JPH04259388A - Method for washing precision parts or jigs and tools - Google Patents

Abstract

PURPOSE:To provide the washing method which attains a sufficient rinse effect in spite of a drastic decrease in the volume of the rinse water to be used, eventually reduces the sizes of various kinds of the equipments necessary for water rinsing, and can reduce running costs as well in the method for washing precision parts or jigs and tools including a stage for rinsing by using the water. CONSTITUTION:The water for rinsing is so fined that the average particle diameter thereof attains 1mum to 5mm. This water for rinsing is supplied to the materials to be washed, subjected to washing with a washing liquid prior to rinsing, in such a manner that the volume of the water is 1 to 300 times the volume of the washing liquid sticking to these materials to be washed.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides a method for cleaning precision parts or jigs and tools used in their assembly process. Specifically, the present invention provides a method for cleaning precision parts or jigs and tools used in their assembly process. The present invention relates to a cleaning method including a rinsing step.

0002

[Prior art and problems to be solved by the invention] Conventionally,
Hydrocarbons such as kerosene, benzene, and xylene can be used to remove organic dirt such as oil, machine oil, cutting oil, grease, liquid crystal, and rosin flux that exist on the solid surfaces of precision parts and jigs. Solvent-based cleaning agents such as chlorine-based solvents such as trichlorethylene and tetrachlorethylene; and fluorocarbon-based solvents such as trichlorotrifluoroethane have been used.

[0003] However, it has been revealed that cleaning agents that use chlorine-based and fluorocarbon-based solvents have major problems in terms of safety, toxicity, environmental pollution, etc., and their abolition is being promoted at the international level. There is. In addition, hydrocarbon solvents, especially benzene and xylene, are highly toxic compounds and are designated as hazardous substances under the Industrial Safety and Health Act. Because of the problems that it is undesirable to use it as a cleaning agent, the use of water-based cleaning agents or cleaning agents that can be rinsed with water is being considered for cleaning stains on precision parts, jigs, and tools. By appropriately selecting and blending surfactants, builders, etc. used in the cleaning agent, these cleaning agents have cleaning properties equivalent to or better than solvent-based cleaning agents, or because they do not have a flash point, there is no risk of fire or explosion. However, on the other hand, if cleaning components remain on precision parts, jigs, etc., they may cause deterioration of electrical properties such as electrical insulation, corrosion of metals, or swelling of plastic parts. have a problem Therefore, the residual detergent components must be removed by thorough rinsing with water or the like, and the equipment and running costs required for this are quite large. When rinsing with water is considered, equipment for producing and storing ion-exchanged water, pure water, etc. necessary for rinsing, equipment for heating and cooling to control water temperature, and equipment for supplying rinsing liquid during rinsing. Alternatively, wastewater treatment equipment such as activated sludge and activated carbon treatment is required to treat used rinsing liquid, and operating these equipment requires continuous use of utilities, chemicals, and labor costs. becomes.

[0004] Furthermore, various cleaning methods have been proposed and some have been implemented in order to suppress the cost increase associated with rinsing with water, but these methods are not necessarily sufficient. In other words, conventional rinsing methods using water can be broadly classified into two methods: one is a method in which the object to be cleaned is immersed in a rinsing liquid, and the other is a method in which the object to be cleaned is immersed in a rinsing liquid. This is a method in which the liquid is discharged onto the object to be cleaned in discontinuous or continuous liquid form. In actual rinsing operations, these methods are used alone or in combination. However, the amount of detergent liquid remaining on the object to be cleaned depends on the shape of the object to be cleaned, but in general, it is significantly smaller than the amount of detergent that accumulates on the object, and this is especially noticeable when the object has been treated with air blowing etc. after cleaning. For,
If the amount of water used for rinsing is 1 to 300 times the amount of cleaning liquid attached to the object to be cleaned, the rinsing method by immersion will not be able to sufficiently immerse the object to be cleaned, and the method of discharging rinsing water will not be able to rinse the object sufficiently. If the rinse water is too large, it cannot be sprayed uniformly onto the object to be cleaned, and because a large amount of rinsing water is supplied per unit time, the rinsing water often runs off the object without achieving a sufficient rinsing effect. No effect is obtained.

[0005] Therefore, an object of the present invention is to provide a method for cleaning precision parts or jigs and tools that includes a rinsing process using water, and to achieve a sufficient rinsing effect even when the amount of rinsing water used is significantly reduced. It is an object of the present invention to provide a cleaning method that can make various equipment necessary for water rinsing compact and reduce running costs.

[0006]

[Means for Solving the Problems] As a result of intensive research in order to solve the above problems, the present inventors have devised a method to remove objects to be cleaned, such as precision parts and jigs and tools, to which cleaning liquid has adhered after cleaning, by washing them with water. When rinsing, finely chop the rinsing water so that the average particle size is 1 μ to 5 mm, and sprinkle or spray it on the object to be cleaned in an amount equivalent to 1.0 to 300 times the amount of cleaning liquid attached to the object to be cleaned. It has been found that when water is supplied, adhering cleaning liquid can be efficiently rinsed with a small amount of water.

