JPH0911127A - Tip dresser and its controller - Google Patents

Abstract

PURPOSE: To provide a tip dresser applicable to a welding equipment, in which a lot of welders are arranged, and its controller. CONSTITUTION: A tip dresser comprises a dresser main body 2 for polishing electrode tips 1a, 1b and a controller unit 6 which controls pressurization/ nonpressurization and pressurization force of the dresser main body 2 by the electrode tips 1a, 1b of a welder and has a different body from the dresser main body 2, and this controller unit 6 is provided with an electropneumatic proportional valve 4 which sets air pressure supplied to a cylinder 7 for driving a controller 3 and the electrode tips 1a, 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tip dresser and a controller thereof, and more particularly to a tip dresser for dressing (polishing) an electrode tip of a spot welding machine such as a table top and a general welder, and a controller thereof.

[0002]

2. Description of the Related Art In a spot welding machine, if the shape of the electrode tip is deformed due to wear of the electrode tip due to repeated pressurization and energization, the welding quality cannot be ensured.
A tip dresser for polishing the electrode tip is used.

As a conventional chip dresser, for example, as disclosed in Japanese Patent Application Laid-Open No. 1-181985,
A moving body is supported to be lifted up and down on a frame fixed on a base, the dresser body is fixed to this moving body, and a cutter blade that is driven to rotate by an air motor is attached to this dresser body. A stationary tip dresser in which a cutter blade is rotated by an air motor while the electrode tip is pressed to polish the electrode tip is known.

[0004]

However, since the above-mentioned conventional tip dresser is a stationary tip dresser, one tip dresser must be installed corresponding to one welding machine. Therefore, the welding equipment becomes large in size and the cost is increased, and it is impossible to apply the welding equipment to a large number of welding machines such as a table top and a general welder.

The present invention has been made in view of the above points, and an object of the present invention is to provide a tip dresser and a controller thereof that can be applied to welding equipment in which a large number of welding machines are arranged.

[0006]

In order to solve the above-mentioned problems, the tip dresser according to claim 1 is a tip dresser for polishing electrode tips of a welding machine. In the tip dresser, the dresser body for polishing the electrode tips and the welding machine It is composed of a controller separate from the dresser main body, which controls pressurization / non-pressurization and pressurization of the dresser main body by an electrode tip,
This controller was equipped with an electropneumatic proportional valve that sets the air pressure supplied to the actuator that drives the electrode tip.

A controller of a tip dresser according to a second aspect is a tip dresser controller having a dresser body for polishing an electrode tip of a welding machine, the controller being separate from the dresser body and instructing a dress start. Starter switch means, chattering prevention means for shaping the output of the starter switch means to generate and output a dressing start signal, and pressurizing the dresser body by the electrode tip based on the dressing start signal from the chattering prevention means. Start signal generating means for generating a start signal to be generated, timing generating means for generating and outputting a timing signal according to a predetermined pressurizing pattern based on the start signal from the start signal generating means, and timing from the timing generating means Start output from the start signal generation means in response to a signal Holding means for holding a signal, a dressing pressure setting means for setting a pressing force of the dresser body by the electrode tip according to a timing signal from the timing generating means, and a starting signal from the starting signal generating means. A switching unit for switching between pressurizing and non-pressurizing the dresser body by the electrode tip and a pressurizing force switching unit for switching the pressurizing force set by the dressing pressure setting unit are provided.

[0008]

The tip dresser according to claim 1 is a controller separate from the dresser body for polishing the electrode tip and the dresser body for controlling the pressurization / non-pressurization and pressurization of the dresser body by the electrode tip of the welding machine. This controller is equipped with an electro-pneumatic proportional valve that sets the air pressure supplied to the actuator that drives the electrode tip, so use the electro-pneumatic proportional valve as the air supply path to the actuator that drives the electrode tip of the welding machine. It can be connected and the electrode tip can be polished by the dresser body while controlling the pressurization / non-pressurization and pressurization of the dresser body by the electrode tip with the controller, and it can be applied to welding equipment where many welding machines are arranged. Thus, the electrode tips of the individual welders can be sequentially polished.

