JPH0734244B2 - How to clean the core block - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method of cleaning a core block, which enables good cleaning of the core block and has a good yield when a magnetic head core is manufactured.

(Prior Art) Conventionally, in manufacturing a magnetic head core, for example, a groove processing for winding is formed on ferrite or the like and a track groove processing and groove processing for winding are performed on a core block having a gap, and predetermined cleaning is performed. After removing the cutting debris and the like, the core block joined body was obtained by joining the core blocks with glass or the like as needed.

Conventionally, as a cleaning method, it is known that after performing predetermined track groove processing on a core block, ultrasonic cleaning is performed using ligroin, alcohol, pure water, dilute nitric acid, etc. Cutting debris left in the grooves and winding grooves was removed.

(Problems to be Solved by the Invention) However, in the conventional cleaning method, no matter which cleaning method is used, grinding debris, adhesive residue, abrasive debris, etc. are removed from the track groove and winding groove. There was a problem that the kimono could not be completely removed. As a result, if glass pouring is performed in this state for joining the core blocks, many bubbles will be generated in the glass part due to the deposits that could not be removed and remained in the groove part, and it could not be used as a magnetic head core. ,
There was a problem that the yield was reduced.

The object of the present invention is to solve the above-mentioned problems, and to improve the yield when manufacturing magnetic head cores, capable of satisfactorily removing the deposits from the groove of the core block, hardly generating bubbles in the glass. It is intended to provide a method of cleaning a block. (Means for Solving the Problem) A method for cleaning a core block according to the present invention is performed by performing track groove processing on a core block, then cleaning in the presence of alkali metal ions and chlorine ions, and then cleaning with pure water. It is characterized by doing.

(Operation) In the above-mentioned configuration, the groove is washed in the presence of alkali metal ions and chlorine ions, preferably 5 to 20% NaCl.
If ultrasonic cleaning is performed using a solution or a 5-20% KCl solution, it is possible to almost completely remove deposits from the groove, and it does not erode the gap glass and adversely affects the glass used for bonding. It is due to the fact that there is nothing.

(Embodiment) FIG. 1 is a flowchart showing a series of steps in a method of manufacturing a magnetic head core using the cleaning method of the present invention. In FIG. 1, first, a core block in which a groove for winding is formed and a gap is formed in ferrite or the like is prepared, and a predetermined track groove is formed in the prepared core block. Next, cutting debris, adhesive residue, abrasive debris, and other deposits generated during grooving are removed by washing.

At this time, when the cleaning method of the present invention, that is, ultrasonic cleaning in the presence of alkali metal ions and chlorine ions, is performed, it is possible to satisfactorily remove deposits from fine grooves of, for example, about 100 μm as compared with the conventional method. You can The solution containing both alkali metal ions and chloride ions used as a cleaning solution is a 5-20% NaCl solution or 5-20%.
% KCl solution is preferable because it can be completely carried out by removing deposits and does not corrode the gap glass and does not adversely affect the glass used in the subsequent step. Then, it is further washed with pure water to be cleaned and then dried to obtain a predetermined core block. Finally, the core blocks are joined by pouring glass to produce a core block joined body.

Hereinafter, an actual example will be described.

Example As a cleaning solution, a NaCl solution and a KCl solution whose concentrations were changed from 3% to 25% were used, and CuC was used as a comparative example.
l ₂ solution is used to ultrasonically clean the core block after grooving with a ligroin cleaning solution to remove deposits, and then to investigate the erosion of the gap glass and the generation of bubbles in the glass portion of the track groove. Was comprehensively determined. The results are shown in Table 1. In Table 1, ◯ is good, Δ is normal, and × in the degree of removal of adhered substances and overall judgment.
Indicates a defect.

From the results shown in Table 1, a solution containing alkali metal ions and chlorine ions as the cleaning solution of the present invention, in which a solution using NaCl and KCl is used, softens the static electricity and removes the polishing debris and the like adhering electrostatically to the core block. It was found that good cleaning can be achieved, glass is not eroded, and the glass has good wettability, which is the most suitable method for cleaning the core block. In addition, Cu used as a comparative example
It was found that the Cl ₂ solution was not suitable for cleaning the core block because it eroded the gap glass although it had good cleaning ability. The concentrations of the solutions are NaCl and KC.
It was found that both of the values of l were 5% to 25%.

In addition to the conventional method using ligroin as a cleaning solution,
By the method of the present invention using a% NaCl solution, a core block joined body is produced in the same manner as in the above-mentioned Examples,
The number of bubbles of 31 μm or more generated in the track glass
An average of 70 samples for each core block conjugate was determined by measuring in the field of view of a microscope of 100 times. The results are shown in Table 2.

From the results in Table 2 as well, according to the cleaning method of the present invention, good cleaning results are obtained, and when a core block joined body is obtained using the core block that has undergone this cleaning, a magnetic head core can be manufactured with good yield. all right.

(Effects of the Invention) As is clear from the above description, according to the core block cleaning method of the present invention, by performing ultrasonic cleaning on the core block after the groove processing in the presence of alkali metal ions and chlorine ions, Since it is possible to almost completely remove the deposits from the groove portion and there is no erosion of the gap glass and it does not adversely affect the glass used in the subsequent step, if a core block joined body is produced using the washed core block, A magnetic head core can be obtained with good yield.

[Brief description of drawings]

FIG. 1 is a flowchart showing an example of a method for manufacturing a core block assembly using the cleaning method of the present invention.

Claims (1)

[Claims] 1. A method for cleaning a core block, which comprises grooving the core block, cleaning the core block in the presence of alkali metal ions and chlorine ions, and then cleaning with pure water.