CN109909476B - Extrusion pin control device and die casting machine having the same - Google Patents
Extrusion pin control device and die casting machine having the same Download PDFInfo
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- CN109909476B CN109909476B CN201811409102.3A CN201811409102A CN109909476B CN 109909476 B CN109909476 B CN 109909476B CN 201811409102 A CN201811409102 A CN 201811409102A CN 109909476 B CN109909476 B CN 109909476B
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- 238000004512 die casting Methods 0.000 title claims abstract description 31
- 238000001125 extrusion Methods 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 claims abstract description 71
- 238000002347 injection Methods 0.000 claims description 22
- 239000007924 injection Substances 0.000 claims description 22
- 230000005856 abnormality Effects 0.000 claims description 7
- 238000013459 approach Methods 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 3
- 239000010720 hydraulic oil Substances 0.000 abstract description 29
- 239000003921 oil Substances 0.000 description 50
- 238000003825 pressing Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 9
- 239000002184 metal Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The invention provides an extrusion pin control device with a simple loop structure and a die casting machine with the same. The squeeze pin control device (30) has a pressurizing cylinder (40) that accommodates a pressurizing piston (41) that advances and retracts a squeeze pin (42), and a detection cylinder (50) that has a detection piston (51) and whose position is detected by a position sensor (52). Further, the switching valve (60) and the switching valve (70) are connected to switch the pressurizing cylinder (40) and the detection cylinder (50) between series connection and parallel connection, and to switch the flow direction of the hydraulic oil between forward (forward) and reverse (reverse).
Description
Technical Field
The present invention relates to an extrusion pin control device and a die casting machine having the same.
Background
Patent document 1 discloses a control device for a pressurizing pin that partially pressurizes a melt filled in a cavity of a mold. The control device includes a supercharger that supplies working oil to a cylinder provided with a pressurizing pin at a tip end of a rod portion. The supercharger is constituted by a single-rod cylinder and has a supercharging piston. The control device detects the position of the booster piston by a sensor provided in the booster, and confirms whether or not the rod portion of the cylinder is retracted based on the position of the booster piston.
Documents of the prior art
Patent document
Patent document 1: japanese patent No. 4520007
Disclosure of Invention
Problems to be solved by the invention
With the control device, the cylinder and the supercharger are returned to the original points at the end of the operation and are ready for the next operation. Therefore, the supercharger and the cylinder are connected in series during the pressurizing operation, and the supercharger and the cylinder are connected in parallel during the return operation. However, in the above control device, a plurality of on-off valves for switching the circuit are required, and the circuit configuration is complicated.
Accordingly, an object of the present invention is to provide a squeeze pin control device having a simple circuit structure and a die casting machine having the squeeze pin control device.
Means for solving the problems
In order to achieve the above object, an extrusion pin control apparatus according to an aspect of the present invention is characterized in that,
comprising:
a pressurizing cylinder which accommodates a pressurizing piston for advancing and retreating the extrusion pin,
a detection cylinder accommodating a detection piston,
a position sensor that detects a position of the detection piston,
a connection switching valve having an A port, a B port, a P port and a T port, and at least having a parallel connection position where the A port is communicated with the T port and the B port is communicated with the P port, and a series connection position where the A port is communicated with the P port and the B port is cut off from the T port,
the reversing valve is provided with an A port, a B port, a P port and a T port, and at least comprises a backward flowing position where the A port is communicated with the P port and the B port is communicated with the T port and a forward flowing position where the A port is communicated with the T port and the B port is communicated with the P port,
a first flow path connecting the rear oil chamber of the pressurizing cylinder and the B port of the selector valve,
a second flow path connecting the front oil chamber of the pressurizing cylinder to the P port of the connection switching valve,
a third flow path for connecting the rear oil chamber of the detection cylinder to the port A of the connection switching valve,
a fourth flow path connecting the front oil chamber of the detection cylinder, the port B of the connection switching valve, and the port A of the selector valve,
a control unit;
the P port of the reversing valve is connected with a pump for supplying working oil,
the T interface of the reversing valve and the T interface of the connecting and switching valve are connected with an oil tank from which working oil is discharged,
the control part
(1) When the pressurizing piston is advanced, the connection switching valve is controlled to be in a series connection position and the direction switching valve is controlled to be in an advanced flow position,
(2) when the pressurizing piston is caused to retreat, the connection switching valve is controlled to be in a series connection position and the direction switching valve is controlled to be in a retreat flow position,
(3) when the pressurizing piston and the detection piston are returned to the original point, the connection switching valve is controlled to be in a parallel connection position and the direction change valve is controlled to be in a backward flow position,
(4) the operating state of the pressurizing piston is detected based on the position of the detection piston detected by the position sensor.
