JPS6254398B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a method for attaching a workpiece to the upper part of an apparatus main body in a fluid-tight manner and extending upwardly within the main body to supply a processing liquid to the internal space of the workpiece. Relating to a processing liquid using processing device of the type having a processing liquid circulation path provided with a processing liquid supply passage and a processing liquid discharge passage extending downward from the upper part of the main body and discharging the processing liquid from the internal space of the workpiece, and In particular, in order to perform plating on the internal wall surfaces of internal combustion engine cylinders, etc., the installation process → alkaline degreasing process → water washing process → acid etching process → water washing process → acid etching process → water washing process → plating process → water washing process → removal process This invention relates to a processing device using a processing liquid, such as an automatic continuous plating device, which has a series of processing steps.

BACKGROUND TECHNOLOGY In general, in the above-mentioned apparatus, a workpiece is mounted in a liquid-tight manner on the upper part of the apparatus, and the internal space in which the workpiece is to be processed is connected to a processing liquid supply passage and a processing liquid discharge passage of a processing liquid circulation path of the apparatus. The processing liquid is circulated through the internal space of the workpiece for a predetermined period of time to process the workpiece, and then the circulation operation of the processing liquid is stopped and the processing liquid inside the internal space of the workpiece is circulated through the circulation path. However, unless the internal space of the workpiece is communicated with the atmosphere, the processing liquid will not easily flow out from the internal space of the workpiece. In particular, in the plating pretreatment process in plating equipment, etc., the pretreatment liquid in the workpiece must be quickly removed as soon as the plating pretreatment of the workpiece is completed, and the process must proceed to the water washing process in the next process. The processing time becomes excessive and various problems arise in terms of process control, such as poor adhesion of the plated layer. For this reason, conventionally, a compressed air operated valve device is attached to a hole formed in a workpiece, for example, if the workpiece is a cylinder of an internal combustion engine, a spark plug installation hole that communicates with the internal space of the cylinder. Compressed air was supplied to the cylinder to open the valve, allowing the internal space of the workpiece to communicate with the atmosphere and removing the processing liquid inside the cylinder.

Problems to be Solved by the Invention In the conventional apparatus as described above, a valve device must be prepared for each workpiece, and a valve device must be attached to each workpiece, which reduces work efficiency. This is bad and hinders work automation. In addition, the valve device itself must be made of corrosion-resistant material and has a complicated structure, making it expensive and prone to failure. In other words, since the valve of the valve device is designed to come into contact with the processing liquid, there is a risk that the valve device may corrode and malfunction, or that the processing liquid may spray out from the valve device due to corrosion of the seal. Furthermore, it was very inconvenient to move the workpiece with the compressed air hose for operating the valve device still attached.

The present invention has been made to solve the problems of conventional devices as described above.

Means for Solving the Problems Therefore, the present invention provides a processing apparatus using a processing liquid of the type described above, in which a ventilation passage that can communicate with the atmosphere via a shutoff valve is connected to a processing liquid supply passage and a processing liquid discharge passage of the apparatus main body. It is characterized by being connected to at least one of the following.

Function When processing the internal space of the workpiece, first close the shutoff valve of the ventilation passage, then operate the processing liquid circulation device to forcefully send the pressurized processing liquid upward in the processing liquid supply passage. The internal space of the workpiece is filled with a processing liquid. The processing liquid is discharged into the liquid reservoir through the processing liquid discharge passage while carrying out predetermined processing on the workpiece in the internal space of the workpiece, and the processing liquid is circulated at high speed until the processing is completed. After processing the workpiece for a predetermined period of time, the operation of the processing liquid circulation device is stopped and the cutoff valve is opened. As a result, air in the atmosphere enters the processing liquid circulation path from the shutoff valve through the ventilation path, and further flows into the internal space of the workpiece, and the processing liquid is transferred to the internal space of the workpiece, the processing liquid supply path, and discharged. Rapidly fall down the aisle and be ejected.

Embodiment The illustrated embodiment is an example in which the present invention is applied to an automatic plating device for plating the inner wall of a cylinder of an internal combustion engine. A fixing jig 2 is disposed in a main body 1 of the apparatus, and a movable jig 3 is disposed above it. A vertical cylinder mounting reference hole 4 is formed in the movable jig 3, and a mounting flange portion 14 of a cylinder 5 as a workpiece is inserted into this cylinder mounting reference hole 4.
The movable jig 3, which is fixed by the workpiece fixing cylinder 21, and the cylinder 5 are sealed in a liquid-tight manner by an appropriate sealing means, and an ignition valve communicating with the internal space 6 of the cylinder 5 is provided. The plug attachment hole 7 is closed in advance with a plug 8 made of a suitable synthetic resin. In addition, the intake hole 15 and exhaust hole 16 of the cylinder 5
is a blind plug 1 that moves forward and backward with air cylinders 17 and 18.
It is sealed at 9.20.

