JP3227041B2 - Operation control device for die casting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various casting processes that are operated by a hydraulic cylinder, such as a core casting / returning operation, an injection operation, or a product pushing operation, in a die casting machine. it relates operation control device for controlling the operation.

[0002]

[Technical background] In the casting process using a die casting machine,
For example, hydraulic cylinders that are built into a die-casting machine and operate, such as a core cylinder for performing a core entry / return operation and an injection cylinder for performing an injection operation, move the piston rod forward and backward. In many cases, it is necessary to accurately detect and control the amount, that is, the operating position of the piston rod.

[0003]

Therefore, conventionally, electric switches such as limit switches and variable inductance sensors are used to detect and control the amount of forward / backward movement of the piston rod in each hydraulic cylinder, that is, the operating position of the piston rod. I was

However, since the limit switch requires a relatively large installation space, it is often limited in the installation place, and furthermore, only the electric wiring must be separately laid in the vicinity of each hydraulic cylinder. In addition, failures are likely to occur in a bad environment such as a release agent or water, and the accuracy is low. In that case, the setting change was very troublesome.

Further, the variable inductance sensor has high control accuracy, but is built in the sleeve, so that the electric wiring must be laid directly on the hydraulic cylinder, the maintenance is very poor, and the existing hydraulic cylinder is very poor. There was a problem that the cost could not be increased because it could not be incorporated.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is not restricted by the installation location, and it is necessary to lay electric wiring near each hydraulic cylinder. Operation in die casting, which can detect and control the operating position of the piston rod with high accuracy even in a bad environment, and can easily change the setting of the operating range even from a place away from the hydraulic cylinder. No control device is to be provided.

[0007]

An operation control apparatus for a die casting machine according to the present invention that achieves the above object is a die casting machine.
In and out of a hydraulic cylinder built into the machine's hydraulic circuit
A flow sensor for detecting the amount of hydraulic oil in and out;
Is the amount of movement of the piston rod of the hydraulic cylinder.
And detects the operating position of the piston rod based on the flow rate.
And a detector for controlling the output.
You. At this time, disconnect the flow sensor from the direction of the hydraulic cylinder.
It is characterized by being connected to the pump side from the valve change.
For multiple hydraulic cylinders built into the hydraulic circuit of the strike machine
The flow rate of hydraulic oil with one or more flow sensors
To control the operation of each hydraulic cylinder.
No.

[0008]

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawing shown in FIG. The present invention is directed to hydraulic cylinders such as a core cylinder, an injection cylinder, a product extrusion cylinder, and a secondary pressurization cylinder incorporated in a hydraulic circuit of a die casting machine. It will be understood from the following description that a single-acting cylinder, a returning cylinder, a plunger type or a piston type can be applied regardless of the operation type.

In the illustrated hydraulic cylinder 1, a piston rod 13 is integrated with a piston 12 movably installed in a cylinder 11 so as to protrude and move from the cylinder 11. An example of a piston type return cylinder in which a working oil inlet / outlet 15a, 15b is formed in a chamber 14a and a rod-side oil chamber 14b, respectively, is shown.

The hydraulic cylinder 1 is integrally installed at a predetermined location of a die casting machine (not shown), and supplies hydraulic oil to the hydraulic cylinder 1 of the die casting machine, that is, hydraulic oil to the hydraulic oil inlets and outlets 15a and 15b. Piping 2
a, 2b are connected to perform the required operation.

Then, the flow rate sensor 3 is connected to one or both of the two pipes 2a and 2b connected to the hydraulic cylinder 1 (in the embodiment, the pipe 2a connected to the piston side oil chamber 14a). The flow rate of the hydraulic oil flowing through the cylinder 1 is used as the movement amount of the piston rod 13 and the piston rod 13
Is detected.

At this time, the flow sensor 3 is connected to the hydraulic cylinder 1
It is preferable to connect to the pump side from the directional switching valve (not shown). Then, as compared with the case where the flow rate sensor 3 is connected to another place, it is possible to more accurately detect the amount of hydraulic oil flowing into and out of the hydraulic cylinder 1.

