JPS58189399A - Chemical treatment of metallic surface - Google Patents

Abstract

PURPOSE:To perform multiple stages of chemical treatment on metallic surface continuously without retransferring the work, by supplying the treating solns. for the respective stages successively into a treatment chamber which contains the work or is constituted by using a part of the work. CONSTITUTION:A cylinder 1 is set as shown in the figure, and selector valves 13a and 15a are opened; at the same time, a pump 14a is operated to circulate the degreasing liquid in a degreasing liquid tank 10 to a supply passage 7 a treatment chamber 4 a return passage 8 a tank 10. Thus, the inside surface of the cylinder 1 is degreased with the degreasing liquid in the chamber 4. The treating liquid in the chamber 4 is returned to the inside of the tank 10 upon ending of the degreasing, whereafter air is fed to the chamber 4 to dry the chamber and the valves 13a, 15a are closed, then the valves 13b, 15b are opened and a pump 14b is operated. The dilute degreasing liquid is circulated between the chamber 4 and a tank 11 and the degreasing liquid stuck on the inside surface of the cylinder 1 is diluted and removed. The chamber 4 is dried by air. Thereafter, the water in the tank 12 is circulated between the chamber 4 and the tank 12 to rinse the inside surface of the cylinder 1; thereafter, the work is dried by the air.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of chemically treating metal surfaces such as plating.
We perform multiple steps in the order of post-treatment, and pre-treatment alone requires multiple steps such as degreasing, alkaline etching, pickling, etc. Furthermore, even if we look only at degreasing,
It is necessary to perform multiple steps such as soaking the work in a degreasing liquid to substantially degrease the work, cleaning the work with a diluted degreasing liquid to recover the degreasing liquid adhering to the work, and rinsing with water.

In the past, processing liquid tanks were placed in parallel for each process in the factory.
Workpieces are continuously processed by transferring them to each processing tank in order of process and immersing them. However, in this conventional method, the next conveyance device that transfers the workpieces is extremely complicated, and it requires a large number of processing steps. Tanks [There is a problem that requires a huge amount of space in the factory because they are placed side by side in the factory.

The present invention was developed based on these circumstances, and its purpose is to provide a chemical treatment for metal surfaces that does not require a secondary transport device to move the workpiece and does not require a large space within the factory. It is intended to provide a method.

That is, the present invention is constructed by storing a workpiece or using a part of the workpiece, and the processing solution for each process is sequentially exchanged and supplied into the processing chamber, and there is no need to transfer the workpiece. First, an embodiment of the present invention, which is characterized by continuous multi-step processing by exchanging the processing liquid supplied into the processing chamber, will be explained based on the drawings. Fig. 1 shows the inner surface of an aluminum alloy cylinder of an engine. Chrome plated? The following shows the process for applying it. This embodiment will be described with reference to a case in which at least three peeling steps are carried out consecutively, and FIG. 2 is a schematic diagram. In FIG. 2, 1 is a cylinder of the engine, and both ends are closed by insulating sealing materials 2&, Jbk, and closing bodies 3a, Jb. The next space surrounded by 3b constitutes four processing chambers. An electrode 5 is provided in the processing chamber 4 as necessary,
An electric current is connected between the electrode 5 and the cylinder 1.

A supply passage 1 is connected to one of the closing bodies 3 so as to communicate with the processing chamber 4, and a return passage 8 is connected to the other closing body 3b so as to communicate with the processing chamber 4.

10 is a degreasing liquid tank, which contains degreasing liquid such as soda carbonate and caustic soda. The diluted degreasing liquid is supplied to the degreasing tank 10 to replenish it when the degreasing liquid in the degreasing tank 12 becomes low. Each of the supply passages 1 and 13, which contain water, is used for switching pulp 13IL.

13b, 13c Circulation pump 1 d&, 14b
.

The OUT return passage 8 connected to each of the tanks 10, 11 and 12 through 14 cf is connected to the switching pulp 11, respectively.
5@, Jlb, each tank 10.11 above through 15cf
and 12.

For such a structure, set the degreasing process as shown in the figure.
Activate pump 14& with & and 15&fq<. Then, the degreasing liquid in the degreasing liquid tank 10 flows through the supply passage r→
Processing W14 → return passage.

It is circulated from 8 to tank 10. The inner surface of the cylinder 1 is then subjected to a degreasing treatment using the degreasing liquid in the processing chamber 4. In this case, since the degreasing liquid is circulated through the T-pump 10, fresh processing liquid is always in contact with the workpiece, and the degreasing time is shortened.
Moreover, the capacity of the tank 10 is also small. When the degreasing process is completed, the processing liquid in the processing chamber 4 is returned to the tank 10, and then air is sent to the processing chamber 4 for drying, and then the pulp 13*,
15@p is closed, then pulps 13b and 15bk are opened and pump 14b'i is operated. Then, the diluted degreasing liquid in the cleaning tank 11 is processed i! Since the degreasing liquid is circulated between the cylinder 4 and the tank 11, the degreasing liquid adhering to the inner surface of the cylinder 1 is diluted and removed. After this treatment, air is applied to the treatment chamber 4.
Dry.

Next, pulp 13b and 15b'ff are closed, and pulp 13
c, J5C'l (open and operate the pump 14a. Since the water in the tank 12 is circulated between the processing chamber 4 and the tank 12, the inner surface of the cylinder 1 will be washed away with water. When the work is finished, the workpiece [
Dry it in this way.
: Can be performed continuously 0 In this case, there is no need to transfer the cylinder 1 as a workpiece, and simply transfer each tank 1.
It is only necessary to switch the supply of liquid in 0, 11, 12.

Therefore, a conveying device for the cylinder 1 is not necessary. Next, since each processing liquid is circulated by a pump, the processing time required for one process is shortened, and the evening/day time is 10.1
1.12 capacity is small and the space for installing the tank is also small.

In addition,#! The example in Figure 2 describes the case where the process A in Figure 1 is continuously processed, but w, Be in Figure 1
It is possible to perform all processes, and if necessary, if there is a processing liquid tank and piping structure for each process, the number of processes can be limited. Needless to say, it is used for electrolytic pickling, zinc replacement, and raw meat treatment.

Of course, the present invention is not limited to the treatment of the inner surface of an engine cylinder.
It is not limited to the example in which it is a part of the processing chamber.

As detailed above, the method of the present invention works? In a processing chamber configured using a part of the workpiece, the processing solution corresponding to each process is changed sequentially and supplied, so there is no need to transport the workpiece, and the transport device is omitted. [Since the tank to accommodate it only needs to be small, it does not take up a large amount of space in the factory.

[Brief explanation of the drawing]

FIG. 1 is a process explanatory diagram for chemically treating the inner surface of an engine cylinder, and FIG. 2 is a schematic diagram illustrating an embodiment of the method of the present invention. 1...Cylinder (work), 4...Processing chamber, r...
・Supply passage, 8...Return passage, 10.11.12...
・Tank, 13h, 13b, 13e...switching valve,
14 a jl 4 b, 14 c =-pump,
J 5JL 515b, 15e...Switching valve. Ro Ganjin's agent Patent attorney Suzue Takehiko Figure 1 Figure 211!

Claims (1)

[Claims] A workpiece [accommodated or constructed using a part of a workpiece] is placed in a specific processing chamber for subsequent processing according to each step (multi-step chemical processing). [Featured chemical treatment method for metal surfaces 0]