KR102463069B1 - A coating device of molding sand for detailed mold - Google Patents

Abstract

The present invention relates to a coating device of molding sand for a precision mold, and more specifically, to a coating device of molding sand for a precision mold, wherein the surface of a wax injection manufactured by a lost wax method used for a precision mold used in precision casting is coated with molding sand. For the purpose, provided is a coating device of molding sand for a precision mold, comprising: a first coating station (1) for primarily coating the surface of a wax model with molding sand, coating the same with fine-grained particulate molding sand to form an inner layer surface being in contact with the surface of a molded object, and coating the coating surface of particulate molding sand with mixed molding sand in which the fine-grained particulate molding sand is mixed with medium-grained molding sand having a grain size greater than the particulate molding sand; a second coating station (2) for coating with medium-grained molding sand to form an intermediate layer located next to the first coating station (1); and a third coating station (3) for coating with large-grained molding sand having a grain size greater than the medium-grained molding sand to form an outer layer surface located outermost.

Description

Precision mold casting sand coating device {A COATING DEVICE OF MOLDING SAND FOR DETAILED MOLD}

The present invention relates to a precision casting sand coating device, and to a precision mold casting sand coating device for coating the molding sand on the surface of a wax injection manufactured by the lost wax technique used for a precision mold used in precision casting.

In general, a lost wax casting method is used as a method of manufacturing a model using wax among methods used for mass production of precision molds.

In the case of such a lost wax casting method, a model is completed using wax that can be melted and solidified even at a relatively low temperature, and then a casting sand is coated on the surface of the wax model as described above to harden, then the wax is removed and used as a mold. say

As a core technology of this lost wax casting method, the above-described casting sand is coated on the surface of the wax model, and the quality of the produced casting is affected according to the coating precision of the casting sand.

Accordingly, various methods are applied, and Korean Patent Application Laid-Open No. 10-2012-0137836 (Cylindrical Rain Sander, published on December 24, 2012, hereinafter referred to as 'Prior Art 1') discloses a cylindrical rain sander in a cylindrical shape. body and; an open partition coupled to one side of the cylindrical body; L-shaped wings formed at equal intervals inside the cylindrical body to scoop up the lower part of the cylindrical body and pour it from the upper part of the cylindrical body; It is configured to provide a cylindrical rain sander, characterized in that it evenly distributes the amount of falling sand inside the cylindrical body.

However, since the prior art 1 provides only a single sander for coating the molding sand on the wax model, a line-type production system or apparatus applied to the mass production system was required.

Accordingly, Republic of Korea Patent No. 10-1755016 (Precision casting mold automatic coating line and mold manufacturing method, registered on June 30, 2017, hereinafter referred to as 'prior art 2') is a sand model using a plurality of processes. We propose a precision casting mold automatic coating line and mold manufacturing method that completes the mold after passing through it. The mold coating line includes a primary coating line, a secondary coating line and a third coating line, and each of the primary coating line, the secondary coating line and the third coating line includes a washing unit, a pre-wet tank, a slurry mixer, It includes at least one of a rainfall sander, a drying room, and a moving unit. In the mold manufacturing method, a mold is coated using a mold coating line to make a mold, and a first type coating step, a second type coating step and a third type coating step are performed.

The prior art 2 as described above also proposes a production line technology for mass production, but it is simply using a multi-time coating operation for a line-type device, and the quality of the molding sand coating film coated on the mold wax is not uniform, so the mold There is a problem that the quality of the molds produced by using them is uneven.

Republic of Korea Patent Publication No. 10-2012-0137836 (Cylindrical Rain Sander, published on December 24, 2012) Republic of Korea Patent Registration No. 10-1755016 (Precision casting mold automatic coating line and mold manufacturing method)

In order to overcome the above problems, an object of the present invention is to provide a precision mold casting sand coating device capable of maintaining the even quality of the molding sand mold used in the lost wax casting method.

The present invention is a precision mold casting sand that can reduce production efficiency and manufacturing time by minimizing the preparation work and learning time for producing a small amount of a variety of products by using an automated control device when producing automatically through a line-type production device. It is another object to provide a coating device.

In order to achieve the object of the present invention, the molding sand is first coated on the surface of the wax model, and in order to form the inner skin surface in contact with the surface of the mold, fine-grained small-grained molding sand is coated, and the small-grained molding sand is coated on the coated surface A first coating station (1) for coating mixed molding sand mixed with fine-grained molding sand and neutral molding sand having a larger particle size than small-grained molding sand; and an intermediate layer located next to the first coating station (1) A second coating station (2) for coating the neutral casting sand to do; and a third coating station (3) that coats the large particle size sand compared to the neutral sand to form the outermost surface.

