KR100542905B1 - Automation equipment for production of ceramic shell mold - Google Patents

Abstract

The present invention relates to a ceramic shell mold automatic manufacturing apparatus,

1. A ceramic shell mold manufacturing apparatus, comprising: a mixed ceramic storage container (11) for storing a ceramic powder blended in an upper portion of a manufacturing apparatus; A mixed binder storage container 14 installed at a side of the mixed ceramic storage container 11 and storing the mixed binder; A slurry mixer (16) installed at a lower portion of the mixed ceramic storage container (11) and the mixed binder storage container (14) to form a slurry by mixing the ceramic and the binder; A vacuum slurry injector installed under the slurry mixer and injecting a slurry using a vacuum; It characterized in that it comprises a controller 21 for controlling the amount of the ceramic and the binder introduced into the slurry mixer 16, and controls the injection amount of the slurry,

The automatic processing of the ceramic mold manufacturing process, which relies on simple, repeatable manual operations, not only improves productivity but also maintains the homeostasis of mold quality.

Ceramic Shell Molds, Automatic Manufacturing Equipment, Control Logic

Description

Ceramic Shell Mold Automatic Manufacturing Equipment {AUTOMATION EQUIPMENT FOR PRODUCTION OF CERAMIC SHELL MOLD}

1A to 1F are process diagrams illustrating respective manufacturing steps of a ceramic shell mold according to the related art.

2 is a flow chart showing a manufacturing process of a ceramic shell mold according to an embodiment of the present invention.

Figure 3 is a schematic diagram showing the configuration of the automatic ceramic shell mold manufacturing apparatus according to an embodiment of the present invention.

Figure 4 is a flow chart showing the operation of the automatic ceramic shell mold manufacturing apparatus according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

9: mold 10: load cell

11: mixed ceramic container 12: feeder (Feeder)

13: funnel 14: mixing binder container

15 load cell 16 slurry mixer

17: stirrer 18: pressure reducing valve

19: pressure gauge 20: load cell

21: controller 22: pressure reducing valve

23 pressure gauge 24 injection valve

25: cylinder

The present invention relates to a ceramic shell mold automatic manufacturing apparatus, and more particularly, to the mixing of the ceramic and the mixing binder, the mixing and defoaming of the ceramic slurry, the operation of the mold, and injecting the ceramic slurry, which is performed by conventional manual labor A ceramic shell mold automatic manufacturing apparatus capable of automatically integrating processes.

The shell mold casting method is a special casting method, in which a metal model is heated, a silicon resin as a release agent is applied thereon, and a mold is buried in a mold material containing SiO ₂ and a thermosetting resin binder. .

Recently, the development of a casting material having better high temperature characteristics than conventional ceramic molds and less reactivity with molten metal during casting is required. Since the ceramic shell mold must contain the melt for a long time at a high temperature, it is widely used because of its excellent high temperature characteristics and less reactivity than the conventional ceramic mold.

Automation of casting facilities is expected to be inevitable due to labor shortage, and technology development is actively being promoted. The automation of facilities is urgently required as the urgent task in terms of reducing the cost of casting production by maintaining and improving the poor working environment, and maintaining and improving the quality of casting products.

Molding methods can be largely divided into mechanical molding and hand molding. The hand molding method has the advantages of simple equipment or equipment, but it has disadvantages such as slow production speed, uneven molding strength due to unbalanced work according to workers, and product differences depending on the skill of workers.

On the other hand, various types of machines are used for compacting sand, removing models, inverting and combining finished molds for mass production and uniformity of molding operations. There is an advantage that the weight of the product is reduced, so in recent years the automation of the entire casting process is a trend.

This trend of automation is primarily aimed at increasing production, and at the same time, the quality and reliability of molds, the lack of professional manpower and the lack of labor force can be attributed to the reasons for improvement of working conditions and environment of workers. It can be said.

Hereinafter, a manufacturing process of a conventional ceramic shell mold will be described in detail with reference to the accompanying drawings.

1A to 1F are process diagrams showing respective manufacturing steps of the ceramic shell mold according to the related art. That is, Figure 1a is a process for producing a mold for manufacturing a backup mold, Figure 1b is a process for forming a backup mold using chamotte sand, Figure 1c shows a backup mold, Figure 1d and the backup mold Fig. 1E shows a ceramic shell mold using a backup mold, and Fig. 1F shows a preparation state for injecting molten metal between the models.

