JPS6310099A - Slide driving device for press - Google Patents

Abstract

PURPOSE:To improve the quality of a formed product by providing the crank shaft not co-axial to the upper part from the rotary center of a main gear and arranging the link to interlock the lever projected by a crank and main gear as well, etc. CONSTITUTION:The crank shaft 9 not co-axial to the upper part aslant is provided for the rotary center O1 of a pair of main gears 7 driven via a pinion 6 and a crank 11 is subjected to a spline engagement at the end part thereof. One end of a link 14 is supported with a pin 15 to the lever 11b projecting from the crank 11 and the other end to the outer peripheral part of the main gear 7. When the main gear 7 rotates at equal speed around the center O1, the crank 11 rotates with O2 point as the center via the link 14 and owing to the rotary center O2 being not co-axial to the upper part aslant the forming at a slow drawing speed is enabled and the quality of the formed product is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION INDUSTRIAL APPLICATION This invention relates to a slide drive device for a press that drives a slide with a non-focal curve.

2. Description of the Related Art Conventionally, most of the presses in which the slide is driven by a crank mechanism drive the slide with a stroke curve A similar to the seaweed curve as shown in FIG. and Japanese Unexamined Patent Application Publication No. 14909/1983. In the figure, B indicates a velocity curve and C indicates an acceleration curve).

The conventional slide drive device described above is suitable for use in punching presses and the like that operate near the bottom dead center of the slide because the slide descending speed reaches its maximum near the center of the slide stroke.

Problems to be Solved by the Invention However, in the case of a drawing press that performs deep drawing, etc., there are 9 drawing speeds suitable for the thickness and material of the material to be formed. In the case where the descending speed is maximum near the bottom dead center, there are problems such as having a negative effect on the material and making it impossible to obtain a molded product of good quality.

This invention is not intended to improve the above-mentioned problems.

It is something that was given.

Means and Effects for Solving Problems A main gear rotated around a rotation center 01 by a main motor, and a crankshaft supported by a crankshaft provided at a position eccentrically ε above the rotation center 01 of the main gear. A crank that rotates around the center O2, a link that interlocks a lever protruding from the crank and the main gear, and a connecting rod that connects the eccentric shaft and the slide make the slide non-contactable. □
□Press slide drive device that drives along a curve.

Example An embodiment of the present invention will be described in detail with reference to the drawings.

In the figure, 1 is a press main body, which consists of a bolster 2, applied 3 installed at the four corners of the bolster 2, and a crown 4 supported on the top of these applied 3, and a slide that drives a slide 5 inside the crown 4. A drive device A is housed therein.

As shown in FIGS. 2 and 3, the slide drive device A includes a main motor (not shown) and a main pinion 6.
It has a pair of main gears 7 driven through the
These main gears 7f'i are supported by the eccentric drum 8,
It is designed to rotate around a rotation center O1.

The eccentric drum 8 has a crankshaft 9 divided into two parts from the center, and a center 02 eccentric from the rotation center 01 of the main gear 7 is supported by the frame 4α, and ends of each crankshaft 9 that are opposite to each other are supported by a frame 4α. A crank 11 is engaged with the crank 11 by a spline.

The eccentric shaft +10LTI of the crank 11 has one end supported by a connecting rod 13 whose other end is pivoted to the slide s side by a pin 12.

Further, a lever Ilb is protruded from the crank II, and one end of the link 14 is connected to the pin 1 at the tip of the lever 11b.
5, and the other end of the link 14 is pivotally connected to the outer peripheral side of the main gear 7 by a pin 16 so as to transmit 70 rotations of the main gear to the crank 11.

The above configuration is simplified and illustrated in FIG. 4.

Next, the operation will be explained. The rotation of the main motor (not shown) is transmitted from the main pinion 6 to the main gear 7, and the main gear 7 is rotated at a constant speed in the direction of arrow A (see FIG. 4) about the rotation center O1.

The main gear rotates 70 times via the link 14 to the crank 11.
is transmitted to the lever IIA, and the crank 11 moves to the center of rotation O1.
It is rotated in the direction of the arrow around the center.

The slide 5ri is eccentrically ε diagonally upward with respect to the rotation center O of the crank 11 and the rotation center 01 of the arming gear 7, and is thereby connected to the eccentric shaft 11a of the crank 11 via the connecting rod 13.The slide 5ri is curved A' in FIG. As shown in , the crankshaft is stroked along a non-□□□ curve in which the low-speed rotation angle range is the lower movement range of the connecting rod 130, and the high-speed rotation angle range is the upper movement range of the connecting rod 13.

As a result, the lower motion range of the slide 5 becomes longer and the upper motion range of the slide 5 becomes shorter. Therefore, by raising the slide 5 at a slow speed during molding and rapidly after molding, the impact during the molding process is reduced. It becomes possible to reduce the force and the time required for one slide cycle.

Incidentally, curve tsB' in Figure 5 shows a velocity diagram, and curve C' shows an acceleration diagram.

Effects of the Invention As described in detail above, the slide descending speed can be slowed down in the working area near the bottom dead center of the slide, making it easy to obtain a drawing speed suitable for the material, thereby improving quality. High quality molded products can be obtained.

Furthermore, since the slide rises rapidly after molding, the time required for one slide cycle is shortened, thereby improving productivity.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is an overall view of the press, Fig. 2 is a front view of the device, and Fig. 3 is a cross-sectional view of the same.
4 and 5 are action explanatory diagrams, and FIG. 6 is a conventional explanatory diagram. 5 is the slide, 7 is the main gear, 9 is the crankshaft, 11
is the crank, 11G is the eccentric shaft, 11h is the lever, 13 is the connecting rod, and 14 is the link.

Claims (1)

[Claims] It is supported by a main gear rotated by a main motor around a rotation center O_1 and a crankshaft provided at a position eccentrically ε diagonally upward from the rotation center O_1 of the main gear, and rotated around a center O_2 of the crankshaft. a crank 11, and a lever 1 protruding from the crank 11.
1b and the main gear 7, a second link that interlocks the eccentric shaft 11a of the crank 11 and the first link, and a connecting rod that connects the eccentric shaft 11a and the slide. The slide drive device of the press.