The first coating station 1 is a molding sand coating machine 11 for coating the molding sand on the wax model, a dryer 12 for drying the wax model coated with the molding sand, and a molding sand for supplying the molding sand to the molding sand coating machine 11. The feeder 13 and the transfer means 14 for coating the molding sand on the wax model and transferring the wax model, and a wax model processing unit for washing to remove foreign substances from the surface of the wax model, rinsing as a release agent, etc. It consists of (15).

In addition, the wax model treatment unit 15 is for a treatment operation that must be performed before coating the molding sand, and includes a washing tank 151 for removing the mold release agent and foreign substances remaining on the surface of the wax model, and the wax treated in the washing tank 151 . A first rinse tank 152 for removing foreign substances remaining on the surface of the model, and a second rinse tank 152 for removing other foreign substances remaining on the wax surface by immersing the wax model treated in the first rinse tank 152 The rinse tank 153, the washing tank 154 for washing the rinse remaining on the surface of the wax model immersed in the first rinse tank 152 and the second rinse tank 153, and the casting sand are attached to the surface of the wax model It is composed of a slurry tank (155a) that can be.

In addition, the molding sand feeder 13 is further provided with a stirring member to prevent the molding sand from aggregating, and the second coating station 2 completes the molding sand coating of the inner skin portion in the first coating station 1, A molding sand coating machine 21 for coating the molding sand forming an intermediate layer on the wax model transferred from the inside of the dryer 12, and a dryer 22 for transporting and drying the wax model coated with the molding sand from the molding sand coating machine 21 and a molding sand feeder 23 for supplying neutral molding sand to the molding sand coating machine 21, a rotary transfer means 24 for process transfer of the wax model, and the first coating station 1, and the wax model transferred A slurry tank 255a, a wax model draw-out belt 26a, and a wax model draw-in belt 26b that are disposed adjacent to the adhesion strengthening part 251 and the adhesive force strengthening part 251 to increase the surface adhesion before secondary coating ) is composed of

Connected to the first coating station (1) to the third coating station (3), an air conditioner (4) for air conditioning of the dryer is further included, and the first coating station (1) to the third coating station (3) A control unit 5 for controlling is further included, and after melting and removing the wax located inside the coated mold, a tester for inspecting the completeness of the mold is provided. By doing so, the object of the present invention can be better achieved.

By providing the precision casting sand coating apparatus of the present invention, there is an effect of maintaining the even quality of the molding sand mold used in the lost wax casting method.

Another effect of the present invention is to reduce the production efficiency and manufacturing time by minimizing the preparation work and learning time for producing a small quantity of various products using the automated control device when the production is automated through the line-type production device. has the effect of

1 is a plan sectional view for showing the configuration of the precision casting sand coating apparatus according to the present invention.
Figure 2 is an exemplary view for showing the concept of the tray (T) for the transfer of the wax model according to the present invention.
3 is an enlarged view of a portion of the first coating station 1 of the precision casting sand coating apparatus according to the present invention.
Figure 4 is an enlarged view of a portion of the second coating station (2) of the precision casting sand coating apparatus according to the present invention.
5 is an enlarged view of a portion of the third coating station 3 of the precision mold sand coating apparatus according to the present invention.
6 is a plan view showing the configuration of a dryer and an air conditioner of the precision casting sand coating apparatus according to the present invention.
7 is a schematic diagram showing the configuration of the precision casting sand coating apparatus according to the present invention.

Hereinafter, the precision casting sand coating apparatus of the present invention will be described in detail with reference to the drawings so that those skilled in the art can easily implement it.

1 is a plan sectional view for illustrating the configuration of a precision casting sand coating apparatus according to the present invention, and FIG. 2 is an exemplary view for illustrating the concept of a tray (T) for transferring a wax model according to the present invention, FIG. 3 is an enlarged view of a part of the first coating station 1 of the precision mold sand coating apparatus according to the present invention, and FIG. 4 is a portion of the second coating station 2 of the precision mold sand coating apparatus according to the present invention 5 is an enlarged view of a part of the third coating station 3 of the precision casting sand coating apparatus according to the present invention, and FIG. 6 is an enlarged view of the dryer and air conditioner of the precision casting sand coating apparatus according to the present invention. It is a floor plan shown.

7 is a schematic diagram showing the configuration of the precision casting sand coating apparatus according to the present invention.

1 to 7, the precision mold casting sand coating apparatus of the present invention is a first coating station (1) in which the molding sand is first coated on a wax model, and forms an inner skin surface in contact with the surface of the mold and , a second coating station (2) forming an intermediate layer positioned next to the first coating station (1) and a third coating station (3) forming an outermost surface of the coating station.