First, as shown in FIG. 1A, in the process of manufacturing a mold for manufacturing a backup mold, the model is placed on the bottom of the mold and covered with a passage-shaped resin 1 for injecting slurry thereon. Next, as shown in FIG. 1B, the chamotte sand 2 is introduced into the mold to form a backup mold. Next, the completed backup mold 3 and the passage-shaped resin 1 are lifted out of the mold. Next, as shown in FIG. 1D, the backup mold is again put into the mold, and the ceramic slurry 4 previously mixed between the backup mold and the mold is injected. Next, after fixing the ceramic slurry as shown in FIG. 1E, the mold, the backup mold 3, and the shell mold 5 are picked up from the mold to separate the mold. Next, as shown in FIG. 1F, the backup mold 3 is turned upside down to install a molten metal inlet 6 to prepare a casting operation.

BACKGROUND ART Conventionally, various techniques related to a casting manufacturing process using a mold made of ceramic are known. In particular, in Korean Unexamined Patent Publication No. 193-0002018, when the ceramic shell mold is manufactured, the strength of the shell mold is only weak because only a thin ceramic mold is used. As shown in FIG. 3) to provide a method of manufacturing and casting. Since then, a method of fabricating a high-strength ceramic mold that has sufficient strength in a thin state without a backup mold has been developed.

However, since these manufacturing processes are all made by hand, excessive labor costs are required, and there is a limit to increasing productivity, thereby limiting the cost competitiveness of the product. In addition, there is a problem in that the homeostasis of the quality is lower depending on the skill of the operator.

At present, there are no devices manufactured for this purpose. In particular, there is no device that can manage the required manufacturing process integrated into one machine.

The present invention has been made to solve the above-mentioned conventional problems, in the process of manufacturing a ceramic shell mold, conventional ceramic powder and caking of the binder, the mixing of the ceramic slurry, defoaming and mold mold An object of the present invention is to provide an automatic ceramic shell mold production apparatus capable of automatically performing a process of injecting a ceramic slurry into a ceramic slurry.

In the present invention for achieving the above object is a ceramic shell mold manufacturing apparatus, a mixed ceramic storage container (11) for storing the ceramic powder is installed on top of the manufacturing apparatus; A mixed binder storage container 14 installed at a side of the mixed ceramic storage container 11 and storing the mixed binder; A slurry mixer (16) installed at a lower portion of the mixed ceramic storage container (11) and the mixed binder storage container (14) to form a slurry by mixing the ceramic and the binder; A vacuum slurry injector installed under the slurry mixer and injecting a slurry using a vacuum; It characterized in that it comprises a controller 21 for controlling the amount of ceramic and point payment flowing into the slurry mixer 16, and controls the injection amount of the slurry.

More preferably, at the lower end of the mixed ceramic storage container 11 and the mixed binder storage container 14, load cells 10 and 15 for measuring the amount of the ceramic and the binder are installed, and the mixed ceramic storage container 11 is provided. At the outlet side of the feeder 12 for transferring the ceramic powder discharged from the mixed ceramic storage container 11 to the slurry mixer 16 is provided.

More preferably, the slurry mixer 16 includes a rotary stirrer 17 for mixing the ceramic and the binder evenly therein and a motor connected thereto, and a pressure reducing valve connected to the pneumatic device to remove bubbles in the slurry. 18 and a pressure gauge 19 are mounted, and at the lower end, a load cell 20 for monitoring the amount of slurry is provided.

More preferably, the vacuum slurry injector is provided with a mold frame therein, a cylinder 25 is installed at the lower part of the mold frame to move the mold frame 9 up and down and detachable from the injection valve 24, the rapid A pressure reducing valve 22 and a pressure gauge 23 are connected to the pneumatic device for injection.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

Figure 2 is a flow chart showing a manufacturing process of a ceramic shell mold according to an embodiment of the present invention, Figure 3 is a block diagram showing the configuration of an automatic ceramic shell mold manufacturing apparatus according to an embodiment of the present invention, Figure 4 is 1 is a flowchart illustrating a working sequence of the apparatus for automatically manufacturing a ceramic shell mold according to an embodiment of the present invention.

