JPH0366049B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a die clamper that is installed on a slide or bolster of a press and used for fixing a mold.

``Prior art'' Conventionally, an upper die clamper that was installed on the slide of a press and used to fix the upper die to the lower surface of the slide was disclosed, for example, in Japanese Utility Model Publication No. 46-36956. A type in which a downward cylinder is fixed on the upper surface of the overhanging part, and the vertical movement of the piston of the cylinder causes the clamp rod, which is swingably connected to the lower end of the piston, to swing and clamp the upper die. ing.

``Problem to be Solved by the Invention'' However, in the conventional upper die clamper, the center of swing of the clamp rod is at the lower end of the piston, and the center of swing moves as the piston moves up and down, so the structure naturally gives swings to the clamp rod. Moreover, since the height of the cylinder provided on the top of the slide of the press is high, it has to be installed at a location that does not interfere with the mechanical knockout device provided on the slide.

"Means and operations for solving the problems" The present invention eliminates these drawbacks, eliminates the movement of the pivoting center of the clamp rod, ensures the pivoting action, and lowers the height of the top of the slide of the press. In order to facilitate installation, a main body is installed on the upper surface of the press slide that has a fulcrum pin for the clamp rod and a small air cylinder device that swings the clamp rod. The clamp head for clamping is provided as a cylinder type, and hydraulic pressure is supplied from the fulcrum pin portion through a passage within the clamp rod. As a result, the external shape of the main body with the fulcrum pin etc. has been made smaller, and there is no interference with the mechanical knockout provided on the slide of the press, so there are no restrictions on the mounting position, and the position of the fulcrum pin is fixed. This ensures that the clamp rod swings reliably, and the clamp is strong because it is powered by hydraulic pressure.

Embodiment FIGS. 1 and 2 show the structure of an upper die clamper 1 according to the present invention. A main body 3 of an upper die clamper 1 is attached to the upper surface of a slide 2 of the press. The main body 3 is provided with a horizontal fulcrum pin 4 parallel to the side surface of the slide 2, and the upper end of a clamp rod 5 is rotatably provided at the center of the fulcrum pin 4. The fulcrum pin 4 may be fixed to the clamp rod 5, and the fulcrum pin 4 may be rotatably supported by the main body 3. On the upper surface of the base of the clamp rod 5, half of the side surface of the slide 2 forms an inclined surface 6 that descends toward the side surface, and the remaining half forms a horizontal surface 7. The main body 3 is provided with a downward cylinder portion facing a position displaced from the center of the fulcrum pin 4 on the horizontal surface 7 of the clamp rod 5 to the side opposite to the side surface of the slide 2, and a piston 8 is fitted therein so as to be able to move up and down. A compressed air supply port 9 communicating with the upper cylinder chamber of the piston 8 is provided in the main body 3. Above the inclined surface 6 of the clamp rod 5, a downwardly directed hole 10 is provided in the main body 3 from just above the center of the fulcrum pin 4 toward the side surface of the slide 2, and between the inclined surface 6 and the bottom of the hole 10. A spring 11 is tensioned. Therefore, the clamp rod 5 is biased by the spring 11 and becomes vertical with its shaft along the bottom of the grooves 13 and 14 provided in the slide 2 and the upper die plate 12, and compressed air is supplied from the air supply port 9. When this occurs, the piston 8 pushes down the horizontal surface 7 and compresses the spring 10, causing the clamp rod 5 to swing to the position shown by the dashed line.

A piston part 15 is fixedly attached to the lower end of the shaft part of the clamp rod 5, and a clamp head 17 is provided which has a cylinder chamber 16 in which the piston part 15 is adapted to be movable in the axial direction. An opening below the cylinder chamber 16 of the clamp head 17 is closed with a lid 18. The cylinder chamber 16 of the clamp head 17 is connected to an oil passage 1 provided inside the clamp rod 5.
9 communicates with the outer peripheral portion of the fulcrum pin 4, and further communicates with a pressure oil supply port 21 provided in the main body 3 through an oil passage 20 provided in the fulcrum pin 4. The oil passage 20 on the outer periphery of the fulcrum pin 4 is kept oil-tight by packings 22, 22 provided on the inner periphery of the clamp rod 5 and packings 23, 23 provided on the inner periphery of the main body 3.
A spring 24 is stretched between the piston portion 15 of the clamp rod 5 and the lid 18 of the clamp head 17, and has the function of urging the clamp head 17 downward to unclamp it when the cylinder chamber 16 is drained of oil. doing. The cylinder chamber below the piston portion 15 is open to the atmosphere through a ventilation hole 25 provided in the lid 18.

