JPS63194856A - Operation control circuit in casting machine - Google Patents

Abstract

PURPOSE:To automatically control a casting machine without malfunction and to execute safe use by making centrifugal rotation to a mold for the required time, which is set by a timer, by receiving a melt completion signal. CONSTITUTION:After charging metal in a crucible, an open/close part is closed and then a close signal (a) is outputted to a confirming control circuit 1. At the time of operating the confirming switch 4, the confirming control circuit 1 outputs a preparing completion signal (c) by the confirming signal (b). When an inert gas generator 10 receiving a signal (c) injects the inert gas in the box body upper room, a high frequency oscillating circuit 5 is operated, and the metal in the crucible is heated and melted under the inert gas atmosphere, to flow down in a mold. The empty state of the crucible is detected by PLL circuit 6 and the melting completion signal (f) is outputted and the current to the heating coil is turned off. At the same time, centrifugal rotating drive circuit 8 receiving a signal (f) is rotationally moved only for setting time by timer circuit 9 and when the centrifugal rotation is completed, a casting comple tion signal is outputted to the confirming control circuit 1 and this operation is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present application relates to an operation control circuit in a casting machine that casts a walking amount of gold such as dental crowns.

Conventional technology Conventionally, a metal casting machine with a walking capacity such as a dental crown is equipped with a high-frequency heating coil that surrounds a crucible in a housing having an opening and closing part. A crucible having a hole at the bottom through which the subsequent metal falls, a mold provided below the crucible to receive molten metal from the crucible, and a centrifugal rotation drive unit that centrifugally rotates the mold. The molten metal falls through the hole of the crucible and flows into the mold, and the mold is centrifugally rotated to perform casting, or the high-frequency heating coil that can be raised and lowered surrounds the crucible when it rises, and the cylindrical frequency A crucible that melts the metal introduced by induction heating, and a rotary drive unit that centrifugally rotates a holding frame equipped with a mold that is disposed opposite to the outside of the crucible.
When the metal is melted in the crucible, the operator detects this through the monitoring window and lowers the high-frequency heating coil by external operation, and then works with the rotary drive unit to unite the crucible and mold. There is a structure in which molten metal flows from a crucible into a mold by centrifugal rotation to perform casting.

Problems to be Solved by the Invention However, in the conventional centrifugal casting machine described above, each operation such as supplying metal to the crucible, energizing the high-frequency heating coil, or driving the centrifugal rotation of the mold, especially in the latter, requires high-frequency The heating coil is raised and lowered by an operator who monitors it through a monitoring window and sequentially operates switches, etc. according to a set procedure, so if the operator makes a mistake, for example, the work opening and closing surface does not close completely. If the high-frequency heating coil is energized under such conditions, the rotary drive unit is activated when the molten metal does not flow into the mold reliably or the high-frequency heating coil does not descend sufficiently, or the input metal is not sufficiently melted in the crucible. Previously, there was a risk that the power transmission to the high-frequency heating coil would be cut off or the high-frequency heating coil would be lowered.