The controller of the chip dresser according to claim 2 is separate from the dresser main body, and when the start switch means gives an instruction to start the dressing, the chattering preventing means outputs a dress start instruction signal, and the start signal generating means and the timing. The generating means and the holding means generate a start signal and a timing signal in a predetermined pressurization pattern, and the dressing pressure setting means sets the pressing force (dressing pressure) of the dresser body by the electrode tip according to the timing signal, and the switching means. Since the pressurization of the dresser body is controlled according to the start signal, the dresser body can be driven to polish the electrode tip while the electrode tip of the welding machine is being pressed. The welding force set by the dressing pressure setting means can be switched by the switching means, and the welding machine can Flip and it is possible to set the dress pressure can be applied to the welding equipment in which a large number of welders are arranged, polished sequentially appropriate dress pressure the electrode tip of the individual welder.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is an overall system configuration diagram showing an embodiment of the present invention, FIG. 2 is a block diagram of a controller, FIG. 3 is a circuit diagram showing details of a chattering prevention circuit, a start signal generation circuit and a malfunction prevention circuit of FIG. 4 is a circuit diagram showing details of the timing generation circuit of FIG. 2, FIG. 5 is a circuit diagram showing details of the chip dress pressure setting circuit and main pressurization switching circuit of FIG. 2, and FIG.
FIG. 3 is a circuit diagram showing details of the pressurizing valve switching circuit of FIG. 2 and the like.

This tip dresser comprises a dresser main body 2 having a cutting tool for polishing the electrode tips 1a, 1b of the upper gun 1A and the lower gun 1B of the welding machine, and the dresser main body 2 is used to cut the electrode tips 1a, 1b. A controller 3 that controls the dressing, an electropneumatic proportional valve 4 that is controlled by the controller 3 and sets the pressing force (dressing pressure) of the dresser body 2 by the electrode tips 1a and 1b during the dressing, and the controller 3 The controller 3 includes a dressing start switch 5 which is a starting switch means for outputting a dressing pressure signal S1 for instructing a dressing start to the controller 3
And the electro-pneumatic proportional valve 4 are integrated as a controller unit 6 and are separate from the dresser main body 2.

The dress starting switch 5 outputs a dress pressurizing signal S1 to the controller 3, and the controller 3 pressurizes the electropneumatic proportional valve 4 in response to the dress pressurizing signal S1 from the dress starting switch 5. A level setting signal S2 is output to output a required air pressure from the electropneumatic proportional valve 4, and a pressurizing signal S3 for switching pressurization / non-pressurization is output to the pressurizing solenoid valve 7 of the welding machine. Electrode tip 1
The cylinder 8 that drives a and 1b is driven.

As shown in FIG. 2, the controller 3 includes a chattering prevention circuit 31 which is chattering prevention means, a start signal generation circuit 32 which is start signal generation means,
Timing generation circuit 33, which is timing generation means, hold command circuit 34, which is holding means, and logic circuit 3.
5, an interface circuit 36 and a chip dress pressure setting circuit 37 which are dressing pressure setting means, a main pressurization switching circuit 38 which is a pressurizing pressure switching means, a pressurizing valve switching circuit 39 which is a switching means, and a malfunction prevention circuit 40. There is.

The chattering prevention circuit 31 outputs an output signal of the dressing start switch (PB) 5 (dressing pressure signal S1).
Are shaped to generate a dress start signal S5, and the dress start signal S5 is generated via the logic circuit 35 to the start signal generation circuit 3
Output to 2. The activation signal generation circuit 32 inputs a dress start signal S5 from the chattering prevention circuit 31 and a hold command signal S8 from a hold command circuit 34, which will be described later, via a logic circuit 35, and based on each of these input signals, an electrode chip. A start signal S6 for pressurizing the dresser main body 2 is generated by 1a and 1b, and the start signal S6 is output to the timing generation circuit 33 and the pressurization valve switching circuit 39.

The timing generation circuit 33 generates a timing signal S7 according to a predetermined pressurizing pattern based on the activation signal S6 from the activation signal generation circuit 32, and a chip via the hold command circuit 34 and the interface circuit 36. It is output to the dressing pressure setting circuit 37. Hold command circuit 3
4 is a timing signal S from the timing generation circuit 33.
The hold command signal S8 for holding the start signal S6 output from the start signal generation circuit 32 according to
Is output to the activation signal generation circuit 32 via.

Here, the "predetermined pressurization pattern" indicates the relationship between the dressing pressure and the time for applying the dressing pressure. In this embodiment, the pressurizing force is prepressurized, main pressed, The finishing pressure is set in three stages (see FIG. 10), the time for applying the pre-pressurizing force is the pre-pressurizing time, and the time for applying the main pressurizing force is the main pressurizing time, and the timing generation circuit 33 The timing signals for the pre-pressurization time and the main pressurization time are generated by.