In order to achieve the above object, a squeeze pin control device according to another aspect of the present invention is characterized in that,
comprising:
a pressurizing cylinder which accommodates a pressurizing piston for advancing and retreating the extrusion pin,
a detection cylinder accommodating a detection piston,
a position sensor that detects a position of the detection piston,
a connection switching valve having an A port, a B port, a P port and a T port, and at least having a parallel connection position where the A port is communicated with the T port and the B port is communicated with the P port, and a series connection position where the A port is communicated with the P port and the B port is cut off from the T port,
the reversing valve is provided with an A port, a B port, a P port and a T port, and at least comprises a backward flowing position where the A port is communicated with the P port and the B port is communicated with the T port and a forward flowing position where the A port is communicated with the T port and the B port is communicated with the P port,
a first flow path connecting the rear oil chamber of the detection cylinder and the B port of the selector valve,
a second flow path connecting the front oil chamber of the detection cylinder to the P port of the connection switching valve,
a third flow path connecting the rear oil chamber of the pressurizing cylinder to the port A of the connection switching valve,
a fourth flow path connecting the front oil chamber of the pressurizing cylinder, the port B connected to the switching valve, and the port A of the selector valve,
a control unit;
the P port of the reversing valve is connected with a pump for supplying working oil,
the T interface of the reversing valve and the T interface of the connecting and switching valve are connected with an oil tank from which working oil is discharged,
the control part
(1) When the pressurizing piston is advanced, the connection switching valve is controlled to be in a series connection position and the direction switching valve is controlled to be in an advanced flow position,
(2) when the pressurizing piston is caused to retreat, the connection switching valve is controlled to be in a series connection position and the direction switching valve is controlled to be in a retreat flow position,
(3) when the pressurizing piston and the detection piston are returned to the original point, the connection switching valve is controlled to be in a parallel connection position and the direction change valve is controlled to be in a backward flow position,
(4) the operating state of the pressurizing piston is detected based on the position of the detection piston detected by the position sensor.
In the present invention, it is preferable that the selector valve includes a flow rate adjustment unit that adjusts a flow rate of the hydraulic oil, and the control unit detects an advancing speed of the pressurizing piston as an operation state of the pressurizing piston and performs feedback control on the flow rate adjustment unit of the selector valve so that the advancing speed approaches a set speed.
In the present invention, it is preferable that the control unit changes the set speed based on a past advance end position of the pressurizing piston.
In the present invention, it is preferable that the control unit determines whether or not the advance speed of the pressurizing piston is within a normal range set for each time or each position, and notifies that an abnormality has occurred when the advance speed of the pressurizing piston is not within the normal range.
In order to achieve the above object, a die casting machine according to another aspect of the present invention includes a mold clamping device that opens and closes a mold, an injection device that injects a melt into a cavity of the mold that is closed by the mold clamping device, and an extrusion pin control device that advances and retracts an extrusion pin with respect to the cavity of the mold, wherein the extrusion pin control device is configured by the extrusion pin control device.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the connection switching valve and the direction switching valve each having 4 ports can switch the pressurizing cylinder and the detection cylinder to be connected in series and parallel, and switch the flow direction of the hydraulic oil to the forward direction (forward direction) and the reverse direction (reverse direction). Therefore, a structure capable of detecting the position of the pressurizing piston can be realized by a simple circuit.
Drawings
Fig. 1 is a sectional view of a main part of a die casting machine according to an embodiment of the present invention.
Fig. 2A and 2B are sectional views illustrating a state in which an extrusion pin is inserted into a cavity of a die in the die casting machine of fig. 1.
Fig. 3 is a circuit diagram (preparatory operation) for explaining the operation of the squeeze pin control device of the die casting machine of fig. 1.
Fig. 4 is a circuit diagram (forward operation) for explaining the operation of the squeeze pin control device of the die casting machine of fig. 1.
Fig. 5 is a circuit diagram (retreating operation) for explaining the operation of the squeeze pin control device of the die casting machine of fig. 1.
Fig. 6 is a circuit diagram (return to origin operation) for explaining the operation of the squeeze pin control device of the die casting machine of fig. 1.
Fig. 7 is a circuit diagram (preparatory operation) for explaining the operation of a modified example of the squeeze pin control device of the die casting machine of fig. 1.
Fig. 8 is a circuit diagram (forward operation) for explaining the operation of a modified example of the squeeze pin control device of the die casting machine of fig. 1.
Fig. 9 is a circuit diagram (retreating operation) illustrating an operation of a modified example of the squeeze pin control device of the die casting machine of fig. 1.
Fig. 10 is a circuit diagram (return to origin operation) for explaining the operation of a modified example of the squeeze pin control device of the die casting machine of fig. 1.