As shown in Fig. 2, a high strength ceramic mold having sufficient strength is produced through the following process. This embodiment relates to a manufacturing apparatus that can automatically process some of these processes.

The manufacturing process of high strength thin ceramic mold goes through the step of blending a plurality of powder ceramics (S10), and then mixes various liquid substances of alcohol and resin type (S12) and matures them to make a special binder (binder). (S13), blending the powdered ceramic powder and the binder to make a ceramic slurry (S15), degassing the air bubbles mixed during slurry production (S16), injecting the slurry into the mold using a vacuum ( 17), after the slurry is solidified, the mold mold is dismantled (S18) and the ceramic cell mold in the mold state (19), and the sintering step (S20) to complete the shell mold (S21) and the like.

3 is a block diagram of a manufacturing apparatus for automating the operation from the step of blending the mixed powder ceramic and the binder to the step of injecting the slurry into the mold using a vacuum in the process shown in FIG.

Hereinafter, the configuration of the manufacturing apparatus according to the present embodiment will be described in detail.

The manufacturing apparatus of this embodiment is largely comprised of the mixed ceramic reservoir 11, the mixed binder reservoir 14, the slurry mixer 16, the vacuum slurry injector and the controller 21. They are also connected by weighing and feeding devices for precise weighing. Each unit device is arranged to form a hierarchy according to the mixing order in order to use gravity when transferring the contents.

In the uppermost layer of the manufacturing apparatus of this embodiment, a mixed ceramic storage container 11 for storing mixed ceramics in a solid powder state is provided. In the lower part, the feeder 12 which feeds mixed ceramic powder to the funnel 13 attached to the inlet part of the slurry mixer 16 is arrange | positioned. The mixing ceramic is transferred to the funnel 13 of the slurry mixer 16 while determining the amount to be mixed according to the casting plan and the mixing ratio of the binder and metering to discharge only the necessary amount into the load cell 10. At this time, the funnel 13 allows the transported mixed ceramic to slide down to the slurry mixer 16 well.

The side of the mixed ceramic storage container 11 is provided with a mixed binder storage container 14 that can store the mixed binder separately from the mixed ceramic storage container 11. The load cell 15 is also installed here to monitor the amount of total binder and the amount discharged to the slurry mixer 16. The mixing binder container 14 is provided with a temperature controller and a thermometer to keep the binder at an appropriate temperature. As with the mixed ceramic, the mixed binder is metered into the load cell and sent to the slurry mixer 16 via the funnel by the amount of binder required for mixing. Because the binder is liquid, it is transported by gravity without using a feeder.

The slurry mixer 16 is composed of a rotary stirrer 17 and a motor connected thereto for evenly mixing the ceramic and the binder therein. As the agitator 17 rotates, the solid powder ceramic and the liquid binder are evenly mixed in a thick state to form a slurry. Since bubbles are present in the mixed slurry, when the slurry in this state is directly injected into the mold 9, bubbles are formed in the surface of the mold when the slurry solidifies. As a result, bubbles can be produced because defects can be produced by inducing defects on the surface of the product to be produced as a mold. Therefore, the apparatus of the present embodiment is equipped with a pressure reducing valve 18 and a pressure gauge 19 connected to the pneumatic device to apply a negative pressure (-) to the inside of the slurry mixer 16 in order to remove bubbles remaining in the slurry. The pressure gauge 19 is for checking the internal pressure in order to control the appropriate negative pressure in the slurry mixer 16.

The load cell 20 is installed at the bottom of the slurry mixer 16 as a meter for monitoring the remaining amount, so that the amount of slurry remaining in the slurry mixer 16 can be grasped. The amount measured in the load cell 20 is input to the integrated controller 21 for automatic control.

The mixed and degassed slurry is arranged to be injected into the mold 9 in the vacuum slurry injector through an injection valve 24 attached to the bottom of the slurry mixer 16. The vacuum slurry injector is provided with a pressure reducing valve 22 and a pressure gauge 23 connected to the pneumatic device to apply a negative pressure in a vacuum state. In order to inject the slurry, sufficient pressure reduction is achieved by the pressure reducing valve 22 attached to the vacuum slurry injector, and the internal pressure is measured and monitored by the pressure gauge 23 in the controller 21, and the appropriate negative pressure ( When it reaches-), the injection valve 24 is opened automatically and the slurry is rapidly injected into the mold 9 from the slurry mixer 16. This is for densely infiltrating the slurry into the mold 9.

