JP3298743B2 - Press method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressing method for processing different types of workpieces in an appropriate order, and more particularly to a pressing method capable of reducing the number of vertical movements of a press when pressing different types of workpieces. .

[0002]

2. Description of the Related Art Conventionally, in a press line for a door panel of an automobile, for example, different types of workpieces are alternately supplied to a single press machine to perform a press work, thereby coping with high-mix low-volume production. In such a press line, it is necessary to change the press die each time the supplied work is different, and the press die of the upper and lower split type must be replaced in a state where the upper and lower dies are integrated. As shown in FIGS. 3 to 5, the mold exchange was performed. That is, as shown in FIG. 3 which is a plan view of the press machine, an arrow,
The work W is carried in and out in the direction, and a press work such as hemming is performed by a mold A ′ for the work W.
When pressing different kinds of workpieces W ', it is necessary to replace the mold A' with the mold B '. In this case, the molds A', B 'are moved by moving the molds A', B 'in the direction of the arrow. 'Are being exchanged. As shown in FIG. 4, at the start of the press work, first, the upper die 81 of the mold A 'is gripped by the ram 82 and is lifted.
In the direction of the arrow (shown in the horizontal direction in FIG. 4). As shown in FIG. 5 showing each step of the press working which sequentially proceeds from the state of FIG. 4, after the work W is carried into the mold A ', the ram 82 is lowered in the direction of the arrow, and the press such as hemming is performed. Done. Thereafter, the die A 'is opened by raising the ram 82 in the direction of the arrow while holding the upper die 81, and the work W for which the pressing operation has been completed is moved in the direction of the arrow (shown in the horizontal direction in FIG. 5). It is carried out. Next, the ram 82 is lowered in the direction of the arrow to bring the upper mold 81 into contact with the lower mold 83, and the mold A 'is closed to make the mold A' replaceable. Cancel (). Then, the ram 82 is raised to the intermediate position in the direction of the arrow, and after moving the mold A 'in the direction of the arrow, the mold B' for the different kind of workpiece W 'is carried into the press machine 80. Next, the ram 82 is lowered (), and the ram 82 grips the upper die 85 of the die B '. Thereafter, the ram 82 is raised in the direction opposite to the arrow to open the die B' and open the work W '. And the work W 'is pressed.

[0003]

In such conventional press working, it is necessary to raise and lower the ram 82 three times at the time of die replacement, and it takes about 90 seconds for the die replacement work. For this reason, when press work is performed on different works W and W 'using a single press machine 80 in a single press working line, the above-mentioned mold changing operation requires a long time.
There is a problem that productivity is reduced. For this reason, conventionally, in order to press different types of work, one type of work W
There was no choice but to provide multiple dedicated lines for processing only or to adopt a lot production method. SUMMARY OF THE INVENTION An object of the present invention is to provide a pressing method capable of exchanging a die of a press machine in a short time in order to solve such problems in the conventional technology.

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a press machine in which a press-completed work A is supplied to a press machine while being held in a mold A ', and the mold A' is opened to open the mold A '. After taking out the pressed work A inside the work A, the same work as the work A but not yet pressed is put into the mold A ', the mold A' is closed and pressed, and then the work is put into the closed mold A '. A first step of retracting the work A with the work A inserted;
The press-completed work B is supplied to a press machine while being placed in the mold B ', and after the mold B' is opened and the pressed work B in the mold B 'is taken out, the work B is the same as the work B. A second step of placing the unpressed work in the mold B ', closing the mold B' and pressing, and then retracting the work B while the work B is in the closed mold B '; First
This is a pressing method for alternately processing different kinds of workpieces by alternately repeating the process and the second process.

[0005]

According to the present invention, the work A which has been pressed in the first step is supplied to a press machine while being placed in the mold A ', and the work A which has been pressed from the mold A' is opened by opening the mold A '. Then, the same type of work A which has not been pressed is put into the mold A ', the mold A' is closed and pressed, and then the work A is retracted while the work A is kept in the mold A '. Next, the process proceeds to the second step, in which the pressed work B is supplied to the press while keeping it in the mold B ', and after opening the mold B' and taking out the pressed work B from the mold B ', the press B is pressed. An unfinished work B of the same type is placed in a mold B ', and after closing and pressing the mold B', the work B is retracted with the work B kept in the mold B '. The first and second steps are combined in an appropriate order. For example, A → B → A → B
May be alternately repeated, or there are cases such as A → A → B → B. It is also possible to use the third and fourth works and the corresponding molds as in A → B → C → A → B → C. In this case, only two mold opening / closing operations are performed for one mold exchange. When the molds A 'and B' are opened and the processed works A and B are taken out, the unprocessed works A and B are removed.
, The number of times of opening and closing of the molds A 'and B' required for replacing the molds A 'and B' is reduced, and the molds A 'and B' are reduced.
B 'can be exchanged in a short time.

[0006]

Embodiments of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. The following embodiment is an example embodying the present invention and is not intended to limit the technical scope of the present invention. Here, FIG. 1 is a process diagram of a first process when hemming, for example, an automobile door panel by the press method of the present invention, and FIG. 2 is a process diagram of the second process. The pressing method of the present invention includes a first step of pressing the work A with the mold A 'and a second step of pressing the work B with the mold B'.
It is characterized in that different types of workpieces A and B are alternately pressed by being alternately repeated. As shown in FIG. 1, in the first step, the work A is hemmed using the door outer plate for a certain vehicle type a as the work A. First, a mold A 'in which a work A, which has been hemmed (pressed) in advance, is loaded into the press machine 10, and the ram 1 of the press machine 10 is loaded.
1 is lowered from the intermediate raised position in the direction of the arrow, and the upper mold 20 of the mold A 'is gripped by the ram 11 (). Thereafter, the ram 11 is raised in the direction of the arrow, and the upper mold 20 is lifted. After the mold A 'has been released, the hemmed work A is unloaded from the mold A' in the direction of the arrow, and the same kind of unfinished work A is carried in the direction of the arrow. Thereafter, the ram 11 is lowered in the direction of the arrow, and the work A is subjected to hemming, for example. After the completion of the press working, the grip of the upper die 20 by the ram 11 is released (), and the ram 11 is raised in the direction of the arrow. After that, the mold A 'is moved in the direction of the arrow while the pressed work A is placed in the mold A', and the work A is retracted.

After the completion of the first step as described above, when the door B for the vehicle type b different from the work A is used as the different kind of work B, the work B is hemmed (second step).
think of. In the second step, as shown in FIG. 2, a mold B 'containing a work B which has been hemmed (pressed) in advance is loaded into the press machine 10 as in the first step, and The ram 11 of the machine 10 is lowered from the intermediate raised position in the direction of the arrow, and the upper die 30 of the die B 'is gripped by the ram 11 (). Thereafter, the ram 11 is raised in the direction of the arrow, and the upper die 30 is lifted. After the mold B 'is released, the hemmed work B is unloaded from the mold B' in the direction of the arrow, and the same kind of work B not yet hemmed is loaded in the direction of the arrow. afterwards,
By lowering the ram 11 in the direction of the arrow, the work B is subjected to press working such as hemming. After the completion of the press working, the gripping of the upper die 30 by the ram 11 is released (), and the ram 11 is raised in the direction of the arrow. Thereafter, the mold B 'is moved in the direction of the arrow while the pressed work B is still in the mold B', and the work B is retracted.

In the pressing method of this embodiment, the first and second steps are alternately repeated so that one press machine 10 can dissimilar workpieces A and B such as door skins for different types of vehicles. Press working alternately. As described above, in order to press different types of workpieces A and B alternately by one press machine 10, the dies A 'and B are kept in a state where the pressed workpieces A and B are put in the dies A' and B '. 'Are exchanged. That is,
First, the pressed work A or B is supplied to the press machine 10 while being placed in the mold A ′ or B ′, and immediately after the processed work A or B is taken out from the mold A ′ or B ′, Unworked workpieces A and B are supplied, and molds A 'and
After closing work B 'and pressing works A and B, molds A' and
The molds A 'and B' are exchanged while the pressed works A and B are kept in B '. For this reason, as compared with the conventional case where the pressed work is once taken out of the mold and then the upper and lower molds are abutted and the molds are exchanged, the molds A ′,
The number of times of opening and closing the molds A 'and B' required to replace B 'is reduced from three to two. According to the experiments of the present inventors, the mold changing operation, which conventionally required about 90 seconds, can be reduced to about 50 to 60 seconds according to the method of the present invention. Therefore, different types of workpieces A and B can be efficiently and alternately pressed on a single line using one press machine 10, and the productivity of press processing for small-lot production of various kinds can be improved. It should be noted that the present invention is not limited to the above embodiment, but can be variously modified. For example, the work is exchanged as A → A → B → B, or A → A → B → A
→ A, A → B → C → A → B → C, or exchange in an appropriate order. Further, in the above embodiment, the present invention is applied to the case where hemming is applied to a door outer plate for an automobile. However, the present invention can be applied to other press working.

[0009]

Since the pressing method according to the present invention is configured as described above, the pressed work A, B
Is supplied to the press machine with the molds A 'and B' placed therein, and after the molds A 'and B' are opened to remove the pressed works A and B from the molds A 'and B', the press is not completed. After placing the same type of work A, B in the molds A ', B', closing the molds A ', B' and pressing them, the work A, B with the works A, B in the molds A ', B' B is retracted, and the first step and the second step
By alternately repeating the steps and pressing the different kinds of workpieces A and B alternately, the number of times of opening and closing the molds A 'and B' required for moving the molds A 'and B' can be reduced. For this reason, the time required for exchanging the dies A 'and B' can be shortened, and the productivity in alternately pressing different types of workpieces A and B with one press machine can be improved.

[Brief description of the drawings]

FIG. 1 is a process diagram of a first process in a pressing method according to an embodiment of the present invention.

FIG. 2 is a process diagram of a second step in the press method.

FIG. 3 is a plan view of a press used in a conventional press method.

FIG. 4 is a process diagram showing a state at the start of press working in a conventional press method.

FIG. 5 is a process chart showing the steps after FIG. 4 in the conventional pressing method.

[Explanation of symbols]

 10. Press machine 20, 30 ... Upper mold A, B ... Work A ', B' ... Mold

Claims (1)

(57) [Claims] 1. A press-completed work A is supplied to a press machine while being placed in a mold A ', and after the mold A' is opened and a pressed work A in the mold A 'is taken out, the work A is A first step of putting the same unworked work into the mold A ', closing the mold A' and pressing, and then retracting the work A while keeping the work A in the closed mold A '; ,
The press-completed work B is supplied to a press machine while being placed in the mold B ', and after the mold B' is opened and the pressed work B in the mold B 'is taken out, the work B is the same as the work B. A second step of placing the unpressed work in the mold B ', closing the mold B' and pressing, and then retracting the work B while the work B is in the closed mold B '; First
A pressing method in which different processes are alternately processed by repeating the process and the second process in an appropriate order.