The tip dressing pressure setting circuit 37 responds to the timing signal S7 from the timing generating circuit 33 (for main pressurization, also according to the switching result of the main pressurization switching circuit 38), and dressers by the electrode chips 1a and 1b. A pressure level setting signal S2, which is a voltage signal for setting the pressure of the main body 2, is output to the electropneumatic control valve 5. The pressurizing valve switching circuit 39 sends the pressurizing signal S to the pressurizing solenoid valve 7 in response to the starting signal S6 from the starting signal generating circuit 32.
3 is output to switch pressurization / non-pressurization of the dresser main body 2 by the electrode tips 1a and 1b.

The malfunction prevention circuit 40 has a dress start signal S1 from the chattering prevention circuit 31 when the dress power is turned on.
And blocking signals S9 and S10 for blocking the output of the starting signal S6 from the starting signal generating circuit 32.

Next, the details of each part will be described with reference to FIG. 3 and subsequent figures. First, referring to FIG. 3, the dress start switch 5 includes an a (normally open) contact 5 a and a b (normally closed) contact 5.
It is a push button (PB) type switch having b.
The chattering prevention circuit 31 includes pull-up resistors R1 and R2 for pulling up the normally-open contact 5a and the normally-closed contact 5b of the dress start switch 5 to the power source Vcc, and a negative edge going type JK flip-flop (hereinafter referred to as "JK flip-flop"). "FF") circuit 51, AND circuit 52, and capacitor C1.

The FF circuit 51 has a J terminal, a K terminal, and a CK.
Ground the (clock) terminal, input the output signal (dress pressurizing signal) S1a of the normally open contact 5a of the dress start switch 5 to the preset (PR) terminal, and normally close the dress start switch 5 to the clear (CLR) terminal. The output signal (dress pressurizing signal) S1b of the contact 5b is input through the AND circuit 52.

The AND circuit 52 outputs the normally closed contact 5b of the dress start switch 5 when the blocking signal S9 output from the malfunction prevention circuit 40, which will be described later, is at a high level H (hereinafter simply referred to as "H"). It is a gate circuit that passes the output signal S1b. The Q output of the FF circuit 51 is output to the start signal generation circuit 32 as the dress start signal S5a, and the inverted Q output is output to the start signal generation circuit 32.

The start signal generating circuit 32 is a negative edge going type JK FF circuit 53, a Schmitt trigger inverter 54, and NOR gate circuits 55 and 5.
6 The FF circuit 53 has a J terminal, a K terminal and a P terminal.
The R terminal is connected to the power supply Vcc, the output of the logic circuit 35, which is a NOR gate circuit, is input to the CK terminal via the Schmitt trigger inverter 54, and the blocking signal S9 from the malfunction prevention circuit 40 is input to the CLR terminal. The logic circuit 35 includes a dress start signal S5b, which is an inverted Q output of the FF circuit 51 of the chattering prevention circuit 31, and a hold command circuit 34.
The hold command signal S8 from is input.

The Q output of the FF circuit 53 and the dress start signal S5a which is the Q output of the FF circuit 51 of the chattering prevention circuit 31 are input to the NOR gate circuit 55, and the output of the NOR gate circuit 55 is used as the malfunction prevention circuit 40. The blocking signal S10 is output as the activation signal S6 via the NOR gate circuit 56 having the other input.

On the other hand, the malfunction prevention circuit 40 includes a resistor R3,
Delay circuit 5 consisting of capacitor C2 and diode D1
9 and the Schmitt trigger inverters 60 to 62, the delay circuit 59 delays the rise of the power supply Vcc, and the blocking signal S9 obtained through the Schmitt trigger inverters 60 and 61 is used as the AND circuit 52 and the start signal of the chattering prevention circuit 31. The blocking signal S9 is output to the FF circuit 53 of the generation circuit 32, and the blocking signal S10 obtained through the Schmitt trigger inverter 62 is output to the NOR gate circuit 56 of the start signal generation circuit 32.

Next, with reference to FIG. 4, the timing generation circuit 33 includes a pre-pressurizing monomulti 63 including a dual retriggerable monostable multivibrator.
And a variable resistor VR1, a resistor R5, and a capacitor C for setting the pulse width (pre-pressurization time) of the mono-multi 63.
3 and a mono press 64 for main pressurization, which is composed of a dual retriggerable monostable multivibrator,
Variable resistor VR2, resistor R6, capacitor C4 for setting the pulse width (main pressurization time) of the monomulti 64.
And AND circuits 65 and 66, an integrating circuit 67 including a resistor R7 and a capacitor C5, and a Schmitt trigger inverter 68.