The fixed jig 2 is provided with a processing liquid supply passage 9 that extends vertically upward and also serves as an anode in the plating process, and its upper end passes through the cylinder mounting reference hole 4 of the movable jig 3 into the interior of the cylinder 5. It protrudes into the space 6 and supplies processing liquid (in this case plating liquid) pumped by a pump (not shown) to the internal space 6 of the cylinder 5 from below.
A coaxial annular passage 10 is provided at the upper end of the fixed jig 2 and communicates with the cylinder mounting reference hole 4 of the movable jig 3.
is formed, and this annular passage 10 communicates with a passage 11 extending vertically downward within the fixing jig 2, and is connected to the cylinder mounting reference hole 4 of the movable jig 3 and the annular passage 10 of the fixing jig 2. The passage 11 constitutes a processing liquid discharge passage for returning the processing liquid from the internal space 6 of the cylinder 5 to a liquid reservoir (not shown). One end of the fixing jig 2 is open to the passage 11, and the other end is provided with a shutoff valve 1.
A ventilation pipe 12 provided with 3 is fixed. The shutoff valve 13 is a solenoid valve in this case, and is normally closed, but opens when electrically energized to communicate the inside of the vent pipe 12 with the atmosphere.

During the plating process, the shutoff valve 13 is deenergized and closed, and if the ventilation pipe 12 is properly provided, air is trapped in the pipe 12, so that the processing liquid does not flow up to the valve 13, and the valve is closed. 13 is suitable for protection. After a predetermined processing time, if the operation of the processing liquid pressure pump to the processing liquid supply passage 9 is stopped and the cutoff valve 13 is opened at the same time, the atmosphere flows into the vent pipe 12 through the cutoff valve 13 and the internal space 6 and The processing liquid in the processing liquid supply passage and the processing liquid discharge passage is rapidly dropped and removed therefrom. At this time, no processing liquid flows into the vent pipe 12 at all. Experiments have shown that even if the length of the ventilation pipe 12 is quite short, there is no problem in operation.

The movable jig 3, with the cylinder 5 still attached, is moved to a fixed jig (not shown) for the next process in the apparatus, where the interior space 6 of the cylinder 5 is treated with the treatment liquid in the same manner, and finally Then, the cylinder 5 is removed from the movable jig 3, and each plug 8, 19, 20 is removed from the cylinder. On the other hand, another movable jig with another cylinder attached to the fixed jig 2 moves, and the above-described operation is repeated. Incidentally, among the processing steps of the automatic plating apparatus, the alkaline degreasing step, acid etching step, zinc substitution step, and each water washing step are performed in exactly the same manner as in the illustrated embodiment. Further, in the plating process, the negative side of the DC voltage is connected to the tip of the workpiece fixing cylinder 21, and the positive side is connected to the processing liquid passage 9, respectively, and the plating is accurately electrodeposited to a predetermined thickness. The flow path for the plating liquid in the plating process, the arrangement of the shutoff valve 13, etc. are completely the same as in the illustrated embodiment.

Effects of the Invention By providing a ventilation valve device for discharging the processing liquid in a part of the main body of the apparatus, the automation of the apparatus can be further promoted, and there is no malfunction or failure of the apparatus, and there is no liquid leakage. Since the liquid can be quickly, accurately and completely drained from the workpiece, it is very advantageous in terms of process control.

[Brief explanation of the drawing]

The drawing is a cut away longitudinal sectional view of an embodiment of the invention. DESCRIPTION OF SYMBOLS 1... Main body, 2... Fixed jig, 3... Movable jig, 4... Hole, 5... Cylinder, 6... Internal space, 9... Processing liquid supply passage, 10... Annular passage,
11...Passway, 12...Vent pipe, 13...Shutoff valve.

Claims (1)

[Claims] 1. A workpiece is attached to the upper part of the apparatus main body in a liquid-tight manner, and a processing liquid supply passage extends upward in the main body to supply the processing liquid to the internal space of the workpiece, and a processing liquid supply passage extends downward from the upper part of the main body to supply the processing liquid to the internal space of the workpiece. In a type of processing liquid processing equipment that has a processing liquid circulation path that is provided with a processing liquid discharge passage that discharges the processing liquid from the internal space of the workpiece, the processing liquid is supplied through a ventilation path that can communicate with the atmosphere via a shutoff valve. A processing device using processing liquid, characterized in that it is connected to at least one of a passage and a processing liquid discharge passage.