KR20220040937A - Injection molding machine and manufacturing method of injection molded part using the same - Google Patents

Abstract

Disclosed is a method for manufacturing an injection molded article. The method for manufacturing an injection molded article according to the present invention comprises: (a) a step of air-cooling an injection molded article in a second mold core while injecting a molten material into a cavity formed by a first mold core and a mold cavity; (b) a step in which the cavity formed by the first mold core and the mold cavity is opened; and (c) a step in which a second actuator moves a housing in the Y-axis direction and then a first actuator moves a base in the X-axis direction, thereby allowing the second mold core and the mold cavity to form a cavity.

Description

Injection molding machine and injection molding product manufacturing method using the same

The present invention relates to an injection molding machine and a method for manufacturing an injection molded product using the same, and more particularly, to an injection molding machine configured to manufacture an injection molded product by pressing and solidifying a fluidized molding material into a mold, and to a method for manufacturing an injection molded product using the same .

The injection molding process consists of a filling process in which molten polymer resin flows into the mold, a packing process in which continuous pressure is applied to compensate for volume reduction due to shrinkage, and a cooling process that provides sufficient strength during ejection. It has a cycle consisting of the process, the ejecting process, where the mold is opened and the product is released. Among them, the cooling process occupies about 60% to 80% of the total process time. Therefore, the time reduction of the cooling process is an important factor in terms of productivity improvement.

In this regard, Korean Patent Publication No. 1264893 (hereinafter 'prior literature') discloses an air cooling system for an injection mold and a method therefor. The air cooling system of the injection mold of the prior literature is configured to include a mold opening unit, a supply unit and a control unit.

The mold opening part is configured to separate the upper mold from the lower mold by a predetermined distance when entering the cooling process after the injection process is performed during injection molding.

The supply part is configured to rapidly cool the surface of the cavity of the upper mold and the surface of the injection product by injecting cooling air into the gap between the upper mold and the lower mold opened by the mold opening part.

The supply part consists of an air cooling part, an air injection part, and a controller. The air cooling unit is configured to produce external hot air as cooling air. The air injection unit is connected to the air cooling unit to supply cooling air to the gap between the upper mold and the lower mold generated by the mold opening. The controller is configured to operate the air cooling unit and the air injection unit in conjunction with the control unit.

The control unit is configured to control the supply of cooling water to the lower mold when entering the cooling process during injection molding, and control the mold opening unit and the cooling air supply unit to supply cooling air.

The air cooling method of the injection mold of the prior literature is configured including (a) step, (b) step, (c) step, (d) step, (e) step and (f) step.

Step (a) is a step to prepare for injection molding by closing the upper and lower molds.

And step (b) is a step of supplying and circulating a heating medium to the injection mold in order to satisfy the physical properties of the injection molded product to maintain the high temperature state of the injection mold at a temperature of 100°C to 130°C.

Step (c) is a step of maintaining a constant pressure until the gate of the injection mold is solidified, and filling the cavity of the upper mold with molten resin through the injection machine.

On the other hand, in step (d), the cooling water is supplied to the cooling water hole formed in the lower mold, and the upper mold and the lower mold are spaced apart by a predetermined interval, and cooling air is supplied through the generated gap to the surface of the cavity of the upper mold and the injection product. cooling the surface of

Step (e) is a step of opening the injection mold to take out the solidified molded product.

Finally, step (f) is a step of taking out the injection molding.

The air cooling system and method of the injection mold of the prior literature have an advantage in that the cooling time of the injection mold can be reduced by directly supplying cooling air to the surface of the cavity and the surface of the injection mold.

However, in the air cooling system and method of the injection mold of the prior literature, the cooling air flowing between the upper mold and the lower mold comes into contact with the surface of the injection mold as well as the cavity surface of the injection mold to absorb thermal energy. The heat capacity of the injection mold is much larger than the heat capacity of the injection mold. Therefore, most of the heat energy absorbed by the cooling air flowing between the upper and lower molds is inevitably the heat energy of the injection mold, and there is a problem in that the cooling air absorbs the heat energy of the injection mold very slowly.

In addition, the air cooling system and method of the injection mold of the prior literature supply cooling air to the surface of the cavity and the surface of the injection product through the gap between the upper mold and the lower mold, so that the time required for step (d) can be somewhat reduced, Since a certain amount of time is still required for the cooling process, there is a limit in that the time required for the entire injection molding process cannot be significantly reduced.