Description of the reference numerals
1 … die casting machine, 10 … mold clamping device, 11 … fixed mold plate, 12 … movable mold plate, 13 … injection chamber, 14 … injection port, 20 … injection device, 21 … plunger head, 22 … injection piston, 30a … extrusion pin control device, 40 … pressing cylinder, 41 … pressing piston, 42 … extrusion pin, front end of 42a … extrusion pin, rear oil chamber of 45 … pressing cylinder, front oil chamber of 46 … pressing cylinder, 50 … detection cylinder, 51 … detection piston, 52 … position sensor, 55 … detection cylinder rear oil chamber, 56 … detection cylinder front oil chamber, 60 … connection switching valve, 70 … reversing valve, 81 … pressure sensor, 82 … pressure reducing valve, 83 … motor, 84 … pump, 85 … oil tank, 3690 control part, K … fixed mold, K … movable mold, C … metal …, M … metal, R … first flow path, R … R, second … flow path … R, … R third flow path …, R4 … fourth flow path, O … origin of the pressurizing piston, L … advance end position of the pressurizing piston.
Detailed Description
A die casting machine according to an embodiment of the present invention will be described below with reference to fig. 1 to 3.
Fig. 1 is a sectional view of a main part of a die casting machine according to an embodiment of the present invention. Fig. 2A and 2B are partial sectional views illustrating a state where the pressing pin is inserted into the cavity of the mold. Fig. 2A shows a state before insertion, and fig. 2B shows a state after insertion. Fig. 3 to 6 are circuit diagrams for explaining the operation (preparation operation, forward movement, backward movement, and return to the original point) of the squeeze pin control device.
The die casting machine 1 of the present embodiment includes a mold clamping device 10, an injection device 20, an extrusion pin control device 30, and a control unit 90.
The mold clamping device 10 includes a fixed platen 11 to which a fixed mold K1 is attached, and a movable platen 12 to which a movable mold K2 is attached. The fixed die plate 11 has a cylindrical shot chamber 13. An injection port 14 is formed in an upper portion of the injection chamber 13, and the metal melt M is injected through a not-shown ladle. The mold clamping device 10 closes and opens the fixed mold K1 and the movable mold K2. The cavity C is formed inside the fixed mold K1 and the movable mold K2.
The injection device 20 includes: an injection piston 22 having a plunger head 21 attached to a tip thereof; the injection cylinder, not shown, advances and retracts the injection piston 22. The plunger head 21 is disposed within the shot chamber 13. The injection device 20 injects and fills the metal melt M inside the shot chamber 13 into the cavity C by advancing the injection piston 22.
The squeeze pin control device 30 includes a pressurizing cylinder 40, a detection cylinder 50, a connection switching valve 60, and a direction switching valve 70.
The pressurizing cylinder 40 is disposed inside the fixed die K1. The pressurizing cylinder 40 accommodates a pressurizing piston 41. A pressing pin 42 is fixed to the pressurizing piston 41. When the pressurizing piston 41 is moved forward and backward by the hydraulic oil supplied to the pressurizing cylinder 40, the pressing pin 42 is also moved forward and backward. The front end 42a of the pressing pin 42 moves between the origin O (letter O) and the advance end position L, and is inserted into or withdrawn from the cavity C.
The detection cylinder 50 accommodates a detection piston 51. The detection cylinder 50 is provided with a position sensor 52, and the position sensor 52 includes a linear encoder or the like for detecting the position of the detection piston 51.
The connection switching valve 60 is an electromagnetic valve that switches the valve body position by an electromagnetic element. The connection switching valve 60 has 4 ports of an a port, a B port, a P port, and a T port. The connection switching valve 60 has, as the valve body position, a parallel connection position where the a port communicates with the T port and the B port communicates with the P port, and a series connection position where the a port communicates with the P port and the B port is disconnected from the T port. The connection switching valve 60 switches the valve body position, and connects the pressurizing cylinder 40 and the detection cylinder 50 in parallel or in series. The connection switching valve 60 may have a neutral position for cutting off all the ports, and preferably has at least a parallel connection position and a series connection position.
The direction valve 70 is an electromagnetic valve that switches the valve body position by an electromagnetic element. The direction valve 70 has 4 ports of a port, B port, P port, and T port. The selector valve 70 has, as valve body positions, a reverse flow position where port a communicates with port P and port B communicates with port T, a forward flow position where port a communicates with port T and port B communicates with port P, and a neutral position where all ports are blocked. The selector valve 70 switches the flow direction of the hydraulic oil to the forward direction (forward movement of the extrusion pin) or the reverse direction (backward movement of the extrusion pin) by switching the valve body position. Preferably, the directional valve 70 has at least a reverse flow position and a forward flow position.
The switching valve 70 has a flow rate adjustment unit that adjusts the flow rate of the hydraulic oil flowing therein in accordance with the input current.