The present invention has been made based on the above findings, and consists of finely rinsing water (hereinafter referred to as "rinsing") so that the average particle size is 1 μ to 5 mm, and of water is applied to the object that has been cleaned with the cleaning liquid prior to rinsing, and the amount of water that has been applied to the object is equal to
The purpose of the present invention is to provide a method for cleaning precision parts or jigs and tools used in the assembly process thereof, which are supplied 300 times more.

[0008] The method for cleaning precision parts or jigs and tools of the present invention will be explained below based on experimental aspects thereof.

[0009] To carry out the method of the present invention, prior to rinsing, the cleaning liquid is supplied to the object to be cleaned in an amount of 1 to 300 times the amount of cleaning liquid adhering to the object to be cleaned. At this time, water for rinsing (rinsing water) is supplied after being finely divided to have the above-mentioned average particle diameter. The amount of water used for rinsing is 1 to 30 times the amount of cleaning solution remaining on the object to be cleaned.
0 times the amount is required, less than 1 times the amount of rinsing water is too small and the rinsing performance is insufficient, and more than 300 times the amount generates a large amount of rinsing liquid, reducing the effect of reducing wastewater load, etc. . As a method of supplying rinsing water, for example,
Methods include spraying from a nozzle under high pressure, using an ultrasonic oscillator, or spraying using centrifugal force. By using these methods, the rinse water can be made to have an average particle size of 1 μ to 5 mm. It can be miniaturized and supplied. If the average particle diameter of the rinse is 1 μm or less, the required rinsing time becomes too long to be practical, and if it is 5 mm or more, the rinsing efficiency per unit of rinsing water decreases. The average particle diameter of the rinsing water is preferably 10μ to 3mm, and the amount of the rinsing water is 5 to 10 times the amount of the remaining cleaning solution.
0 times the amount is preferred.

[0010] When rinsing, it is preferable to place the object to be cleaned in such a state that the rinsing liquid can quickly flow down the object.

[0011] The temperature of the rinsing water in the cleaning method of the present invention is not particularly limited, but is generally between 25 and 80°C.
Used in the °C range.

The rinsing method of the present invention described above may be used alone or in succession. Further, it can also be used in combination with a conventional rinsing method such as a dipping method or a discharging method. These combinations should be considered in consideration of the cost and production speed required when rinsing a certain number of items to be cleaned. If you want to increase the production speed, first use the water of the present invention at the beginning of the rinsing process. It is preferable to use a system in which a rinsing process is performed using fine particles, in which most of the cleaning liquid on the object to be cleaned is removed, and a small amount of the remaining cleaning liquid is removed by dipping or discharging. This way, the amount of rinsing water used can be significantly reduced compared to conventional methods.
As a result, wastewater treatment costs can also be reduced. If you want to completely reduce the amount of rinsing water used and waste water even if you sacrifice some production speed, you can continuously perform the rinsing process using the water particles of the present invention depending on the required degree of rinsing of the object to be cleaned. That's fine.

[0013] Dirt components derived from the cleaning solution mixed into the waste water after rinsing, that is, dirt components such as oil, flux, and liquid crystal on the cleaning agent and the object to be cleaned, are removed by the coagulation sedimentation method or activated sludge method before drainage. Alternatively, it must be removed by activated carbon adsorption. In order to reduce the cost required for these wastewater treatments, in addition to reducing the amount of water used for rinsing, there is a method of suppressing the contamination of dirt components originating from the cleaning liquid into the wastewater. As described above, in the rinsing method of the present invention in which water particles are sprinkled or sprayed on the object to be cleaned, most of the cleaning liquid on the object to be cleaned can be removed with a small amount of rinsing water, so the waste water generated in this process after using the rinse By installing dedicated collection equipment, it is possible to collect the dirt components originating from the cleaning liquid in a concentrated state. As a result, it is possible to reduce the amount of dirt components derived from the cleaning liquid mixed into the subsequent precision rinsing liquid, and it is possible to reduce the processing time for activated sludge and the like and the amount of activated carbon used. In addition, the soil components collected in a concentrated state can be treated at low cost such as incineration, and by installing a system for recovering the wastewater after using the rinse mentioned above, the cost of wastewater treatment can be further reduced.

[0014] The equipment for specifically collecting the waste water after rinsing with water particles according to the method of the invention may be of any type or system. A simple example is to install a rinsing water tank, and the waste water in the tank can be treated with oil-water separation or the like, or it can be used as rinsing water again. The cleaning agent or cleaning method used in this cleaning method is not particularly limited.
It is effective for any cleaning agent that can be rinsed with water.

[0015] Originally, pure water is desirable as the rinsing water, but depending on the purpose, it is also possible to add antifoaming agents, rust preventives, water generating agents, alcohols, etc.

