JPH10166071A - Lubricant feeding method and double action press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a punch face and a material face to be automatically coated with lubricating oil by feeding to the press face of the punch a lubricant supplied from a blank holder side, through a grooved connecting path formed on the sliding face of a wear plate along the sliding direction. SOLUTION: Lubricant paths 5a, 5b, 5c provided on a blank holder 4 side are connected to those 6a, 6b, 6c provided on the punch 3 side, by means of grooved connecting paths 10a, 10b, 10c, in accordance with the length and the forming position of the grooved connecting paths 10a, 10b, 10c, regardless of the relative position of the punch 3 and the blank holder 4, or only during the time when the punch 3 and the blank holder 4 are in a prescribed relative positional relation with each other. Consequently, for example, a lubricant from a lubricant feeding device 8 arranged on the outside of a press 1 is smoothly supplied from the blank holder side to the punch side; also, the quantity of lubricating oil and the timing of the supply can be adjusted by changing the length and the forming position of the grooved connecting path.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for applying a lubricant to a die surface or a material surface during a press operation. The present invention also relates to a double-action press device having a blank holder on the outer peripheral side of a punch. The present invention relates to a lubricant supply method capable of smoothly supplying a lubricant from a side of a blank holder that operates to a punch side, and a double action press device employing such a supply method.

[0002]

In the press molding operation, as described above, a lubricant is applied to the mold surface or the material surface in order to improve the slip between the material and the mold and to secure good moldability. May be applied.

[0003] As an apparatus used for such lubricant application, for example, a lubricating oil pump comprising a cylinder and a piston is attached to a lower die of a press device, and lubricating oil pumped by using the vertical movement of the upper die relative to the lower die. Japanese Patent Application Laid-Open No. 56-86629 discloses an oil supply device in which the oil is injected from the press surface of the upper die through a lubrication passage formed in the upper die of the press.

However, in a double action press device having a blank holder on the outer peripheral side of the punch, since the punch and the blank holder operate independently, a lubricant supply pipe is provided between the punch and the blank holder. There is a problem that the piping cannot be provided, and the lubricant cannot be supplied from the blank holder side to the punch side. To solve such a problem, a conventional double action press device automatically applies a lubricant. Had to be a challenge.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems in a conventional double action press apparatus, and smoothly supplies a lubricant from a side of a blank holder which operates independently of each other to a side of a punch. And a double action press device which can automatically apply a lubricant to a mold surface and a material surface of a punch by adopting such a lubricant supply method. It is intended to be.

[0006]

According to a first aspect of the present invention, there is provided a lubricant supply method for supplying a lubricant to a press surface of a double action press apparatus having a blank holder outside a punch. Between the holders, a wear plate attached to the punch and the blank holder and sliding with each other in accordance with the relative movement of the punch and the blank holder is provided, and the lubricant supplied from the blank holder side is slid on the wear plate. It is characterized in that it is configured to supply to the press surface of the punch through a groove-shaped connecting path formed along the sliding direction on the moving surface, and the configuration of such a lubricant supply method in a double action press device is described above. This is a means for solving the conventional problem described above.

A double action press device according to a second aspect of the present invention is a double action press device having a blank holder outside a punch, wherein the double action press device is attached to the punch and the blank holder between the punch and the blank holder. , A wear plate that slides with each other in accordance with the relative movement of the punch and the blank holder. The blank holder-side wear plate is formed with a holder-side flow passage through which the lubricant flows, and slides with the punch-side wear plate. The punch-side wear plate is formed with a punch-side flow passage communicating with the lubricant flow path opened on the press surface of the punch, and is opened on the sliding surface with the blank holder-side wear plate. In addition, at least one sliding surface of the wear plate is The groove-shaped connecting path connecting the holder-side flow path and the punch-side flow path based on the movement is formed along the sliding direction, and the double action press device according to the present invention is characterized in that: According to an embodiment of the present invention, in the pressing device, the wear plate has a plurality of holder-side flow passages and a punch-side flow passage, and the position and / or length of the groove-shaped connection passage connecting these are respectively. It is characterized in that it is different, and such a configuration in the double action press device is used as means for solving the above-mentioned conventional problems.

[0008]

In the lubricant supply method according to the first aspect of the present invention, two wear plates are provided between the punch and the blank holder so as to slide relative to each other in accordance with the relative movement of the punch and the blank holder. Since the lubricant supplied from the blank holder side is supplied to the press surface of the punch via a groove-shaped connecting passage formed on the sliding surface of the wear plate along the sliding direction, the groove shape is formed. Depending on the length and formation position of the connection path, regardless of the relative position of the punch and the blank holder, or only while the punch and the blank holder are in a predetermined relative positional relationship, the lubricant passage provided on the blank holder side and Since the lubricant passage provided on the punch side is connected by the groove-shaped connection passage, for example, the lubricant from the lubricant supply device provided outside the press device is poured from the blank holder side. H can be smoothly fed to the front side, and by changing the length and the forming position of the groove-shaped connecting path, the amount of the lubricant and the timing of the supply can be adjusted. The effect is brought.

