a panel of a predetermined shape. The material is divided into 17 pieces and sent to the bailer 20 by conveyor IJ19.
They are stacked on top of each other.

As shown in FIG. 1 and FIG. 2 showing the planar shape of the press machine 16, in this embodiment, two sets of bolsters 21 are installed in the press machine 16 so as to be able to move in and out alternately. A pair of upper and lower press molds 22 is connected to each bolster 21 by a guide rail 2 connected to the inside of the press 16.
3, respectively, at the mold exchange positions CI and C2 set above.

In other words, when one bolster 21 is installed in the press 8116, the other bolster 21 is installed at the mold exchange position gc.
. And press 8
116, the press molds 22 are sent out of the press machine 16 together with the bolster 21, and moved along the guide rails 23 to release the metal. It stops at the vacant mold exchange position C, , C2. After that, the bolster 21 in the standby state moves to the guide rail 2 together with its press die 22.
3 into the press machine 16, and press processing is performed using a new press mold 22. On the other hand, in parallel with this work, the coil 11 and the bailer 20 are replaced as necessary.

FIG. 3 is an enlarged view of the planar shape of the bolster 21 and its It
As shown in FIGS. 4, 5, and 6, which represent the /-IV perspective cross-sectional shape, the V-V arrow cross-sectional shape, and the ■-■ arrow cross-sectional shape, respectively, there is a press mold on the upper surface of the bolster 21. A pair of engagement protrusions 26 and 27 that can be engaged with a pair of positioning grooves 24 and 25 formed on the bottom surface of the press molds 22 are provided so as to protrude at right angles to each other. It is placed on the upper surface of the bolster 21 with the engaging protrusions 26 and 27 engaged with the positioning grooves 24 and 25. A plurality of hydraulic cylinders 28 (six in this embodiment) are erected within these bolsters 21, and a pin holding plate 30 is integrally fixed to the plunger 29 thereof.

This pin holding plate 30 has a plurality of lift turbines 3 (ten in this embodiment) passing through the upper plate 31 of the bolster 21.
2 and a plurality of (in this embodiment, two) positioning fins 34 each having a tapered conical tapered portion 33 at its tip are provided protrudingly. It will protrude from the top surface. The tip of the positioning pin 34 is fitted into the bottom surface of the press mold 22 to roughly position the press mold 22 with respect to the bolster 21, and the positioning groove 24 of the press mold 22 with respect to the engagement protrusions 2G, 27. A fitting hole 35 is provided corresponding to the positioning pin 34 to facilitate engagement of the positioning pin 25.

The lift coupe pin 32 comes into contact with the bottom surface of the press mold 22 to lift the press mold 22 from the top surface of the bolster 21, and a fork such as a stacker crane (not shown) can be inserted between the bolster 21 and the press mold 22. This is to secure space. Therefore, the protrusion length of the positioning pin 34 is set to be thicker than the protrusion length of the rifling pin 32 from the pin holding plate 30.

In other words, the hydraulic cylinder 28 of the empty bolster 21 operates at the above-mentioned mold exchange positions C, C2, and the pin holding plate 30 is raised to its rising end, and the lift turbine 32 and the positioning pin 35 are moved to the bolster 21. Make it stick out from the top.

In this state, the press die 22 is carried in from a stockyard (not shown) using a stacker crane or the like, and is pressed onto the lift turbine 32 so that the fitting hole 35 of the press die 22 directly faces the tapered portion 33 of the positioning pin 34. The mold 22 is transferred (see the two-dot chain line in FIG. 6). Afterwards,
The hydraulic cylinder 28 is activated again to lower the pin holding plate 30 to its lower end. As the pin holding plate 30 descends, the press die 22 also descends together with the lifter pins 32, etc., and is finally placed on the upper surface of the bolster 21. At this time, the position of the press die 22 is determined. 75
924.25 is the engagement protrusion 26, 27 on the upper surface of the bolster 21
The press mold 2 is engaged with the bolster 21, respectively.
2 accurate positioning is performed.

In this embodiment, pinions 37 that engage with rack plates 36 fixed to each of the four corners of the bolster 21 are rotatably mounted at each of the four corners of the pin holding plate 30 so that the pin holding plate 30 can move vertically in parallel without tilting. Further, two racks 11vi38, whose ends are engaged with the pair of pinions 37, are provided so as to be movable back and forth in the left-right direction in FIG. 6 via guide rollers 39. The number of teeth and the module of each pinion 37 are all set to be equal. Therefore, as the pin holding plate 30 moves up and down, the pinion 37 rolls against the rack plate 36, and as a result, the vertical rod 38 moves as shown in FIG. The pair of pinions 37 are synchronized by moving in the middle and left and right, so that the pin holding plate 30 is held horizontally without being tilted.

As shown in FIG. 7, which is an enlarged view of the part viewed from the arrow ■ in FIG. 3, and FIG. Individual(
In this embodiment, six (6) proximity switches 40 are embedded in an annular shape at equal intervals, and a dog mounting plate 42 having a plurality of dock mounting holes 41 corresponding to these proximity switches 40 is attached to each press plate. They are bolted to the center of the bottom of the mold 22, respectively. One to six dogs 43 are fitted into the dog mounting hole 41 at predetermined locations corresponding to the type of each press die 22, and the proximity switch 40
The arrangement state of the dogs 43 is read based on the combination of the detection numbers 41 of these plurality of proximity switches 40, the type of press mold 22 placed on the upper surface of the bolster 21 is detected, and this is detected as a preset press. A determining means (not shown) for determining whether or not the mold 22 is used is connected. In other words, even if a press die 22 that is different from the preset press die 22 is somehow brought in by mistake and placed on the bolster 21 in a positioned state, the proximity switch 40
/j! The determination means determines that the press die 22 is incorrect based on the arrangement of the dogs 43, sounds an alarm or lights up an alarm lamp, and causes the normal press die 22 to be carried in again using a stacker crane or the like. , the press line can be stopped if necessary.

