JP2001277256A - Sprayer for mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the operation of a cylinder means from being prevented by the precipitation of a spraying agent in a cylindrical sprayer for a mold. SOLUTION: A storage chamber for storing a mold releasing agent is installed in a passage between a mold releasing agent tank and a spray nozzle, and the cylinder means which communicates with the storage chamber and stores the agent temporarily is installed adjacently to the side of the storage chamber. A motor-operated actuator which reciprocates the piston of the cylinder means speed-changeably is installed, and a controller which changes/controls the driving speed of the actuator while detecting the position of the piston by a sensor attached to the actuator is provided. By the controller, the agent is sucked temporarily into the chamber and the cylinder means in the passage, and the extrusion speed of the cylinder means is changed/controlled while the spray nozzle is moved in a spray route in relation to a mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold spraying apparatus, and more particularly to a mold spraying apparatus for spraying a spray agent such as a mold release agent or a heat insulating agent onto a mold surface of a die casting machine or each part of a sleeve. Things.

[0002]

2. Description of the Related Art Generally, a die such as a die casting machine is
In actuality, the temperature is hardly uniform throughout the molding, and the temperature of each part is different. For this reason, it is necessary to increase the spray amount in the portion where the mold temperature is high, and to reduce the spray amount in the portion where the mold temperature is low, and adjust the spray amount to each portion. Various mold spray devices having functions have been used. For example,
A constant pressure type mold spraying device that adjusts the spraying rate to each part by adjusting the moving speed of the spray nozzle while keeping the spraying pressure constant, a valve provided with a flow rate adjustment valve in the spraying agent supply path After inhaling the spray into the mold spray device of the opening adjustment type or the cylinder means, this spray is discharged while controlling the moving speed of the piston of the cylinder means, and the spray amount from the spray nozzle is controlled. A cylinder type mold spraying device or the like for adjustment has been used.

In the above-described mold spraying apparatus of the constant pressurization type, the spraying cycle per unit area must be lengthened by lowering the moving speed of the spray nozzle in the cavity where the mold temperature is high, so that the spray cycle is long. Become. Alternatively, in order to shorten the spray cycle, the pressure can be increased to increase the amount of spray per unit time. However, in this case, there is a drawback that the spray is excessively sprayed in the cavity portion where the mold temperature is low. In addition, the mold spray device of the valve opening adjustment type described above has a drawback in that it is difficult to finely adjust the spray amount of the spray agent and that the throttle portion of the flow control valve is blocked by a solid component of the spray agent.

[0004]

The above-mentioned cylinder type mold spraying apparatus has an advantage that the adjustment range of the spraying agent spray amount is wide and the control accuracy is excellent, but on the other hand,
The cylinder inner wall portion where the piston cannot reach when the spray agent in the cylinder means is left for a long time, or when the spray agent is supplied / discharged (the lower end lower corner portion on the right side of the piston advance limit of the cylinder 25 in FIG. 6) ), A solid component having a higher specific gravity than water is deposited in the cylinder means due to sedimentation and separation of the spray agent. When such a state is repeated for a long period of time, the deposited sediment 18
There is a problem that a gradually increases at the lower corner of the tip of the right cylinder 25 when viewed from the front in FIG. 6 and becomes firmly fixed to the inner wall of the cylinder 25 over time. Further, the sediment sediment 18a
As the pressure gradually increases, the supply / discharge port is closed and the required amount of spray cannot be supplied, or the solid component of the spray is caught between the cylinder 25 and the piston 26, causing the piston 26 to slide. Or become impossible. For this reason, a serious situation that the piston rod 28 is bent or the actuator is damaged may be caused.

The present invention has been made in view of the above-mentioned conventional problems, and provides a cylinder type mold spraying apparatus in which the operation of the cylinder means is not hindered by the sediment of the spray agent. Is what you do.

[0006]

In order to achieve the above object, according to a first aspect of the present invention, there is provided a storage chamber for storing a spray agent interposed in a flow path between a spray agent tank and a spray nozzle, Cylinder means, which communicates with the inside of the storage chamber and temporarily stores the spray agent, is connected in the direction in which the piston side chamber contacts the side surface of the storage chamber, and reciprocates the piston of the cylinder means at a variable moving speed. An electric actuator is provided, and a controller is provided for changing the drive speed of the electric actuator while detecting the position of the piston by a sensor attached to the electric actuator.