Means for Solving the Problem Therefore, the present application is designed to prevent malfunctions from occurring during the casting process by making a series of operations for casting mutually related according to the casting process. The gist of this is that there is a high-frequency heating coil that surrounds the crucible in a housing that has an opening and closing part, and that the metal that has been introduced is melted by this high-frequency heating coil.
A crucible with a hole at the bottom for dropping the melted metal,
In a casting machine, which is provided below the crucible and includes a mold that receives the molten metal from the crucible, and a centrifugal rotation drive unit that centrifugally rotates the mold, upon receiving a closing signal from the opening/closing unit, 611 to confirm completion of preparation &1M
Upon receiving a readiness signal from the confirmation control circuit and the confirmation control circuit, the high-frequency heating coil is energized, and it is detected that the melting of the charged metal in the crucible has been completed and that it has fallen into the mold. , a high-frequency oscillator circuit that outputs a melting completion signal that cuts off electricity, and a centrifugal rotation drive circuit that receives the melting completion signal and centrifugally rotates the mold for a required time set by a timer, and the high-frequency oscillation circuit outputs a melting completion signal. The second invention is characterized in that the operation of the high-frequency oscillation circuit is stopped in response to a signal.Furthermore, the second invention includes a high-frequency heating coil that can be raised and lowered and that surrounds the crucible when the crucible is raised, and a high-frequency heating coil that surrounds the crucible when raised. A casting machine comprising a crucible for melting metal introduced by a heating coil, and a rotary drive unit for centrifugally rotating a holding frame equipped with a mold provided opposite to the outside of the crucible,
A heating coil riser which operates a high-frequency liquid heating coil by AND outputting the closing signal of the opening/closing part and the start signal from the star date indicator switch, and outputs a coil set signal when it reaches the raised position surrounding the crucible. A drive circuit, a confirmation control circuit that confirms the completion of melting single tooth by a coil set signal, and a confirmation control circuit that receives a readiness signal from this LM pressure control circuit and energizes the high frequency heating coil, and a high-frequency oscillation circuit that detects that melting of the metal is completed and cuts off the power supply and outputs a melting completion signal; , consisting of a heating coil lowering drive circuit that outputs a lowering completion signal when the lowering position is reached, and a centrifugal rotation drive circuit that centrifugally rotates the crucible receiving the lowering completion signal for a required time set by a timer circuit, The operation of the high frequency oscillation circuit is stopped in response to a melting completion signal from the high frequency oscillation circuit.

Function: When using the first invention, first open the opening/closing part of the casing, put the metal into the crucible, and then
Close the opening/closing part.

Then, the confirmation control circuit outputs a ready signal, and the high-frequency oscillation circuit that inputs this signal is activated, high-frequency current is supplied to the high-frequency heating coil, the metal in the crucible is heated and melted, and the high-frequency oscillation circuit When it is electrically detected that the metal has sufficiently melted and fallen into the casting through the hole and the crucible is empty, the current to the heating coil is cut off, and a melting completion signal is input to rotate the crucible centrifugally. The drive unit centrifugally rotates the mold for a preset length of time using a timer circuit. When this centrifugal rotation is completed, a casting completion signal is output to the confirmation control circuit, and its operation is stopped. /Furthermore, in the second invention, when using the crucible, first open the opening/closing part of the body, put the metal into the crucible, then close the opening/closing part and press the start instruction switch. Then, the heating coil raising drive circuit is activated, and the high frequency heating coil is raised to a position surrounding the outer periphery of the crucible, and in this state, a coil set signal is output. Then, the confirmation control circuit outputs a ready signal based on the coil set signal, and the high frequency oscillation circuit that inputs this signal is activated, high frequency current is supplied to the high frequency heating coil, the metal in the crucible is heated and melted, and the high frequency oscillation circuit is activated. The oscillation circuit is
When the metal state is electrically detected and the metal is sufficiently melted, the current to the heating coil is cut off, a melting completion signal is output to the centrifugal rotation control circuit, and the heating coil receives the melting completion signal. The coil lowering drive circuit operates the lifting actuator to lower the island frequency heating coil to a position that allows centrifugal rotation of the crucible. In this state, a coil lowering signal is output to the centrifugal rotation drive circuit, and the centrifugal rotation drive circuit As a result, the centrifugal rotation drive unit is centrifugally rotated for a preset period of time by a timer circuit, and the molten metal in the crucible flows into the mold. And when this centrifugal rotation is completed, the confirmation control circuit! An i-build completion signal is output, and the operation is stopped.

Example Embodiments of the present application will be described in detail below with reference to the drawings.

As with conventional casting machines, a fixed crucible with a drop-in hole at the bottom and an outer periphery of the crucible are enclosed in a sealed upper chamber of a housing with an opening and closing section on the top used for taking in and out of metal. A high-frequency heating coil is installed in the lower chamber, and the lower chamber includes a centrifugal rotation drive casting unit that is located directly below the crucible and is equipped with a tA type that receives the molten metal that falls from the drop hole of the crucible, and a power source. and other attached mechanism parts necessary for casting are mounted 611. Figure 1 shows the above 5
(1) shows the operating circuit of a casting machine with a configuration in which the closing signal a from the opening/closing section switch (2) which detects the closed state of the opening/closing section and the presence or absence of metal thrown into the crucible are checked from the monitoring window. This shows a confirmation control circuit that receives a confirmation signal from a confirmation switch (4) operated by an operator and outputs a completion signal C, for example, and lights up an indicator lamp. Upon receiving a stop signal d from a casting stop switch (3) at a time and a casting end signal e from a centrifugal rotation drive circuit (8), which will be described later, the signal output is stopped and subsequent operations are stopped. (5) indicates a high-frequency oscillation circuit that applies a high-frequency current to the heating coil based on the 'J = bTj completion signal from the confirmation control circuit (1), and the high-frequency oscillation circuit (5) is connected to the inside of the crucible. Equipped with a P, L, 12 circuit (6) that detects the phase change of the high frequency current flowing through the coil as the metal melts and outputs a melting completion signal, and also stops energizing the high frequency heating coil in the event of an abnormality. The operation is stopped in response to the melting stop signal g from the abnormal melting stop switch (7) or the melting completion signal f from the Psl-<L circuit (6), and the metal in the crucible is sufficiently melted. When the mold falls into the mold and becomes empty, the power supply to the heating coil 11 is cut off. (8) receives the melting completion signal r from the P, L, L circuit (6). , and shows a centrifugal rotation drive circuit that actually operates to centrifugally rotate the mold for a preset required time by a timer circuit (9), and this centrifugal rotation drive circuit (8) operates after the rotation of the centrifugal rotation drive section is completed. , the confirmation control circuit (1)
The SR construction end signal e is output to the circuit (1), and the circuit (1) is reset. (10) is an inert gas which blows out inert gas into the housing for the required time in response to the preparation completion signal C from the confirmation control circuit (1) or the blowout command signal from the inert gas blowout command switch (11). It is a generator.

However, when using it, first open the opening and closing part of the casing,
After putting the metal into the crucible, close the opening/closing part. Then, the closing signal a is output to the confirmation control circuit (1), and in this state, the operator confirms the presence or absence of metal in the crucible and operates the confirmation switch (4), which causes the confirmation control circuit (
1) outputs a ready signal C in response to a confirmation signal and lights up an indicator lamp. Then, upon receiving the 'L$0iit completion signal C, the inert gas generator (10) spouts inert gas into the upper chamber of the casing regardless of whether or not the jet command switch (11) is operated, and at the same time, the high frequency oscillation circuit (5 ) is activated, an excitation current is supplied to the high-frequency heating coil, and the metal in the crucible is heated and melted in an inert gas atmosphere, and when it is sufficiently melted, it is heated under pressure by the inert gas. The state in which the crucible is empty after flowing down into the mold is P,
L, ■-Circuit (6) electrically detects the melting completion signal f
The centrifugal rotation drive circuit (8
) is rotated for a preset period of time by a timer circuit (9), and when the centrifugal rotation is completed, a casting completion signal is output to the confirmation control circuit (1), and its operation is stopped.

