JPS5932417Y2 - Knockout upper limit position adjustment device in press machine - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a knockout upper limit position adjustment device in a press machine.

In conventional cold forging press processing, the length of the knockout pin (in-mold pin) used in each mold must be changed each time the stroke of the knockout is changed.

This is because the stroke of the re-nockout is constant and the upper limit position is always constant.

Therefore, we have prepared several types of knockout pins with different lengths, but if you want one with an intermediate length, or if you want to change the length slightly due to processing needs, you can use the knockout pin at the upper limit position. Although an adjustment device was required, the conventional adjustment device used was a simple method in which the upper limit position of the knockout pin was adjusted by, for example, manually decentering the pin on the shaft of the link via another link.

Problems to be Solved by the Invention However, with the eccentric pin adjustment method, the adjustment amount can only be adjusted by half a rotation of the eccentric pin, so the amount that can be adjusted is also slightly limited. Since the amount does not maintain a constant ratio, it takes a lot of effort to adjust, and the control is complicated, making it impossible to automate the adjustment.

The present invention eliminates this problem and automates the adjustment by making it possible to arbitrarily adjust the upper limit position of the knockout pin without changing the knockout pin in the mold each time, and to easily digitally control the amount of adjustment of the pin. It is an object of the present invention to provide a knockout upper limit position adjustment device in a press machine that makes it possible to adjust the knockout upper limit position in a press machine.

Means for Solving the Problems As a means for solving the above-mentioned problems, the present invention provides a method for solving the above-mentioned problems, as shown in the explanatory diagram of the embodiment of the present invention in FIG. The mutual relationship position such as the arm direction is specified, the fulcrum of the final swing lever 21 is made vertically adjustable, the knockout pin 25 is engaged with the knockout row 226 of the lever arm 22, and the upper limit position of the knockout pin is adjusted. It is structured.

The structure of the above-mentioned solution means will be explained in detail below with reference to FIG. 2, which is a diagram of an embodiment of the present invention.

A cam 5 is attached to a horizontal rotating shaft 4 supported by a frame 3 so as to rotate from a crank shaft 1 of a press via a bevel gear 2.

A roller 6 which is engaged with the cam 5 and transferred is pivotally connected by a pin 10 to one arm '9 of a bell crank 8 which is pivotally connected to a fulcrum shaft 7 built on the frame.

The tip of the other anim 11 of the bell crank 8 is pivotally connected to the tip of the piston rod 29 of the cylinder 28, and is pivotally connected to one end of the rod 12 with a pin 13 at a position in front of the piston rod 29.

The other end of the rod 12 is connected to a fulcrum shaft 20 which is supported by a fulcrum shaft bearing 19 having a threaded portion 19a which is screwed into the bed 14 by a motor 15 and a worm wheel 17 of a worm deceleration mechanism 16, and which moves up and down as the worm 18 rotates. A connecting pin 24 is attached to the tip of the arm 21 parallel to the inner arm 11 of the lever 23 which has two fitted arms 21 and 22.
It is pivoted with.

At the tip of the arm 22 which is inclined by 900 degrees with respect to the other lever 9 of the lever 23, there is a roller 2 that engages the lower end of the knockout pin 25 from directly below and moves the knockout pin 25 up and down.
6 is pivotally connected by a pin 27.

action Next, the operation of the present invention will be explained.

1 and 2 show the state at the midpoint of the knockout upper limit position adjustment.

From this state, the rotation of the crank 1 causes the cam 5 to move in the direction of the arrow through the bevel gear 2 and the rotating shaft 4, and the roller 6
When the bell crank 8 turns in the counterclockwise direction via When the knockout roller 26 starts to rise, the knockout pin 25 rises and the high part of the cam 5 and the roller 6 engage, while the knockout pin 25 remains at the main limit position and the low part of the cam 5 and the roller 6 engage. When the tail is turned, the knockout pin 25 remains at the lower limit position.

In the drawing, the roller 6 is engaged at the intermediate height, and the knockout roller 26 is engaged with the arm 221 at the intermediate position.
I'i, in horizontal state, center A of fulcrum shaft 19 and pin 2
It is at the same height as the center entrance of 7.

Therefore, the upper limit position adjustment of the knockout pin of the device of the present invention is performed by rotating the worm 18 and raising and lowering the fulcrum shaft 20 via the worm wheel 17 and the fulcrum shaft bearing 19.The final lever 23 is connected to the connecting rod 12 and the bell crank. 8, the arm 22 will be in the state [down to the left] when the axis of the shaft 20 rises from the horizontal state in Figure 1, and will be in the state [up to the left] when the axis is lowered. becomes.