The flow rate sensor 3 is provided for detecting the flow rate of hydraulic oil flowing through the hydraulic cylinder 1,
This is for detecting the amount of hydraulic oil flowing into and out of the piston-side oil chamber 14a or the rod-side oil chamber 14b of the eleventh embodiment. Is used to generate an electric pulse for each tooth of the gear and to output the pulse signal to the detector 4.

The detector 4 is a cylinder 11 of the hydraulic cylinder 1
Using the fact that the flow rate of hydraulic oil flowing into and out of the hydraulic cylinder 1 is proportional to the travel distance of the piston rod 13, the flow rate of hydraulic oil detected by the flow rate sensor 3 (flow rate) is calculated by the travel distance of the piston rod 13 To detect and control the operating position of the piston rod 13.

That is, the operating amount of the piston rod 13 is detected and controlled by converting the input / output amount (flow rate) of the hydraulic oil detected by the flow sensor 3 into the moving amount of the piston rod 13 or the cylinder of the hydraulic cylinder 1 is controlled. The operation position of the piston rod 13 is detected and controlled by detecting the total flow rate of the hydraulic oil flowing into and out of the inside 11. Specifically, the flow sensor 3
A counter unit for converting the flow rate of hydraulic oil into a movement amount of the piston rod 13 based on an electric signal output from the control unit, a display unit 41 for digitally displaying the converted value, and a piston rod
The controller 13 is provided with setting sections 42a and 42b for arbitrarily setting the amount of forward and backward movement of the thirteen, and is electrically connected to the flow rate sensor 3 by the wiring 5 and controls the hydraulic cylinder 1 (FIG. (Not shown).

The hydraulic circuit of the die casting machine (piping 2
When the flow sensor 3 is connected to a and / or the pipe 2b),
The hydraulic oil flowing into and out of the piston side oil chamber 14a (and / or the rod side oil chamber 14b) of the hydraulic cylinder 1 is
When flowing through the pipe 2a (and / or the pipe 2b), the flow amount is always detected by the flow rate sensor 3. The input / output amount information (flow rate information) of the hydraulic oil detected by the flow rate sensor 3 is sent to the detector 4 as an electric signal,
The amount of flow (flow rate) of the hydraulic oil is
The amount of movement of the piston rod 13, ie, the operating position of the piston rod 13, is converted and displayed, and the position information of the piston rod 13 is sent to the controller that controls the hydraulic cylinder 1,
The operation of the hydraulic cylinder 1 is controlled.

Therefore, by setting in advance the amount of hydraulic oil that enters and leaves the piston-side oil chamber 14a (and / or the rod-side oil chamber 14b) of the hydraulic cylinder 1 by the setting sections 42a and 42b of the detector 4. When the set flow rate is reached, that is, when the hydraulic cylinder 1 reaches the entrance limit / return limit, the same function as an on / off switch for outputting a predetermined signal can be provided.

This will be described with reference to the embodiment shown in FIG. 1 (an example in which the present invention is applied to a hydraulic cylinder for entering / returning the core). together to electrically connect the wiring 43a to _1, the return limit setting portion 42b of the detector 4 are electrically connected by wiring 43b to the relay R _2. When reaching the incoming limit of the hydraulic cylinder 1, the detector is from 4 to enter limit setting unit 42a outputs a predetermined signal injection solenoid valve SV ₁ is operated Working relay R _1, the addition of the hydraulic cylinder 1 If the return limit is reached, in which the predetermined signal from the detector 4 returns limit setting portion 42b is output relay R ₂ to operate the solenoid valve SV ₂ for opening the mold working.