The cleaning method of the present invention has particularly excellent effects when cleaning precision parts or jigs and tools used in the assembly process thereof. Here, precision parts include, for example, electronic parts,
Refers to electrical parts, precision mechanical parts, resin processed parts, optical parts, etc. Electronic components include, for example, printed wiring boards used in computers and their peripheral equipment, home appliances, communication equipment, OA equipment, and other electronic application equipment; IC lead frames, resistors, capacitors, relays, and other contact members. hoop materials; liquid crystal displays used in OA equipment, watches, computer equipment, toys, home appliances, etc.; magnetic recording parts used in video/audio recording/playback parts and related parts; silicon and ceramic wafers, etc. Semiconductor materials; electrostrictive parts such as crystal resonators; photoelectric conversion parts used in CDs, PDs, copying equipment, optical recording equipment, etc. What are electrical parts?
For example, electric motor parts such as brushes, rotors, stators, and housing; ticket issuing parts used in vending machines and various equipment;
Refers to coin inspection parts used in vending machines, cash dispensers, etc. Precision mechanical parts include, for example, bearings used in precision drive equipment, video recorders, etc., and machining parts such as carbide tips. The resin-processed parts refer to, for example, precision resin-processed parts used in cameras, automobiles, and the like. Furthermore, optical components include lenses used in cameras, glasses, optical equipment, etc.
Examples of other parts include eyeglass frames, watch cases, and watch straps. In addition, the jigs and tools used in the assembly processing process mentioned above refer to the jigs and tools used in various processes such as manufacturing, molding, processing, assembly, and finishing of precision parts as shown in the various parts examples above. In addition, it refers to various equipment that handles these precision parts, their parts, etc.

The cleaning method of the present invention exhibits particularly suitable performance when cleaning printed wiring boards with residual flux, liquid crystals, etc. adhered to glass substrates among the above-mentioned items. The tools and jigs are not limited to these examples, and may be contaminated with substances that interfere with subsequent processes such as various processing oils and fluxes during the assembly process, or with various oil-based contaminants that degrade the characteristics of the product. The cleaning method of the present invention can be applied to precision parts and jigs and tools that have a solid surface of a certain shape.

These contaminants include, for example, fats and oils, machine oil, cutting oil, grease, liquid crystal, rosin flux, etc.
The features of the cleaning method of the present invention are particularly effective when the stain is mainly organic oil. It is also effective even when dirt contains metal powder, inorganic powder, etc.

[0019]

[Operation] According to the rinsing method of the present invention, when the rinsing water is finely divided so that the average particle size is 1 μ to 5 mm and is supplied onto the object to be cleaned, the rinsing water is uniformly supplied onto the object to be cleaned. At this time, the amount of rinsing water used per unit time can also be controlled, so it is possible to reduce the amount of rinsing water that flows down from the surface of the object to be cleaned without fully exerting its rinsing effect.

[0020]

[Examples] The present invention will be explained in more detail with reference to Examples, but the present invention is not limited thereto.

Example 1

A 15 cm x 15 cm printed mounting board was prepared using detergent A [polyoxyethylene nonyl phenyl ether (HLB=12.
3) 5% (% is based on weight; the same applies hereinafter), monoethanolamine 3%, water 82%] or cleaning agent B (butyl glycol single item), then air blow, and 1 g is placed on the printed circuit board. of detergent solution remained. Thereafter, this substrate was stood up, and 20 ml of rinsing water with an average particle size of 0.5 mm was sprayed onto the surface using the atomizing principle, and the rinsing liquid dripping from the substrate was collected and the amount of detergent liquid was analyzed. In the rinsing method of spraying water particles with an average particle size of 0.5 mm, 90% of detergent A and 85% of detergent B on the substrate could be removed. When the detergent A was similarly rinsed with an average particle size of 2 mm, 85% of detergent A was removed, and when the average particle size was similarly rinsed with an average particle size of 5 mm, 65% was removed. Furthermore, as a comparative example, 20 ml of rinsing water was
Rinsing was performed by spraying onto the substrate surface using an injector (syringe) having a nozzle of m. When using an injector, only 48% of detergent A and 35% of detergent B could be removed. Further, when the rinsing method of spraying water particles with an average particle size of 0.5 mm was performed twice, more than 97% of detergent A and detergent B were removed. When rinsing using an injector, detergent A
In order to remove 97% or more of detergent B, 650 ml of rinsing water was required.

[0023]

According to the cleaning method of the present invention, rinsing water generated in the cleaning process for precision parts or jigs and tools used in the assembly process thereof can be reduced, and wastewater treatment is also very easy.

Claims (2)

[Claims] [Claim 1] Water for rinsing (hereinafter referred to as "rinsing") is finely divided so that the average particle size is 1 μ to 5 mm, and the water for rinsing is washed with a cleaning solution prior to rinsing. A method for cleaning precision parts or jigs and tools used in the assembly process thereof, in which a cleaning solution is supplied to an object to be cleaned in an amount of 1 to 300 times the amount of cleaning liquid attached to the object. 2. A cleaning method comprising a system for recovering the rinsing liquid generated in the rinsing step according to claim 1.