On the other hand, the air cooling system and method of the injection mold of the prior literature has a problem in that the cooling rate of the surface of the injection molded product by the cooling air forms a deviation according to the location of the injection molding surface. In step (d), the cooling air introduced between the upper mold and the lower mold gradually absorbs thermal energy and is discharged to the outside through the gap between the upper mold and the lower mold again while the temperature rises.

At this time, the surface of the extruded product near the inlet point of cooling air is cooled rapidly, and the surface of the extruded product near the outlet of the cooling air is cooled slowly. The deviation of the cooling rate of the surface of the injection-molded product causes shrinkage and residual stress of the injection-molded product, and causes a problem in that the defect rate of the injection-molded product increases.

(Prior Document) Republic of Korea Patent Publication No. 1264893 (Registration date: 2013.05.09)

An object to be solved by the present invention is to provide an injection molding machine and a method for manufacturing an injection molded article using the same, which is made to significantly reduce the time required for the entire injection molding process.

An object of the present invention to be solved is to provide an injection molding machine and a method for manufacturing an injection molded product using the same so that the thermal energy of the injection molded product is rapidly released by air cooling.

An object of the present invention to be solved is to provide an injection molding machine and a method for manufacturing an injection molded product using the same so as to prevent the occurrence of a cooling rate deviation for each location of the injection molded product due to air cooling.

The injection molding machine according to an embodiment of the present invention may constitute an injection molding facility together with a cooling device, a heating device, an oil supply device, an air supply device, and a control unit. The control unit may control an injection molding machine, a cooling device, a heating device, an oil supply device, and an air supply device.

The injection molding machine according to an embodiment of the present invention may include an injection mold. The injection mold may form a two-stage mold structure. The injection mold may include a fixed-side mold and a movable-side mold.

The fixed-side mold may include a fixed-side mounting plate, a fixed-side template, a mold cavity, and an air nozzle.

The fixed-side mounting plate may be a plate for fixing the fixed-side mold to the fixing-side mold mounting plate of the injection machine. The fixed-side mounting plate may form a rectangular parallelepiped plate or a block shape.

The stationary side template may be a template with a mold cavity. The fixed side template may form a rectangular parallelepiped block shape. A sprue bush and a guide pin bush can be fixed to the stationary side platen.

The mold cavity may be a portion engaged with the mold core to form a cavity therein. The mold cavity may be coupled to the stationary side template. Alternatively, the mold cavity may be formed integrally with the stationary side template.

The air nozzle may be configured to forcibly eject air toward the injection-molded product in the mold core. The air nozzle may be coupled to the stationary side template. Alternatively, the air nozzle may be formed integrally with the fixed-side template.

The air nozzle may form a plurality of openings open toward the injection molded article in the mold core. The cooled compressed air of the air supply device may be injected toward the injection molded product.

The air nozzle may include a first air nozzle and a second air nozzle.

The first air nozzle may be provided on one side in the Y-axis direction with respect to the mold cavity. When the second mold core and the mold cavity form the cavity, the first air nozzle may be slightly spaced apart from the first mold cavity in the X-axis direction.

The X-axis direction may mean a direction in which the injection mold is opened and closed. The Y-axis direction may mean a direction in which the housing reciprocates by the second actuator. The Y-axis direction may be a direction perpendicular to a direction in which the injection mold is opened and closed. The Z-axis direction may mean a direction parallel to the extension line in the direction of gravity. The Z-axis direction may coincide with an extension line in the direction of gravity. The X-axis direction, the Y-axis direction, and the Z-axis direction may form a right angle to each other.

The second air nozzle may be provided on the other side in the Y-axis direction with respect to the mold cavity. When the first mold core and the mold cavity form the cavity, the second air nozzle may be slightly spaced apart from the second mold cavity in the X-axis direction.

The movable mold may include a base, a housing, a mold core, an ejector pin, and a boundary member.

The base may be configured to reciprocate in the X-axis direction. The base may be reciprocally moved in the X-axis direction by the first actuator. The mold core and the mold cavity may form a cavity by movement of the base in the X-axis direction.

The base may be configured to include a movable side mounting plate and a guide plate.

