JP2006159208A - Release agent reproducing system and method for measuring graphite concentration in release agent - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a release agent reproducing system and a method for measuring graphite concentration in the release agent with which such problem as to generate the measured error caused by sticking of the graphite in the release agent to an electrode etc., in comparison with the conventional electrode type concentration measuring meter, can be restrained, and the concentration measuring meter can be used for long time. <P>SOLUTION: This release agent reproducing system, is provided with a release agent applying device 10 for applying the release agent containing the graphite and the water by injecting onto the die, a release agent waste solution vessel 20 for recovering the waste solution of the release agent generated by dropping of a part of the release agent injected onto the die, a release agent concentration adjusting vessel 40 for adjusting the graphite concentration in the release agent waste solution fed through a release agent cleaning vessel 30 from the release agent waste solution vessel 20. The release agent concentration adjusting vessel 40 is provided with a release agent concentration measuring instrument 43 for measuring the concentration of the release agent. The release agent concentration measuring instrument 43 is provided with an electromagnetic concentration meter 43a, with which the electromagnetic field is induced into the release agent and an electric conductivity of the release agent is calculated from the intensity of the electromagnetic field, and in this way, the graphite concentration in the release agent is calculated. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a release agent regeneration system that reuses a release agent waste liquid generated by dripping a part of a graphite release agent injected into a mold, and to measure the graphite concentration of the graphite release agent. The present invention relates to a method for measuring the graphite concentration of a releasing agent.

  In a press machine that processes a target object by applying pressure to the target object using a mold, a method of applying a release agent to the surface of the mold is used. By spraying and applying a release agent to the surface of the mold, it is possible to improve the mold separation from the mold of the processed product, and to prevent the processed product from sticking to the surface of the mold. .

  As the release agent applied to the mold, for example, a graphite release agent in which graphite is dispersed in water is used. In general, in water-soluble mold release agents in which mineral oil is dispersed in water or resin mold release agents using resin, mineral oil etc. is evaporated by high-temperature molten metal or thermally decomposed. While the gas generated by the gas remains in the processed product and causes defects such as pores, graphite mold release agents do not cause such problems, and have high pressure transmission and heat retention. In addition, the hot water flow is superior to that of a water-soluble release agent.

  On the other hand, a part of the release agent injected into the mold is dropped from this mold as a release agent waste liquid. In addition to graphite and water, impurities such as oil adhering to the mold are mixed in the release agent waste liquid.

This release agent waste liquid is discarded as industrial waste, but disposal of the release agent waste liquid is expensive, and environmental awareness is increasing year by year, and waste disposal contractors refuse to collect the release agent waste liquid. There are things to do.
For this reason, a method of removing impurities in the release agent waste liquid generated by dropping a part of the release agent from the mold and reusing the purified release agent waste liquid is considered (for example, Patent Document 1).

  According to the release agent regeneration system shown in Patent Document 1, the release agent regeneration solution generating means mixes the release agent stock solution or water with the release agent waste liquid generated by the application of the release agent to the mold. Thus, a release agent regenerating liquid having a preset concentration is generated. Thus, in the conventional release agent regeneration system, the release agent waste liquid is adjusted to a preset concentration and then reused as the release agent regeneration liquid. A sufficient function as a mold can be exhibited.

In such a release agent regeneration system, it is necessary to measure the concentration of the release agent waste liquid in advance in order to produce a release agent regeneration solution having a preset concentration.
As a method for measuring the concentration of the release agent, an electrode-type measurement method (for example, patent), in which a pair of electrodes is immersed in the release agent and the conductivity of the release agent is measured to calculate the concentration of the release agent. (Refer to Document 2) Or, ultrasonic measurement that calculates the concentration of the release agent by immersing the ultrasonic transceiver in the release agent and measuring the amplitude of the reflected wave of the ultrasonic wave sent into the release agent A method (for example, refer to Patent Document 3) is known.