A double action press apparatus according to a second aspect of the present invention is provided with two wear plates having a groove-shaped connecting path between sliding surfaces between a punch and a blank holder. Since it is adopted, the lubricant passage on the blank holder side, the lubricant passage on the punch side,
That is, since the lubricant flow path is connected by the groove-shaped connection path of the wear plate, the lubricant supplied from the supply device is smoothly fed from the blank holder side to the punch side, and the press surface and the material of the punch are pressed. 2. The lubricant supply method according to claim 1, wherein the lubricant can be applied to the surface, and the amount and timing of supply of the lubricant can be adjusted by changing the length and the formation position of the groove-shaped connection path. It has the same excellent effect as described above. Furthermore, in the press apparatus according to claim 3 as an embodiment of the double action press apparatus according to the present invention,
Since each of the wear plates has a plurality of holder-side flow passages and a punch-side flow passage, and has groove-shaped connection passages having different positions and / or lengths, the holder-side flow passages are formed based on, for example, valve operation. The selection has a further excellent effect that the lubricant application conditions can be easily changed and adjusted even during operation.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

FIGS. 1 to 3 are views for explaining an embodiment of a double action press apparatus according to the present invention, and FIG. 1 is a longitudinal sectional view showing the structure of the double action press apparatus.

A double action press 1 shown in FIG.
Are arranged on a die 2 fixed on a base, a punch 3 moving up and down with respect to the die 2, and an outer peripheral portion of the punch 3,
It mainly consists of a blank holder 4 which descends slightly before the punch 3 and presses an end of a panel (not shown) placed on the die 2 to prevent wrinkles from occurring. Have been.

[0013] Between the blank holder 4 and the punch 3, 2
A plurality of wear plates, that is, a blank holder side wear plate 5 fixed to the blank holder 4 side and a punch side wear plate 6 fixed to the punch 3 side are provided. They slide with each other based on independent vertical movements.

The blank holder side wear plate 5 includes:
In this embodiment, as shown in FIG. 2A, three holder side flow paths 5a, 5b, 5c are formed so as to penetrate the wear plate 5, and these holder side flow paths 5a, 5a, 5b and 5c communicate with the lubricant supply pipe 7 through through holes 4a, 4b and 4c (see FIG. 3) formed in the blank holder 4, respectively. The lubricant supply pipe 7
The lubricant supply device 8 is connected to the lubricant supply device 8.
The lubricating oil in the through holes 4a, 4
b, 4c, the holder side flow passage 5
a, 5b, and 5c.

On the other hand, the punch-side wear plate 6 has different lengths at the same intervals as the holder-side flow passages 5a, 5b, 5c provided in the blank holder-side wear plate 5, as shown in FIG. 2B. Three grooves are formed in the sliding direction, that is, in the vertical direction, and the groove-shaped connecting paths 10a, 10b, 10
c. Then, each of the groove-shaped connection paths 10a, 10b,
At the upper end of 10c, punch-side flow paths 6a, 6b, 6c penetrating the back side are provided, and the punch-side flow paths 6a, 6a,
6b, 6c are lubricant flow paths 11 arranged in the punch 3.
Is in communication with The other end of the lubricant flow path 11 is open to the press surface 3a of the punch 3, and the lubricant supplied from one of the holder side flow paths 5a, 5b, 5c by operating the valve 9 is used as a blank. In accordance with the relative position between the holder 4 and the punch 3, the liquid is discharged to the press surface 3a of the punch 3 through one of the groove-shaped connecting paths 10a, 10b, and 10c.

The wear plate 5 on the blank holder side
As shown in FIG. 2 (a), urethane seals 12 are respectively mounted around the holder side flow passages 5a, 5b, 5c on the sliding surface, and are supplied from the blank holder 4 side. The lubricating oil is prevented from leaking from between the sliding surfaces of the wear plates 5 and 6.

In the double action press apparatus 1 having such a structure, a work panel (not shown) is placed on the die 2 and press forming is started. When the press forming is started, the state shown in FIG. As shown in (1), the blank holder 4 first descends and presses the peripheral edge of the panel to be processed onto the die 2. In this state, no lubricating oil is supplied because each holder-side flow passage of the blank holder-side wear plate 5 and each groove-shaped connection passage of the punch-side wear plate 6 are not connected.

Then, from the state shown in FIG. 3A, when the punch 3 starts to descend and reaches a predetermined position, first, the lower end of the first groove-shaped connecting path 10a of the punch-side wear plate 6 is blanked. It coincides with the first holder-side flow passage 5a of the holder-side wear plate 5. At this time, if the first flow passage 5a is selected in advance from among the holder-side flow passages of the wear plate 5 by operating the valve 9, the lubricating oil in the lubricant supply device 8 is supplied to the lubricant supply pipe. 7, valve 9,
The through hole 4a of the blank holder 4, the holder side flow passage 5a,
The fluid is discharged from the press surface 3a of the punch 3 through the groove-shaped connection passage 10a, the punch-side flow passage 6a, and the lubricant flow passage 11, and the lubricating oil is applied to the mold surface of the press device and the panel to be processed.

