JPS6025313Y2 - pilot equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pilot device for positioning, for example, a progressive type cutting die.

In the case of a material as shown in Fig. 1 that is pressed in multiple steps and a progressive cutting die as shown in Fig. 2,
The positional accuracy of the material in each process is very important for the product, and for this reason various high-precision material feeding technologies have been developed, but one of them is a relatively simple, inexpensive, and high-performance technology. Positioning devices using precision pilot pins are widely used.

As shown in Figures 3 and 4, this pilot pin device is equipped in advance with a reference hole punched in the previous process for each process of feeding a fixed length. This is a device that uses the taper at the tip to move the material minutely following the pin, and finally holds the material using the diameter of the pin for precise positioning.

However, as shown in Figure 4, in this device, the pilot hole punched in the previous process must be in a relationship with the pilot pin hole that will ensure that the pilot pin will separate from the pilot pin after the material is punched. Pin diameter a
and the pilot hole diameter require a certain clearance.

However, there are many press-formed products that cause problems such as misalignment of the material due to this gap and even errors during machining.

As a solution to this problem, as shown in Figure 5, the gap was made extremely small, and the disadvantage of the material getting stuck in the pilot pin was eliminated by providing a stripper with a spring or the like to push it out. A pilot device has been implemented.

This device can certainly solve the problem caused by the gap, but since the surface of the stripper that presses the material must always protrude beyond the predetermined diameter position of the pilot pin, the pilot pin is fixed as shown in Figure 6. While the material is slightly moved by the taper part, the stopper presses the material and the material does not shift to the correct position along the pilot pin, resulting in press processing being continued or the pilot hole being damaged. There are many problems that occur.

Furthermore, as shown in FIG. 7, a device is also implemented in which puncher pins are provided at several locations around the pilot pin in order to allow the punched material to fall from the pilot pin.

According to this device, the above-mentioned problems are alleviated, but there are problems in that the hard pins cause scratches and dents on the material, and especially bends in the thin plate.

The present invention was developed in order to eliminate the drawbacks of the prior art described above, and the purpose is to provide a pilot device that can position materials with high precision and does not cause scratches or bends in the materials. do.

The present invention will be described below with reference to an embodiment shown in FIGS. 8 to 11.

The die 6 is fixed to the lower die holder 8, and the lower die stripper 7 is fitted to the die 6 and tightens the fifth spring 20a and the nut 2.
It is attached to the lower die holder 8 in a floating state by a stripper holder 22a screwed into the stripper holder 1a.

Further, the punches 9 and 23 are fixed to the upper mold holder 11,
The upper die stripper 10 is fitted in the middle thereof and is attached in a floating state to the upper die holder 11 by a stripper bolt 22b screwed into a first spring 20b and a nut 21b.

There is a lever 12 passing through the upper grooves of the punches 9 and 23, and the left end thereof is a hinge 13 fixed to the upper die holder 11.
It is slidably supported by a fulcrum 14 attached to the holder, and a pin 17 is provided at the right end of the fulcrum, and the pin 17 can be used as a fulcrum for sliding. The tip 16a supports a dove-shaped pawl 16 that engages with the die 9.

The pilot pin 2 is pushed down by the second spring 15a, and its shoulder touches the upper surface of the lever 12, and the lever 1
2, it is in a state where it can be slid up and down along the hole of the punch 23.

The tip of the pilot pin 2 has a tapered shape, and the position of the regular positioning diameter is located slightly below the lower surface of the stripper 10.

The right end of the lever 12 is pressed against the upper die by a fourth spring 15c, and the force is set to be greater than the force pushing down the pilot pin 2.

A kicker 18 for operating the lever 12 at the upper mold lowering limit and a stopper 19 for operating the lever 12 at the upper mold upper limit are fixed to the lower mold holder 8, respectively.

Next, the operation of the pilot device of the present invention constructed as described above will be explained.

The material 1 from which B-F lot holes were punched in the previous process is sent to the next process with rough positional accuracy, where it is positioned and pressed, but when the upper mold starts to descend in the state shown in Figure 8, The tip of the pilot pin 2 fits into the pilot hole of the material, and as the pilot pin 2 descends, the material is slightly moved by its tapered portion, and finally the pilot pin 2 is positioned at its regular diameter.

