JPS63274484A - Precision washing method of composite part - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] When cleaning composite parts, cleaning of organic stains, drying, cleaning of inorganic stains, cleaning with a detergent for inorganic stains, water displacement treatment, and finishing can be performed reliably. This enables precision cleaning without damaging the parts.

[Industrial application field]

A magnetic head assembly for a magnetic disk device used as an external storage device in an information processing system consists of a slider made of ferrite, a recording/reproducing core wrapped around a coil, and a gimbal made of stainless steel or the like. The gimbal is laser welded to the spring arm. The present invention relates to a method of making it possible to reliably clean the entire composite part made up of a plurality of members made of different materials.

[Composition of composite parts]

FIG. 3 shows a magnetic head assembly called the Watrous type, in which (a) is a front view seen from the magnetic disk side;
(a) is a cross-sectional view taken along line bb in Fig. (a), and (C) is a rear view. Reference numeral 1 denotes a core of a magnetic head, around which a coil 2 is wound and attached to a core slider 3. The gimbal 4 is formed by etching a thin sheet-like plate into an E shape, and the slider 3 is bonded to the central tongue piece 5 of the E shape, and the spring arms 41 and 42 on both sides are connected to the spring arm 6. That is, the gimbal 4 and the spring arm 6
Laser welded and joined together at the points marked.

FIG. 4 shows a fixing structure between the core slider 3 and the gimbal 4, in which (a) is a plan view, (a) is a front view, and (C) is a right side view. A dowel 7 is formed on the central tongue piece 5 of the gimbal 4, and the inner surface of the central tongue piece and the bottom surface of the back groove 8 of the core slider 3 are fixed with adhesive.

Further, the corner portions formed by the side surfaces on both sides of the core slider 3 and the central tongue piece 5 are joined with an adhesive 9.10.

To perform such bonding, adhesive is applied in advance between the inner surface of the center tongue piece 5 having the dowel 7 and the bottom surface of the back groove of the core slider 3, and then the center tongue piece 5 and the center tongue piece 5 are bonded together using an assembly jig. It is aligned with the core slider 3 and placed in a furnace together with the jig to be heated and dried. While temporarily fixed to the central tongue piece 5 in this manner, adhesives 9 and 10 are applied to the corners between the central tongue piece 5 and both side walls of the core slider 3 and hardened to permanently fix the core slider.

[Conventional technology]

As described above, the magnetic head assembly has a complicated structure in which members made of various materials such as ferrite, tesunless, and coil are assembled by bonding or welding. Dust tends to adhere to this magnetic head rad assembly during the manufacturing process, but if dust adheres to it, when it is installed in a magnetic disk drive and recorded/played, the dust may fall due to vibration or wind pressure and land on the magnetic disk surface. If the dust adheres to the slider, the dust may become trapped between the magnetic disk surface and the slider, potentially damaging the magnetic disk surface or causing a head crash. Therefore, before incorporating the magnetic head assembly into a device, it is necessary to clean it to ensure that dust and dirt are removed.

FIG. 5 is a process diagram showing a conventional method of cleaning a magnetic head assembly. First, the magnetic head rad assembly is placed in an ultrasonic cleaning tank and subjected to ultrasonic cleaning. At this time, 37~
It is heated to 38°C, so put it in the next hot tub for 30'
After reducing the temperature to about C, it is placed in a Freon steam chamber. 30
When Freon vapor comes into contact with a magnetic head assembly at a temperature of approximately .degree. C., it condenses and Freon water droplets adhere, accumulate, and drip. At this time, dust and dirt adhering to the magnetic head assembly are also dropped and washed away.

Some stains cannot be removed with the above cleaning alone, so a cotton swab is moistened with water and wiped off.In this case, water, alcohol, thinner, etc. are used to wipe the area manually.

[Problem that the invention seeks to solve]

However, if composite parts with complex structures such as magnetic head assemblies are cleaned using this method, precision parts may be deformed or damaged during wiping, resulting in a decrease in yield. Further, it is difficult to remove dust that has entered the narrow gap. Since the optimal cleaning liquid and cleaning method differ depending on the material and shape of the parts that make up the composite part, conventional cleaning methods are insufficient and do not provide the expected effects.

A technical object of the present invention is to solve these problems in the conventional method for cleaning composite parts, and to enable cleaning of composite parts to be performed reliably and without damaging the parts.

[Means for solving problems]

FIG. 1 is a process diagram illustrating the basic principle of the precision cleaning method for composite parts according to the present invention. (2) is a step of removing organic dirt; (2) is a step of removing and drying the solvent attached in the organic matter removal step; (2) is a step of removing inorganic dirt;
■ is a cleaning process to prevent detergents etc. attached during the inorganic matter removal process from being brought into the next process, ■ is a water replacement process to remove the water used in the ■ process, and ■ is quick drying for final finishing. It is a process.

The present invention provides composite parts with I, II, and III processes.
, IV, ■, and ■ in this order to perform cleaning.

[Effect]

In step (2), organic stains are intensively cleaned using a solvent suitable for cleaning organic stains such as IPA. Then, in step (2), the solvent used in the organic stain removal process is dried and removed to prevent organic stains from being brought into step (2). In the step (2), inorganic stains are cleaned using a detergent suitable for cleaning inorganic stains. In other words, inorganic stains that could not be cleaned in step I are intensively cleaned. By going through the above steps, both organic and inorganic stains are removed, resulting in a clean composite part.