JP 2004-230399 A JP-A-9-26404 JP 2001-183354 A

  However, when using a graphite mold release agent in which graphite is dispersed in water as the mold release agent, when measuring the concentration of the mold release agent by the above-described electrode type or ultrasonic type concentration measurement method, The graphite contained in the agent may adhere to the electrode or ultrasonic transmitter / receiver immersed in the release agent, resulting in a measurement error. For this reason, electrode-type or ultrasonic-type concentration measuring instruments cannot be immersed in a release agent for a long period of time, and must be frequently removed from the release agent and the graphite adhering to the electrodes and ultrasonic transmitter / receiver must be washed away. There is a problem that must be.

The present invention has been made in consideration of such points, and can reduce the amount of waste of the release agent waste liquid, can reduce the processing cost of the release agent waste liquid, The release agent regeneration solution can exhibit sufficient functions as a release agent, and the graphite in the release agent can be used as an electrode or ultrasonic wave as compared to conventional electrode type or ultrasonic concentration measuring instruments. An object of the present invention is to provide a release agent regeneration system that can suppress the occurrence of a measurement error due to adhesion to a transmitter / receiver and can use the release agent concentration measuring device for a long time. To do.
In addition, the present invention has a problem that graphite in the release agent adheres to the electrode and the ultrasonic transmitter / receiver as compared with the conventional method of measuring the concentration of the release agent by the electrode type or ultrasonic type. It is an object of the present invention to provide a method for measuring the graphite concentration of a release agent that can suppress the occurrence and can measure the graphite concentration of the graphite release agent over a long period of time.

The present invention is caused by dropping a parting agent sprayed onto a mold, a parting agent coating apparatus that sprays and applies a parting agent containing graphite and water onto the mold, and this The release agent waste liquid tank that collects the release agent waste liquid mixed with impurities adhering to the mold, and the release agent waste liquid is sent from the release agent waste liquid tank, and the impurities in this release agent waste liquid are removed. The release agent purification tank and the release agent waste liquid purified by the release agent purification tank are received, and the purified release agent waste liquid and the release agent stock solution or water containing graphite are mixed and set in advance. A release agent concentration adjusting tank and a release agent concentration adjusting tank for generating a graphite concentration releasing agent regenerating liquid and sending the releasing agent regenerating liquid to the releasing agent coating apparatus again. A release agent concentration measuring device for measuring the graphite concentration of the release agent in the adjustment tank, and a release agent concentration measurement device provided in the release agent concentration adjustment tank. When the measured graphite concentration of the release agent is higher than the set concentration, water is sent to the release agent concentration adjustment tank, and when the measured concentration of the release agent is lower than the set concentration, the release agent concentration adjustment tank is released. A release agent concentration control device that sends the stock solution to the mold release agent. A release agent regeneration system having an electromagnetic densitometer that calculates the graphite concentration of a release agent according to conductivity.
According to such a release agent regeneration system, the release agent waste liquid is adjusted to a preset graphite concentration and then sent again to the release agent coating apparatus, and sprayed onto the mold as a release agent regeneration liquid and applied. Therefore, the waste amount of the release agent waste liquid can be suppressed, and the processing cost of the release agent waste liquid can be reduced. Further, since the graphite concentration of the release agent regenerating solution is adjusted to be constant, the release agent regenerating solution can exhibit a sufficient function as a release agent. Moreover, since the graphite concentration of the release agent is measured by an electromagnetic densitometer, the graphite in the release agent adheres to the electrode and ultrasonic transmitter / receiver compared to conventional electrode type and ultrasonic type concentration measuring instruments. As a result, it is possible to prevent the occurrence of a measurement error, and the mold release agent concentration measuring instrument can be used for a long time.

In the release agent regeneration system of the present invention, a display for displaying the set concentration of the release agent preset in the release agent concentration adjusting tank and the measured concentration of the release agent measured by the release agent concentration measuring device, respectively. It is preferable to further include a portion.
According to such a release agent regeneration system, the operator can always monitor the state in the release agent concentration adjustment tank, and the graphite concentration of the release agent regeneration solution sent to the release agent application device can be increased. It can be adjusted with high accuracy.

