JPH0321834Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a press device used for drawing thin steel plates.

This type of press device is generally configured to complete the drawing process through one step of pressure treatment.

However, in the drawing process of thin steel sheets as described above, the maximum pressing force is only required in the final pressing stage to finish the material into a predetermined shape; Does not require pressure.

Therefore, in this type of conventional press equipment, the above-mentioned pressure treatment process is divided into two steps, primary pressing and secondary pressing, and in the primary pressing, the pressing force exerted by the pressing means on the material is reduced. At the same time, the feed speed is increased to perform rough machining of the material, and in the secondary pressurization, the pressurizing force of the same pressurizing means used for the primary pressurizing is increased to perform the final finishing, thereby reducing the pressurizing time. It was devised to shorten the time and reduce waste of pressurizing energy.

However, as mentioned above, the pressure treatment process is
In the case of an apparatus that is divided into stages and the operating conditions of one pressurizing means are made different depending on each step before and after each step, the disadvantage is that the configuration becomes complicated and pressure control becomes difficult.

The object of this invention is to provide a press device which eliminates the above-mentioned drawbacks of the conventional example, suppresses waste of pressurizing energy, has a simple configuration, and can easily control pressurization.

An embodiment of this invention will be described in detail below with reference to FIGS. 1 to 4.

The press device of this embodiment includes a hydraulic cylinder 3 for preliminary pressurization, which is connected to an upper plate 1 to which a male die is attached, and drives the upper plate 1 up and down toward a lower plate 2 facing it; A stopper 4 is provided near the cylinder 3 to once restrict the retreat of the cylinder 3 from a predetermined advanced position after it has advanced into the cylinder operating area and completed preliminary pressurization, and a pressurizing force increaser connected to the lower plate 2 to which the female die is attached. A double crank mechanism 5,
It is equipped with a hydraulic cylinder 6 for main pressurization that drives the lower plate 2 up and down toward the upper plate 1 via the crank mechanism 5, and performs rough machining of the material by pushing down the upper plate 1 with the hydraulic cylinder 3, Next, hydraulic cylinder 6
The lower plate 2 is pushed up via the crank mechanism 5 by the drive of the lower plate 2 to perform finishing processing.

The hydraulic cylinder 3 for preliminary pressurization is attached to the support frame 6'
The piston rod 3a is held in a vertical position by an upper support stand 7, and the upper plate 1 is connected to the lower end of the piston rod 3a.

The stopper 4 includes a stopper hydraulic cylinder 8 horizontally attached to one side of the base 7a of the upper support base 7, and a locking plate 9 horizontally movable provided on the lower surface of the base 7a. Then, hydraulic cylinder 8
The locking plate 9 connected to the piston rod of the cylinder 8 is pushed out into the operating range of the hydraulic cylinder 3 by the advancing movement of the cylinder 8, and the locking plate 9 catches the upper plate 1, thereby preventing the upward movement of the upper plate 1. It is configured to prevent The locking plate 9 is supported by guide rails 10, 10 provided on the lower surface of the base plate 7a, so that the locking plate 9 can be slid in the operating direction of the hydraulic cylinder 8.

The lower board 2 is held at a position facing the upper board 1 by a lower support stand 11 of a support frame 6'. A guide shaft 12 is provided vertically at the center of the lower surface of the lower plate 2, and the guide shaft 12 is inserted into a guide hole 13 formed in the base plate 11a of the lower support stand 11, so that the lower plate 2 can move up and down in the vertical direction. I have to.

The crank mechanism 5 for multiplying the pressing force includes a lever 15 pivotally mounted on the base 14 of the support frame 6', and a connecting rod 16 connecting one end of the lever 15 and the lower end of the guide shaft 12. The crank mechanism 5 and the main pressurizing hydraulic cylinder 6 are connected by pivoting the other end of the lever 15 and the piston rod 6a of the hydraulic cylinder 6.

The pressurizing hydraulic cylinder 6 has its base end pivotally attached to the lower surface side of the base plate 11a of the lower support stand 11 and is vertically provided.

In FIG. 1, reference numeral 17 denotes a hydraulic unit disposed on one side of the support frame 6, which is connected to each hydraulic cylinder 3, 6, and 8 via a pipe (not shown).
18 is a control panel for electrically controlling the drive of this device.