The starting signal S6 from the starting signal generating circuit 32 is inputted to the pre-pressurizing mono-multi 63, and the integrating circuit 67 which integrates the signal S12 which is the inverted Q output of the pre-pressing mono-multi 63 and the starting signal S6. The integrated output S13 of
It is input to the D circuit 65 and the output of the AND circuit 65 is input to the main pressurizing monomulti 64.
Inverted Q output (signal) S12, mono press 64 for main pressurization
The inverted Q output (signal) S14 and the integration output S13 of the integration circuit 67 are input to the AND circuit 66.

Then, the reversal Q of the mono-multi 63 for pre-pressurization
Output S12, inverted Q output S1 of mono-multi 64 for main pressurization
4 and the output S16 obtained by inverting the output S18 of the AND circuit 66 by the Schmitt trigger inverter 68, the chip dress pressure setting circuit 3 via the interface circuit 36, respectively.
7, the Q output S17 of the main pressurizing monomulti 64 and the output S18 of the AND circuit 66 are input to the hold command circuit 34.

The hold command circuit 34 is composed of a NOR gate circuit, and inputs the Q output S17 of the main pressurizing monomulti 64 and the output S18 of the AND circuit 66 as described above,
The hold command signal S8 is output to the logic circuit 35 described above.

Next, referring to FIG. 5, the interface circuit 36 includes an inverted Q output S12 of the pre-pressurizing monomulti 63 of the timing generation circuit 33, an inverted Q output S14 of the main pressurizing monomulti 64, and a Schmitt trigger inverter. 68 output S16 and the start signal S from the start signal generation circuit 32.
It is composed of four photocouplers 71 to 74 for inputting 6 and a resistor R8.

The chip dressing pressure setting circuit 37 is composed of a resistor R10 connected to the output side of the photocoupler 71 of the interface circuit 36, a variable resistor VR3 and a resistor R9, and a prepressurizing force level setting unit composed of a diode D2, and a photocoupler. A resistor R11 connected to the output side of 72, and variable resistors VR4a and VR, one of which is selected by the main pressure switching circuit 38.
4b, VR4c, resistor R9 and diodes D3a to D3
main pressurizing force level setting unit composed of c, a resistor R12 connected to the output side of the photocoupler 73, and a variable resistor VR.
5, a finishing pressure force level setting unit including a resistor R9 and a diode D4, and a gun release pressure setting unit including a variable resistor VR6 and a resistor R13 and a diode D5 connected to the output side of the photocoupler 74, and a variable resistor VR3. , V
A voltage signal corresponding to the resistance value of R4a, VR4b, VR4c, VR5, VR6 is output to the electropneumatic proportional valve 4 as a pressing force level setting signal S2.

The pressurization switching circuit 38 includes a resistor R11 of the chip dress pressure setting circuit 37 and variable resistors VR4a, VR4b,
It is composed of a three-contact rotary switch 75 which is rotatable between the VR4c and the VR4c and can be rotated by manual operation.
Either R4b or VR4c is selected.

Next, referring to FIG. 6, the pressurizing valve switching circuit 39 includes a switching transistor TR.
1, a phototriac 76, a surge absorbing element 77, and resistors R14 and R15. The activation signal S6 from the activation signal generation circuit 32 is supplied to the transistor TR via the resistor R14.
1, and the output end of the phototriac 76 is inserted in the power feeding path to the pressurizing solenoid valve 7 to switch the light emitting element side.

Next, the operation of the chip dresser system configured as described above will be described with reference to FIG. 7 and subsequent figures. First, after the power is turned on, when the voltage across the capacitor C2 of the malfunction prevention circuit 40 rises to a predetermined level,
The blocking signal S9 becomes low level "L" (hereinafter simply referred to as "L"), the blocking signal S10 becomes "H", and the gate of the AND circuit 52 of the chattering prevention circuit 31 is opened.

Under this condition, when the dress start switch 5 is pushed down, the output signal S1a of the normally open contact 5a becomes "L".
Then, the output signal S1a is input to the PR terminal of the FF circuit 51, and the output signal S1b of the normally closed contact 5b is "H".
Then, the AND circuit 52 whose output signal S1b is in the open state
Is input to the CLR terminal of the FF circuit 51 via.

In this case, since chattering occurs at each contact of the push button type dressing start switch 5, when the dressing start switch 5 is pushed down, the normally open contact 5a of the dress start switch 5 is pushed as shown in FIG. The output signal S1a becomes stable after becoming chattering from "H" and then becomes "L" as shown in FIG. 7A, and at this time, the output signal S1b of the normally closed contact 5b is as shown in FIG. In addition, chattering occurs from "L" earlier than the operation of the normally open contact "a" by a predetermined time t1 and then becomes "H", which is stable. When the pressing of the dress start switch 5 is released, the normally open contact 5a returns faster than the normally closed contact 5b as shown in the figure, and the output signal S1a chatters to a stable state. After a delay, the output signal S1b causes chattering and shifts to a stable state.