In addition, the first coating station (1) to the third coating station (3) is connected to the air conditioner (4) for air conditioning of the dryer is further included.

In addition, a control unit 5 for controlling the first coating station 1 to the third coating station 3 and the air conditioner 4 is further included.

The first coating station 1 as described above is a molding sand coating machine 11 for coating the molding sand on the wax model, a dryer 12 for drying the wax model coated with the molding sand, and the molding sand coating machine 11. A casting sand feeder 13 for coating the molding sand on the wax model and a transfer means 14 for transferring the wax model and washing to remove foreign substances from the surface of the wax model, rinsing agent as a release agent, etc. It is composed of a model processing unit (15).

At this time, the molding sand coating machine 11 is formed with a space inside which can contain the molding sand for coating, and can be rotated after inserting the wax model into the space formed as described above, so that the molding sand for coating is inside. It is to be coated by falling into the drawn wax model, or to be coated by spraying the molding sand introduced into the space inside the wax model.

The dryer 12 is for drying the wax model coated with the molding sand in the molding sand coating machine 11, and the wax model coated with the molding sand in the molding sand coating machine 11 is transferred through the transfer means 14 to the inside of the chamber of the dryer 12. After transferring it to the furnace, it is transferred along the transfer line so that it can be dried.

In addition, the molding sand feeder 13 can supply small-grained molding sand of fine particles to the molding sand coating machine 11 .

At this time, the molding sand feeder 13 is further provided with a stirring member in order to prevent agglomeration of the fine-grained molding sand.

The stirring member may be a mechanical stirrer or an air stirrer, and anything that prevents agglomeration of the molding sand is possible.

In addition, the molding sand feeder 13 is a molding sand feeder for supplying the fine-grained molding sand for supplying the fine-grained molding sand, and the mixed molding sand mixed with the fine-grained molding sand and the neutral molding sand having a larger particle size than the small-grained molding sand can be supplied. A molding sand feeder 13 is further provided.

In the first coating station (1), in order to form the inner skin surface, fine-grained small-grained molding sand is first coated, and then mixed molding sand mixed with small-grained and neutral molding sand is secondarily coated on the outside of the small-grained molding sand coating layer. This is for coating.

Here, the reason for further coating the mixed-type molding sand after coating the fine-grained molding sand of the inner skin surface as described above is to allow the neutral molding sand coating layer implemented in the second coating station 2 to be better adhered, This is to allow better adhesion between the neutral yarns of the same particle, and to fill the space between the neutral yarns and the neutral yarns so that the small grain yarns can be formed stronger.

As the transfer means 14, a means such as a rotatable robot arm is used to enable movement between processes after gripping the wax model.

At this time, the conveying means 14 is configured to rotate and linearly move along the conveying rail.

This makes it possible to perform various types of treatment processes that must be performed before coating the molding sand, and typically enables linear movement along the conveying rail because washing operations must be performed.

The transfer means 14 as described above is composed of a pair of rotary gripping means on both sides of the transfer rail, and the gripping means may be any means capable of gripping the wax model by means such as a robot arm.

The wax model processing unit 15 is for a treatment operation that must be performed before coating the molding sand. A first rinse tank 152 for removing foreign substances remaining on the surface and a second rinse tank for removing other foreign substances remaining on the wax surface by immersing the wax model treated in the first rinse tank 152 (153) and the washing tank 154 for washing the rinse remaining on the surface of the wax model immersed in the first rinse tank 152 and the second rinse tank 153, and a molding sand may be attached to the surface of the wax model It is composed of a slurry tank (155a) to allow.

In addition, an auxiliary slurry tank 155b is further disposed adjacent to the slurry tank 155a.

At this time, the wax model processing unit 15 is arranged on the rotational and moving trajectory of the conveying means so that operations such as washing the surface of the wax model and applying the slurry can be continuously performed.

Here, the washing tank 151, the first rinse tank 152, the second rinse tank 153, the water washing tank 154, and the slurry tank 155a of the wax model processing unit 15 are in the form of a cylindrical water tank. When replacing the liquid treatment material supported therein, it can be quickly replaced with another container, and a moving means such as a wheel can be further provided on the lower side to set the arrangement position of the container according to the work situation. can

In the second coating station 2, the molding sand coating of the inner skin part is completed in the first coating station 1, and the molding sand coating machine for coating the molding sand forming an intermediate layer on the wax model transferred from the inside of the dryer 12 ( 21) and a drying machine 22 for transporting and drying the wax model coated with the molding sand in the molding sand coating machine 21 and a molding sand supplying machine 23 for supplying the neutral molding sand to the molding sand coating machine 21 and the wax model An adhesion strengthening unit 251 and the adhesion strengthening unit 251 for increasing surface adhesion before secondary coating of the wax model transferred through the rotary transfer means 24 for process transfer and the first coating station 1 ) and a slurry tank (255a) disposed adjacent to the wax model lead-in belt (26a) and the wax model lead-in belt (26b).

