JPH02115033A - Automatic adjusting apparatus for forging die lubricant - Google Patents

Abstract

PURPOSE:To measure graphite concentration without being affected by external factors and automate the graphite measurement and adjustment by measuring the electric conductivity of the lubricant containing the graphite in a dispersed form for detecting the graphite concentration. CONSTITUTION:The electric conductivity of a forging die lubricant with graphite particles dispersed therein inside a tank is detected and, from this conductivity, the concentration of the graphite in the tank lubricant is calculated and the amount of the lubricant is detected. Based on the graphite concentration and amount of the lubricant thus obtained, the amounts of an aqueous graphite dispersing solution and water to be fed to the tank are calculated and they are fed to the tank on this basis. The feed control thereof based on the results of such calculation permits an automatic measurement and adjustment of the concentration without being directly affected by external factors and a device free from malfunction and easy in maintenance by reason of a simple mechanical structure can be provided for automatic adjustment of the forging die lubricant.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an automatic mixing device for a forging die lubricant, and more specifically, the present invention relates to an automatic blending device for a forging die lubricant, and more specifically, it is a method for adjusting the concentration of a forging die lubricant consisting of an aqueous dispersion of graphite particles. The present invention relates to a device that stably detects and automatically prepares a forging die lubricant having a predetermined graphite concentration.

[Conventional technology]

Lubricating fluid is applied to the mold surface during forging work to reduce wear on the friction surfaces, prevent wear and seizure, improve material flow and release from the mold, and extend the life of the mold. In addition to fats and oils, molybdenum disulfide, etc., an aqueous solution of fine graphite powder is used as a lubricant for such forging molds. If the concentration of the lubricating liquid is inappropriate, the desired lubricating properties cannot be obtained, and if the concentration is too high, the lubricating liquid will be exhausted due to the lubricant being taken out, so it is necessary to manage the lubricating liquid concentration to an appropriate concentration.

Conventionally, in the case of a graphite-based lubricating liquid, the concentration of the lubricating liquid has been optimized by measuring the specific gravity using a float, taking advantage of the fact that the graphite content is proportional to the specific gravity of the lubricating liquid. and,
The lubricating fluid is prepared manually using the stock solution and water based on this specific gravity measurement.

[Problem to be solved by the invention]

However, the above specific gravity measurement method has a problem in that it lacks stability because the specific gravity easily changes when disturbing substances such as oil and ash are mixed into the lubricating fluid. In addition, graphite-based lubricating liquid is very easy to solidify and is black, so the float type has problems such as malfunctions and frequent reading errors. Furthermore, while the mold lubricant is in use, the liquid is constantly stirred, so it is difficult to automatically measure the concentration using a float type and automatically mix the liquid.

Therefore, an object of the present invention is to stably measure the concentration of a graphite-based lubricant regardless of disturbances, and to automate concentration measurement and preparation.

[Means to solve the problem]

In order to achieve the above object, the present invention calculates the graphite particle concentration from the conductivity of a forging die lubricant made by dispersing graphite particles in water, and based on this graphite particle concentration, it To provide an automatic blending device for a forging die lubricant, which is characterized in that the concentration of the forging die lubricant is adjusted within a desired value or range by automatically controlling the replenishment amount of each of the die lubricant stock solution. .

[For production]

The aqueous solution used as a forging die lubricant generally contains graphite as a lubricating component and an inorganic salt as a film forming aid and protective colloid. This inorganic salt dissociates into cations and anions in water, and the anions exist in a form surrounding graphite particles, but graphite particles are chemically very stable and do not ionize. If the particle size and purity of graphite, the type of film forming aid, protective colloid agent, type of water, temperature, pressure, etc. are constant, the conductivity of the mold lubricant and the graphite concentration are illustrated in Figure 3. A certain relationship holds true.

The higher the concentration of graphite, the higher the conductivity, and the lower the concentration, the lower the conductivity. Therefore, the present invention adopts a method of detecting graphite concentration by measuring the conductivity of graphite-based lubricating fluid, thereby measuring graphite concentration stably against external factors, and automating concentration measurement and formulation. make it possible to

〔Example〕

FIG. 1 shows an automatic mixing device for forging die lubricating fluid according to an embodiment of the present invention.

The lubricating liquid 2 in the tank 1 is an aqueous liquid in which fine graphite particles are dispersed, and is stirred and mixed by a stirrer 3 to make it uniform.