The movable-side mounting plate may be a plate for fixing the movable-side mold to the movable-side mold mounting plate of the injection machine. The movable side mounting plate may form a rectangular parallelepiped plate or a block shape.

A second actuator may be coupled to the movable side mounting plate. The second actuator may be provided as a hydraulic cylinder. The oil supply device may supply oil to the second actuator through an oil supply pipe.

The guide plate may be coupled to the movable side mounting plate. The guide plate may be provided as a pair. The pair of guide plates may form a rectangular parallelepiped plate or block shape long in the Y-axis direction.

The pair of guide plates may be spaced apart from each other in the Z-axis direction. Rails may be respectively formed on the pair of guide plates. The rail may form a long shape in the Y-axis direction. The housing may be provided between a pair of guide plates. A plurality of sliders that slide along the rails may be coupled to the housing.

The guide plate may guide the movement of the housing in the Y-axis direction. Accordingly, the housing may be slidably moved in the Y-axis direction between the pair of guide plates.

The housing may include an upper plate, a lower plate, a side plate, and a connecting member.

The top plate may be a template with a mold core. The upper plate and the lower plate may be spaced apart from each other in the X-axis direction. The upper plate and the lower plate may form a space therebetween in which the ejector plate reciprocates in the X-axis direction. A pair of side plates can connect the upper plate and the lower plate.

A third actuator and a fourth actuator may be coupled to the lower plate. The oil supply device may supply oil to the third actuator and the fourth actuator through the oil supply pipe, respectively.

The connecting member may be coupled to the upper plate and the lower plate. The piston rod of the second actuator may be coupled to the connecting member. Accordingly, the housing may be reciprocally moved in the Y-axis direction by the second actuator.

The mold core may engage the mold cavity to form a cavity therein. The mold core may be coupled to the upper plate. Alternatively, the mold cavity may be formed integrally with the upper plate.

A plurality of holes through which the ejector pin passes in the X direction may be formed in the upper plate and the mold core.

The mold core may include a first mold core and a second mold core. The first mold core and the second mold core may be spaced apart from each other in the Y-axis direction.

When any one of the first mold core and the second mold core and the mold cavity form a cavity, the other one of the first mold core and the second mold core may be exposed to the air.

Therefore, when the molten material is injected into the cavity formed by any one of the first mold core and the second mold core and the mold cavity, the injection molded article in the other one of the first mold core and the second mold core can be air-cooled.

The plurality of open openings of the air nozzle may face the first mold core or the second mold core exposed to the air. The first air nozzle or the second air nozzle may spray the cooled compressed air toward the injection-molded product in the first mold core or the second mold core.

The ejector pin can push the injection molded product in the mold core in the X-axis direction. The ejector pin may include a first ejector pin and a second ejector pin.

The first ejector pin can push the injection-molded article in the first mold core. The injection-molded article pushed from the first mold core by the first ejector pin may be taken out by dropping in the direction of gravity. The first ejector plate may be reciprocally moved in the X-axis direction by the third actuator.

The second ejector pin can push the injection molded product in the second mold core. The injection-molded article pushed from the second mold core by the second ejector pin may be taken out by dropping in the direction of gravity. The second ejector plate may be reciprocally moved in the X-axis direction by the fourth actuator.

The boundary member may form both boundaries of the Y-axis direction reciprocating movement section of the housing. The boundary member may include a connecting block, a boundary plate, and a contact member.

The connecting block may be coupled to the movable side mounting plate. The connection block may form a rectangular parallelepiped plate or block shape long in the Y-axis direction.

The boundary plate may be coupled to both ends of the connection block in the Y-axis direction. Each contact member may be coupled to the boundary plate. The lower plate may be in close contact with the contact member on both sides of the Y-axis direction reciprocating movement section of the housing.

The injection-molded product manufacturing method according to an embodiment of the present invention may include steps (a), (b), (c), (d), (e) and (f).

Steps (a), (b), (c), (d), (e) and (f) may form one cycle of the injection-molded product manufacturing method according to an embodiment of the present invention. . Steps (a), (b), (c), (d), (e) and (f) may be sequentially performed by the automatic control of the controller.

Step (a) may be a step of air cooling the injection-molded article in the second mold core while injecting the molten material into the cavity formed by the first mold core and the mold cavity. Step (f) of the previous cycle may be performed before step (a).