The present invention calculates the conductivity of the release agent from the step of inducing an electromagnetic field in the release agent containing graphite and water, and the strength of the electromagnetic field, and the graphite concentration of the release agent is determined according to this conductivity. A graphite concentration measurement method for a release agent, comprising: a calculating step.
According to such a method for measuring the concentration of graphite in the release agent, the graphite in the release agent adheres to the electrode and the ultrasonic transmitter / receiver as compared with the conventional method for measuring the concentration of the release agent by the electrode type or ultrasonic type. Thus, it is possible to prevent the occurrence of a measurement error, and the graphite concentration of the graphite mold release agent can be measured over a long period of time.

  According to the release agent regeneration system of the present invention, the release agent waste liquid is adjusted to a preset graphite concentration and then sent again to the release agent coating apparatus, and sprayed onto the mold as the release agent regeneration liquid and applied. Therefore, the waste amount of the release agent waste liquid can be suppressed, and the processing cost of the release agent waste liquid can be reduced. Further, since the graphite concentration of the release agent regenerating solution is adjusted to be constant, the release agent regenerating solution can exhibit a sufficient function as a release agent. Moreover, since the graphite concentration of the release agent is measured by an electromagnetic densitometer, the graphite in the release agent adheres to the electrode and ultrasonic transmitter / receiver compared to conventional electrode type and ultrasonic type concentration measuring instruments. As a result, it is possible to prevent the occurrence of a measurement error, and the mold release agent concentration measuring instrument can be used for a long time.

  According to the method for measuring the graphite concentration of the release agent of the present invention, the step of inducing an electromagnetic field in the release agent containing graphite and water, and calculating the conductivity of the release agent from the strength of the electromagnetic field, And the step of calculating the graphite concentration of the release agent according to the rate, the graphite in the release agent is compared with the conventional method of measuring the concentration of the release agent by the electrode type or ultrasonic type. It is possible to prevent the occurrence of a measurement error due to adhesion to the ultrasonic transmitter / receiver, and to measure the graphite concentration of the graphite-based mold release agent over a long period of time.

A release agent regeneration system according to an embodiment of the present invention will be described with reference to FIGS.
Here, FIG. 1 is a configuration diagram showing a release agent regeneration system according to the present embodiment, and FIG. 2 is a detailed configuration diagram showing details of a release agent purification tank of the release agent regeneration system of FIG.
FIG. 3 is an explanatory view for explaining the principle of the electromagnetic densitometer according to the mold release agent concentration measuring device, and FIG. 4 is a perspective view showing an example of the structure of the detection unit of the electromagnetic densitometer of FIG. FIG. 5 is a graph showing the relationship between the graphite concentration (%) of the release agent and the electrical conductivity (ms / cm).

  As shown in FIG. 1, the release agent regeneration system includes a release agent coating apparatus 10 that sprays and applies a release agent to a mold 11 such as a press machine, and a release agent sprayed to the mold 11. A release agent waste liquid tank 20 that collects a release agent waste liquid generated when a part of the liquid is dropped, and a release agent that is provided downstream of the release agent waste liquid tank 20 to remove impurities in the release agent waste liquid. A septic tank 30 and a mold release agent concentration that is provided on the downstream side of the mold release agent clarification tank 30 and adjusts the graphite concentration of the mold release agent waste liquid from which impurities have been removed by the mold release agent clarification tank 30 to generate a mold release agent regenerated liquid And an adjustment tank 40.

  The release agent coating apparatus 10 has an injection nozzle (not shown) for spraying and applying the release agent onto the surface of a mold 11 such as a press machine. In this release agent coating apparatus 10, by applying a release agent to the surface of the mold 11, the mold release from the mold 11 becomes good, and the processed product adheres to the surface of the mold 11. To prevent it. Here, as the mold release agent applied to the mold 11, a graphite mold release agent in which graphite is dispersed in water is used.

  The release agent waste liquid tank 20 is provided below the release agent coating apparatus 10 so as to collect the release agent waste liquid generated when a part of the release agent sprayed onto the mold 11 is dropped. It has become. In this release agent waste liquid, impurities such as oil adhering to the mold 11 are mixed in addition to graphite and water.