Figure 2 shows an embodiment of the second invention of Book 191, in which the casting machine has a casing with an opening/closing part on the top for taking in and out of metal, and a communicating pipe for molten metal on one side, as in the conventional case. a horizontally rotatable holding frame which faces the crucible and the mold through the support frame and has a palancer on the other side; a drive unit which centrifugally rotates the holding frame; and a drive unit which is movable up and down and surrounds the outer periphery of the crucible when raised. Lifting/lowering operation part of high frequency heating coil, power supply part, etc.
It is equipped with the attached mechanical parts necessary for the 8-model. 2 shows an operation control circuit for the casting machine having the above configuration, and (21) shows an opening/closing part switch (22) for detecting the closed state of the opening/closing part.
) and the start signal l from the start instruction switch (23) operated by the operator to start centrifugal casting, the lifting operation section is activated to raise the high-frequency heating coil. A heating coil-lifting drive circuit (21) is shown, which outputs a coil set signal m when the high-frequency heating coil reaches an operating position surrounding the outer periphery of the crucible. (24)
Check from the monitoring window whether the coil set signal m from the heating coil raising circuit (21) is normal, for example, whether the positional relationship between the high frequency heating coil and the crucible is normal, or whether there is any metal thrown into the crucible, and if necessary. 6I recognition control circuit which outputs a ready signal 0 in response to a confirmation signal n from a confirmation switch (25) operated by the operator and lights up an indicator lamp, for example, and the confirmation control circuit ( 2
4) receives a stop signal from the casting stop switch (26) in the event of an abnormality or an XI manufacturing end signal U from the centrifugal rotation drive circuit (32), which will be described later, and stops outputting the signal, and prevents the subsequent operation. stop. (27) indicates a high frequency oscillation circuit that receives a ready signal 0 from the confirmation control circuit (24) and applies a high frequency current to the heating coil;
The high frequency oscillation circuit (27) includes a P, L, L circuit (28) that detects a phase change in the high frequency current flowing through the coil as the metal in the crucible melts and outputs a melting completion signal p. The operation is stopped in response to a melting stop signal q from the melting stop switch for abnormality (two) that stops energizing the high-frequency heating coil in the event of an abnormality, or a casting preparation signal r from the centrifugal rotation control circuit (30) to be described later. Furthermore, when the metal in the crucible is sufficiently melted, the heating coil is cut off from being energized.

(30) indicates a centrifugal rotation control circuit which receives the melting completion signal p from the P, L, L circuit 28) and outputs a casting preparation signal r, and this casting wheel Ofη signal r is controlled by the high frequency oscillation circuit ( 27) and the heating coil lowering drive circuit (31). The heating coil lowering drive circuit (31)
Upon receiving the casting preparation signal r, the elevating actuator is activated to lower the high-frequency heating coil, and when the high-frequency heating coil reaches a lowered position that allows centrifugal rotation of the crucible, it outputs a coil lowering completion signal S. .

(32) receives the coil lowering completion signal S in the heating coil lowering drive circuit (31), and the timer circuit (
33) shows a centrifugal rotation drive circuit which centrifugally rotates a holding frame equipped with a crucible and a mold by operating the centrifugal rotation drive unit for a preset required time period, and this centrifugal rotation drive circuit (32) After the rotation of the centrifugal rotation drive unit is completed, a Sat construction completion signal U is output to the confirmer 1111 circuit (24), and the circuit (24) is reset.

(34) receives an AND signal between the preparation completion signal m from the confirmation control circuit (24) and the ejection command signal This is an inert gas generator that spews out.

However, when using it, first open the opening and closing part of the casing,
After putting the metal into the crucible, close the opening/closing part and press the start instruction switch (23). Then 1,
The heating coil raising drive circuit (21) is activated and the high frequency heating coil is raised to a position surrounding the outer periphery of the crucible, and in this state, the confirmation control circuit (24) turns on the display lamp in response to the coil set signal m, and The ready signal 0 is sent to the inert gas generator (34) and the high frequency oscillation circuit (27).
).

In this example, the operator assists in checking whether there is any metal in the crucible and whether the positional relationship between the heating coil and the crucible is normal and operating the confirmation switch (25). The confirmation signal is configured to be output to the confirmation control circuit (24), and the confirmation control circuit (24) is configured to output a ready signal 0 based on the (II iU signal and the coil set signal m). be.

The inert gas generator (34) is activated by the input of the $ completion signal 0, and inert gas is ejected into the housing.
The low frequency oscillation circuit (27) is activated, an excitation current is supplied to the high frequency heating coil, and the metal in the crucible is heated and melted in an inert gas atmosphere.