Next, the positioned material is sandwiched between the punch 23 and the stripper 7 and becomes the state shown in FIG. 9, and the first spring 20
The pressing force of the stripper 7 due to b is the upper die hole';/”
-l increases as l falls, and finally the material 1 is punched out by the engagement of the punches 9 and 23 with the die 6, but the next moment after punching, the puncher 18 presses the rear part 16 of the claw 16.
b is struck to rotate the pawl 16, the tip 16a of the pawl 16 comes off the punch 9, and the lever 12 becomes free.

Then, the lever 12 swings upward about the fulcrum 14 due to the downward force of the fourth spring 15c, and at the same time, the pilot pin 2 in contact with the lever 12 rises and comes out of the punching board, resulting in the state shown in FIG. Become.

In FIG. 10, the movement of the pilot pin 2 and the lever 12 is shown by an imaginary double-dashed line.

Next, when the upper die passes the bottom dead center and begins to rise, the holding force of the lower die stripper 7 weakens, and it finally separates from the material 1 and the blank.

When the upper die rises and reaches near the top dead center, the lower die holder 8
The right end of the upper surface of the lever 12 is held down by the flange 19a of the stopper 19 attached to the lever 12, and rotates clockwise about the fulcrum 14 as the upper die rises, and the tip 16 of the claw 16
a is pressed and engaged by the punch 9, and the state shown in FIG. 11 is reached at the upper die lifting limit.

In the next step, the same operation is performed again from the initial state as shown in FIG.

As explained above, the present invention has the following effects.

The holding surface of the upper mold stripper is above the regular diameter position of the pilot pin, so the upper mold stripper does not hold down the material while the pilot pin is positioning, so minute movement of the material is smooth and reliable. positioning, and there is no need to damage the pilot hole as mentioned above.

Furthermore, since the material is firmly held by the lower die stripper and the die until the material is cut and the pilot pin can be pulled out, it is possible to prevent the material from being caught by the pilot pin.

This means that the gap between the pilot hole diameter and the pilot pin diameter can be made extremely small, and highly accurate press working can be provided.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the material, Fig. 2 is a sectional view of the cutting die, Figs. 3 and 4 are sectional views of the pilot pin part, Figs. 5 to 7 are sectional views of the conventional pilot pin part, and Figs. FIG. 8 is a cross-sectional view showing one embodiment of the pilot device of the present invention, and FIGS. 9 to 11 are cross-sectional views explaining the operation of the present invention. 2...Pilot pin, 4...Stripper, 6...Gui, 7...Lower die stripper, 8...Lower die holder 9 ,23...
... Punch, 10 ... Upper type stripper
11... Upper mold holder, 12... Lever, 13... Hinge, 14... Fulcrum,
15a...Second spring, 15b...
・Third spring, 15c...Fourth spring, 16...Claw, 16a...Tip, 16
b...Rear, 17...Pin, 18...
...Kitsuka 19...Stripper, 1
9a...Tsuba, 20a...Fifth spring, 20b...First spring.

Claims (1)

[Scope of utility model registration request] In a progressive press mold, a hinge fixed to one end of the lower part of the upper mold holder has a hole in the center, and one end of a lever that moves up and down by the hinge is attached, and the inner and outer diameters of the hole differ at the lower part of the lever. Two types of punches are arranged concentrically, and the upper die stripper is placed in a floating state relative to the upper die holder by means of a stripper bolt fitted between these punches and screwed together by the first spring. A pilot pin is placed in the center of the lever that is pushed down to the upper surface of the lever by a second spring installed in the center of the holder and passes through the hole in the lever and the innermost diameter of the punch. The presser surface of the upper mold stripper is located above, and the lever moves up and down using a pin as a fulcrum to the relative position of the outermost diameter of the punch, and the rear part is supported by a third spring implanted in the upper mold holder. The tip of this pawl holds the punch on the lever side by the bias of the third spring, and the lever is pushed upward from the pawl at the bottom of the lever toward the other end, and the pilot pin is pushed downward by the force. The lower die stripper is placed in a floating state relative to the lower die holder by means of a stripper bolt which is fitted with a goose fixed to the lower die holder and screwed with the fifth spring. A kicker that operates the pawl at the upper mold lowering limit is installed at a position relative to the rear of the pawl on the lower mold holder, and a kicker that operates the pawl at the upper mold upper limit is placed at a position relative to the opposite end of the lever on the lower mold holder. A pilot device that operates a lever and has a stopper that penetrates the lever and has a flange at the tip.