[0007] In the second aspect of the invention, which is mainly based on the first aspect, the bottom of the storage chamber is formed in a cone shape, and the sediment formed by sedimentation and separation of the solid component of the spray agent in the storage chamber is removed. A discharge valve for discharging is provided at a lower portion of the storage chamber. Further, the third invention mainly based on the first invention
In the invention, a stirrer for stirring the spray is provided in the storage chamber in order to prevent the solid component of the spray from separating and settling in the storage chamber.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of a mold spray apparatus according to the present invention will be described in detail with reference to the drawings. 1 to 5 relate to an embodiment of the present invention, and FIG.
FIG. 2 is an overall configuration diagram of a mold spray device according to the embodiment of FIG.
FIG. 3 is an explanatory view and a side view of a moving path of a spray nozzle, FIG. 3 is a flowchart showing a relationship between a process by a controller and a process by a mold spray robot, and FIG. FIG. 5 is a configuration diagram of a storage chamber of the mold spray device according to the third embodiment.

As shown in FIG. 1, a mold spray apparatus according to a first embodiment is applied to spray a spray agent to a mold cavity. The spray nozzle 14 for spraying is attached to the lower end of the arm 16, and the arm 16 driven by a robot (not shown) is arranged between the movable mold 10 </ b> A and the fixed mold 10 </ b> B in an open state, and spraying is performed. The angle of the arm 16 can be adjusted appropriately so that the nozzle 14 can be moved in the vertical and horizontal directions and the front-back direction with the nozzle 14 facing the mold cavity, and the spray nozzle 14 has a desired angle with respect to the mold cavity. It is possible. For example, as shown in FIG. 2, the spray nozzle 14 follows the descending line from the upper right end position with respect to the mold cavity 12, moves laterally, descends again via the ascending line, and crosses the sleeve. A moving path is set, and drive control is performed according to the set path.

The spray nozzle 14 has a spray agent 1
8 is supplied, a spray tank 20 as a supply source is provided, and a storage chamber 30 for storing the spray 18 is provided in the middle of a flow path 22 from the spray tank 20 to the spray nozzle 14. Have been.
Further, a cylinder means 24 is continuously provided on a side surface of the storage chamber 30, and a piston-side sub-chamber of the cylinder means 24 is configured so that the inside of the storage chamber 30 and the entire end portion communicate with each other. The cylinder means 24 accommodates a piston 26 inside the cylinder 25, and sucks and stores the spray agent 18 from the spray agent tank 20 via the storage chamber 30 by sucking and moving the piston rod 28, and stores the spray agent 18 by pressing and moving. Spray agent 18 sprayed into spray nozzle 14
To supply.

A solenoid valve 32 as a direction switching valve is interposed in the middle of the flow path 22 leading to the supply / discharge port 30a provided above the storage chamber 30. By switching this, when the cylinder means 24 performs the suction operation, the storage chamber 30 is communicated with the spray agent tank 20,
At the time of the pressing operation, the flow path is switched so as to communicate with the spray nozzle 14.

Further, an electric actuator 38 for reciprocating the piston rod 28 of the cylinder means 24 is provided. The electric actuator 38 includes
A ball screw 36 rotationally driven by a motor 34 is disposed in parallel with the piston rod 28, and a joint member 42 attached to a slider 40 that is linearly moved by being screwed to the ball screw 36 is a floating joint 44.
Through the piston rod 28. With this configuration, the linear movement speed of the piston rod 28 can be variably adjusted by changing the rotation speed of the motor 34, and the forward / backward movement direction of the piston rod 28 can be switched by changing the rotation direction of the motor 34. It is.

In the embodiment shown in FIG.
8, the spray agent 18 is once sucked into the piston side compartment of the cylinder means 24, and after the suction is completed, the piston rod 28 is moved forward to discharge and supply the spray agent 18 to the spray nozzle 14 side. I have. The spray nozzle 14 is connected to an air pipe 48 communicating with the air tank 46 together with the flow path 22 of the spray agent 18, and a solenoid valve 50 for opening and closing the air flow path is interposed in the middle of the air pipe 48. ing.

The switching control of the solenoid valves 32 and 50 is performed by an operation command signal from a controller 52, and the solenoid valve 32 for the spray is switched to the discharge side at the same time as the solenoid valve 50 for the air.
Is also switched to the open side, and the spray agent 18 in a gas-liquid mixed state is sprayed from the spray nozzle 14.
As will be described in detail later, the relationship between the movement route of the spray nozzle 14 (see FIG. 2) and the required spray agent flow rate required according to the mold temperature distribution on this movement route is preset and stored in the controller 52. Have been. The relationship between the movement route of the spray nozzle 14 and the position of the piston 26 of the cylinder means 24 is also set in advance,
It is stored in the controller 52. The controller 52 recognizes the position of the slider 40 of the cylinder means 24, and thus the position of the piston 26, based on the position signal from the encoder 54 provided in the motor 34.
Controls the rotation speed of the motor 34 of the electric actuator 38 so that the stored spray agent flow rate is obtained.