Here, the molding sand coating machine 21 is formed in the same shape as the molding sand coating machine 11 of the first coating station 1 described above.

In addition, the wax model draw-out belt 26a and the dryer 12 are disposed at the ends of the first coating station 1, and the wax model draw-out belt 26b is disposed at the ends of the dryer 22 of the second coating station 2 and the wax model lead-out belt 26a and the wax model lead-in belt 26b are each arranged to form a predetermined angle, so that the rotatable transfer means 24 transports the wax model located on the wax model take-out belt 26a to obtain wax It is transferred to the model inlet belt (26b).

At this time, the adhesive strength strengthening part 251 and the slurry tank 255a are disposed on the rotation radius of the transfer means 24 between the wax model lead-in belt 26a and the wax model lead-in belt 26b as described above.

In addition, an auxiliary slurry tank 255b is further disposed adjacent to the slurry tank 255a as described above.

At this time, the adhesive strength strengthening part 251 is made to contain a material such as silacazole used as an adhesive aid manufacturing.

In the second coating station 2 configured as described above, the wax model coated with the neutral casting sand is transferred through the transfer means 24, transferred to the wax model lead-in belt 26b, drawn into the dryer 22, dried, and then line After drying through the mold transfer device, it is transferred to the third coating station (3).

The third coating station 3 is a molding sand coating machine for coating the molding sand that forms the outer skin layer on the wax model transferred from the inside of the dryer 22, after the coating of the middle part of the molding sand is completed in the second coating station 2 ( 31) and a drying machine 32 for transporting and drying the wax model coated with the molding sand in the molding sand coating machine 31, and a molding sand supplying machine 33 for supplying the opposite molding sand to the molding sand coating machine 31 and the wax model A slurry tank (355a) capable of immersing the wax model transferred through the rotary transfer means (34) and the second coating station (2) for process transfer, the wax model draw-out belt (36a), and the wax model draw-in belt ( 36b).

A plurality of wax models transferred through the first coating station 1 to the third coating station 3 configured as described above are mounted on a plurality of trays T provided on a clamp formed in a star shape. It is transferred through the line-type transfer device of the first coating station (1) to the third coating station (3) through the lift-type hanger, and the coating and drying operations of the molding sand are continuously performed.

The air conditioner 4 is for controlling the temperature, humidity, wind speed and air volume inside the chamber of the dryer 12, 22, 32. When hot air is simply supplied, the wax model is melted and the shape is destroyed or coated. This is to control the temperature, humidity, and flow rate of the supplied gas because the molding sand can be detached without being attached to the skin of the wax model.

The air conditioner 4 as described above is further provided with a filter to prevent foreign substances from being introduced and to prevent foreign substances generated inside the dryer from flowing out to the outside.

The control unit 5 controls and monitors the first coating station 1 to the third coating station 3 and the air conditioner 4 .

At this time, the control unit 5 enables communication with a monitoring device further provided in each coating station, and the monitoring device is a representative display device that can check information and is interlocked with the control unit 5 make it work

In more detail, the operation of each coating station is automatically controlled through the control unit 5 or the command input by the administrator from the control unit 5 is transmitted to the monitoring device to control the operation and each coating station. to monitor the operation of

At this time, the monitoring device is operated in conjunction with the detection means further provided in each coating station, and a representative detection means may be sensors.

For example, a sensor capable of detecting temperature, humidity, wind speed related to air volume, etc. may be provided inside the dryer, and a water level gauge capable of measuring the water level may be provided in the container of each processing unit.

The information sensed from the sensing means provided as described above is input to the monitoring device, and after determining whether there is an abnormality using the information input from the sensing unit, when an abnormality occurs, the monitoring device notifies it through a voice or an optical signal.

In addition, when an abnormal situation occurs in the monitoring device as described above, it is transmitted to the control unit 5 and transmitted to the user's or manager's portable communication terminal through the internal computer network or the external computer network through the controller unit 5 to notify it. do.

In addition, the control unit 5 further includes a memory, so that the working conditions input by the user or administrator are stored and converted into a DB.

At this time, the stored information is indexed, so that when a user or an administrator executes a job under the same condition, the index information is searched for and selected to shorten the process preparation time required for the initial setting job for the job.