The rear oil chamber 45 of the pressurizing cylinder 40 is connected to the B port of the selector valve 70 via a first flow path R1. The front oil chamber 46 of the pressurizing cylinder 40 is connected to the P port connected to the switching valve 60 via a second flow path R2. The rear oil chamber 55 of the detection cylinder 50 is connected to the port a of the connection switching valve 60 via a third flow path R3. The front oil chamber 56 of the detection cylinder 50, the B port connected to the switching valve 60, and the a port connected to the selector valve 70 are connected to each other by a fourth flow path R4. A pressure sensor 81 for detecting the pressure of the hydraulic oil in the rear oil chamber 45 of the pressurizing cylinder 40 is provided in the first flow path R1.
The P port of the direction valve 70 is connected via a pressure reducing valve 82 to a pump 84 driven by a motor 83. The pressure reducing valve 82 limits the pressure of the working oil flowing to the P-port of the direction valve 70 according to the input current. The T-port of the connection switching valve 60 and the T-port of the selector valve 70 are connected to a tank 85 from which the hydraulic oil is discharged.
The die casting machine 1 includes a control unit 90 that takes charge of the overall operation. The control unit 90 includes a microcomputer for an embedded device, and the microcomputer for an embedded device includes, for example, a CPU, a ROM, a RAM, an EEPROM, and various I/O interfaces. The control section 90 controls various driving sections provided in the respective apparatuses, and executes a mold closing process, a pouring process, an injection process, a pressurizing process (pressure maintaining and cooling process), a mold opening process, a product ejection process, and the like.
In a series of operations for product molding, first, the die casting machine 1 moves the movable die plate 12 to clamp the fixed die K1 and the movable die K2 (die closing step). Next, the metal melt M is injected into the injection chamber 13 of the fixed die plate 11 (pouring step). Then, the injection piston 22 is advanced, and the metal melt M inside the injection chamber 13 is injected and filled into the cavity C through the plunger head 21 (injection process). Further, the metal melt M is pushed by the plunger head 21 and pushed into the cavity C (pressurizing step). Thereafter, the mold is opened (mold opening step), and the product is ejected from the cavity (product ejection step). The die casting machine 1 performs the partial pressurization by the pressing pin in parallel with the pressurization step (partial pressurization step).
In the present embodiment, the control unit 90 is connected to the connection switching valve 60, the selector valve 70, the pressure reducing valve 82, and the motor 83 of the squeeze pin control device 30, and transmits control signals to control these. The control unit 90 is connected to the position sensor 52 and the pressure sensor 81, receives detection signals from these sensors, and detects the position and speed of the detection piston and the pressure of the rear oil chamber 45 of the pressurizing cylinder 40 based on the detection signals.
Next, an example of the partial pressure treatment (partial pressure step) of the present invention in the control section 90 of the die casting machine 1 according to the present embodiment will be described with reference to table 1 and fig. 3 to 6. In each figure, a thick arrow in gray schematically shows the flow direction of the working oil. In the initial state of the partial pressure treatment, the tip 42a of the pressing pin 42 is located at the origin O.
(1) As shown in fig. 3, before the injection process is completed, the control unit 90 sets the valve body position of the connection switching valve 60 to the parallel connection position and sets the valve body position of the selector valve 70 to the neutral position as a preparatory operation. Then, the control unit 90 sets the upper limit pressure of the hydraulic oil flowing to the P port of the selector valve 70 to the pressure reducing valve 82. The controller 90 starts the operation of the motor 83 for the hydraulic oil to drive the pump 84. As a result, the hydraulic oil flows from the tank 85 to the P port of the selector valve 70 through the pressure reducing valve 82, but the flow is restricted by the circuit being cut off at the front.
(2) As shown in fig. 4, when the injection step is completed and the pressurization step is started, the control unit 90 sets the valve body position of the connection switching valve 60 to the series connection position and sets the valve body position of the selector valve 70 to the forward flow position as the forward operation.
Accordingly, the hydraulic oil flows into the rear oil chamber 45 of the pressurizing cylinder 40 through the P port and the B port of the selector valve 70 and the first flow path R1, and moves the pressurizing piston 41 forward (in the left direction in the figure). By the forward movement of the pressurizing piston 41, the hydraulic oil in the front oil chamber 46 of the pressurizing cylinder 40 flows into the rear oil chamber 55 of the detection cylinder 50 through the second flow path R2, the P port and the a port connecting the switching valve 60, and the third flow path R3, and the detection piston 51 is moved forward. The hydraulic oil in the front oil chamber 56 of the detection cylinder 50 is finally discharged to the oil tank 85 through the fourth flow path R4, the port a and the port T of the selector valve 70 by the forward movement of the detection piston 51. The pressurizing piston 41 is moved from the origin O to the advance end position L by the flow of the hydraulic oil, and this state is maintained for a predetermined time.