Next, we will discuss the effect. FIG. 2 shows the clamped state of the upper die clamper 1, in which pressure oil is supplied from the oil supply port 21, the air supply port 9 is exhausted, and the die plate 12 of the upper die is raised upward by the pressure oil from the clamp head 17. It is strongly clamped by the biasing force of.

When unclamping the die plate 12, pressure oil is first drained from the oil supply port 21. The clamp head 17 is lowered by the spring 24, and a certain distance is created between it and the die plate 12. Next, when compressed air is supplied to the air supply port 9 and the horizontal surface 7 of the base of the clamp rod 5 is urged by the piston 8, the clamp rod 5 swings to the dashed line while compressing the spring 11 and retreats to a position where it does not interfere with the die plate 12. do. The die plate 12 is then removed downwards.

When clamping the die plate 12, the die plate 12 is first carried into a fixed position on the lower surface of the slide 2. The air supply port 9 is evacuated in the reverse order to that described above, and then pressure oil is supplied to the oil supply port 21. The clamp head 17 slides the die plate 12 using pressure oil 2.
Clamp firmly.

Although the above explanation relates to the upper die clamper, the same applies to the case where the lower die is fixed to the bolster.

[Effects of the Invention] According to the present invention, since the position of the fulcrum pin is fixed, the swinging of the clamp rod is reliable. Since the swinging piston is small and has a small stroke, the main body attached to the top of the slide is small and there is no risk of interference with the mechanical knockout provided on the slide. Therefore, the mounting position of the upper die clamper is not restricted. A separate cylinder device for clamping is provided, so the clamping operation is reliable, and since hydraulic pressure is used, the clamping is strong. The practical effects and benefits are great.

[Brief explanation of drawings]

FIG. 1 is a partially cross-sectional front view of the embodiment, and FIG. 2 is a side view of the negative cross section of FIG. 1 is an upper die clamper, 2 is a slide, 3 is a main body, 4 is a fulcrum pin, 5 is a clamp rod, 6 is an inclined surface, 7 is a horizontal surface, 8 is a piston, 9 is an air supply port,
10 is a hole, 11 is a spring, 12 is a die plate, 1
3 is a groove, 14 is a groove, 15 is a piston portion, 16 is a cylinder chamber, 17 is a clamp head, 18 is a lid, 1
9 is an oil passage, 20 is an oil passage, 21 is an oil filler port, 22 is a gasket, 23 is a gasket, 24 is a spring, 2
5 is a ventilation hole.

Claims (1)

[Scope of Claims] 1. A die clamper that clamps a mold to a slide of a press, comprising: a main body of the die clamper fixed to the outer periphery of the upper surface of the slide with a side surface parallel to the side surface of the slide; a fulcrum pin supported horizontally and parallel to the side surface; a vertical position with the upper end supported by the fulcrum pin and hanging down along the mold; a clamp rod which is swingable between an inclined position and is biased to rotate toward the vertical position; Displaced to the side opposite to the side of the slide and provided downward on the main body,
a cylinder device that is supplied with pressure air to urge the upper end surface of the clamp rod and rotate the clamp rod to an inclined position; and a cylinder device that accommodates a piston portion at the lower end of the clamp rod and is slidable between the clamp rod and the piston portion. A spring is provided, and is moved upward by hydraulic pressure supplied from the main body via the fulcrum pin and the clamp rod to the cylinder chamber on the upper side of the piston, clamps the mold to the slide, and removes the hydraulic pressure. A die clamper comprising: a clamp head that moves downward to unclamp the mold;