Since the J terminal and the K terminal of the FF circuit 51 are both "H", the PR terminal is "L" and the CL terminal is CL.
When the R terminal becomes "H", the Q output is set to "H" and P
Q when the R terminal is "H" and the CLR terminal is "L"
Set the output to "L". Therefore, when the dress starting switch 5 is pushed down from the FF circuit 51 as shown in FIG. 7C, it becomes "H" from the time when the normally open contact 5a is closed, and when the pushing down of the dress starting switch 5 is released. , When the normally closed contact 5b is closed, a Q output that becomes “L” is obtained, and this Q output is output as the dress start signal S5a. As shown in FIG. Is output as the dress start signal S5b.

As described above, the dress start switch 5 which is a push button type switch having the a contact and the b contact.
By combining output signals including chattering at each contact of the dress start switch 5 using a circuit including the resistors R1 and R2 and the FF circuit 51, a dress start signal with chattering removed can be obtained. Then, by using such a push button type switch as the starting switch, it is possible to facilitate the inching operation at the time of pre-pressurization, as described later.

Next, the starting signal generating circuit 32 is output by the clock input of the FF circuit 53 when the input signal to the Schmitt trigger inverter 54 (the output signal of the logic circuit 35) changes from "L" to "H". Is reversed, so
As shown in (a) and (b), the chattering prevention circuit 31 causes the dressing start signal S by pressing down the dressing start switch 5 and issuing a dressing start command (pressurizing command).
5a and S5b are output. When the blocking signal S9 from the malfunction prevention circuit 40 is "L", the dress start signal S5a from the chattering prevention circuit 31 becomes "H", so that the output of the NOR gate circuit 55 becomes FF circuit 5.
NOR gate circuit 5 which becomes "L" regardless of the Q output of 3
The start signal S6 which is the output of 6 becomes "H" as shown in FIG. When the activation signal S6 becomes "H", the pressurizing valve switching circuit 39 is turned on and power is supplied to the pressurizing solenoid valve 7.

Therefore, as will be described later, when a predetermined time (pre-pressurization time) t2 elapses from the rising of the start signal S6 from the hold command circuit 34 as shown in FIG. After that, a hold command signal S8 that becomes "H" is output when a predetermined time (time until the start signal S6 becomes "L" by pressing the dress start switch 5 again) elapses. Then, until the pre-pressurization time t2 elapses, the output of the logic circuit 35 is maintained at "L", so that the output of the FF circuit 53 is not inverted, and the outputs shown in FIGS. As shown by the broken line, every time the dress start signal S5a from the chattering prevention circuit 31 becomes "H", the activation signal S6 becomes "H".

As a result, between the pressing of the dress starting switch 5 and the elapse of the pre-pressurization time, the pressing and non-pressurizing of the dress starting switch 5 is repeated to control the switching between pressurization and non-pressurization. (Inching operation) can be performed, and the electrode chips 1a and 1b can be aligned with each other so that the dresser body 2 fits well.

Then, when the pre-pressurization time t2 elapses while the dress start switch 5 is being pressed, the hold command signal S8 changes from "H" to "L", at which time it is shown in FIG. As described above, since the dress activation signal S5b is "L", the output of the logic circuit 35 changes from "L" to "H".
Then, the clock is input to the FF circuit 53, and the Q output of the FF circuit 53 becomes “H”. Therefore, even if the pressing of the dress start switch 5 is released thereafter and the dress start signal S5a of the chattering prevention circuit 31 becomes "L", the output of the NOR gate circuit 55 is held at "H" and the NOR gate The activation signal S6, which is the output of the circuit 56, also remains held at "H".

Therefore, after the pre-pressurization time t2 has elapsed, even if the release start switch 5 is released and the depression is released, the start signal S6 of the start signal generation circuit 32 is held and the electrode chips 1a, Since the pressure applied to the dresser main body 2 by 1b is maintained, it is possible to concentrate on the dressing work.

Then, under this condition, the dress starting switch 5 is pressed down again to input the clock to the FF circuit 53, the Q output thereof becomes "L", and the starting signal S6 from the NOR gate circuit 56 becomes "L". That is, the activation signal S6 is not output.

