JPS61176428A - Press technique and its device - Google Patents

Abstract

PURPOSE:To prevent the noise generation at forming time and to prevent the vibration accompanying the noise as well by performing a press forming with the state of pinching with pressing by interposing a resin material on at least one part of the pinching face of the pinching face of the outer peripheral part of steel plate. CONSTITUTION:A steel plate 1 is placed on the blank holder 3 whih places a vinyl film sheet 5 and another vinyl film sheet 5 is placed on the pinching face 12 of the upper side of the steel sheet 1. Both pinching faces 12, 13 of the steel sheet 1 are pinched with pressing by the press face 23 of the upper die 2 and the press face 32 of the blank holder 3 by inserting the upper and lower vinyl film sheets 5, 5 by moving to the upper part the blank holder 3 then. The upper die 2 and blank holder 3 are moved to the lower part synchronously with the state of pinching with pressing and the forming part 11 of the steel sheet 1 is formed by the upper die 2 and lower die 4. The friction is therefore less due to the vinyl film sheets 5, 5 and a big noise is not caused.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a press method and apparatus for forming a steel plate by pressing a mold into contact with the steel plate using hydraulic pressure.

(Prior Art) As a conventional press method and its apparatus, for example, the one shown in FIG. 6 is known.

This hydraulic press method and its device press a steel plate OO into a metal upper mold 02 which is moved up and down by a hydraulic piston 01 and Of.
and a metal blank holder 04 provided at the upper end of the cushion pin 03 that is moved up and down by hydraulic pressure.
(Problems to be Solved by the Invention) However, according to this conventional hydraulic press method and its device, the steel plate When the steel plate is drawn toward the mold surface during press forming, the metal of the upper mold and blank holder and the clamping surface of the steel plate rub against each other, and this friction generates a loud noise and However, there was a problem in that vibrations were generated and were noisy, and the vibrations could sometimes be transmitted to the vicinity of the factory and cause a nuisance.

Additionally, in order to reduce friction between the upper die, steel plate, and blank holder, oil was applied to the steel plate.
There is also the problem that the oil stains the area around the press equipment, the hands and clothes of the workers.

(Means for Solving the Problems) The present invention aims to solve the above-mentioned problems, and as a means for achieving the purpose, the first invention of the present invention provides the following: Formed portion of steel plate Among the clamping surfaces formed on the outer periphery of the holder, at least one of the clamping surfaces is interposed with a resin material to be pressed and clamped, and press molding is performed in the pressed and clamped state.

In the second invention, a pair of upper and lower molds having mold surfaces for forming a steel plate are provided, a blank holder is provided that presses and clamps the steel plate with the periphery of the mold surface of the upper mold, and the upper In a press device in which a pressing surface for pressing the steel plate is formed on a mold and a blank holder, at least one of the pressing surfaces is fixed to the upper mold or the blank holder with a resin material.

Note that the resin material referred to herein refers to resins with good slippage such as vinyl, polyethylene, and Teflon, and resins with high elasticity such as rubber, and further includes natural rubber.

(Function) Therefore, according to the hydraulic press method and its device of the present invention, when a steel plate is drawn in during press forming, at least one of the clamping surface and the pressing side of the steel plate rubs against each other via the resin material. In addition, if the resin material is slippery,
Friction between the steel plate and the pressing side can be reduced, and if the resin material is highly elastic, vibrations caused by friction between the steel plate and the pressing side can be absorbed.

(Example) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

First, the configuration of the embodiment of the first invention shown in FIGS. 1 to 4 will be described.

FIG. 1 is a partially sectional side view showing the entire hydraulic press apparatus A according to the first embodiment of the invention.

1 is a steel plate that is press-formed, and includes a formed part 11 to be formed, an upper clamping surface 12 and a lower clamping surface formed on the outer circumference of the molded part 11 and clamped by pressure. It has surfaces 13, 13.

Reference numeral 2 denotes an upper mold, which is suspended from the upper part of the hydraulic press device A by a press piston 21.21. and pressing surfaces 23, 23 for pressing and clamping the upper clamping surfaces 12, 12 from above, and is moved in the vertical direction by the press piston 21.

Reference numeral 3.3 denotes a blank holder, which is provided at the upper end of the die cushion pin 31 provided on the base AI of the hydraulic press device A, and is mounted on the upper surface of the blank holder 3 to hold the lower side of the steel plate l. A pressing surface 32 for pressing and clamping the surfaces 13, 13 is formed.

Note that the die cushion pin 31 is moved up and down by a hydraulic piston (not shown).