In the second embodiment shown in FIG. 2, a plurality of hydraulic cylinders 1 incorporated in a hydraulic circuit of a die casting machine are shown.
For each of (a), (b) and (c), the flow rate of the hydraulic oil flowing through each hydraulic cylinder 1 (a) (b) (c) is detected by one flow sensor 3 as a whole. Hydraulic cylinder 1 (a) (b)
The operation of (c) is controlled, and the same components as those of the above-described first embodiment (FIG. 1) are denoted by the same reference numerals and description thereof is omitted. In the figure, reference numeral 6 denotes a distributor.

[0021]

The operation control in the die-casting machine of the present invention, according to the present invention
Equipment is Such a, since in order to detect and control the operating position of the moving amount i.e. the piston rod of the piston rod by detecting entry and exit of hydraulic fluid to and from the hydraulic cylinder, the following effects. Even if it is not near the hydraulic cylinder, it can be installed anywhere where the hydraulic circuit (pipe) of the hydraulic cylinder is located, and there is no restriction on the installation location. There is no need to lay electrical wiring near the hydraulic cylinders, which makes installation of equipment easier and cheaper. It is possible to detect and control the position of the piston rod of the hydraulic cylinder with high accuracy even in a bad environment where a release agent or water is applied. The setting change of the operating range of the piston rod can be easily performed from a place remote from the hydraulic cylinder, for example, from an operation panel of a die casting machine, and can be safely performed including maintenance. By setting in advance the amount of hydraulic oil flowing into and out of the hydraulic cylinder, it can serve as a switch for controlling the operating range of the piston rod. Therefore, it is not necessary to use electric switches such as a limit switch and a variable inductance sensor as in the related art, and the operation can be controlled with high accuracy. In combination with the above-mentioned effects, the accident such as disconnection of the wiring cord at the time of mold replacement is eliminated, and the mold can be easily replaced. By independently detecting the entering amount and the returning amount of the hydraulic oil for operating the hydraulic cylinder, it is also possible to detect oil leakage in the hydraulic circuit.
The operation of a plurality of hydraulic cylinders can be controlled by one flow sensor. When the hydraulic cylinder is a core cylinder, accurate core position detection during core entry / return operation can be performed, and when the hydraulic cylinder is a secondary pressure cylinder, , The amount of pressing of the pressing pin can be controlled.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a first embodiment of the present invention.

FIG. 2 is a schematic view showing a second embodiment of the present invention.

[Explanation of symbols]

1: Hydraulic cylinder 11: Cylinder 12: Piston 13: Piston rod 14a: Piston side oil chamber 14b: Rod side oil chamber 15a, 15b: Hydraulic oil inlet / outlet 2a, 2b: Piping 3: Flow sensor 4: Detector 41: Display Part 42a, 42b: Setting part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B22D 17/32 B22D 17/22

Claims (4)

(57) [Claims] 1. The hydraulic circuit of a die casting machine
Detects the amount of hydraulic oil entering and exiting the hydraulic cylinder
A flow rate sensor and a flow rate of the hydraulic oil
Detected as the movement amount of the ston rod and based on the flow rate,
From the detector that detects and controls the operating position of the ston rod
Operation control device for die casting machine
Place. 2. It is incorporated in a hydraulic circuit of a die casting machine.
Detects the amount of hydraulic oil entering and exiting the hydraulic cylinder
Pump the flow sensor from the directional switching valve of the hydraulic cylinder
The operation control device for a die-casting machine according to claim 1, wherein the operation control device is connected to a side of the die casting machine. 3. It is incorporated in a hydraulic circuit of a die casting machine.
One or more flow rates for multiple hydraulic cylinders
Each hydraulic cylinder is detected by detecting the flow rate of hydraulic oil with a sensor.
The operation of claim 1 is controlled.
Is an operation control device in the die casting machine according to 2 . 4. The hydraulic cylinder according to claim 1, wherein the hydraulic cylinder is a core cylinder.
Or injection cylinder or product extrusion cylinder or secondary
The operation control device for a die casting machine according to claim 1, wherein the operation control device is a pressurizing cylinder or the like .