This reduces the time required to optimize the work conditions such as setting for work change and test run when working with different types of castings in the general work process, and reduces the defective rate, thereby increasing work efficiency and providing reliable results. to be able to produce it.

The precision mold casting sand coating apparatus of the present invention configured as described above may further include a checker (not shown), which melts and removes wax located inside the coated mold, and then inspects the completeness of the mold. , it is inspected using a light transmissive device.

In more detail, when the light transmitted through the mold through the light transmitting device is emitted to the outside, the mold is determined to be defective, and the thickness of the mold is determined using the amount of transmitted light.

By this configuration, the precision casting sand coating apparatus of the present invention is completed.

1 : 1st coating station 2 : 2nd coating station
3: third coating station 11: molding sand coating machine
12: dryer 13: molding sand feeder
14: transfer means 15: wax model processing unit
21: molding sand coating machine 22: dryer
23: casting sand feeder 24: transport means
26a: wax model draw-out belt 26b: wax model draw-in belt
31: molding sand coating machine 32: dryer
33: casting sand feeder 34: transport means
36a: wax model draw-out belt 36b: wax model draw-in belt
151: washing tank 152: first rinse tank
153: second rinse tank 154: washing tank
155a: slurry tank 155b: auxiliary slurry tank
251: adhesion strengthening part 255a: slurry tank
355a: slurry tank

Claims (8)

The casting sand is first coated on the surface of the wax model, and in order to form the inner skin surface in contact with the surface of the mold, after coating the fine-grained molding sand, the small-grained molding sand and the neutral molding sand are coated on the outside of the small-grained molding sand coating layer A first coating station (1) for secondary coating of mixed molding sand; and
a second coating station (2) for coating the neutral molding sand to form an intermediate layer located next to the first coating station (1); and
Precision casting sand coating device, characterized in that it is composed of a third coating station (3) for coating the large particle size of the opposite type molding sand than the neutral type molding sand in order to form the outermost surface located on the outermost surface.
The method of claim 1,
The first coating station 1 is a molding sand coating machine 11 for coating the molding sand on the wax model, a dryer 12 for drying the wax model coated with the molding sand, and a molding sand for supplying the molding sand to the molding sand coating machine 11. The feeder 13 and the transfer means 14 for coating the molding sand on the wax model and transferring the wax model, and a wax model processing unit for washing to remove foreign substances from the surface of the wax model, rinsing as a release agent, etc. (15) A precision mold casting sand coating device, characterized in that it consists of.
3. The method of claim 2,
The wax model processing unit 15 is for a treatment operation that must be performed before coating the molding sand. A first rinse tank 152 for removing foreign substances remaining on the surface and a second rinse tank for removing other foreign substances remaining on the wax surface by immersing the wax model treated in the first rinse tank 152 (153) and the washing tank 154 for washing the rinse remaining on the surface of the wax model immersed in the first rinse tank 152 and the second rinse tank 153, and a molding sand may be attached to the surface of the wax model A precision mold casting sand coating device, characterized in that it is composed of a slurry tank (155a) to make it possible.
3. The method of claim 2,
The molding sand feeder 13 is a precision mold molding sand coating device, characterized in that it further includes a stirring member to prevent the molding sand from aggregating.
The method of claim 1,
In the second coating station 2, the molding sand coating of the inner skin part is completed in the first coating station 1, and the molding sand coating machine 21 for coating the molding sand forming an intermediate layer on the wax model transferred from the inside of the dryer 12 ) and a drying machine 22 for transporting and drying the wax model coated with the molding sand from the molding sand coating machine 21 and a molding sand supplying machine 23 for supplying the neutral molding sand to the molding sand coating machine 21 and the process of the wax model An adhesion strengthening unit 251 and the adhesion strengthening unit 251 for increasing surface adhesion before secondary coating of the wax model transferred through the rotary transfer means 24 for transfer and the first coating station 1 A precision casting sand coating apparatus, characterized in that it comprises a slurry tank (255a), a wax model lead-in belt (26a) and a wax model lead-in belt (26b) which are disposed adjacent to the mold sand.
The method of claim 1,
Precision casting sand coating apparatus, characterized in that it further comprises an air conditioner (4) for air conditioning of the dryer connected to the first coating station (1) to the third coating station (3).
The method of claim 1,
A precision casting sand coating apparatus, characterized in that a control unit (5) for controlling the first coating station (1) to the third coating station (3) is further included.
The method of claim 1,
Precision mold casting sand coating device, characterized in that it further comprises a checker for inspecting the completeness of the mold after melting and removing the wax located inside the coated mold.

Images