At this time, the control section 90 detects the forward speed, which is the operating state of the pressurizing piston 41, based on the detection signal of the position sensor 52, and performs feedback control (PID control) on the flow rate adjustment section of the selector valve 70 so that the forward speed approaches the set speed, thereby adjusting the flow rate of the hydraulic oil flowing through the selector valve 70. In the present embodiment, the set speed is set for each position of the pressurizing piston 41. Alternatively, the set speed may be set for each time from the forward movement start time point of the pressurizing piston 41. The control unit 90 determines whether or not the forward speed of the pressurizing piston 41 is within a normal range at each position or at each time, with a range of ± 10% around the set speed as a normal range, and notifies the occurrence of an abnormal situation by an alarm such as a buzzer if the forward speed is not within the normal range. The controller 90 may notify that an abnormality has occurred when it is detected a plurality of times that the forward speed of the pressurizing piston 41 is not within the normal range.
The control unit 90 may detect the pressure of the rear oil chamber of the pressurizing cylinder 40 based on the detection signal of the pressure sensor 81, and perform feedback control of the flow rate adjustment unit of the selector valve 70 so that the pressure approaches the set pressure, as in the case of the forward speed, to adjust the flow rate of the hydraulic oil flowing through the selector valve 70. As with the set speed, the set pressure may be set for each position of the pressurizing piston 41 or each time from the forward movement start time point of the pressurizing piston 41. The control unit 90 may determine whether or not the pressure of the rear oil chamber 45 of the pressurizing piston 41 is within a normal range at each position or at each time, with a range of ± 10% with the set pressure as a center as a normal range, and notify the occurrence of an abnormal situation by an alarm or the like such as a buzzer when the pressure is not within the normal range.
(3) As shown in fig. 5, when the forward movement operation is completed, the control unit 90 sets the valve body position of the connection switching valve 60 to the series connection position and sets the valve body position of the selector valve 70 to the reverse flow position as the reverse movement operation.
Accordingly, the hydraulic oil flows into the front oil chamber 56 of the detection cylinder 50 through the P port and the a port of the selector valve 70 and the fourth flow path R4, and the detection piston 51 is moved backward (in the right direction in the figure). By the retraction of the detection piston 51, the hydraulic oil in the rear oil chamber 55 of the detection cylinder 50 flows into the front oil chamber 46 of the pressurizing cylinder 40 through the third flow path R3, the a port and the P port connecting the switching valve 60, and the second flow path R2, and the pressurizing piston 41 is retracted. The hydraulic oil in the rear oil chamber 45 of the pressurizing cylinder 40 is finally discharged to the oil tank 85 through the first flow path R1, the B port and the T port of the selector valve 70 by the retraction of the pressurizing piston 41. The pressurizing piston 41 is moved from the advance end position L toward the origin O by the flow of the hydraulic oil. At this time, the pressurizing piston 41 may not be able to return to the origin O accurately due to a difference in the structure of the pressurizing cylinder 40 and the detection cylinder 50, leakage of the hydraulic oil, or the like, and may stop at a position near the origin O'.
The control unit 90 detects the position of the pressurizing piston 41 based on the detection signal of the position sensor 52, and determines whether or not the pressurizing piston 41 moves backward. The control unit 90 notifies that an abnormality has occurred when it determines that the pressurizing piston 41 is not retreating.
(4) As shown in fig. 6, when the reverse operation is completed, the control unit 90 causes the valve body position of the connection switching valve 60 to be the parallel connection position and causes the valve body position of the selector valve 70 to be the reverse flow position as the return-to-origin operation.
Accordingly, the hydraulic oil flows into the front oil chamber 46 of the pressurizing cylinder 40 and the front oil chamber 56 of the detection cylinder 50 through the P port and the a port of the selector valve 70 and the fourth flow path R4, and the pressurizing piston 41 and the detection piston 51 are retracted. Further, the hydraulic oil in the rear oil chamber 45 of the pressurizing cylinder 40 is finally discharged to the oil tank 85 through the first flow path R1, the B port and the T port of the selector valve 70 by the retraction of the pressurizing piston 41. Further, by the retraction of the detection piston 51, the hydraulic oil in the rear oil chamber 55 of the detection cylinder 50 is finally discharged to the oil tank 85 through the third flow path R3 and the a port and the T port connecting the switching valve 60. The pressurizing piston 41 and the detection piston 51 are moved backward by the flow of the hydraulic oil until they collide with a stopper, not shown, and the position of the pressurizing piston 41 is returned to the origin O. Likewise, the position of the detection piston 51 is also returned to the origin.
Table 1 shows the relationship between each action in the partial pressurization process and the valve body position of the connection switching valve 60 and the selector valve 70.