Then, the discharge of the lubricating oil is continued until the punch 3 reaches the bottom dead center, as shown in FIG.

At this time, if the second or third flow passage 5b or 5c is selected from the holder-side flow passages of the blank holder-side wear plate 5, the length is longer than the groove-shaped connection passage 10a. Since the lubricating oil is supplied via the short groove-shaped connection path 10b or 10c, the discharge start time of the lubricating oil can be delayed, and by operating the valve 9, the degree of processing and the material of the panel to be processed can be reduced. The application amount and timing of the lubricating oil can be adjusted according to the conditions.

FIG. 4 shows another example of the groove-shaped connecting passages 10a to 10c formed in the punch-side wear plate 6. In this embodiment, the groove-shaped connecting passages 10a to 10c are used.
By changing the position along with the length of a to 10c, more complicated lubricant supply control can be performed.

That is, the first groove-shaped connecting path 10a is formed to be the longest as shown in FIG. 4 (a), and the second groove-shaped connecting path 10b is formed as shown in FIG. 4 (b). 4C, which is shorter than that, and the third groove-shaped connection path 10c is
As shown in FIG. 7, the shortest portion is formed at a position shifted downward with the punch-side flow passage 6c.

Therefore, when the lubricant supply pipe 7 is communicated with the holder side flow passage 5a by operating the valve 9, the punch 3 starts to descend as shown by the symbol A in FIG. After that, while the lubricant continues to be discharged until the punch 3 reaches the bottom dead center, if the lubricant supply pipe 7 is connected to the holder side flow passage 5b, the punch 3 is moved to the bottom dead center. Immediately before the arrival, the discharge of the lubricant is started (symbol B), and when the holder side flow path 5c is selected, the discharge of the lubricant is performed a while after the punch 3 starts descending, as indicated by the symbol C. Is started and the lubricant stops before the press forming is completed, and only the valve 9 is operated, so that various discharge patterns of the lubricant can be changed even during the pressing operation.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a structure of a double action press device according to one embodiment of the present invention.

FIG. 2A is a perspective view showing a shape of a sliding surface of a wear plate on a blank holder side of the double action press device shown in FIG. 1; (B) It is a perspective view which shows the shape of the sliding surface of the punch side wear plate of the double action press apparatus shown in FIG.

FIG. 3 (a) is an operation explanatory view showing a state where a blank holder is lowered in the double action press device shown in FIG. 1; (B) Operation | movement explanatory drawing which shows the state in which the punch fell following the blank holder in the double action press apparatus shown in FIG.

FIGS. 4A to 4C are cross-sectional views showing other examples of the shape of the groove-shaped connecting path provided on the sliding surface of the punch-side wear plate.

FIG. 5 is a time chart showing a lubricating oil supply and stop pattern by a groove-shaped connecting passage having a shape shown in FIGS. 4 (a) to 4 (c).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Double action press apparatus 3 Punch 4 Blank holder 5 Blank holder side wear plate 5a, 5b, 5c Holder side flow path 6 Punch side wear plate 6a, 6b, 6c Punch side flow path 10a, 10b, 10c Groove connection path 11 Lubrication Agent flow path

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B30B 15/00 B30B 15/00 F

Claims (3)

[Claims] When a lubricant is supplied to a press surface of a double action press device having a blank holder on the outside of a punch, the punch and the blank holder are attached between the punch and the blank holder, respectively. A wear plate that slides on each other in accordance with the relative movement of the blank plate is provided, and the lubricant supplied from the blank holder side is supplied to the sliding surface of the wear plate via a groove-shaped connecting path formed along the sliding direction. A lubricant supply method, wherein the lubricant is supplied to a press surface of a punch. 2. A double-action press device having a blank holder outside a punch, wherein the punch and the blank holder are respectively mounted between the punch and the blank holder, and are mutually attached according to the relative movement of the punch and the blank holder. The wear plate has a sliding wear plate, a holder-side flow passage through which a lubricant flows is formed in the blank holder-side wear plate, and is opened on a sliding surface with the punch-side wear plate. A punch-side flow passage communicating with a lubricant flow path opened on the press surface of the punch is formed, and is opened on a sliding surface with the blank holder-side wear plate. On the surface, the holder side flow path and the punch side flow path are connected based on the relative movement of the punch and the blank holder Double action press device grooved coupling path, characterized in that it is formed along the sliding direction that. 3. The wear plate has a plurality of holder-side flow passages and a punch-side flow passage, and the positions and / or lengths of the groove-shaped connection passages connecting these are different from each other. The double action press device according to claim 2, wherein