The release agent purification tank 30 is configured such that the release agent waste liquid is sent from the release agent waste liquid tank 20 by the pump 21, and impurities such as oil in the release agent waste liquid are removed in the release agent purification tank 30. It is like that. As shown in FIG. 2, a drain pipe 32 is provided below the side surface of the release agent purification tank 30, and an oil recovery pipe 33 and an overflow pipe 34 are provided above the side surface.
In the release agent waste liquid sent to the release agent purification tank 30, impurities having a relatively high specific gravity in the release agent waste liquid are removed by the drain pipe 32, and an oil component having a relatively low specific gravity in the release agent waste liquid is also obtained. Is sent to the waste oil tank 35 through the oil recovery pipe 33 and discharged from the waste oil tank 35 to the outside of the system. Then, the release agent having a medium specific gravity contained in the release agent waste liquid sent to the release agent purification tank 30 is sent to the release agent tank 37 by the pump 36, and thus the release agent. Impurities in the agent waste liquid are removed.

  2 shows an example in which impurities such as oil in the release agent waste liquid are removed by one release agent purification tank 30, but in reality, the release agent purification tank 30 has, for example, five stages in series. The release agent waste liquid sent from the release agent waste liquid tank 20 is passed through these five stages of release agent purification tanks 30 to remove impurities such as oil.

  The release agent concentration adjustment tank 40 is configured to receive the release agent waste liquid purified by the release agent purification tank 30, and the release agent concentration adjustment tank 40 includes the release agent concentration adjustment tank 40. A water supply device 41 that supplies water to the release agent concentration adjustment tank 40 and a release agent stock solution supply device 42 that supplies the release agent stock solution to the release agent concentration adjusting tank 40 are connected to each other.

  The release agent concentration adjusting tank 40 is provided with a release agent concentration measuring device 43 for measuring the graphite concentration of the release agent in the release agent concentration adjusting tank 40. The release agent concentration measuring instrument 43 induces an electromagnetic field in the release agent, calculates the conductivity of the release agent from the strength of the electromagnetic field, and determines the graphite concentration of the release agent according to the conductivity. It has an electromagnetic densitometer 43a to calculate.

The principle of the electromagnetic densitometer 43a will be described in detail with reference to FIG.
As shown in FIG. 3, when two toroidal coils T ₁ and T ₂ are arranged in a measurement target solution (release agent), this measurement target solution is equivalent to each of the toroidal coils T ₁ and T ₂ and a chain. forming a circuit _{L 2} of interlinking one turn. Then, applying the AC voltages V ₁ to the primary coil L ₁ toroidal coil T _1, measured in the circuit L ₂ formed by a solution, induced currents proportional to the magnitude of the conductivity of the measured solution i flows. At the same time, the secondary coil _{L 3} of toroidal coil _{T 2} to the circuit _{L 2} and the primary coil, the voltage _{V 0} which is proportional to the current i flowing through the circuit _{L 2} is generated. Therefore, by measuring this voltage V ₀ , the conductivity (ms / cm) of the solution to be measured can be calculated.
Moreover, an example of the structure of the detection part of this electromagnetic densitometer 43a is shown in FIG.

  Next, in the calculation of the graphite concentration of the release agent by the electromagnetic densitometer 43a, a graph showing the relationship between the graphite concentration (%) of the release agent and the conductivity (ms / cm) as shown in FIG. 5 is used. . That is, when the electromagnetic densitometer 43a calculates that the conductivity of the release agent is a (ms / cm), a calibration curve A (x (graphite concentration of the release agent) in the graph = y (release) Conductivity of the agent) × 5), the graphite concentration of the release agent is calculated as a value of 5 × a (%), and + 3% according to the calculated graphite concentration of the release agent of 5 × a (%) Correction at a rate of ˜−2.8% is performed (see calibration curve B in the graph), and the graphite concentration of the release agent after correction is calculated. In this way, the electromagnetic densitometer 43a calculates the graphite concentration of the release agent based on the conductivity of the release agent.