[ Table 1]
| (1) Preparatory actions | (2) Forward motion | (3) Backward motion | (4) Return to origin action | |
| Connection switching valve | Parallel connection position | Position of series connection | Position of series connection | Parallel connection position |
| Reversing valve | Forward flow position | Forward flow position | Backward flow position | Backward flow position |
As described above, according to the die casting machine 1 of the present embodiment, the squeeze pin control device 30 can switch the pressurizing cylinder 40 and the detection cylinder 50 between the series connection and the parallel connection by connecting the switching valve 60 and the changeover valve 70, and can switch the flow direction of the hydraulic oil between the forward direction (forward movement) and the reverse direction (reverse movement). Therefore, a configuration capable of detecting the position of the pressurizing piston 41 can be realized by a simple circuit having only two switching valves.
The selector valve 70 has a flow rate adjustment unit that adjusts the flow rate of the hydraulic oil, and the control unit 90 detects the forward speed of the pressurizing piston 41 and feedback-controls the flow rate adjustment unit of the selector valve 70 so that the forward speed approaches the set speed. Therefore, the advancing speed can be made closer to the set speed more effectively, and the extrusion pin can be controlled with high accuracy.
The control unit 90 determines whether or not the forward speed of the pressurizing piston 41 is within a normal range set for each time or each position, and notifies that an abnormality has occurred when the forward speed is not within the normal range. Therefore, it is possible to detect an operation abnormality of the apparatus and a product quality problem caused by the operation abnormality at an early stage.
The die casting machine 1 of the above embodiment has a squeeze pin control device 30, and when the pressurizing cylinder 40 and the detection cylinder 50 are connected in series, the squeeze pin control device 30 connects the front oil chamber 46 of the pressurizing cylinder 40 and the rear oil chamber 55 of the detection cylinder 50. However, the present invention is not limited to this configuration. For example, the squeeze pin control device 30A may be configured to connect the front oil chamber 56 of the detection cylinder 50 and the rear oil chamber 45 of the pressurization cylinder 40 when the pressurization cylinder 40 and the detection cylinder 50 are connected in series, as shown in fig. 7 to 10. The extrusion pin control device 30A has the same configuration as the extrusion pin control device 30 except that the pressurizing cylinder 40 and the detection cylinder 50 are exchanged and the pressure sensor 81 is provided in the third flow path R3. The extrusion pin control device 30A performs the above-described operations (1) to (4) in the local pressurization process, similarly to the extrusion pin control device 30, and therefore, detailed description thereof is omitted. The die casting machine having the squeeze pin control device 30A also achieves the same effects as those of the die casting machine 1 of the above embodiment.
In the die casting machine 1 according to the above embodiment, the control unit 90 may change the set speed of the pressurizing piston 41 in accordance with the past advance end position L of the pressurizing piston 41. The advance end position L of the pressurizing piston 41 varies depending on various conditions (season, time zone, time from the start of the apparatus, variation in the pump discharge amount or valve flow rate due to aging, clogging of a hydraulic oil filter, and the like). Therefore, for example, the control unit 90 stores the previous first to several times of the advance end position L, and detects the tendency of the change (whether the advance end position L is a tendency to approach the origin O or a tendency to move away from the origin O). The next advance end position L is predicted from the fluctuation tendency, and the set speed or the set pressure is adjusted so that the pressurizing piston 41 stops at the advance end position L. For example, the set speed set for each position of the pressurizing piston 41 is increased or decreased as a whole, the set speed between the partial regions is increased or decreased, or the ratio of the acceleration region and the constant speed region is changed. Thus, the deviation of the advance end position L can be suppressed. The movement ending position L may be stored for a long period of time, the tendency of the movement may be learned, and the set speed or the set pressure may be adjusted based on the learning result.
Further, the die casting machine 1 of the above embodiment performs the preliminary molding operation (trial molding operation) for stabilizing the operation a plurality of times immediately after the start of the equipment. In this preliminary forming operation, the control unit 90 may gradually change the advance end position L of the pressing pin 42 according to the length of the machine stop time before the machine starts, thereby gradually increasing the pressing effect of the pressing pin 42. Specifically, the longer the apparatus stop time is, the smaller the amount of change in the forward end position L is made, and the shorter the apparatus stop time is, the larger the amount of change in the forward end position L is made. Thus, the operation can be effectively stabilized, and the occurrence of a product having a quality problem can be suppressed.
The embodiments of the present invention have been described above, but the present invention is not limited to these examples. A person skilled in the art can appropriately add or delete components to or from the above-described embodiments and modify the design of the embodiments, or can appropriately combine technical features of the embodiments, and the embodiments are included in the scope of the present invention as long as they meet the spirit of the present invention.