Here, the malfunction prevention circuit 40 will be explained. The chattering prevention circuit 3 is directly connected to the power source Vcc.
If the CLR terminals of the FF circuit 51 of No. 1 and the FF circuit 53 of the activation signal generation circuit 32 are input, the CL of the FF circuits 51 and 53 is turned on when the controller 3 is powered on.
Since the dress is executed for one cycle before the R terminal becomes “H” and the dress start switch 5 is pressed, the delay circuit 59 including the resistor R3, the capacitor C2 and the diode D1 and the three Schmitt trigger inverters. By providing a combination, this controller 3
When the power is turned on, a blocking signal S9 that becomes “H” is output after a lapse of a predetermined delay time, and the FF circuit 51 and the activation signal generation circuit 32 of the chattering prevention circuit 31 are output.
The FF circuit 53 is provided with an "L" input to the CLR terminals of the FF circuits 51 and 53 for a sufficient time for resetting to prevent malfunction.

Next, the timing generation circuit 33 operates as shown in FIG.
When the activation signal S6 from the activation signal generation circuit 32 is input (becomes "H") as shown in (a), as shown in FIG.
1, a signal S1 which becomes “L” for a predetermined time (pre-pressurization time t2) determined according to each value of the resistor R5 and the capacitor C3
2 is output, and the signal S1 of the premultiplying monomulti 63 is output.
When 2 rises to "H", as shown in FIG. 7C, a predetermined time (main pressurization time t3) determined from the main pressurizing monomulti 64 according to the values of the variable resistor VR2, the resistor R6 and the capacitor C4. Signal S, which is an inverted Q output that only becomes “L”
14 is output.

Here, since the pre-pressurization monomulti 63 and the main pressurization monomulti 64 need to be reset when the start signal is not input, each monomulti 63,
The activation signal S6 must be input to the CLR terminal 64. However, when the activation signal S6 is input to the CLR terminals of the pre-pressurizing mono-multi 63 and the main pressurizing mono-multi 64 in this way, the reverse Q of the pre-pressurizing mono-multi 63 is obtained.
When the output (signal S12) is directly input to the main pressurizing mono-multi 64, that is, when two mono-multis serving as timers are simply combined to generate a timing corresponding to a predetermined pattern, the result shown in FIG. As shown in the figure, a delay time Δt1 occurs between the time when the activation signal S6 is input due to the transient characteristics of the mono-multi and the time when the inverted Q output of the pre-press mono-multi 63 becomes “L”.
When the start signal S6 is input, the inconvenience arises in that the main pressurizing mono-multi 64 also operates as shown by the broken line in FIG.

Therefore, in the present embodiment, by providing an AND circuit 65 for ANDing the starting signal S6 and the inverted Q output (signal S12) of the pre-pressurizing monomulti 63, the starting signal S6 is in the "H" state. Thus, when the inverted Q output of the pre-pressurizing monomulti 63 changes from "L" to "H", the main pressurizing monomulti 64 starts to operate to prevent malfunction due to the transient effect. .

In the timing generating circuit 33, the inverted Q output of the pre-pressurizing monomulti 63, the inverted Q output of the main pressurizing monomulti 64 and the output of the AND circuit 66 for inputting the start signal S6 and the main pressurizing operation are input. Mono Multi 64 Q
The output and the output are input to the hold command circuit 34 that generates the hold signal S8.

In this case, the activation signal S6 is ANDed as it is.
When input to the circuit 66 and the AND circuit 65, when the activation signal S6 is input from the hold command circuit 34 due to the transient effect described above, the output of the AND circuit 66 is "H" as shown by the broken line in FIG. 9 (e). Becomes (AND
The output of the circuit 65 is also the same), and one pulse is output from the hold command circuit 34 as the hold command signal S8 as indicated by the broken line in FIG.
As described above, the clock signal is input to the FF circuit 53, and the activation signal S6 is held. as a result,
Not only is inching operation impossible during the pre-pressurization time,
After that, even if the dress starting switch 5 is pressed, the monomultis 63, 64 of the timing generation circuit 33 cannot be reset.

Therefore, the activation signal S6 is not directly input to the AND circuits 66 and 65, but the integration circuit 6
7 is provided and the output obtained by integrating the start signal S6 is AND circuit 6
6 and the AND circuit 65, the output of the integration circuit 67 (signal S13) is "H" until the inverted Q output of the monomulti 63 becomes "L" as shown in FIG. 9 (f). Therefore, it is possible to prevent the hold command signal S8 from being output during the delay time due to the transient effect.

Next, referring to FIG. 5, the chip dress pressure setting circuit 37 outputs the signal S12 from the pre-pressing mono-multi 63.
Since the photocoupler 71 of the interface circuit 36 is in the ON state while is “L”, the voltage signal corresponding to the resistance value determined by the resistors R9 and R10 and the variable resistor VR3 is electropneumatically proportional as the pressing force level setting signal S2. The pressure is output to the valve 4 to set the pressing force at the time of pre-pressurizing the dresser main body 2 by the electrode tips 1a and 1b.

