JPH04154978A - Surface treating device for aluminum or its alloy - Google Patents

Abstract

PURPOSE:To prevent the generation of a surface burn with a liquid chemicals and the splashing of gas with reaction by providing a shower device and an opening/closing type upper cover in such a manner that the aluminum products subjected to a liquid chemicals treatment at a high temp. can be immediately washed with water. CONSTITUTION:The shower device 4 is provided and the products 9 for treatment which rise fro a liquid chemicals tank 6 for surface treatment are immediately washed with water. The opening/closing type upper cover 5 is prevented the fall of the above-mentioned washing water into the liquid chemicals tank 6 for surface treatment. The aluminum products subjected to the liquid chemicals treatment at the high temp. are immediately washed with the water, by which the generation of the surface burn by the liquid chemicals is prevented and the splashing of the gas by the reaction of the liquid chemicals and the aluminum products is prevented.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to surface treatment of aluminum or its alloy, and particularly relates to an apparatus for surface treatment using a high temperature chemical solution such as chemical polishing treatment. It is something.

(Prior Art) Brightening treatment of aluminum or its alloys has traditionally been carried out using a chemical solution containing phosphoric acid as a main component with 2 to 4% nitric acid added, or a chemical solution containing several percent nitric acid and sulfuric acid. , high-temperature treatment at 95°C to 105°C is required to obtain sufficient glitter.

However, due to the high temperature of the chemical solution, the reaction progresses even while the chemical solution is being transported through the air until the next washing with water after treatment, producing nitrogen oxide gas with an irritating odor and salts formed by the reaction on the surface of the product. Surface burns, which dry and adhere to surfaces and cannot be washed with water, are more likely to cause defects.

Therefore, we had no choice but to sacrifice some of the brightness to achieve a temperature of 80°C to 9°C.
Measures have been taken to reduce the temperature of the chemical solution to 0°C and to speed up the transfer to washing with water, but there is a limit to increasing the speed, and only small items (total length of 50 cm or less) can be chemically polished. .

(Problems to be Solved by the Invention) As mentioned above, in surface treatment methods that involve high-temperature chemical treatment such as chemical polishing, there is a method for immediately rinsing with water after high-temperature chemical treatment and a method for preventing gases such as nitrogen oxides from scattering. It is about providing.

[Structure of the invention]

(Means for Solving the Problems) The means taken in the present invention to solve the above problems is to provide a top lid that can be opened and closed over the high temperature treatment tank, and a device that allows shower washing on top of the lid. It is.

Here, the shower washing device has an integral structure with the product conveyor and is provided with a hood so as to surround the product when the product is raised from the processing chemical solution.

Further, the upper lid on the treatment tank is open while the product to be treated is being treated with the chemical solution, and is closed immediately after the product to be treated rises.

The opening/closing signal for the top cover may be received from a conveyance program or by a conventional means such as a limit switch for the position of the product to be processed, and the opening/closing mechanism may be a conventional means such as an air actuator or an electric motor.

The shower rinsing device operates together with a conveyor for the products to be processed, and performs pre-treatment processes such as degreasing, which are normally carried out without washing water. The shower device operates for a certain period of time only when the product to be treated is raised.

Water is supplied to this mobile shower device through a bendable rubber hose, etc., and water flow is activated by a solenoid valve or the like in response to a signal from a conveyor program.

(Function) Since the shower rinsing device is integrated with the product conveyor, it is possible to immediately wash the product in the shower after lifting it from the designated treatment tank, and the product reacts with chemicals in the air and the surface It is possible to prevent the occurrence of defective defects.

At this time, since an enclosing hood is provided, it is possible to prevent the shower washing water from scattering, and the nitrogen oxide gas generated by the chemical reaction on the surface of the product to be treated can be absorbed into the shower washing water.

On the other hand, by immediately closing the upper lid on the treatment tank after the product to be treated rises, water that falls through the enclosure hood, etc., is allowed to flow through the upper lid and into the gutter, thereby preventing water from falling into the chemical solution. , does not affect the processing solution concentration.

(Example) Specific examples of the present invention will be described below based on the drawings, but as for specific means for carrying out the present invention, commonly used means will be selected as necessary, and the scope will be limited. It's not a thing.

A conveyor a (1) for conveying a product to be surface treated arbitrarily travels on the traveling rail (13).

The conveyor (1) is provided with an ascending/descending lift (2), a shower device (4), and a hood (3).

On the other hand, treatment tanks for surface treatment are arranged side by side on the lower side of the conveyor, and the - column shows a chemical polishing treatment tank (6) and a washing tank (7).

In the chemical polishing treatment tank, a chemical polishing solution was prepared with a ratio of 65% phosphorus M, 4% nitrate, the remainder, and water, and was heated to 100°C. The treated product (9) is held by a jig (8), degreased by a commonly used method, and chemically polished after treatment. The state is shown in FIG.

After chemical polishing for about 60 seconds, the processed product is raised by the lifting/lowering lift (2), and the upper lid (5) is immediately closed by the opening/closing device (11).

At the same time, the shower device (4) sprays water,
Clean chemicals adhering to processed products.

Even when the treated product rises, the high-temperature treatment liquid causes a reaction on the surface and generates gas, but the gas is absorbed by the shower water and a hood (3) is installed, so it is scattered along with the shower water to the surrounding area. is prevented.

After washing for several seconds, anodic oxidation was carried out as a post-process in a conventional manner.

Further, since the shower water is led to the washing tank (7) or the drain through the upper lid (5), it does not fall into the chemical polishing tank.

The product treated by the above method had no surface burn during chemical polishing and was in good condition.

〔Effect of the invention〕

In the present invention, the shower device and the conveyor operate as one unit, so aluminum products can be washed with water immediately after being treated with high-temperature chemicals, and defects caused by so-called surface burns caused by chemicals can be prevented. Moreover, the hood allows the chemicals to be removed from the aluminum products. A unique effect can be obtained in that gas scattering due to reaction with can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the state of shower flushing and washing, FIG. 2 is a schematic diagram of the surface treatment state by chemical treatment, and FIG. 3 is an example of the top lid opening/closing device. 1 ... Conveyor 2 ... Raising/lowering lift 3 ... Hood 4 ... Shower device 5 ... Top lid 6 ... Chemical polishing treatment tank 7 ... Washing tank 8 ... Processed products The hook is a jig 9...Processed product 10...Rubber hose 11...Top lid opening/closing device 12...Motor for lifting/lowering 13...Travel rail

Claims (1)

[Claims] In surface treatment equipment for aluminum or its alloys,
A surface treatment characterized by having a shower device for immediately rinsing a product to be treated with water after being lifted from a surface treatment chemical bath, and an openable top lid for preventing the rinsing water from falling into the treatment bath. Device.