In step (a), the second air nozzle may forcibly inject cooled air to the injection molded product in the second mold core. Therefore, the molten material injected into the cavity formed by the second mold core and the mold cavity in step (d) of the previous cycle can be rapidly cooled in step (a) of this cycle.

Step (b) may be a step in which the cavity formed by the first mold core and the mold cavity is opened. When step (b) is started, the base may be moved in the X-axis direction by the first actuator so that the cavity formed by the first mold core and the mold cavity is opened.

When step (b) is initiated, the second ejector pin can push the injection molded product on the second mold core. The injection-molded article pushed from the second mold core by the second ejector pin may be taken out by dropping in the direction of gravity.

Step (c) may include a first moving step and a first mold closing process. When step (c) is completed, the second mold core and the mold cavity may form a cavity.

In the first moving step, the housing may be moved in the Y-axis direction by the second actuator. The housing may be moved until the lower plate is in close contact with the contact member.

When the first moving step is completed, the first mold closing process may be started. When the first mold closing process is started, the base may be moved in the X-axis direction by the first actuator so that the second mold core engages with the mold cavity to form the cavity.

Step (d) may be a step of air-cooling the injection-molded article in the first mold core while injecting the molten material into the cavity formed by the second mold core and the mold cavity.

In step (d), the first air nozzle may forcibly inject cooled air to the injection-molded product in the first mold core. The compressed air cooled by the air supply device may be supplied to the first air nozzle through the air supply pipe.

The molten material injected into the cavity formed by the first mold core and the mold cavity in step (a) can be rapidly cooled in step (d) of this cycle.

Step (e) may be a step in which the cavity formed by the second mold core and the mold cavity is opened. When step (e) is started, the base may be moved in the X-axis direction by the first actuator so that the cavity formed by the second mold core and the mold cavity is opened.

When step (e) is initiated, the first ejector pin can push the injection molded product in the first mold core. In this process, the injection-molded article pushed from the first mold core by the first ejector pin may be taken out by dropping in the direction of gravity.

Step (f) may include a second moving step and a second mold closing step. When step (f) is completed, the first mold core and the mold cavity may form a cavity.

In the second moving step, the housing may be moved in the Y-axis direction by the second actuator. The housing may be moved until the lower plate is in close contact with the contact member.

When the second moving step is completed, the second impingement step may be initiated. When the second mold closing step is started, the base may be moved in the X-axis direction by the first actuator so that the first mold core engages with the mold cavity to form the cavity. When step (f) is completed, step (a) of the next cycle may begin.

In the method for manufacturing an injection molded article according to an embodiment of the present invention, while the injection process and the mold opening process are performed based on the first mold core in step (a), the cooling process, the ejection process and the mold closing process are performed based on the second mold core. The process may be performed.

And, in the method for manufacturing an injection molded article according to an embodiment of the present invention, while the injection process and the mold opening process are performed based on the second mold core in step (d), the cooling process, the ejection process, and the A mold closing process may be performed.

That is, in the method for manufacturing an injection molded article according to an embodiment of the present invention, the injection process, the mold opening process, the cooling process, the ejection process, and the mold closing process may be performed twice during one cycle.

In addition, in the step (a) and (d) of the method for manufacturing an injection molded product according to an embodiment of the present invention, by directly spraying the cooled compressed air to the injection molded product in a state that the mold cavity is spaced apart from the mold core, the cooling process of the The process time can be significantly reduced.

According to an embodiment of the present invention, when steps (a) and (d) are completed, the mold cavity is immediately separated from the mold core to block the transfer of thermal energy between the mold cavity and the injection-molded product, and then steps (a) and ( In step d), the thermal energy of the injection-molded product can be rapidly discharged by the compressed air injected toward the injection-molded product.

According to an embodiment of the present invention, during one cycle of injection molding, the injection process, the mold opening process, the mold opening process, the cooling process, and the ejection process are performed twice, so that during one cycle of injection molding, the injection process and cooling process are performed. It is possible to increase the production rate by more than twice compared to the conventional injection molded product manufacturing method in which the process, the mold opening process, the ejection process, and the mold closing process are performed once.