Further, since the photo coupler 72 is in the ON state while the signal S14 from the main pressurizing mono-multi 64 is "L", the resistance is changed depending on the selected position of the rotary switch 75 of the main pressurizing switching circuit 38. R9, R11 and variable resistor VR
The voltage signal corresponding to the resistance value determined by any of 4a to VR4c is used as the pressing force level setting signal S2 and the electropneumatic proportional valve 4
To set the pressing force for the main pressurization of the dresser main body 2 by the electrode tips 1a and 1b.

Further, while the signal S16 (the inverted signal of FIG. 9 (e)) from the Schmitt trigger inverter 68 is "L", the photocoupler 73 is in the ON state, so that the resistance R9,
The voltage signal corresponding to the resistance value determined by R12 and the variable resistor VR5 is used as the pressing force level setting signal S2 and the electropneumatic proportional valve 4
To set the pressing force at the time of finishing the dresser main body 2 by the electrode tips 1a and 1b.

Therefore, by adjusting the variable resistors VR3 to VR5, it is possible to set the pre-pressurizing force, the main pressurizing force, and the post-main pressurizing (finishing pressure) pressurizing force. The pressurization switching circuit 38 can switch and set the pressurizing force at the time of main pressurization. As a result, when applied to welding equipment equipped with a large number of welders such as table tops and general welders with different gun shapes and cylinder capacities of each welder, it is possible to adjust the gun shape and cylinder capacity of each welder. The pressurizing force at the time of main pressurization can be set, and the electrode chip can be dressed with an appropriate pressurizing force.

By using the photocoupler and the diode array to generate one output signal as described above, the occupied space on the substrate can be reduced as compared with the case where the switching relay is used, and the resistance and the variable resistance can be reduced. A wide adjustment range can be obtained by combining

In the chip dress pressure setting circuit 37, since the photo coupler 74 is turned on when the activation signal S6 from the activation signal generation circuit 32 is not input, the resistance values of the variable resistors VR6 and R13 are set. A corresponding voltage signal is output to the electropneumatic proportional valve 4 as the dressing pressure setting signal S2 to set the gun release pressure when the gun is released.

The tipless operation procedure using the controller 3 will now be described with reference to FIG. 10 as well. The electropneumatic proportional valve 4 of the controller unit 6 is connected to the pressurizing solenoid valve 7 by piping to the air supply path. After that, the rotary switch 75 of the main pressurization switching circuit 38 is switched according to the gun shape and cylinder capacity of the welding machine to select an appropriate main pressurizing force.

Then, the dresser body 2 is set on the electrode tip 1b on the lower side of the welding machine, and the dress start switch 5
When is pressed, the dress pressure signal S1 as shown in FIG.
(Dress command) is input to the chattering prevention circuit 31 of the controller 3, the chattering prevention circuit 31 outputs a dress start signal S5, the start signal generation circuit 32 outputs a start signal S6, and FIG. As shown, the pressurizing valve switching circuit 39 operates the pressurizing solenoid valve 7 to open the air supply path, so that the upper gun 1A of the welding machine descends and the dresser body 2 is sandwiched between the electrode tips 1a and 1b. Is pressurized. At this time, the pressurizing force (chip dressing pressure) is a static pressure level setting signal S2 for setting the pressurizing force at the time of pre-pressurization by the chip dressing pressure setting circuit 37 according to the signal S12 from the timing generation circuit 33. Since it is output to the proportional valve 21, it is set to a pre-pressurizing pressure.

In this case, when a problem such as alignment between the electrode tips 1a and 1b and the dresser body 2 occurs,
Since the inching operation is possible during the pre-pressurization as described above, by releasing the depression of the dress start switch 5, the upper gun 1A of the welding machine is opened and the dresser body 2 is pressed by the electrode tips 1a and 1b. Is stopped, the position can be adjusted by pressing the dressing start switch 5 again.

Here, as shown in FIG. 7C, the pressurizing force is set so that the main pressurizing force is higher than the prepressurizing pressure and the finishing pressure is lower than the prepressurizing force. Switch 5
If you perform dressing operation with the dresser main body 2 while pressing,
It feels light at the initial pre-pressurization, and heavier when shifting to the main pressurization in the middle. Therefore, when the dress starting switch 5 is released, the self-holding state is held as described above, so that the user can concentrate on the dressing work.

