JPS5926402Y2 - Preset 2 operation control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a preset 2 operation control device for a press that uses one preset counter and two rotary cam limit switches to obtain two operation signals.

Conventionally, when performing high-speed drilling in a coil material with a fixed pitch constant sequence as shown in Fig. 7, an upper die and a lower die configured as shown in Fig. 9 are used, and an automatic feeding device as shown in Fig. 8 is used. First, drill a constant row of holes at a fixed pitch, and when drilling the last row, drill pilot holes at the same time.
Next, the press is stopped at a fixed position (generally the top dead center position), and after it is fed intermittently by a fixed pitch T, the press is driven again and holes are drilled in a constant row at a fixed pitch in the same way. Stop and repeat intermittent feeding in the same way.

In such constant pitch constant row hole machining, two signals are required: a signal to issue a pilot punch and a signal to stop the press after drilling a constant row of holes. However, due to performance problems such as an error in the operation timing between the two counters, accurate operation of the precera 12 cannot be obtained, causing defects.

Moreover, the price of one preset counter is quite expensive, and there is also a problem in terms of cost.

FIG. 1 is an electrical circuit diagram of a conventional control system using two preset counters.

MC1 and MC2 are equipped with a preset counter auto-reset (automatic return).

It has the usual configuration as shown in Figure 3, and is divided into an upper and a lower counter.The upper counter counts and indicates the number of drive strokes of the press, and the lower counter is a preset counter that can arbitrarily preset a constant. It becomes.

MCLS and MCLS2 are contacts that turn on when each of MC1 and MC2 reaches a preset value.

Xl is an auxiliary relay that is used to self-hold when the preset counter MC1 reaches a preset value and MCLSl issues an on signal.

SVl is a solenoid valve for projecting the pilot punch.

R51 is a press rotary cam limit switch that is usually installed on the crankshaft of the press so as to output a signal to the preset counter once for each stroke of the press. closed).

FIG. 3 is a perspective view of a conventional two-action control device using two Ginoset counters.

Conventionally, for example, when drilling 20 rows of holes, drilling a pilot hole at the 20th row, and repeating the same process again after intermittent feeding, the preset counter MC1 was first preset to turn on at the 19th row. From the 1st row to the 19th row, one row of holes is drilled at a fixed pitch for each stroke, and in the 19th row, the pilot punch is protruded, and in the 20th row, the holes in the 20th row and the pilot hole are combined. I was doing everything I could.

Further, the preset counter MC2 was preset to turn on at the 20th column, and the press was stopped at a fixed position.

Therefore, the pilot hole could not be drilled unless the pilot punch was protruded one step before stopping at the fixed position, and in the end, a two-acting pre-operation type was adopted in which there was a one count difference between the two preset counters MC15MC2. .

If the performances of these two preset counters do not match, or if there is a difference in excitation ability during use, it will cause a mistake.

In order to eliminate these drawbacks, the present invention uses one preset counter and the input signals of two rotor no cam limit switches to generate a signal to output a pilot punch that can appear and retract, and to stop the press at a fixed position. It is an object of the present invention to provide a preset 2 operation control device that accurately controls signals.

To explain the present invention with reference to the drawings of an embodiment, FIG. 6 is a perspective view of a two-acting control device using one preset counter and two rotary cam limit switches according to the present invention.

FIG. 4 is an electrical circuit diagram of an embodiment of the preset 2 actuation control device of the present invention, which is used for high-speed drilling of constant pitch constant rows in a coil material as shown in FIG. 7.

F2 is a fuse, X2 is an auxiliary relay, R33 is a rotary cam limit switch for issuing a press fixed position stop signal,
SS2 is a preset counter all-hole switch, SV2 is a solenoid valve for pilot punch appearance, MC3 is a preset counter with auto-reset, Xc is a clutch relay contact for the press, MCLS3 is a MC3 preset force counter contact, R52 is for preset counter human power signal transmission The rotary cam limit switch Xc is a press clutch relay contact and turns off when the press stops, turning off auxiliary relay X2 and retracting the pilot punch.