A positive electrode 4 and a negative electrode 5 are immersed in the lubricating liquid 2 in the tank 1, and the conductivity of the lubricating liquid 2 is detected by a conductivity detector 6 using these electrodes 4.5. The method for measuring the conductivity of lubricating fluid will be explained with reference to FIG. 2. In the figure, 7 is a load resistance, 8 is an ammeter, and 9 is a power source. In the circuit shown in Fig. 2, if the power supply voltage E, the resistance between electrodes in the liquid R1, the load resistance r, and the current is determined, and furthermore, the conductivity of the lubricant 2 is determined. FIG. 3 shows an example of the relationship between the electrical conductivity and graphite concentration of a graphite-based lubricating fluid. It is observed that the conductivity increases with increasing graphite concentration.

Returning to FIG. 1, a liquid level detector 10 for the lubricating liquid 2 is provided in the tank l, and the obtained liquid level information is transmitted to a conductivity concentration converter based on the signal from the conductivity detector 6. It is sent to the concentration correction calculator 12 together with the graphite concentration signal converted in step 11. Incidentally, the conductivity-concentration conversion can also be performed using calculations that take into account other information such as the liquid temperature and the type of stock solution in addition to the conductivity.

A signal indicating the amount of concentrated undiluted solution in the lubricant undiluted solution tank 13 is also sent to the concentration correction calculator 12 via the liquid amount detector 14 in order to confirm the remaining amount. The concentration correction calculator 12 replenishes the water and stock solution necessary to adjust the concentration of the lubricant fluid 2 in the tank 1 based on the concentration and volume of the lubricant fluid 2 in the tank 1 and the signal of the volume of the stock solution. Calculate quantity. Based on the signals of the necessary replenishment amounts of water and concentrate obtained in this way, the water replenishment control unit 16 and the concentrate replenishment control unit 17 control the amount of water and concentrate to be sent from the water source 15 and the concentrate tank 13 to the tank 1.
The control is performed by opening and closing electromagnetic valves 18 and 19 via.

As a result of controlling the amount of water and stock solution supplied to the tank 1 in this way, the lubricating fluid 2 formed in the tank 1 by the water and stock solution being replenished and stirred by the agitator 3 is adjusted to a desired concentration. . Furthermore, even if the concentration of the lubricating liquid formed by adjusting the concentration in this way deviates from the desired value, the concentration is again measured by the electrodes 4 and 5 and the conductivity detector 6 and further corrected, The final concentration is adjusted to a desired concentration (or within a concentration range).

As described above, according to the present invention, there is provided a device for automatically dispensing a forging die lubricating fluid made by dispersing graphite particles in water, and the device includes a means for detecting the electrical conductivity of the lubricating fluid in a tank, and a means for detecting the conductivity of the lubricating fluid in a tank. means for calculating the graphite concentration of the lubricating fluid in the tank, means for detecting the amount of the lubricating fluid in the tank, and aqueous graphite dispersion for replenishing the tank based on the detected graphite concentration and amount of the lubricating fluid. A means for calculating the supply amount of the stock solution and water, a means for supplying the aqueous graphite dispersion stock solution to the tank, a means for supplying water to the tank, and a method for calculating the supply amount of the aqueous graphite dispersion stock solution based on the calculated supply amount of the aqueous graphite dispersion stock solution. An automatic mixing device for a forging die lubricant is provided, comprising means for controlling the replenishment of water and means for controlling the replenishment of water based on the calculated amount of water replenishment.

〔Effect of the invention〕

The automatic blending device for graphite-based forging die lubricating fluid of the present invention has the following advantages.

■ Even if components that change the specific gravity are mixed into the liquid, there will be no direct effect.

■ Since the mechanical structure is simple, there are no malfunctions due to adhesion of graphite, it is easy to hold, and there are no reading errors.

■ Automatic concentration measurement, constant measurement, and automatic compounding do not require human intervention.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an automatic lubricating liquid mixing device according to the present invention;
Figure 2 is a schematic diagram explaining the method for measuring the conductivity of lubricating fluid, Figure 3
The figure is a graph showing an example of the relationship between the electrical conductivity and graphite concentration of a forging die lubricant. ■... Tank, 2... Lubricating liquid, 3... Stirrer, 4... Positive electrode, 5... Negative electrode,
13... Raw solution tank, 15... Water source, 18, 19... Solenoid valve.

Claims (1)

[Claims] 1. Determine the graphite particle concentration from the conductivity of the forging die lubricant made by dispersing graphite particles in water, and calculate the respective replenishment amounts of water and the concentrated forging die lubricant solution based on this graphite particle concentration. 1. An automatic mixing device for a forging die lubricant, characterized in that the concentration of the forging die lubricant is adjusted within a desired value or range by automatically controlling the forging die lubricating liquid.