  Further, as described above, the release agent concentration adjusting tank 40 is provided with the release agent concentration management device 44. When the graphite concentration of the release agent measured by the release agent concentration measuring device 43 is larger than the set concentration set in advance by an operator or the like, the release agent concentration management device 44 causes the water supply device 41 to release the release agent concentration. Water is supplied to the adjustment tank 40, and when the measured concentration of the release agent is smaller than the set concentration, the water supply device 41 so that the release agent stock solution supply device 42 sends the release agent stock solution to the release agent concentration adjustment tank 40. Further, the switching operation of the release agent stock solution supply device 42 is controlled.

  Further, as shown in FIG. 1, the release agent concentration adjustment tank 40 is provided with a release agent set concentration and a release agent concentration measuring device 43 set in advance in the release agent concentration adjustment tank 40 by an operator or the like. A display unit 45 is provided for displaying the measured measured concentration of the release agent. The display unit 45 is composed of, for example, a computer monitor or touch panel, and a signal is sent from the release agent concentration management device 44 to display the set concentration and measured concentration of the release agent in real time.

Next, the operation of the present embodiment having such a configuration will be described with reference to FIG.
As shown in FIG. 1, first, a release agent containing graphite and water is sprayed onto the surface of a mold 11 such as a press machine by a release agent coating apparatus 10 and applied to the mold 11.

  On the other hand, a part of the release agent sprayed on the mold 11 is dropped and sent as a release agent waste liquid to a release agent waste liquid tank 20 provided below the release agent coating apparatus 10. In this release agent waste liquid, impurities such as oil adhering to the mold 11 are mixed in addition to graphite and water.

  The release agent waste liquid in the release agent waste liquid tank 20 is sequentially sent to, for example, a five-stage release agent purification tank 30 by the pump 21, and impurities in the release agent waste liquid are removed in each release agent purification tank 30.

The release agent waste liquid purified by each release agent purification tank 30 is sent to the release agent concentration adjustment tank 40. Then, the graphite concentration of the release agent waste liquid in the release agent concentration adjusting tank 40 is measured by the electromagnetic concentration meter 43a of the release agent concentration measuring device 43, and the measured concentration information is transmitted to the release agent concentration management device 44. The
Here, the electromagnetic densitometer 43a induces an electromagnetic field in the release agent, calculates the conductivity of the release agent from the strength of the electromagnetic field, and releases the release agent based on the graph of FIG. 5 according to the conductivity. The graphite concentration of is calculated.

The release agent concentration management device 44 compares the measured concentration of the release agent measured by the electromagnetic densitometer 43a of the release agent concentration measuring device 43 with respect to a set concentration preset by an operator or the like. . Here, when the measured concentration of the release agent is larger than the set concentration, the release agent concentration management device 44 controls the water supply device 41 so that the water supply device 41 supplies water to the release agent concentration adjustment tank 40. send. When the measured concentration of the release agent is smaller than the set concentration, the release agent concentration management device 44 controls the release agent stock solution supply device 42 so that the release agent stock solution supply device 42 adjusts the release agent concentration. The release agent stock solution is sent to the tank 40.
In this way, the release agent concentration management device 44 keeps the graphite concentration of the release agent in the release agent concentration adjustment tank 40 constant.
The release agent whose graphite concentration is kept constant in the release agent concentration adjusting tank 40 is sent again to the release agent coating apparatus 10 as a release agent regenerating liquid, and reused for spraying and applying to the mold 11. Is done.

  As described above, according to the release agent regeneration system of the present embodiment, the release agent waste liquid is adjusted to a preset graphite concentration and then sent to the release agent coating apparatus 10 again as a release agent regeneration liquid. It can be reused to spray and apply to the mold 11. For this reason, the disposal amount of the release agent waste liquid can be suppressed, and the processing cost of the release agent waste liquid can be reduced. Further, since the graphite concentration of the release agent regenerating solution is adjusted to be constant, the release agent regenerating solution can exhibit a sufficient function as a release agent. In addition, since the graphite concentration of the release agent is measured by the electromagnetic densitometer 43a, the graphite in the release agent is transferred to the electrode and the ultrasonic transmitter / receiver as compared with the conventional electrode type or ultrasonic type concentration measuring device. It is possible to suppress the occurrence of a problem that measurement error occurs due to adhesion, and the mold release agent concentration measuring instrument 43 can be used for a long time.