If the press die 22 placed on the bolster 21 is as set in advance, the lower die of the press die 22 is fixed to the bolster 21 in the press 4!116,
The upper die is fixed to the punch side of the press machine 16. The means for fixing the upper die to the press machine 16 is exactly the same as the conventional one, or the means for fixing the lower die to the press 45i1 in this embodiment.
6 side, and in this point it differs from the conventional one in which the lower mold fixing means is incorporated into the bolster 21. As shown in FIG. 9 showing the schematic structure of the lower mold fixing means, FIG. 10 showing the broken structure of its main part, and FIGS. 11 and 3 showing the shape of its left side, it is possible to On the upper surface of the bolster 21 that is positioned and fixed within the press machine 16, there are a plurality of TWs (six in this embodiment) extending in the left and right direction in FIG.
II44 are carved, and on the press [16 side, four T-grooves 45 that are in line with these T-grooves 44 are formed on the upstream and downstream sides in the threading direction of the strip 46 pulled out from the coil 11. has been done. A slider 47 is slidably engaged with each of these T grooves 45, and one end of a chain block 51 that meshes with a sprocket 50 rotatably attached to the tip of a piston rod 49 of a hydraulic cylinder 48 is connected to each slider 47. ing. The other ends of these chain blocks 51 are fixed to the press machine 16 side, and one end of the chain blocks 51 is extended to the right or pulled back to the left in FIG. 9 as the piston rod 49 expands and contracts. The slider 47 is moved into the T-slot 44 by this chimney block 51.
It is now possible to transfer to ゜45. A lock pawl 53 is pivotally attached to each slider 47 via a pin 54, and the tip thereof presses down a flange portion 52 formed on the lower die of the press die 22. 4
It is in contact with a jack 55 assembled to 7.

A rod 57 is provided between the lock claw 53 and the slider 47 and has a compression coil spring 56 for biasing the proximal end of the lock claw 53 toward the jack 55. A hydraulic pipe 58 attached to the chain block 51 is connected to the jack 55, and the lock pawl 53 is rotated by supplying and discharging pressure oil to the jack 55.

Therefore, when the bolster 21 is positioned and fixed in the press 16, the slider 47, which is in a standby state within the 1" groove 45,
is transferred to the T144 side by the operation of the hydraulic cylinder 48, and after coming into contact with the flange portion 52 of the press die 22 on the bolster 21 and stopping, the jack 55 is activated and the lock pawl 53 moves the flange portion 52 of the lower mold to the bolster. Hold it down to 21. Thereafter, the strip 46 is passed through the press 16 and pressing begins.

In this embodiment, a plurality of lifter pins 32 are provided protruding from the bottle holding plate 30, and the bottle holding plate 30 is always raised and lowered in parallel using a plurality of hydraulic cylinders 28. As long as the mechanism is such that the upper end surface of the bottle 32 can be raised and lowered in a flush state at all times, there is no problem in employing other known means.

<Effects of the Invention> According to the bolster for a press machine of the present invention, a plurality of lifter pins that protrude from the upper surface of the bolster and lift the press die from the upper surface of the bolster are incorporated, so that the upper surface of the bolster and the press It would be possible to secure a space between the bottom of the mold and the fork of a crane, etc., and the sling work could be abolished and automation of this press line could be planned.

[Brief explanation of the drawing]

Fig. 1 shows an example of an embodiment in which the bolster for a press machine according to the present invention is applied to a production line for automobile panel materials, Fig. 2 is a plan view of the press part, and Fig. 3 is a plane view of the bolster. Figure 4 is a sectional view taken along the IV'-IV arrow, and Figure 5 is
The figure is a cross-sectional view taken along the line ■-■ in Figure 3, Figure 6 is an enlarged view of the cross-section taken along the line M-M in Figure 3, and Figure 7 is an enlarged view taken along the line ■ in Figure 3. , Figure 8 shows the 7th part with the press mold mounted.
FIG. 9 is a conceptual diagram of the lower mold clamping device, FIG. 10 is a cutaway view of the main part thereof, and FIG. 11 is a left side view thereof. Also, in the figures, 11 is a coil, 16 is a press machine, 1
7 is a panel material, 21 is a bolster, 22 is a press mold,
24 and 25 are positioning grooves, 26 and 27 are engagement protrusions, and 28
is a hydraulic cylinder, 29 is a plunger, 30 is a bottle holding plate, 32 is a lift turbine, 33 is a tapered portion, 34 is a positioning bottle, 35 is a fitting hole, 36 is a rack plate, 37 is a binion, 38 is a rack rod, 39 is a guide roller. Figure 2 Patent applicant Mitsubishi Motors Corporation representative Patent attorney Hikaru Seishi (and one other person) Figure 8 Figure 10 Figure 11

Claims (1)

[Claims] In a bolster that is attached to a press machine so that it can be taken in and taken out of the press machine, and to which a press die is detachably fixed, the press die is lifted up and down from the upper surface of the bolster by being driven up and down so as to be able to protrude from the upper surface of the bolster. A press machine bolster featuring multiple lifter pins.