According to the embodiment of the present invention, in a state that the mold cavity is spaced apart from the mold core, the air nozzle provided in the fixed side mold directly sprays the cooled compressed air toward the injection molded product, so that the same from the middle part to the edge part of the injection molded product It can be cooled at a cooling rate.

1 is a schematic diagram showing an injection molding equipment including an injection molding machine according to an embodiment of the present invention.
2 is a flowchart illustrating a method for manufacturing an injection-molded article according to an embodiment of the present invention.
3 is a perspective view illustrating a mold closing state of the injection mold of the injection molding machine of FIG. 1 .
4 is a perspective view illustrating a mold opening state of the injection mold of the injection molding machine of FIG. 1 .
FIG. 5 is a cross-sectional view taken along line AA′ of the injection mold of FIG. 2 , and is a view showing step (a) of the method for manufacturing the injection molded product of FIG. 4 .
FIG. 6 is a cross-sectional view taken along line BB′ of the injection mold of FIG. 3 , and is a view showing step (b) of the method for manufacturing the injection molded product of FIG. 4 .
7 is a cross-sectional view of the injection mold, and is a view showing the Y-axis movement of the housing in step (c) of the injection molded product manufacturing method of FIG.
8 is a cross-sectional view of the injection mold, and is a view showing the movement in the X-axis direction of the base in step (c) of the injection-molded product manufacturing method of FIG.
9 is a cross-sectional view of the injection mold, and is a view showing step (d) of the injection-molded product manufacturing method of FIG.
10 is a cross-sectional view of an injection mold, and is a view showing step (e) of the injection-molded product manufacturing method of FIG.
11 is a cross-sectional view of the injection mold, and is a view showing the Y-axis movement of the housing in step (f) of the injection molded product manufacturing method of FIG.
12 is a cross-sectional view of the injection mold, and is a view showing the movement in the X-axis direction of the base in step (f) of the injection molded product manufacturing method of FIG.
13 is a graph comparing the injection-molded product manufacturing method of FIG. 4 and the conventional injection-molded product manufacturing method based on the process time.
14 is a graph comparing one cycle of the injection-molded product manufacturing method of FIG. 4 based on the process time.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in describing the present invention, descriptions of already known functions or configurations will be omitted in order to clarify the gist of the present invention.

1 is a schematic diagram showing an injection molding equipment 1000 including an injection molding machine 1 according to an embodiment of the present invention.

1, the injection molding machine 1 according to an embodiment of the present invention includes a cooling device 3, a heating device 2, an oil supply device 4, an air supply device 5, and a control unit ( 300) together with the injection molding equipment 1000 may be configured.

The cooling device 3 is a device for re-cooling and reuse of cooling water whose temperature has increased by heat exchange with the mold. The cooling device 3 may include a cooling tower and a water pump.

The cooling tower is a heat exchange device that cools the cooling water, which has increased in temperature after use, by directly connecting it with outdoor air for reuse. Water in the cooling tower may move to the internal flow path in the injection mold 10 by the pressure of the water pump.

After heat exchange with the injection mold 10 , the water may be introduced into the cooling tower again. Since the cooling tower and the water pump are well-known technologies, a detailed description thereof will be omitted.

The heating device 2 is a device for re-heating and reuse of hot water whose temperature has been lowered by heat exchange with the injection mold 10 . The heating device 2 may include a boiler and a water pump.

A boiler is a device that heats water to generate hot water and supplies hot water. Boilers can heat water by means of fire, combustion gas or electrical energy. Water from the boiler may move to the flow path in the injection mold 10 by the pressure of the water pump. Since the boiler is a well-known technology, a detailed description thereof will be omitted.

Oil Supply Equipment (4) is literally a mechanical device that supplies oil. The oil supply device 4 may include an oil pump, an oil filter, an oil supply pipe T2 , an oil cooling device 3 , an oil passage, and the like.

The oil supply device 4 supplies oil to the second actuator A2 , the third actuator A3 , and the fourth actuator A4 to be described later, respectively. Since the oil supply device 4 is a well-known technology, a detailed description thereof will be omitted.

Air supply device (5; Air Supply Equipment) is a device for supplying cooled compressed air. As disclosed in Korean Patent Publication Nos. 1962681 and 1970289, a device for supplying cooled compressed air to a production line is a well-known technology, so a detailed description thereof will be omitted.