Now, for example, when drilling a hole with a constant pitch constant sequence as shown in Figure 7,
Drill a pilot hole in the 0th row and 20th row, and in order to repeat the same process again after intermittent feeding, connect the power to the R and T phases, set the on/off switch SS2 to the OFF position, and pilot punch the preset counter MC3. In this example, at the 20th stroke, open the pilot hole (
Therefore, the pilot punch is released at the 19th stroke, and the rotary cam limit switches R32 and R33 are installed on the same crankshaft of the press.
As shown in Fig. 5, the switch is turned on at an operating angle of 210° to 255°, and the switch is turned on at an operating angle of 135° to 180° (this angle may vary slightly depending on the operating state of the brake when the press is stopped at a fixed position). set.

When the press finally starts operating, the hole punch (Fig. 9) fixed to the upper mold is used to make one
While drilling holes in rows, the drilling process continues depending on the number of strokes, such as 1 stroke, 2 strokes, etc.

The 19th stroke has been completed and the hole punch (
In other words, the press) returns to 21 of R32 in the middle of the rising process.
The same 19th stroke passes through 0° to 255° (
At this point, the brissent counter MC3 reaches the preset stroke number and turns on (closes) the contact MCLS3.
2 relays hold themselves.

At the same time, the solenoid valve Sv2 for pilot punch appearance and retraction is activated, and the pilot punch pops out.

Subsequently, when the hole punch (that is, the press) passes the top dead center and enters the downward movement on the 20th stroke, the rotary cam limit switch R33 of the press changes the angle between 135° and 180°.
The frontage-tally cam limit switch is turned on, creating an AND condition with the X2 relay, which is already self-holding, being turned on.

The pilot punch is in a protruding state due to the X2 relay being turned on, and on the 20th stroke, the constant hole in the 20th row and the pilot hole following the 20th row are simultaneously punched.

On the other hand, the AND condition of this X2 relay one contact and R33 sends the signal of the 20th stroke to the press fixed position stop circuit, and the press is stopped at the fixed position (generally the top dead center position).

When the press stops, the <XC turns off and the pilot punch retracts, as described above.

Note that R32 is not only used exclusively for the pilot punch, but may also be used for a work counter in normal continuous press work, for example.

The present invention has the above-mentioned structure and function, and since only one preset counter is used, there is no need to select and purchase two counters with matching performance, or to reduce excitation capacity due to deterioration of use. The occurrence of mismatch errors due to inferiority is eliminated, and since there is only one preset counter, there is no need to worry about presetting errors between the two counters, and accurate machining control can be expected.

Furthermore, the control panel can be made smaller and costs can be reduced, which is a significant effect of this invention.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram of a conventional control method using two preset counters, Fig. 2 is an explanatory diagram of the operating angle of the rotary cam limit switch R31 for transmitting the preset counter input signal in Fig. 1, and Fig. 3 is an electric circuit diagram of a conventional control method using two preset counters. A perspective view of a conventional two-acting control device using two preset counters.
FIG. 4 is an electric circuit diagram of one embodiment of the preset 2 actuation control device according to the present invention, FIG. 5 is an explanatory diagram of the operating angles of the two rotary cam limit switches R51 and R32 in FIG. 4, and FIG. Invented preset counter 1
2 shows a perspective view of a two-acting control device using two rotary cam limit switches. FIG. 7 is an explanatory diagram of high-speed drilling of a constant pitch constant sequence in a coil material, FIG. 8 is a diagram of an intermittent feeding mechanism using a separate drive, and FIG. 9 is a diagram of the construction of a pilot punch mold. Fo, F2 are fuses, SS1. SS2 is a preset counter on/off switch, MC15MC25MC3 is an auto reset counter, MCLSl. MCLS25MCLS3 is a preset value contact, Xl,
2 is an auxiliary relay, XC is a clutch relay contact, S■1.
SV2 is a solenoid valve for pilot punch operation, R31, R3
2 is a rotary cam limit switch for issuing a preset counter input signal, R33 is a rotary cam limit switch for issuing a press fixed position stop signal, T is a constant pitch dimension, and M is a coil material.

Claims (1)

[Scope of utility model registration request] One preset counter and two rotary cam limit switches R32 and R33 are used, and the preset counter is connected to the rotary cam limit switch R.
a relay circuit which is electrically connected to count according to the input signal of 32, and which generates and holds a first signal for ejecting a pilot punch which can be freely retracted by counting a preset value; Preset 2 operation control device for a press, characterized in that it is provided with a holding contact based on a signal and an electric circuit that generates a second signal for stopping the press in a fixed position based on an input signal of a rotary cam limit switch R53. .