Further, the controller 52 monitors the driving range of the electric actuator 38. That is, based on the position signal from the encoder 54, it is detected that the piston 26 has reached the limit position for forward movement, thereby restricting the forward movement of the piston 26, and detecting that the piston 26 has reached the limit position for backward movement. As a result, the backward movement of the piston 26 is restricted.

The process of setting the flow rate of the spray agent in the controller 52 may be performed as follows. Based on the mold shape and the expected temperature distribution, for example, the moving route of the spray nozzle 14 as shown in FIG. 2A is set so as to shorten the cycle time. Further, the flow rate of the spray agent for each movement route is set based on the expected mold temperature. In the case of FIG. 2A, it is determined that the mold temperature in the gate portion (near the moving route) is high, and the flow rate of the spray agent is set to be large in the vicinity (moving route). The flow rate of each of the other paths that are determined to have a lower mold temperature is set based on the expected mold temperature. After spraying under this setting condition, further products,
While continuing to finely adjust the flow rate by the judgment of the operator based on the state of the mold, the mold temperature, and the like, the optimum flow rate is finally determined as shown in Table 1 for example.

[0017]

[Table 1]

The flow rate control of the spray agent by the controller 52 in which the data corresponding to Table 1 is set and stored is performed in cooperation with the operation of the mold spray robot that moves the spray nozzle 14 as described below.

As shown in FIG. 3, in the processing step of the mold spray robot, a synchronization signal corresponding to each setting (step 100) of each movement route (i = 1 to N) of the spray nozzle 14 is output. (Step 110), the mold spray robot is operated (Step 12)
0), while updating the movement route (step 13)
0), this is repeated until the final movement route is reached, thereby completing one cycle. On the other hand, in the processing process of the controller 52, each movement route of the spray nozzle 14 (i = 1 to
A fixed flow route for the discharge flow rate corresponding to N) is set (step 200), and a process of monitoring a synchronization signal from the mold spray robot is performed (step 210).
The spray flow rate is read from the memory for each route corresponding to the synchronization signal (step 220), and while detecting the position signal from the encoder 54, the electric actuator 38 is driven such that the flow rate is set for each route. The spray processing is performed (step 230), and the flow rate is changed and controlled so as to become the next set flow rate every time the route is updated by the synchronization signal (step 240).

The spraying method using the thus-configured mold spraying apparatus is performed as follows. The suction operation is performed in a state where the solenoid valves 32 and 50 are turned off (closed), and the storage chamber 30 is connected to the spray agent tank 20, and the motor 34 of the electric actuator 38 is monitored while monitoring the position signal from the encoder 54. The piston 26 is retracted until the cylinder means 24 reaches the retreat limit and stopped. As a result, the spray 18 is sucked from the spray tank 20 into the piston-side compartment of the cylinder means 24 via the storage chamber 30.

After the suction operation is completed, the discharge operation is started.
A forward command signal is output from the controller 52 to the electric actuator 38 based on a synchronization signal from the robot controller 6 or the robot controller 58, and the piston 26 starts to move forward.
At this time, the solenoid valves 32 and 50 are ON (open).
A signal is output, and the storage chamber 30 and the spray nozzle 1
4 is in communication, and at the same time, air is also supplied to the spray nozzle 14. The advance command signal to the electric actuator 38 causes the piston 26 to advance at an operation speed corresponding to a preset flow rate. Further, the forward command signal is sequentially changed to the operation speed corresponding to the next set flow rate upon receiving a synchronization signal output from the robot control device 58 every time the route in the movement path of the spray nozzle 14 is updated. When the set flow rate is “0”, the forward command signal is set to “0” (forward stop), and the solenoid valves 32 and 50 are also turned off (closed), so that the spray agent 18 leaks from the spray nozzle 14. It is designed to prevent that.

When the mold spraying device is stopped, the solenoid valves 32 and 50 are similarly turned off (closed).
In this state, the spray agent 18 is prevented from leaking from the spray nozzle 14, and the piston 26 is stopped with the piston 26 held at the forward limit. That is, at the time of stop, the spray agent 18 is not stored in the cylinder means 24.

According to the first embodiment, the flow rate of the spray agent 18 sprayed from the spray nozzle 14 can be arbitrarily controlled, and a short-time and optimal spray operation can be performed. Also, even if the mold spray device is used for a long time,
The solid component of the spray agent 18 is deposited only on the bottom of the storage chamber 30 and does not deposit in the cylinder means 24.
The operation of the cylinder means 24 is not hindered by the sediment.

FIG. 4 shows the configuration of the storage chamber of the mold spray device according to the second embodiment. In the mold spraying apparatus according to the second embodiment, the bottom of the storage chamber 30 is formed in a cone shape to eliminate the dead space of the flow, and a discharge port 30b is formed in the center of the storage chamber 30.
It is characterized in that a discharge valve 30c that allows the spray agent 18 to be freely discharged and closed from 0b is provided. The other configuration is the same as that of the first embodiment, and the spraying method and the control content are also the same, so the description will be omitted.