An injection molding machine (1) is literally a molding machine used for injection molding. The injection molding machine 1 heats and melts the plastic, and then injects it into the injection mold 10 at high pressure to cool and solidify the plastic while maintaining the pressure.

The injection molding machine 1 may be provided with a plunger type molding machine, a screw pre-plasticizing type molding machine, an inline screw type molding machine, or a vent type molding machine.

1 illustrates a plunger-type molding machine as an example. Reference numeral 20 in FIG. 1 denotes a hopper of the plunger-type molding machine, 30 denotes a barrel, and 40 denotes a clamping unit. Since the plunger-type molding machine is a well-known technology, a detailed description thereof will be omitted.

The control unit 300 controls the injection molding machine 1 , the cooling device 3 , the heating device 2 , the oil supply device 4 , and the air supply device 5 . The control unit 300 may be provided in the injection molding machine 1 .

Alternatively, the control unit 300 may be provided outside the injection molding machine 1 . That is, the control unit 300 is a control panel that exchanges signals with the injection molding machine 1, the cooling device 3, the heating device 2, the oil supply device 4, and the air supply device 5, respectively. may be

2 is a flowchart illustrating a method ( S100 ) of manufacturing an injection-molded article according to an embodiment of the present invention.

3 is a perspective view illustrating a mold closing state of the injection mold 10 of the injection molding machine 1 of FIG. 1 . FIG. 4 is a perspective view showing a mold opening state of the injection mold 10 of the injection molding machine 1 of FIG. 1 .

Hereinafter, the direction in which the injection mold 10 is opened and closed is referred to as the X-axis direction for easy understanding of the present invention. And the direction in which the housing 220 reciprocates by the second actuator A2 is referred to as the Y-axis direction. The X-axis direction and the Y-axis direction may form a right angle to each other.

A direction forming a right angle to the X-axis direction and the Y-axis direction, respectively, is intended to be referred to as the Z-axis direction. In a state in which the injection mold 10 is installed in the injection molding machine 1 , the Z-axis direction may coincide with the extension line in the gravity direction. And the X-axis direction and the Y-axis direction may form a right angle to the direction of gravity, respectively.

As shown in Figure 2, the injection molded article manufacturing method (S100) according to an embodiment of the present invention (a) step (S110), (b) step (S120), (c) step (S130, S140), (d) step (S150), (e) step (S160) and (f) may be configured to include steps (S170, S180).

(a) Step S110 is a step in which the injection process (pressure-holding process) on the side of the first mold core 231 and the cooling process on the side of the second mold core 232 are simultaneously performed.

(b) Step S120 is a step in which the mold opening process on the side of the first mold core 231 and the extraction process on the side of the second mold core 232 are simultaneously performed.

(c) Steps S130 and S140 are steps in which the mold core 230 moves and the mold closing process on the second mold core 232 side is performed.

Step (d) ( S150 ) is a step in which the injection process (pressure holding process) on the side of the second mold core 232 and the cooling process on the side of the first mold core 231 are simultaneously performed.

(e) Step S160 is a step in which the second mold core 232 side mold opening process and the first mold core 231 side takeout process are simultaneously performed.

(f) Steps S170 and S180 are steps in which the mold core 230 is moved and the mold closing process on the side of the first mold core 231 is performed.

The injection-molded article manufacturing method S100 according to an embodiment of the present invention is implemented through the injection molding machine 1 according to an embodiment of the present invention. Hereinafter, the injection-molded product manufacturing method ( S100 ) and the injection molding machine ( 1 ) will be simultaneously described in order to facilitate understanding of the present invention.

FIG. 5 is a cross-sectional view taken along line A-A' of the injection mold 10 of FIG. 2 , and is a view showing step (a) ( S110 ) of the method ( S100 ) of manufacturing the injection molded article of FIG. 4 .

FIG. 6 is a cross-sectional view taken along line B-B' of the injection mold 10 of FIG. 3 , and is a view showing step (b) ( S120 ) of the method ( S100 ) for manufacturing an injection molded article of FIG. 4 .

3 and 4 , the injection mold 10 may include a fixed-side mold 100 and a movable-side mold 200 . That is, the injection mold 10 may form a two-stage mold structure.

4 and 6 , the fixed-side mold 100 may be configured to include a fixed-side mounting plate 110 , a fixed-side template 120 , a mold cavity 130 and an air nozzle 140 . there is.

