JPS6219388Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a drive device for a warm/hot forging press.

Conventionally, a crank motion mechanism or a knuckle motion mechanism has been used as a drive device for warm/hot forging presses.

However, with the latter structure, the speed near the bottom dead center (the area where the mold comes into contact with the heated material) is slow, resulting in severe deterioration of the mold life, and to prevent this, lubricant (coolant) is used. It has to be used frequently, but doing so causes problems such as a drop in the temperature of the material and molded product.

In addition, with the former structure, although the speed near the bottom dead center is fast, there is not enough time near the top dead center, and in hot forging, etc., the mold must be stopped once at the top dead center to cool down. However, if the clutch/brake wears out rapidly, continuous operation is desirable.

This invention was developed in view of the above circumstances, and its purpose is to increase the speed near the bottom dead center,
It is an object of the present invention to provide a driving device for a warm/hot forging press that can provide a sufficient time in the vicinity of the top dead center.

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a first driven shaft having a gear 1a that is rotationally driven by a main pinion 2, and O ₁ is its rotation center. 3 is a second driven shaft provided eccentrically with respect to the rotation center O ₁ of the first driven shaft 1 having the gear 1a, and the tip of the lever 4 with a radius γ ₂ provided on the second driven shaft 3 and , and a position at a radius _γ1 from the axis _O1 of the first driven shaft 1 having the gear 1a are connected by a link 5. 6 is a third driven shaft provided at a position further eccentric from the rotation center O ₂ of the second driven shaft 3, and the tip of a lever 7 with a radius γ ₃ provided on the third driven shaft 6 and the second driven shaft A lever 8 provided at a radius r ₂ from the axis O ₂ of the shaft 3 is connected by a link 9. An eccentric drum 10 is provided on this third driven shaft 6, and the base of a connecting rod 11 is fitted into this. A slide (not shown) is connected to the tip of the cooking rod 11. The above configuration is shown in FIG. 3 in a simplified manner.

In the above configuration, the first driven shaft 1 having a gear
When the main pinion 2 rotates at a constant speed, the second driven shaft 3 rotates at an inconstant speed. Further, the constant speed rotation of the third driven shaft 6 rotated by the second driven shaft 3 is amplified, and the third driven shaft 6 rotates at a greater non-uniform speed than the second driven shaft 3.

Therefore, the relationship between the third driven shaft 6 and the connecting rod 11 can be changed by making the low speed rotation angle range of the third driven shaft 6 the lower moving range of the connecting rod 11 and the high speed rotation angle range making the upper moving range of the connecting rod 11. The descending region of the slide is longer and the ascending region of the slide is shorter, allowing the slide to return rapidly, thereby reducing the impact force in the machining process and shortening the time required for one cycle of the slide.

Note that FIG. 4 is a stroke diagram, in which the solid line shows the case of the press according to the above embodiment of the present invention, and the dotted line shows the case of the conventional press. From this, in the case of the present invention, the speed at the bottom dead center is high, the contact time with the material is short, and the time near the top dead center is sufficient, and the cooling time is long, even when continuous operation is performed. The mold can be cooled sufficiently. This can improve the life of the mold.

The present invention is as described above, and when the first driven shaft 1 having gears rotates at a constant speed relative to the main pinion 2,
The second driven shaft 3 rotates at a non-uniform speed, and the third driven shaft 6 rotated by the second driven shaft 3 has a greater non-uniform rotation than the second driven shaft 3 because the above-mentioned non-uniform rotation is amplified. At the same time, the relationship between the third driven shaft 6 and the conrod 11 is such that the low speed rotation angle range of the third driven shaft 6 is the lower motion range of the conrod 11, and the high speed rotation angle range is the upper motion range of the conrod 11. Therefore, the descending region of the slide is long, and the ascending and descending region of the slide is short, so it can be returned quickly, the speed at bottom dead center is fast, and the contact time with the material is shortened.
The time near the top dead center becomes sufficient, the cooling time becomes longer, and the mold can be sufficiently cooled even during continuous operation. This can improve the life of the mold.

In addition, since the gear 1a of the first driven shaft 1 is meshed with the main pinion 2 so that the main pinion 2 rotates the first driven shaft 1, the main pinion 2
The main pinion 2 and the gear 1a will not be damaged because they always mesh with the gear 1a at the same speed and no unreasonable force is applied to the meshing part, and moreover, only the gear 1a needs to be provided, and there is only one meshing point. Noise generation due to gear meshing is reduced.

[Brief explanation of the drawing]

1 and 2 show essential parts of the present invention, with FIG. 1 being a front view and FIG. 2 being a sectional view. FIG. 3 is a schematic configuration explanatory diagram, and FIG. 4 is a stroke diagram. 1, 3, 6 are driven shafts, 2 is main pinion, 1
0 is eccentric dome, 11 is connecting rod.

Claims (1)

[Scope of utility model registration request] A second driven shaft 3 is provided at a position eccentric to the rotation center O ₁ of the first driven shaft 1 having a gear 1a meshing with the main pinion 2, and a tip of a lever 4 provided on the second driven shaft 3, Axial center of the first driven shaft 1
Connect the position eccentric from O ₁ with link 5,
A third driven shaft 6 is provided at a position further eccentric from the rotation center O ₂ of the second driven shaft 3, and the third driven shaft 6
The tip _of the lever 7 provided at
An eccentric drum 10 is provided on the
At the same time, a slide is connected to the tip of the connecting rod 11, and the relationship between the third driven shaft 6 and the connecting rod 11 is changed so that the low speed rotation angle range of the third driven shaft 6 is aligned with the lower movement range of the connecting rod 11. A drive device for a warm/hot forging press, characterized in that the high-speed rotation angle range is the upper movement range of the connecting rod 11.