In step (2), inorganic detergent is washed to prevent the detergent used in step (2) from being brought into subsequent steps. Next, in step V, the washing water in step ① is removed, and finally, in step ③, rapid drying is performed to ensure that no dry stains remain. There's nothing left.

〔Example〕

Next, examples will be used to explain how the method for precision cleaning of composite parts according to the present invention is actually implemented. FIG. 2 is a process diagram showing an embodiment of the method of the present invention. Organic stain removal step I consists of 11 to 12 steps. 11.1
In both cases, composite parts such as the magnetic head assembly are immersed in a Freon TP35 liquid bath to which ultrasonic waves are applied, and the composite parts are ultrasonically cleaned. are intensively cleaned. The composite parts to be cleaned are hung on a jig or placed in a basket.
Immersed in a liquid bath. Note that Freon TP35 refers to a liquid containing 35% isoproalcohol (IPA) and the remaining 65% Freon. IPA has a strong cleaning effect on organic stains.

In step Ⅰ of removing the solvent in step I, Freon T
After ultrasonic cleaning using F, drying is performed by pulling up. In the above steps, the organic stain and the solvent used for cleaning the organic stain are removed.

The inorganic stain cleaning process■ removes inorganic stains,
The composite parts are also ultrasonically cleaned by immersing them in a cleaning solution containing a neutral surfactant that has no effect on the object to be cleaned. As a result, water-soluble stains such as water stains, that is, inorganic stains, are mainly cleaned.

Since this detergent contains various activators, in the next detergent washing step (1), the detergent is washed away with a shower using pure water, and this shower step is passed through 2 to 3 times.

By showering with pure water many times in this manner, detergents and the like are not brought into the subsequent process, and the cleanliness of the solvent in the subsequent process is maintained.

Note that in steps I to (2), it is effective to raise the temperature to about 30 to 45 degrees.

Next, in order to effectively remove the moisture deposited in the shower step, water replacement is performed in step V. First, in steps 18 and 19, the material is shaken in the Freon TF, and when it is pulled up, a Freon liquid is sprayed to blow off the moisture. Still, moisture remains in the tiny gaps, so step 20.21
In step 1, the sample is immersed in a Freon TP35 liquid bath containing IPA and subjected to ultrasonic cleaning to combine with moisture and remove the moisture. Since IPA easily binds to water, it is effective in removing moisture that has entered narrow gaps. Furthermore, before ultrasonic cleaning,
Spraying Freon TF removes most of the water, so it is possible to prevent the Freon TP35 liquid in the ultrasonic cleaning tank from being diluted with water, and the solvent lasts a long time.

In steps 18 and 19, Freon TE is used instead of Freon TF.
may be used. Since Freon TE contains ethanol, it has a strong water removal effect, but it is difficult to handle because it is flammable.

Although IPA has excellent effects as mentioned above, it is highly flammable and dangerous, so Freon is mixed in to make it non-flammable and easy to handle.

Finally, in the finishing step (2), cleaning is performed with Freon TF. That is, in step 22, ultrasonic cleaning is performed in a Freon TF liquid bath, and then in step 23, cleaning is performed in a Freon TF shower. Freon TF has a short drying time and leaves no dry stains, making it suitable for finishing. In addition, in the finishing process ■,
Raise the temperature a little to make it easier to dry.

Because a solvent containing IPA is used in the previous process, IPA adheres to the composite parts. This IPA is Freon TF
If the liquid is mixed with other liquids, the drying of the entire liquid will be slowed down, making it easier for dry stains to form. Therefore, IPA mixed in this TF
In order to remove this, an IPA removal machine is installed. This is to wash the liquid in the tank in step 22.23 with water, and when water is added, the water tends to bind to the IP, so the water
Since PA is removed and water and Freon TF do not dissolve,
Freon TF with high purity is obtained and rapid drying is possible.

〔Effect of the invention〕

As described above, according to the present invention, manual wiping work is not required, so there is no risk of damaging precision parts, product yield is improved, and full automation is possible, making it extremely efficient and suitable for mass production. ing. Organic stains and inorganic stains are cleaned in separate processes using special solvents, so all stains can be reliably removed, and since there is a solvent cleaning process between each cleaning process, cleaning becomes easier. Reliable and precise cleaning is possible, and the solvent has a long service life (the same solvent can be used repeatedly).

[Brief explanation of drawings]

Fig. 1 is a diagram explaining the basic principle of the precision cleaning method for composite parts according to the present invention, Fig. 2 is a process diagram showing an embodiment of the method of the present invention, and Fig. 3 is a diagram showing a magnetic head assembly as an example of the composite part. 4 are diagrams showing a gimbal fixing structure in the same magnetic head rad assembly, and FIG. 5 is a process diagram showing a conventional cleaning method. In the figure, ■ is an organic stain removal process, ■ is a drying process, ■ is an inorganic stain removal process, ■ is a detergent cleaning process,
■ indicates the water displacement process, and ■ indicates the finishing process. Patent applicant Yasushi Fukushima, sub-agent of Fujitsu Limited, patent attorney. Figure 4

Claims (1)

[Claims] When cleaning a composite part made up of a plurality of members made of different materials, there is a step I for cleaning organic stains, a step II for removing and drying the solvent used in the cleaning process for organic stains, and a step II for cleaning inorganic stains. Process III to wash the inorganic stains, Process IV to wash the detergent so that the detergent used to clean the inorganic stains does not carry over to the next process, Water replacement process V to remove water, and Finishing process VI to quickly dry. A precision cleaning method for composite parts characterized by: