JPH07136602A - Method for cleaning mold - Google Patents

Abstract

PURPOSE:To prevent an evaporation trace of water from being caused and enable casting as it is and enhance the circulation efficiency of a mold by spouting the jets of high-pressure water on the internal surface of a stained mold used for production of a plastic product and completely removing a foreign matter stuck thereon and thereafter drying the mold at vacuum. CONSTITUTION:In the case of preparing a mold for blade forming as a mold 1 and cleaning the mold 1 after releasing a product from the mold, firstly the mold 1 is placed on a belt conveyor 3 and carried into a cleaning chamber 4 whose circumference is covered with a cover 4A. While spouting the jets of high-pressure water 2 through a jetting nozzle 5 of high-pressure water under the condition of 1.5l/min discharge amount, 3500kgf/cm<2> discharge pressure and phi15mm jetting range from the top of the mold 1 opened toward the upper part, the mold 1 is conveyed at 250mm/min conveyance velocity. Thereby cleaning of the mold 1 is performed and the mold 1 is immediately carried into a vacuum oven 6 just as water droplets are stuck thereto. Vacuum drying is performed for a munite at <=5mmHg. Thereby, drying is carried out without causing evaporation trace of water. The mold 1 in which cleaning and drying have been finished is conveyed to a casting process and used as it is.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold cleaning method,
Specifically, it relates to improvement of a mold cleaning method.

[0002]

2. Description of the Related Art Conventionally, a casting method using a casting mold has been mainly used for manufacturing plastic products. In this casting method, in order to make the smoothness of the product surface more perfect,
It is necessary to keep the inner surface of the mold clean before starting the casting operation. Therefore, when the mold is reused after the product is molded, the cleaning step of the inner surface of the casting mold is an indispensable step. As a means for cleaning the inner surface of the dirty mold, after applying a cleaning solution such as a resin solvent or an alkaline cleaning solution, brushing by hand, automatic cleaning with a rotating brush device, or placing the mold in an ultrasonic cleaning tank It is known to dip and wash (for example, Japanese Patent Laid-Open No. 58-223471) and to feed high-pressure water into the inside of a soiling mold for washing (for example, Japanese Patent Laid-Open No. 61-47218).

[0003]

[Problems of the prior art] However, when the above resin solvent is used, there is a sanitary problem, and since cleaning by manual brushing requires a lot of time and labor, the rotation efficiency of the mold is deteriorated. In addition, automatic cleaning with a rotating brush device may not be able to sufficiently clean the inner corners of the mold, and this may cause problems such as foreign matter defects and edge defect defects on the product surface due to residual foreign matter. It was

Further, when the ultrasonic cleaning tank is used, the dirt can be removed very well, but the equipment is large, and there is a drawback that the equipment cost is required to implement it. Although there is no problem in terms of equipment as described above when using high-pressure water injection, etc.,
Since water is used, the generation of rust on the inner surface of the mold becomes a problem. Normally, in order to prevent this rust generation, the mold after cleaning is quickly carried into a heating device such as an oven and forcedly dried, but there may be traces of moisture evaporation on the mold surface,
When the next resin injection molding is performed as it is, there is a problem that the above-mentioned evaporation trace is transferred to the product surface, which causes a surface defect.
Therefore, in order to solve such a problem, it is necessary to perform cleaning with high-pressure water and then polishing with a compound to wipe off evaporation traces again, and a work of wiping this compound, which is rather disadvantageous in that the work is complicated. .

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention makes it possible to easily clean a stain-resistant die without requiring a large amount of equipment, and to keep efficiency after leaving a trace of evaporation after the fact. It was made for the purpose of cleaning the mold well.

[0006]

That is, according to the mold cleaning method of the present invention, high-pressure jet water 2 is sprayed on the inner surface of the dirty mold 1 to completely remove the adhering foreign matter, and then the mold is vacuum dried. It is characterized by that.

[0007]

In the present invention, high pressure jet water is used for cleaning the inner surface of the soiling mold. Therefore, even the water-insoluble resin can be completely removed by the high-pressure jet water, and foreign matters such as inner corners do not remain, so that the mold can be completely cleaned in a short time. After cleaning, it is necessary to perform early drying to prevent the generation of rust, but in the present invention, vacuum drying is used for this drying. Therefore, no trace of evaporation remains on the inner surface of the mold, and the state of the inner surface of the mold is almost complete after complete drying.

[0008]

Embodiments of the present invention will be described below. FIG. 1 is an explanatory diagram of an embodiment of the present invention.

As a mold 1, a mold for blade molding is prepared, and the mold 1 after product demolding is placed on a belt conveyor 3 and carried into a cleaning chamber 4 whose periphery is covered with a cover 4A and opened upward. Discharge rate from above the die 1 1.5 l / min, discharge pressure 3,500k
The high-pressure jet water 2 was jetted by the high-pressure water jet nozzle 5 having gf / cm ² and a jetting range of φ15 mm, and the jetted water was transported at a transport speed of 250 mm / min. Then, the mold 1 with the water droplets still attached was immediately carried into the vacuum oven 6 and vacuum dried at 5 mmHg or less for 1 minute. Observation of the inner surface of the mold 1 carried out from the vacuum oven 6 revealed that the inner surface of the mold was very beautiful and could be immediately conveyed to the next casting step.

As a comparative example, when the mold after being washed with high-pressure jet water 2 was heated and dried in an oven heated to 100 ° C., the inside of the mold 1 taken out of the heating oven had cleaning water scattered in some places. A trace of evaporation was observed, and it was unusable in the next casting step as it was.

[0011]

As described above, according to the method of the present invention, since high pressure water is used for cleaning the mold, expensive equipment is not required as a cleaning device, and since vacuum drying is performed, traces of water evaporation are not generated. This is not possible, and since it can be conveyed as it is to the casting step, the rotation efficiency of the mold becomes very good, and there is the effect that mold equipment can be omitted compared to the conventional case. In addition, since no solvent is used for cleaning, environmental hygiene is not a problem.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mold 2 ... High-pressure jet water 3 ... Belt conveyor 4 ... Washing room 4A ... Cover 5 ... High-pressure water jet nozzle 6 ... Vacuum oven

Claims (1)

[Claims] 1. A method of cleaning a mold, which comprises spraying high-pressure jet water 2 onto the inner surface of a dirty mold 1 to completely remove adhering foreign matter, and then vacuum drying the mold.