At this time, the knockout roller 26 also moves up and down together with the arm 22, but since the roller 26 is engaged with the lower end of the knockout pin 25, the upper limit position of the knockout pin is adjusted.

At this time, the relationship between the vertical movement amount of the fulcrum shaft 20 and the knockout roller 26 is approximately a linear ratio, and will be explained below based on specific numerical values.

As mentioned above, the adjustment of the fulcrum shaft 20 causes the arm 22 to tilt slightly, but the misalignment (in the left-right direction) of the center of engagement between the roller 26 and the pin 27 is minimal and does not interfere with power transmission. do not have.

Embodiment FIG. 3 is a diagram in which the actual dimensions of one embodiment are included in the displacement relational diagram of device parts created from the relational symbols of the explanatory diagram shown in FIG. 1.

- For example, if the center A of the fulcrum shaft 21 is raised by 5rIrln and moved to the point A, the pin 2 of the knockout roller 26
Let us consider the case of moving upward by hmm to the center edge point of 7.

(Conversely, if the center A is lowered by S++a++, the opposite will occur.

) The relationship between the amount of movement of the fulcrum shaft and the amount of movement of the roller pin is: It falls.

By empirically substituting the adjustment (vertical movement) amount S of the fulcrum shaft into the above calculation formula as 20 above and 20 below (total 40 m), and calculating the vertical movement amount of the knockout pin (color), the calculated value of h is obtained. Ignoring the small values that can be ignored in actual work,
A relationship of 0.6125 is obtained, and approximately replacing it with B=K (constant) gives .

A graph of this relationship is shown in FIG. 4, and it is almost a straight line.

Effects of the Invention Since the present invention has the above-described structure and operation, when the knockout upper limit position adjustment scale is determined, the elevation adjustment amount S of the fulcrum shaft can be calculated backwards using the above proportional formula, so the proportional proportion value for the upper limit position adjustment amount can be calculated in advance. If the calculation is made and the fulcrum shaft is raised and lowered by that amount by rotating the worm, the upper limit position can be easily adjusted digitally and steplessly.

Due to the high-mix, low-volume production, there is no need to frequently replace the knockout pin even if the amount of adjustment of the knockout upper limit position is varied.

In addition, if a pulse disk is attached to the worm shaft and a proximity switch is used to count the pulses, a minimum of 0.0
Since adjustment control of 1 rran is also possible, it is also possible to automate highly accurate knockout upper limit position adjustment.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a knockout upper limit position adjusting device according to an embodiment of the present invention, Fig. 2 is a view taken along the AA arrow in Fig. 1, and Fig. 3 is a displacement relationship of the upper limit position adjustment of an embodiment of the present invention. figure,
Fig. 4 is a graph (approximate value) of the relationship between the fulcrum shaft vertical movement adjustment amount and the knockout pin vertical movement amount, and Fig. 5 is an enlarged view of the main parts of the fulcrum axis adjustment device and knockout pin vertical movement device of one embodiment. be. 1 is a crankshaft, 4 is a rotating shaft, 5 is a cam, 6 is a roller,
7 is a fulcrum shaft, 8 is a bell crank, 9 is an arm, 11 is an arm, 12 is a connecting rod, 13//'i pin 114 is a bed, 15 is a motor, 17 is a worm wheel, 18 is a worm, 19 is a fulcrum shaft 20 is a fulcrum shaft, 21 is an arm, 22 is an arm, 23 is a final swing lever, 25 is a knockout pin, 26 is a knockout roller, and 27 is a pin.

Claims (1)

[Scope of utility model registration request] A cam is provided on the same rotation axis as the crankshaft of the press, and a roller that engages with the cam is pivotally connected to one arm of the bell crank, and the swinging movement of one arm via the cam and roller is transferred to the other arm of the bell crank. The swinging motion of one arm of the final lever is transmitted from the arm of the arm through the connecting rod to one arm of the final swinging lever, and the swinging motion of one arm of the final lever is transmitted to the knockout pin in the press bed via a knockout roller pivotally connected to the other arm. transmitting vertical motion, the other arm of the bellcrank and the one arm of the final lever being disposed in a parallel direction, and the one arm of the bellcrank and the other arm of the final lever being disposed in a perpendicular direction; , characterized by a configuration including an adjustment device that adjusts the fulcrum shaft of the final lever in the vertical direction and vertically moves and adjusts the knockout pin vertically engaged with the knockout roller via the knockout roller pivotally connected to the other arm. Upper limit position adjustment device for knockout pins in press machines.