A lower die 4 is fixed to the base A1, and a forming die surface 41 for forming the portion 11 of the steel plate I is formed on the upper side of the lower die 4.

5,5 A vinyl film sheet as a ttmm material, comprising an upper clamping surface 12 of the steel plate 1 and an upper die 2.
and the lower clamping surface 13 of the steel plate l.
and the pressing surface 32 of the blank holder 3, and this vinyl film sheet is suitable.

Next, the operation of the hydraulic press device A and the construction method will be explained.

First, the steel plate l is placed on the blank holder 3 on which the vinyl film sheet 5 is placed on the pressing surface 32, and the steel plate l
Another vinyl film sheet 5 is placed on the upper clamping surface 12 of the .

Next, the blank holder 3 is moved upward as shown in FIG. Film sheets 5, 5 are interposed and pressed and clamped.

Next, as shown in FIGS. 3 and 4, the upper die 2 and the blank holder 3 are moved downward in synchronization with each other in the above-mentioned pressing and clamping state, and the upper die 2 and the lower die 4 are used to hold the steel plate Molded part 1 of
1 is press-molded.

Incidentally, during the above press forming, the steel plate l is placed on the mold surface 22.
However, since the vinyl film sheets 5, 5 are interposed between the pressing surfaces 23, 32 and the steel plate 1, there is little friction between the two and no loud noise is generated.

Next, the hydraulic press device B of the second embodiment of the invention shown in FIG.
I will explain about it.

The pressing surface 23 of the upper mold 20 is formed of a resin material 50 embedded in the upper mold 20 and fixed thereto.

This resin material 50 is made of polychlorotrifluoroethylene and has excellent wear resistance.

Further, the pressing surface 32 of the blank holder 30 is also formed of a resin material 50 embedded in the blank holder 30 and fixed thereto.

Therefore, after the steel plate 1 is pressed and held between the pressing surfaces 23 and 32, it is press-formed using the dies 2 and 4.

Note that the other configurations and operations are the same as those of the device A of the first embodiment of the invention, so the same reference numerals are given and the explanation will be omitted.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and even if there are design changes within the scope of the invention, the present invention include.

For example, the resin material is not limited to vinyl sheets or polychlorotrifluoroethylene, but may also be other resins or rubbers. When rubber is used as the resin material, friction occurs between the rubber and the steel plate. The vibrations caused are absorbed by the rubber resin material, so no loud noise is generated.

Further, in the second embodiment of the invention, the resin material 50 is fixed to both the pressing surfaces 23, 32, but it may be fixed to only one of them.

(Effects of the Invention) J: As mentioned above, according to the present invention, it is possible to prevent friction between the steel plate and the pressing side when drawing the steel plate during press forming, or to absorb vibrations. This makes it possible to prevent noise from being generated during press forming.
As a result, it is possible to prevent vibrations accompanying noise generation from occurring.

In addition, since no oil is used as a lubricant, it is clean and free from oil stains.

Further, in the first embodiment of the invention, since the conventional device can be used as is, there is no need for modification or new manufacturing costs, which is economically advantageous.

Furthermore, in the second embodiment of the invention, it is not necessary to place a resin material such as a vinyl film sheet on the steel plate every time pressing is performed, so that productivity can be improved.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional side view showing a hydraulic press apparatus A according to an embodiment employing the hydraulic press construction method of the first invention, and FIGS.
The figure is a sectional view showing the operating state of the main parts of the hydraulic press device A.
FIG. 5 is a sectional view showing essential parts of a hydraulic press apparatus B according to a second embodiment of the invention, and FIG. 6 is a sectional view showing a conventional example. l... Steel plate 2... Upper die 3... Blank holder 4... Lower die 5... Vinyl film sheet (resin material) 11...
Molded part 12...Upper clamping surface 13...Lower clamping surface 23.32...Press surface 50...Resin material

Claims (1)

[Scope of Claims] 1) A resin material is interposed on at least one of the clamping surfaces formed on the outer periphery of the part to be formed of the steel plate, and the sheet is pressed and clamped, and press forming is performed in the pressed and clamped state. The press method is characterized by: 2) A pair of upper and lower molds having mold surfaces for forming a steel plate are provided, a blank holder is provided that presses and clamps the steel plate with the periphery of the mold surface of the upper mold, and the upper mold and the blank holder are provided. A press device in which a pressing surface for pressing the steel plate is formed, wherein at least one of the pressing surfaces is formed by fixing a resin material to an upper die or a blank holder.