In the vacuum slurry injector, a support for placing the mold frame 8 is installed and connected to the pneumatic cylinder 25 installed at the bottom thereof. The cylinder 25 is made to be conveyed up and down. When it is transported downward, the injection valve 24 and the mold inlet is separated, and when it is transported upward, the inlet and the valve of the mold are coupled.

The integrated controller 21 which controls the unit devices and the entire system of the shell mold automatic manufacturing device is composed of a PLC, a PC, and a monitor for worker monitoring, and it is possible to identify, monitor and set the status of the entire process and the unit. When the value is input, it plays the role of controlling the measured value to reach the set value sequentially.

Hereinafter, the operation of the manufacturing apparatus according to the present embodiment will be described in detail.

The manufacturing apparatus of this embodiment is automatically driven in the order as shown in FIG.

First, the time series of the amount of slurry to be injected into the mold 9 is input to the PC (S30). The mold 9 is placed at a work table in the vacuum slurry injector, and decompression is started to release air in the injector (S31). Thereafter, the remaining amount of slurry in the slurry mixer 16 is measured by the monitoring load cell 20 (S32) to determine whether a sufficient amount of slurry remains to be injected into the mold 9 (S33). If the amount is not sufficient, the mixed ceramic and the mixed binder are metered by an appropriate amount (S40, S41), transferred to the slurry mixer 16 (S42), the mixed ceramic and the mixed binder are mixed (S43), and the air bubbles in the slurry Remove (S44). When the remaining amount is sufficient, the mold frame 9 is lifted by the pneumatic cylinder 25 and in close contact with the inlet of the injection valve 24 provided at the lower end of the slurry mixer 16 (S34). The injection valve 24 is opened (S35), and the slurry is injected into the mold 9 in a vacuum state while depressurizing the slurry injector (S36). After a certain time has elapsed, the injection valve 24 is closed (S37), and the mold mold 9 is lowered by the operation of the pneumatic cylinder 25 to solidify properly (S38), and then the mold mold 9 is slurry injector. Lift out and replace the mold (S39) and repeat the above operations.

The present invention described above can be embodied in many other forms without departing from the spirit or main features thereof. Therefore, the above embodiments are merely examples in all respects and should not be interpreted limitedly.

As described above, the present invention automatically processes the ceramic mold manufacturing process, which relies on simple repetitive manual operations, thereby improving productivity and providing homeostasis of mold quality.

Claims (4)

In the ceramic shell mold manufacturing apparatus, A mixed ceramic storage container 11 installed at the top of the manufacturing apparatus and storing the blended ceramic powder; A mixed binder storage container 14 installed at a side of the mixed ceramic storage container 11 and storing the mixed binder; A slurry mixer (16) installed at a lower portion of the mixed ceramic storage container (11) and the mixed binder storage container (14) to form a slurry by mixing the ceramic and the binder; A vacuum slurry injector installed at a lower portion of the slurry mixer 16 to inject a slurry using a vacuum; It comprises a controller 21 for controlling the amount of the ceramic and the binder introduced into the slurry mixer 16, and controls the injection amount of the slurry, At the lower end of the mixed ceramic storage container 11 and the mixed binder storage container 14, load cells 10 and 15 for measuring the amount of the ceramic and the binder are installed. Automatic manufacture of ceramic shell mold, characterized in that the feeder 12 for transferring the ceramic powder discharged from the mixed ceramic storage container 11 to the slurry mixer 16 is installed at the outlet side of the mixed ceramic storage container 11. Device. delete The method of claim 1, The slurry mixer 16 is composed of a rotary stirrer 17 for mixing the ceramic and the binder evenly therein and a motor connected thereto, and a pressure reducing valve 18 for connecting with a pneumatic device to remove bubbles in the slurry, and A pressure gauge 19 is mounted, and at the lower end, a load cell 20 for monitoring the amount of slurry is provided. The method of claim 1, The vacuum slurry injector has a mold formed therein, and a cylinder 25 is installed at the lower portion of the mold to move the mold 9 to and detached from the injection valve 24. A device for automatically manufacturing a ceramic shell mold, characterized in that a pressure reducing valve (22) and a pressure gauge (23) are connected to the device.

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