  In addition, the release agent regeneration system displays a preset release agent concentration set in advance in the release agent concentration adjusting tank 40 and a measured concentration of the release agent measured by the release agent concentration measuring device 43. Since the display unit 45 is further provided, the operator can always monitor the state in the release agent concentration adjusting tank 40, and the graphite concentration of the release agent regenerating liquid sent to the release agent coating apparatus 10 can be further increased. It can be adjusted with high accuracy.

  According to the method for measuring the graphite concentration of the release agent of the present embodiment, the step of inducing an electromagnetic field in the release agent containing graphite and water, and calculating the conductivity of the release agent from the strength of the electromagnetic field, And the step of calculating the graphite concentration of the release agent in accordance with the conductivity, so that the graphite in the release agent is compared with the conventional method of measuring the concentration of the release agent by an electrode type or ultrasonic type. It is possible to suppress the occurrence of a problem that a measurement error occurs due to adhesion to an electrode or an ultrasonic transmitter / receiver. In addition, the graphite concentration of the graphite mold release agent can be measured over a long period of time.

It is a schematic block diagram which shows the mold release agent reproduction | regeneration system by this Embodiment. It is a detailed block diagram which shows the detail of the mold release agent purification tank of the mold release agent reproduction | regeneration system of FIG. It is explanatory drawing explaining the principle of the electromagnetic densitometer of a mold release agent concentration measuring device. It is a perspective view which shows an example of the structure of the detection part of the electromagnetic densitometer of FIG. It is a graph which shows the relationship between the graphite concentration (%) of a mold release agent, and electrical conductivity (ms / cm).

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Release agent application apparatus 11 Mold 20 Release agent waste liquid tank 21 Pump 30 Release agent purification tank 32 Drain pipe 33 Oil content collection pipe 34 Overflow pipe 35 Waste oil tank 36 Pump 37 Release agent tank 40 Release agent concentration adjustment tank 41 Water supply device 42 Release agent stock solution supply device 43 Release agent concentration measuring device 43a Electromagnetic concentration meter 44 Release agent concentration management device 45 Display unit

Claims (3)

A release agent coating apparatus for spraying and applying a release agent containing graphite and water to a mold;
A release agent waste liquid tank for recovering a release agent waste liquid which is generated by dripping a part of the release agent injected into the mold and mixed with impurities adhering to the mold;
A release agent waste liquid is sent from the release agent waste liquid tank, and a release agent purification tank for removing impurities in the release agent waste liquid,
A release agent having a preset graphite concentration by receiving the release agent waste liquid purified by the release agent purification tank and mixing the purified release agent waste liquid with a release agent stock solution or water containing graphite. A release agent concentration adjusting tank that generates a regeneration solution and sends the release agent regeneration solution to the release agent coating apparatus again;
A release agent concentration measuring device that is provided in the release agent concentration adjustment tank and measures the graphite concentration of the release agent in the release agent concentration adjustment tank;
When the graphite concentration of the release agent, which is provided in the release agent concentration adjustment tank and measured by the release agent concentration measuring instrument, is larger than the set concentration, water is sent to the release agent concentration adjustment tank, and measurement of this release agent is performed. A release agent concentration management device that sends a release agent stock solution to the release agent concentration adjustment tank when the concentration is lower than the set concentration;
The release agent concentration measuring instrument induces an electromagnetic field in the release agent, calculates the conductivity of the release agent from the strength of the electromagnetic field, and calculates the graphite concentration of the release agent according to this conductivity. A release agent regeneration system comprising a meter.   It further comprises a display unit for respectively displaying a predetermined concentration of the release agent set in the release agent concentration adjusting tank and a measured concentration of the release agent measured by the release agent concentration measuring device. Item 2. A release agent regeneration system according to Item 1. Inducing an electromagnetic field in a release agent comprising graphite and water;
Calculating the conductivity of the release agent from the strength of the electromagnetic field, and calculating the graphite concentration of the release agent according to the conductivity;
A method for measuring the graphite concentration of a mold release agent.

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