According to the second embodiment, the sediment deposited in the storage chamber 30 generated during long-term use of the mold spraying apparatus and the storage chamber formed by separation and sedimentation while the mold spraying apparatus is stopped. The sediment in the outlet 30b is discharged together with the spray while the sediment is still fluid.
Can be extracted from Accordingly, it is possible to prevent the deposit of the spray agent from continuously accumulating in the storage chamber 30 and becoming firmly fixed. The time during which the sediment solidifies and adheres depends on the type of spray agent.Therefore, grasp in advance the period during which the sediment has sufficient fluidity for each spray agent, and the operator periodically It is desirable to open the discharge valve 30c and discharge the sediment together with the spray agent 18.

FIG. 5 shows the configuration of the storage chamber of the mold spray device according to the third embodiment. The mold spray device according to the third embodiment is characterized in that a stirrer 31 for stirring the spray agent 18 stored in the storage chamber 30 is provided. The other configuration is the same as that of the first embodiment, and the spraying method and the control content are also the same, so the description will be omitted. According to the third embodiment, the spray agent 1 stored in the storage chamber 30 by the stirrer 31 is used.
8 can be stirred to prevent the solid components from separating and precipitating.

[0027]

As described above, the present invention exerts the following excellent effects. (1) A storage chamber is provided for storing the spray agent interposed in the flow path between the spray agent tank and the spray nozzle. An electric actuator is provided which is continuously provided in a direction in contact with the side surface of the storage chamber, and which reciprocally drives a piston of the cylinder means at a variable moving speed,
By providing a controller that changes and controls the driving speed of the electric actuator while detecting the position of the piston with a sensor attached to the electric actuator, it is possible to arbitrarily control the flow rate of the spray agent sprayed from the spray nozzle. It is possible to carry out an optimal spraying operation in a short time. Further, even if the mold spraying device is used for a long period of time, since the deposited sediment of the spray is only generated at the bottom of the storage chamber, the solid component of the spray is caught between the cylinder and the piston. The operation of the cylinder means is not impeded by the sediment. (2) The discharge valve is provided at the lower part of the storage chamber, and the sediment of the spray is deposited by discharging the sediment generated in the storage chamber from the discharge port together with the spray while the sediment still has fluidity. Subsequently, it is possible to prevent the state of being firmly fixed. (3) By disposing the stirrer for stirring the spray in the storage chamber, it is possible to prevent the solid component of the spray from settling and separating in the storage chamber.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a mold spray device according to a first embodiment.

FIG. 2 is an explanatory view and a side view of a movement path of a spray nozzle of the apparatus.

FIG. 3 is a flowchart showing a relationship between processing by a controller of the apparatus and processing by a mold spray robot.

FIG. 4 is a configuration diagram of a storage chamber of a mold spray device according to a second embodiment.

FIG. 5 is a configuration diagram of a storage chamber of a mold spray device according to a third embodiment.

FIG. 6 is a configuration diagram of a cylinder means of a conventional mold spray device.

[Explanation of symbols]

 10A, 10B Mold 12 Mold cavity 14 Spray nozzle 16 Arm 18 Spray agent 18a Deposit of sediment of spray agent 20 Spray agent tank 22 Flow path 24 Cylinder means 25 Cylinder 26 Piston 28 Piston rod 30 Storage chamber 30a Supply / discharge port 30b Discharge Outlet 30c Discharge valve 31 Stirrer 32 Solenoid valve 34 Motor 36 Ball screw 38 Electric actuator 40 Slider 42 Joining member 44 Floating joint 46 Air tank 48 Air piping 50 Solenoid valve 52 Controller 54 Encoder

Claims (3)

[Claims] 1. A storage chamber, which is provided in a flow path between a spray agent tank and a spray nozzle and stores a spray agent, is connected to the interior of the storage chamber, and a cylinder means for temporarily storing the spray agent is provided on a piston side thereof. An electric actuator is provided in which the compartments are connected in a direction in contact with the side surface of the storage chamber, and an electric actuator for reciprocatingly driving a piston of the cylinder means at a variable moving speed is provided. A mold spray device comprising a controller for changing and controlling a driving speed of an electric actuator. 2. A bottom portion of the storage chamber is formed in a cone shape, and a discharge valve for discharging a sediment generated by sedimentation and separation of a solid component of the spray agent in the storage chamber is provided at a lower portion of the storage chamber. The mold spraying device according to claim 1, wherein: 3. The stirrer according to claim 1, wherein a stirrer for stirring the spray is disposed in the storage chamber in order to prevent solid components of the spray from separating and settling in the storage chamber. Mold spray equipment.