Claims (6)
1. An extrusion pin control device is characterized in that,
comprising:
a pressurizing cylinder which accommodates a pressurizing piston for advancing and retreating the extrusion pin,
a detection cylinder accommodating a detection piston,
a position sensor that detects a position of the detection piston,
a connection switching valve having an A port, a B port, a P port and a T port, and at least having a parallel connection position where the A port is communicated with the T port and the B port is communicated with the P port, and a series connection position where the A port is communicated with the P port and the B port is cut off from the T port,
the reversing valve is provided with an A port, a B port, a P port and a T port, and at least comprises a backward flowing position where the A port is communicated with the P port and the B port is communicated with the T port and a forward flowing position where the A port is communicated with the T port and the B port is communicated with the P port,
a first flow path connecting the rear oil chamber of the pressurizing cylinder and the B port of the selector valve,
a second flow path connecting the front oil chamber of the pressurizing cylinder to the P port of the connection switching valve,
a third flow path for connecting the rear oil chamber of the detection cylinder to the port A of the connection switching valve,
a fourth flow path connecting the front oil chamber of the detection cylinder, the port B of the connection switching valve, and the port A of the selector valve,
a control unit;
the P port of the reversing valve is connected with a pump for supplying working oil,
the T interface of the reversing valve and the T interface of the connecting and switching valve are connected with an oil tank which is discharged with working oil,
the control part
(1) When the pressurizing piston is advanced, the connection switching valve is controlled to be in a series connection position and the direction switching valve is controlled to be in an advanced flow position,
(2) when the pressurizing piston is caused to retreat, the connection switching valve is controlled to be in a series connection position and the direction switching valve is controlled to be in a retreat flow position,
(3) when the pressurizing piston and the detection piston are returned to the original point, the connection switching valve is controlled to be in a parallel connection position and the direction change valve is controlled to be in a backward flow position,
(4) the operating state of the pressurizing piston is detected based on the position of the detection piston detected by the position sensor.
2. An extrusion pin control device is characterized in that,
comprising:
a pressurizing cylinder which accommodates a pressurizing piston for advancing and retreating the extrusion pin,
a detection cylinder accommodating a detection piston,
a position sensor that detects a position of the detection piston,
a connection switching valve having an A port, a B port, a P port and a T port, and at least having a parallel connection position where the A port is communicated with the T port and the B port is communicated with the P port, and a series connection position where the A port is communicated with the P port and the B port is cut off from the T port,
the reversing valve is provided with an A port, a B port, a P port and a T port, and at least comprises a backward flowing position where the A port is communicated with the P port and the B port is communicated with the T port and a forward flowing position where the A port is communicated with the T port and the B port is communicated with the P port,
a first flow path connecting the rear oil chamber of the detection cylinder and the B port of the selector valve,
a second flow path connecting the front oil chamber of the detection cylinder to the P port of the connection switching valve,
a third flow path connecting the rear oil chamber of the pressurizing cylinder to the port A of the connection switching valve,
a fourth flow path connecting the front oil chamber of the pressurizing cylinder, the port B connected to the switching valve, and the port A of the selector valve,
a control unit;
the P port of the reversing valve is connected with a pump for supplying working oil,
the T interface of the reversing valve and the T interface of the connecting and switching valve are connected with an oil tank from which working oil is discharged,
the control part
(1) When the pressurizing piston is advanced, the connection switching valve is controlled to be in a series connection position and the direction switching valve is controlled to be in an advanced flow position,
(2) when the pressurizing piston is caused to retreat, the connection switching valve is controlled to be in a series connection position and the direction switching valve is controlled to be in a retreat flow position,
(3) when the pressurizing piston and the detection piston are returned to the original point, the connection switching valve is controlled to be in a parallel connection position and the direction change valve is controlled to be in a backward flow position,
(4) the operating state of the pressurizing piston is detected based on the position of the detection piston detected by the position sensor.
3. The squeeze pin control device according to claim 1 or 2,
the change valve has a flow rate adjusting section for adjusting the flow rate of the working oil,
the control unit detects a forward speed of the pressurizing piston as an operating state of the pressurizing piston, and performs feedback control on the flow rate adjustment unit of the selector valve so that the forward speed approaches a set speed.
4. The squeeze pin control device of claim 3,
the control unit changes the set speed based on a past advance end position of the pressurizing piston.
5. The squeeze pin control device of claim 3,
the control unit determines whether or not the forward speed of the pressurizing piston is within a normal range set for each time or each position, and notifies that an abnormality has occurred when the forward speed is not within the normal range.