Then, the P, L, and L circuits electrically detect this metal melting state and, when the metal is sufficiently melted, cut off the power to the heating coil and output a melting completion signal p to the rotation control circuit (30). Upon receiving this melting completion signal, the centrifugal rotation control circuit (30) outputs a casting preparation signal r to the high-frequency oscillation circuit (27) to stop energizing the high-frequency heating coil, and at the same time, the heating coil lowering drive circuit (31) ) input the casting preparation signal r. Then, the heating coil lowering drive circuit (3
1), the lifting operation section is activated and the high frequency heating coil is activated.
The crucible is lowered to a position that allows centrifugal rotation, and in this state, a coil lowering completion signal S is sent to the centrifugal rotation drive circuit (32).
is output, the centrifugal rotation drive circuit (32) centrifugally rotates the centrifugal rotation drive part for a time preset by the timer circuit (33), and the molten metal in the crucible flows into the mold. When this centrifugal rotation is completed, a casting completion signal k is output to the confirmation control circuit (24) and its operation is stopped.

Effects of the Invention As described above, according to the present application, after the opening/closing part is closed and the start instruction switch is operated, the electric signal is activated so that the signal of the previous stage is not manually operated unless the operation of the previous stage is completed in the casting process. Targeted? 111, it has the advantage of being automatically controlled and safe to use without the risk of malfunction.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, with FIG. 1 being a circuit diagram and FIG. 2 being a circuit diagram of another embodiment. In the figure, (1) and (24) are the fixed F and U control circuits, (2
), (22) j-opening/closing switch, (5), (
27) is a high frequency oscillation circuit, (8) is a centrifugal rotation drive circuit,
(21) is a heating coil raising drive circuit, (23) is a start instruction switch, (31) is a heating coil lowering cantering circuit,
(32) is a centrifugal rotation drive circuit.

Claims (2)

[Claims] (1) A high-frequency heating coil that surrounds the crucible in a housing that has an opening and closing part, and a crucible that has a hole in the bottom that melts the metal introduced by the high-frequency heating coil and allows the melted metal to fall; In a casting machine, which is provided below the crucible and includes a mold that receives the molten metal from the crucible, and a centrifugal rotation drive unit that centrifugally rotates the mold, upon receiving a closing signal from the opening/closing unit, A confirmation control circuit confirms the completion of preparation, and upon receiving a preparation completion signal from this confirmation control circuit, electricity is supplied to the high-frequency heating coil, and melting of the input metal in the crucible is completed and it falls into the mold. The circuit consists of a high-frequency oscillation circuit that outputs a melting completion signal to cut off the electricity when the melting completion signal is detected, and a centrifugal rotation drive circuit that centrifugally rotates the mold for the required time set by a timer in response to the melting completion signal. An operation control circuit for a casting machine, characterized in that the operation of a high frequency oscillation circuit is stopped in response to a melting completion signal from the oscillation circuit. (2) A high-frequency heating coil that can be raised and lowered to surround the crucible when raised in a housing having an opening and closing part, a crucible that melts the metal charged by this high-frequency heating coil, and a crucible provided outside the crucible. In a casting machine equipped with a rotary drive unit that centrifugally rotates a holding frame equipped with a mold, a high-frequency heating coil is raised by an AND output of a closing signal of the opening/closing unit and a start signal from a start instruction switch. A heating coil raising drive circuit outputs a coil signal when the crucible is at a position surrounding the crucible, a confirmation control circuit confirms completion of melting preparation by a coil set signal, and a confirmation control circuit receives a preparation completion signal from this confirmation control circuit. a high-frequency oscillation circuit that energizes a high-frequency heating coil, detects that melting of the metal charged in the crucible is completed, cuts off the energization, and outputs a melting completion signal;
a heating coil lowering drive circuit that is activated by the melting completion signal to lower the heating coil to a position that allows centrifugal rotation of the crucible and outputs a lowering completion signal when the lowering position is reached; An operation in a casting machine comprising a centrifugal rotation drive circuit that centrifugally rotates a receiving crucible for a required time set by a timer circuit, and the operation of the high frequency oscillation circuit is stopped by a melting completion signal from the high frequency oscillation circuit. control circuit.