The fixed-side mounting plate 110 is a plate for fixing the fixed-side mold 100 to the fixing-side mold 100 attachment plate of the injection molding machine. The fixed-side mounting plate 110 may form a rectangular parallelepiped plate or a block shape. Since the fixed side mounting plate 110 and the mold attachment plate are known technologies, detailed description thereof will be omitted.

The sprue bush 111 may be coupled to the fixed side mounting plate 110 . The sprue bush 111 forms a sprue. In injection molding of plastics, sprue refers to the part of the passage through which the molten material discharged from the nozzle passes. The sprue may mean an intermediate part between the nozzle and the runner.

The fixed side template 120 is a template with the mold cavity 130 . The fixed-side template 120 may form a rectangular parallelepiped block shape.

The sprue bush 111 and the guide pin bush may be fixed to the fixed side template 120 . The sprue bush 111 forms a hole through which the molten material enters the runner. The guide pin bush serves as a bearing of the guide pin (212P) provided on the movable side template.

The mold cavity 130 is a part engaged with the mold core 230 to form a cavity therein. The mold cavity 130 and the mold core 230 are in close contact along a parting line to form a cavity. The mold cavity 130 may be coupled to the fixed-side template 120 . Alternatively, the mold cavity 130 may be formed integrally with the fixed-side template 120 .

7 is a cross-sectional view of the injection mold 10, and is a view showing the Y-axis movement (S130) of the housing 220 in the (c) step (S130, S140) of the injection molded product manufacturing method (S100) of FIG.

8 is a cross-sectional view of the injection mold 10, and is a view showing the X-axis movement (S140) of the base 210 in the (c) step (S130, S140) of the injection molded product manufacturing method (S100) of FIG.

9 is a cross-sectional view of the injection mold 10, and is a view showing the (d) step (S150) of the injection-molded article manufacturing method (S100) of FIG.

As shown in FIG. 5 , the air nozzle 140 is configured to forcibly eject air toward the injection-molded product 1P in the mold core 230 . The air nozzle 140 may be coupled to the fixed-side template 120 . Alternatively, the air nozzle 140 may be formed integrally with the fixed-side template 120 .

The air nozzle 140 forms a plurality of openings open toward the injection-molded product 1P in the mold core 230 . A flow path 121 through which air moves may be formed in the fixed-side template 120 . The flow path 121 is connected to the air supply pipe T1. The air supply pipe (T1) is connected to the air supply device (5).

The compressed air cooled by the air supply device 5 is injected toward the injection molded product 1P through the air supply pipe T1 , the flow path 121 , and the air nozzle 140 . The air supply pipe T1 may be made of a flexible material.

5 and 9 , the air nozzle 140 is configured to include a first air nozzle 141 and a second air nozzle 142 .

As shown in FIG. 9 , the first air nozzle 141 is provided on one side in the Y-axis direction with respect to the mold cavity 130 . When the second mold core 232 and the mold cavity 130 form a cavity, the first air nozzle 141 is somewhat spaced apart from the first mold cavity 130 in the X-axis direction.

In this state, the first air nozzle 141 may inject the cooled compressed air toward the injection-molded product 1P in the first mold core 231 .

As shown in FIG. 5 , the second air nozzle 142 is provided on the other side in the Y-axis direction with respect to the mold cavity 130 . That is, the second air nozzle 142 is provided on the opposite side of the first air nozzle 141 with respect to the mold cavity 130 .

When the first mold core 231 and the mold cavity 130 form a cavity, the second air nozzle 142 is somewhat spaced apart from the second mold cavity 130 in the X-axis direction. In this state, the second air nozzle 142 may inject the cooled compressed air toward the injection-molded product 1P in the second mold core 232 .

The controller 300 controls the air nozzle 140 to forcibly inject air toward the injection-molded product 1P in the first mold core 231 and the second mold core 232 .

For example, an on/off valve is installed in the air supply pipe T1 or the flow path 121 on the first air nozzle 141 side, and an on/off valve is installed in the air supply pipe T1 or the flow path 121 on the second air nozzle 142 side. can be installed.

The control unit 300 controls the operation of the opening/closing valve on the first air nozzle 141 side and the opening/closing valve on the second air nozzle 142 side in conjunction with the progress of the injection process (pressure holding process), the cooling process, the mold opening process, and the ejection process. can do.