6. A die casting machine having a mold clamping device for opening and closing a mold, an injection device for injecting a melt into a cavity of the mold closed by the mold clamping device, and an extrusion pin control device for advancing and retreating an extrusion pin with respect to the cavity of the mold,
the extrusion pin control apparatus is constituted by the extrusion pin control apparatus according to any one of claims 1 to 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017225886A JP6909714B2 (en) | 2017-11-24 | 2017-11-24 | Squeeze pin controller and die casting machine with it |
| JP2017-225886 | 2017-11-24 |
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| Publication Number | Publication Date |
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| CN109909476A CN109909476A (en) | 2019-06-21 |
| CN109909476B true CN109909476B (en) | 2021-07-06 |
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| CN201811409102.3A Active CN109909476B (en) | 2017-11-24 | 2018-11-23 | Extrusion pin control device and die casting machine having the same |
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| CN (1) | CN109909476B (en) |
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| CN110548854B (en) * | 2019-10-23 | 2021-12-10 | 广东宝洋科技有限公司 | Forging control method for metal product |
| CN111151723A (en) * | 2020-01-06 | 2020-05-15 | 肇庆谊龙科技有限公司 | Local pressurization system |
| CN112872322A (en) * | 2021-02-23 | 2021-06-01 | 广州和德轻量化成型技术有限公司 | Local extrusion device of indirect extrusion casting die and preparation method thereof |
| CN114101623A (en) * | 2021-11-26 | 2022-03-01 | 广东鸿图科技股份有限公司 | Local pressurizing device for die casting |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5161598A (en) * | 1990-09-05 | 1992-11-10 | Toshiba Kikai Kabushiki Kaisha | Method of controlling mold pressure pin for press casting machine |
| JPH05337623A (en) * | 1992-06-10 | 1993-12-21 | Toyota Motor Corp | Casting apparatus |
| JPH06142884A (en) * | 1992-10-28 | 1994-05-24 | Toshiba Mach Co Ltd | Injection device of die casting machine |
| JPH06226417A (en) * | 1993-02-05 | 1994-08-16 | Toyota Motor Corp | Method for controlling pressurizing pin |
| JPH0767610B2 (en) * | 1989-02-28 | 1995-07-26 | 宇部興産株式会社 | Injection molding method |
| CN101134235A (en) * | 2006-08-31 | 2008-03-05 | 三菱重工业株式会社 | Method and apparatus for manufacturing aluminum die-cast product |
| JP4443794B2 (en) * | 2001-06-26 | 2010-03-31 | 豊興工業株式会社 | Pressure pin control device |
| CN105179342A (en) * | 2015-08-13 | 2015-12-23 | 湖南三一石油科技有限公司 | Oil cylinder synchronous hydraulic system, work machine and oil cylinder drive method |
| CN107073567A (en) * | 2014-11-04 | 2017-08-18 | 东洋机械金属株式会社 | Supervising device in the mould of die casting machine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0549158U (en) * | 1991-12-11 | 1993-06-29 | 株式会社日立製作所 | Local pressure device for die casting machine |
| JPH05208254A (en) * | 1992-01-30 | 1993-08-20 | Nippondenso Co Ltd | Casting device for die casting |
| JP3640704B2 (en) * | 1994-08-18 | 2005-04-20 | トヨタ自動車株式会社 | Pressure casting method |
| JPH08309503A (en) * | 1995-05-18 | 1996-11-26 | Toyota Motor Corp | Press casting method |
| JP2000005857A (en) * | 1998-06-22 | 2000-01-11 | Toyota Autom Loom Works Ltd | Press casting machine |
| JP4520007B2 (en) * | 2000-09-26 | 2010-08-04 | 豊興工業株式会社 | Pressure pin control device |
| JP4883557B2 (en) * | 2006-02-21 | 2012-02-22 | 東芝機械株式会社 | Method for detecting abnormality of squeeze pin and molding machine |
-
2017
- 2017-11-24 JP JP2017225886A patent/JP6909714B2/en active Active
-
2018
- 2018-11-23 CN CN201811409102.3A patent/CN109909476B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0767610B2 (en) * | 1989-02-28 | 1995-07-26 | 宇部興産株式会社 | Injection molding method |
| US5161598A (en) * | 1990-09-05 | 1992-11-10 | Toshiba Kikai Kabushiki Kaisha | Method of controlling mold pressure pin for press casting machine |
| JPH05337623A (en) * | 1992-06-10 | 1993-12-21 | Toyota Motor Corp | Casting apparatus |
| JPH06142884A (en) * | 1992-10-28 | 1994-05-24 | Toshiba Mach Co Ltd | Injection device of die casting machine |
| JPH06226417A (en) * | 1993-02-05 | 1994-08-16 | Toyota Motor Corp | Method for controlling pressurizing pin |
| JP4443794B2 (en) * | 2001-06-26 | 2010-03-31 | 豊興工業株式会社 | Pressure pin control device |
| CN101134235A (en) * | 2006-08-31 | 2008-03-05 | 三菱重工业株式会社 | Method and apparatus for manufacturing aluminum die-cast product |
| CN107073567A (en) * | 2014-11-04 | 2017-08-18 | 东洋机械金属株式会社 | Supervising device in the mould of die casting machine |
| CN105179342A (en) * | 2015-08-13 | 2015-12-23 | 湖南三一石油科技有限公司 | Oil cylinder synchronous hydraulic system, work machine and oil cylinder drive method |
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|---|---|
| JP6909714B2 (en) | 2021-07-28 |
| JP2019093427A (en) | 2019-06-20 |
| CN109909476A (en) | 2019-06-21 |
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