In addition, the stroke amount of the upper plate 1 and lower plate 2 is as follows.
Base plates 7a and 11 of the upper support stand 7 and the lower support stand 11
Detecting elements such as limit switches and proximity switches are installed at appropriate locations such as a or the pillars 7b of the upper support base 7, and these detecting elements detect the lowered and raised positions of the upper plate 1 and lower plate 2, The detection signal is used to control the operation of each cylinder by turning it on and off.

The operation of this press device will be described next, taking as an example the case of drawing a thin steel plate material.

While attaching the male mold to the bottom of the upper panel 1, the lower panel 2
Attach a female mold to the top of the . A thin steel plate blank B shown in FIG. 4a is set on the female die of the lower plate 2. In the initial state before starting, the upper plate 1 is retracted upward and the lower plate 2 is retracted downward.

When the apparatus is started after setting the blank B, the preliminary pressurizing hydraulic cylinder 3 starts to be driven and the upper plate 1 is lowered. When the upper plate 1 is pushed down to the point where the blank B deforms under pressure as shown in FIG. 4b, a detection element (not shown) detects the lowered position and the cylinder 3 stops driving. This completes the rough machining.

Then, the stopper hydraulic cylinder 8 starts driving, and the locking plate 9 is pushed out into the operating range of the piston rod 3a of the hydraulic cylinder 3, thereby preventing the upper plate 1 from rising.

After this, the main pressurizing hydraulic cylinder 6 is driven,
As the piston rod 6a advances, the pressing force of the hydraulic cylinder 6 is doubled and transmitted to the lower plate 2 via the crank mechanism 5, and the lower plate 2 is pushed upward by about 10 mm. As a result, the blank B is finished processed as shown in FIG. 4c, and the main processing is completed.

Thereafter, the lower plate 2 is lowered to the original initial position by driving the hydraulic cylinder 6 in the opposite direction and stopped. On the other hand, regarding the upper panel 1, after the stopper hydraulic cylinder 8 is driven in the opposite direction and the restriction by the locking plate 9 is released, the pre-pressurizing hydraulic cylinder 6 is driven in the opposite direction. 1 is retracted to its original upper position and one cycle of operation is completed.

The male and female molds may be attached to the upper panel 1 and the lower panel 2, contrary to the above case, in which case the female mold is attached to the upper panel 1 and the female mold is attached to the lower panel 2.

As described above, this device is a press device that performs pressure forming of a material in two processes: preliminary pressurization and main pressurization, and separate cylinders are prepared for each pressurization process. In this pressurization, the pressurizing force of the cylinder is multiplied via a crank mechanism and applied to the mold mounting board, so there is no need to use a large capacity cylinder, and it is possible to suppress waste of pressurizing energy, and also can be configured compactly. In addition, since the two pressurization processes are performed by driving separate cylinders, it is easy to set different pressurization conditions for the front and rear stages, and it is also easy to control switching from the front stage to the rear stage. The control mechanism also becomes simpler. Furthermore, the die mounting plate (upper plate 1) that is pushed out during the preliminary pressurization is caught by a stopper during the main pressurization and its retreat is regulated, so that the pressurizing force in the finishing process is sufficiently applied to the material to ensure a reliable Pressure molding is performed.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view showing one embodiment of this invention, Fig. 2 is a partially enlarged view thereof, Fig. 3 is a partially cutaway view seen from the arrow line in Fig. 2, and Figs. 4 a to c.
FIG. 2 is an explanatory diagram showing the process of pressure forming a blank. 1... Upper board, 2... Lower board, 3... Hydraulic cylinder for preliminary pressurization, 4... Stopper, 5... Crank mechanism, 6... Hydraulic cylinder for main pressurization, 8... Hydraulic cylinder for stopper, 9 ...Latching plate.

Claims (1)

[Scope of utility model registration request] A pre-pressurizing cylinder is connected to the first mold mounting board and drives the mold mounting board forward and backward toward the second mold mounting board facing it. A stopper that temporarily restricts the retreat of the cylinder from a predetermined advance position after pressurization, a crank mechanism for multiplying the pressurizing force connected to the second mold mounting board, and a crank mechanism that connects the second mold mounting board to the second mold mounting board through this crank mechanism. A press device consisting of a main pressurizing cylinder that moves forward and backward toward the mold mounting plate 1.