Further, if the dressing work is continued, the repetitive work becomes lighter when the pressure is changed to the finishing pressure. Therefore, after the dressing work is performed several times, the dressing start switch 5 is pushed,
The upper gun 1A is opened and the dressing work is completed.

[0062]

As described above, according to the tip dresser of the first aspect, the dresser body for polishing the electrode tip and the pressurization / non-pressurization and the pressurization force of the dresser body by the electrode tip of the welding machine are controlled. It consists of a controller separate from the dresser body, and this controller is equipped with an electro-pneumatic proportional valve that sets the air pressure supplied to the actuator that drives the electrode tip. By connecting to the air supply path to the actuator that drives the, the controller can control the pressure / non-pressurization and pressure of the electrode body by the electrode tip, and the electrode tip can be polished by the dresser body, and a large number of weldings can be performed. It can be applied to the welding equipment in which the machine is arranged to sequentially polish the electrode tips of the individual welders.

According to another aspect of the controller of the chip dresser of the present invention, the dresser main body is separate from the dresser main body, and when the start switch means gives an instruction to start dressing, the chattering prevention means outputs a dress start instruction signal, and the start signal generating means. The timing generation means and the hold means generate a start signal and a timing signal in a predetermined pressurization pattern, and the dressing pressure setting means sets the pressing force (dressing pressure) of the dresser body by the electrode tip according to the timing signal, Since the pressurization of the dresser body is controlled by the switching means according to the activation signal, the dresser body can be driven and the electrode tip can be polished while the dresser body is pressurized by the electrode tip of the welding machine. The pressing force switching means can be used to switch the pressing force set by the dressing pressure setting means. It is possible to set the dress pressure according to the machine, can be applied to the welding equipment in which a large number of welders are arranged, polished sequentially appropriate dress pressure the electrode tip of the individual welder.

[Brief description of the drawings]

FIG. 1 is an overall system configuration diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram of a controller

FIG. 3 is a circuit diagram showing details of a chattering prevention circuit, a start signal generation circuit, and a malfunction prevention circuit of FIG.

FIG. 4 is a circuit diagram showing details of the timing generation circuit of FIG.

5 is a circuit diagram showing details of the chip dress pressure setting circuit etc. of FIG.

6 is a circuit diagram showing details of the pressure valve switching circuit and the like of FIG.

FIG. 7 is a timing chart for explaining the operation of the chattering prevention circuit.

FIG. 8 is a timing diagram used for explaining the operation of the start signal generation circuit and the holding means.

FIG. 9 is a timing diagram for explaining the operation of the timing generation circuit and the holding means.

FIG. 10 is an explanatory diagram for explaining tip dressing work.

[Explanation of symbols]

1A ... upper gun, 1B ... lower gun, 1a, 1b ... electrode tip, 2 ... dresser body, 3 ... controller, 4 ... electropneumatic proportional valve, 5 ... dress start switch, 6 ... controller unit, 7 ... pressurizing solenoid valve , 31 ... Chattering prevention circuit, 32 ... Activation signal generation circuit, 33 ... Timing generation circuit, 34 ... Hold command circuit, 35 ... Logic circuit, 37 ... Chip dress pressure setting circuit, 38 ... Main pressurization switching circuit, 39 ... Addition Pressure valve switching circuit, 40 ... Malfunction prevention circuit.

Claims (2)

[Claims] 1. A tip dresser for polishing an electrode tip of a welding machine, wherein a dresser body for polishing the electrode tip and pressurization / non-pressurization and pressurization force of the dresser body by the electrode tip of the welder are controlled. A chip dresser comprising a controller separate from the dresser main body, the controller having an electropneumatic proportional valve for setting an air pressure supplied to an actuator for driving the electrode tip. 2. A tip dresser controller having a dresser body for polishing an electrode tip of a welding machine, comprising:
This controller is separate from the dresser body,
Start switch means for instructing dress start, chattering prevention means for shaping the output of the start switch means to generate and output a dress start signal, and the dresser by the electrode tip based on the dress start signal from the chattering prevention means. A start signal generating means for generating a start signal for pressurizing the main body, a timing generating means for generating and outputting a timing signal according to a predetermined pressurizing pattern based on the start signal from the start signal generating means, and the timing generation Holding means for holding the activation signal output from the activation signal generating means in response to the timing signal from the means, and dress for setting the pressing force of the dresser body by the electrode tip in response to the timing signal from the timing generating means. Pressure setting means and start signal from the start signal generating means In accordance with the above, the chip is provided with a switching means for switching and controlling the pressurization / non-pressurization of the dresser body by the electrode tip, and a pressurizing force switching means for switching the pressurizing force set by the dressing pressure setting means. Dresser controller.