JP2005307330A - Temporary storing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To temporarily store a metal lump which is before shape working such as cutting, grinding and boring or during the shape working, in an inexpensive liquid which is easily handled by a simple device constitution without oxidizing and corroding the same. <P>SOLUTION: As the liquid used for dipping a metal lump, water is used, and, regarding a means of reducing oxygen being the main cause for generating and progressing the oxidation corrosion of the metal lump, gaseous nitrogen generated from a gaseous nitrogen generator communicated and connected to a compressor is made into a bubble shape and is jetted into the water from a nozzle member with a plurality of holes arranged in the vicinity of the bottom part in a water tank. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

Detailed Description of the Invention

  The present invention relates to an apparatus for temporarily storing a metal lump.

  When temporarily storing a metal lump before or during shape processing such as cutting, grinding, or fisturing, contact between the metal lump and the main cause of oxidative corrosion of the surface, or so-called rust, is caused. In general, a method of dipping and storing in a dedicated oil that has been subjected to deoxygenation treatment in an oil tank has been used.

Problems to be solved by the invention

The conventional method of immersing and storing a metal lump in oil and temporarily storing it has the effect of preventing oxidative corrosion, but has the following drawbacks.
(A) When processing the metal lump, it is necessary to wipe off the oil attached to the surface, which makes the handling of the operation cumbersome and reduces the working efficiency.
(B) Oil is scattered during the above operation and the surroundings are significantly contaminated.
(C) Oil will cause fire.
(D) It is necessary to purchase a dedicated oil solution, and the performance of the oil solution deteriorates with time, so the oil solution must be periodically replaced with a new one, and the cost of operating the equipment is high. It becomes.

Means for solving the problem

In order to solve the above problems, the temporary storage device according to the present invention uses water that is extremely easy to handle and low in cost as the liquid used for dipping the metal lump.
Then, as a means for reducing oxygen, which is the main cause of the oxidative corrosion of the metal mass, nitrogen gas is jetted into water in the form of bubbles.

  In the vicinity of the bottom of the water tank, a nozzle member having a plurality of holes through which nitrogen gas generated from the nitrogen gas generator is bubbled and ejected into the water in the water tank is disposed.

  A compressor connected to the nitrogen gas generator and capable of supplying air at all times is provided.

The invention's effect

The present invention provides the following effects.
(A) It is very easy to remove water attached to the surface when processing a metal lump, and therefore, handling in work is simplified and work efficiency is improved.
(B) Even if water splashes, the surroundings are not significantly polluted.
(C) There is no danger of fire.
(D) Uses inexpensive water, and the power only needs electric power to operate the compressor, and the operating cost of the apparatus can be reduced.

Hereinafter, it demonstrates in full detail based on FIG. 1 which shows embodiment of this invention.
FIG. 1 shows the equipment configuration of a temporary storage apparatus according to the present invention. The metal lump 3 before or during shape processing such as cutting, grinding, and fisturing is immersed in the water 2 of the water tank 1.

  The nitrogen gas generator 7 is constantly supplied with air through an air pipe 10 connected in communication from the compressor 9, and the nitrogen gas generator 7 uses the supplied air pressure to pass through the gas separation membrane. Nitrogen gas with a purity of about 99% is generated.

  In the vicinity of the bottom of the water tank 1, a nozzle member 5 having a hole 4 for ejecting nitrogen gas 6 in the form of bubbles is disposed. The nozzle member 5 and the nitrogen gas generator 7 are connected in communication with each other through a nitrogen gas pipe 8, and the nitrogen gas 6 generated from the nitrogen gas generator 7 is ejected in the form of bubbles by the nozzle member 5.

  Here, when the dissolved oxygen in water and the progress of oxidative corrosion are considered with reference to FIG. 2, the progress of oxidative corrosion of the metal surface immersed in water increases in proportion to the dissolved oxygen concentration in the water. I understand that

  When water comes into contact with oxygen, oxygen is dissolved from the gas-liquid interface by the partial pressure, and the dissolved oxygen concentration eventually becomes saturated. About 9 ppm of oxygen is usually saturated and dissolved in water at 20 ° C under 1 atm.

  When nitrogen gas is jetted into water with dissolved oxygen in the form of bubbles, the dissolved oxygen moves into the bubbles to satisfy the vapor-liquid equilibrium, and the dissolved oxygen concentration in the water decreases.

  A nitrogen gas 6 is continuously ejected from the nozzle member 5 in the form of a large amount of fine bubbles. Since the bubbles are fine, the gas-liquid interface between water and nitrogen gas is large, and the gas-liquid contact time is long because it slowly rises in water. Thereby, the dissolved oxygen in water can be reduced efficiently.

  Nitrogen gas 6 is continuously ejected continuously, and even if oxygen is redissolved in water, the nitrogen gas 6 is immediately reduced. Therefore, a low dissolved oxygen concentration is always maintained.

  FIG. 3 shows how the dissolved oxygen concentration is reduced by the temporary storage device according to the present invention. For example, when nitrogen gas having a purity of about 98% is spouted at 5 L / min into water containing 7 ppm of dissolved oxygen, the dissolved oxygen concentration is reduced to about 1 ppm in about 10 minutes, Thereafter, the equilibrium state can be maintained at this concentration.

  Assuming that the dissolved oxygen concentration is reduced to 1 ppm by operating the temporary storage device according to the present invention, as shown in FIG. 2, when compared with water having a normal dissolved oxygen concentration at 20 ° C. under 1 atm, oxidation The rate of progress of corrosion can be suppressed to about 1/9.

  Since the nitrogen gas generator 7 used in the temporary storage device according to the present invention only needs to supply several liters of nitrogen gas per minute, the nitrogen gas generator 7 and the compressor 9 connected to the nitrogen gas generator 7 can be reduced in size.

  Moreover, the nozzle member 5 which ejects the nitrogen gas 6 arrange | positioned in the bottom part vicinity of the water tank 1 in bubble shape can form about several millimeters fine bubble.

  The nitrogen gas pipe 8 that connects the nitrogen gas generator 7 and the nozzle member 5 and the air pipe 10 that connects the nitrogen gas generator 7 and the compressor 9 are flexible and have a small pipe diameter. Some materials can be used and no special support is required.

  As described above, the apparatus is small in size and easy to install, and a predetermined effect can be obtained.

It is an apparatus block diagram which shows embodiment of the temporary storage apparatus which concerns on this invention. It is a graph which shows the relationship between dissolved oxygen concentration and corrosion progress rate. It is a graph which shows a time-dependent change of the dissolved oxygen concentration in water using the temporary storage apparatus which concerns on this invention.

Claims (2)

  A water tank 1 for immersing and storing a metal lump 3 before or during shape processing such as cutting, grinding and fisturing, and in order to reduce dissolved oxygen in the water 2 in the water tank, it is jetted into water in the form of bubbles. A temporary storage device comprising a nitrogen gas generator 7 for producing nitrogen gas 6.   2. A nozzle member 5 having a plurality of holes 4 for blowing nitrogen gas generated from the nitrogen gas generator 7 into bubbles in the water in the water tank is disposed near the bottom of the water tank. Temporary storage device.

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