4 and 6 , the movable mold 200 may include a base 210 , a housing 220 , a mold core 230 , an ejector pin 240 , and a boundary member 250 . can

The base 210 is configured to reciprocate in the X-axis direction. The X-axis direction is a direction in which the injection mold 10 is mold-opened and mold-closed. The mold core 230 and the mold cavity 130 may form a cavity by movement of the base 210 in the X-axis direction. The base 210 may include a movable side mounting plate 211 and a guide plate 212 .

The movable-side mounting plate 211 is a plate for fixing the movable-side mold 200 to the movable-side mold 200 attachment plate of the injection machine. The movable side mounting plate 211 may form a rectangular parallelepiped plate or a block shape. Since the movable side mounting plate 211 and the mold attachment plate are known technologies, detailed description thereof will be omitted.

The base 210 is reciprocally moved in the X-axis direction by the first actuator A1. The first actuator A1 may be provided as a hydraulic cylinder. A piston rod of the hydraulic cylinder may be coupled to an attachment plate of the mold 200 on the movable side of the injection machine.

The second actuator A2 is coupled to the movable side mounting plate 211 . The second actuator A2 may be provided as a hydraulic cylinder. A piston rod of the hydraulic cylinder may be coupled to the housing 220 . The housing 220 is reciprocally moved in the Y-axis direction by the second actuator A2.

The oil supply device 4 supplies oil to the second actuator A2 through the oil supply pipe T2. The piston rod of the second actuator A2 reciprocates in the Y-axis direction by the oil supplied from the oil supply device 4 . Even if the base 210 and the housing 220 reciprocate, the oil supply pipe T2 may be made of a flexible material so that oil can be smoothly supplied.

3 and 4 , the guide plate 212 is coupled to the movable side mounting plate 211 . The guide plate 212 is provided as a pair. A pair of guide plates 212 may form a rectangular parallelepiped plate or block shape long in the Y-axis direction.

A pair of guide plates 212 are spaced apart from each other in the Z-axis direction. Rails 212R are respectively formed on the pair of guide plates 212 . The rail 212R forms a long shape in the Y-axis direction. The housing 220 is provided between a pair of guide plates 212 . A plurality of sliders 221S that slide along the rail 212R are coupled to the housing 220 .

For example, the rail 212R may form a long groove shape in the Y-axis direction. In addition, the slider 221S may be slidably inserted into the groove. Accordingly, the housing 220 may slide between the pair of guide plates 212 in the Y-axis direction. That is, the guide plate 212 guides the movement of the housing 220 in the Y-axis direction.

As shown in FIG. 6 , the guide pin 212P is coupled to the guide plate 212 . When the injection mold 10 is closed, the guide pin 212P is inserted into the guide pin bush. The guide pin 212P and the guide pin bush serve to align the fixed-side mold 100 and the movable-side mold 200 . Since the guide pin 212P and the guide pin bush are well-known technologies, a detailed description thereof will be omitted.

6 and 7 , the housing 220 may include an upper plate 221 , a lower plate 222 , a side plate 223 , and a connection member 224 .

The upper plate 221 is a template with the mold core 230 . A plurality of holes through which the ejector pin 240 passes in the X direction are formed in the upper plate 221 .

The third actuator A3 and the fourth actuator A4 are coupled to the lower plate 222 . The oil supply device 4 supplies oil to the third actuator A3 and the fourth actuator A4 through the oil supply pipe T2, respectively.

The piston rods of the third actuator A3 and the fourth actuator A4 are reciprocally moved in the X-axis direction by the oil supplied from the oil supply device 4 . Even if the base 210 and the housing 220 reciprocate, the oil supply pipe T2 may be made of a flexible material so that oil can be smoothly supplied.

The upper plate 221 and the lower plate 222 are spaced apart from each other in the X-axis direction. The upper plate 221 and the lower plate 222 may form a rectangular parallelepiped plate or block shape. The upper plate 221 and the lower plate 222 form a space therebetween in which the ejector plate reciprocates in the X-axis direction. The slider 221S may be respectively coupled to the upper plate 221 and the lower plate 222 .

As shown in FIG. 4 , a pair of side plates 223 connects the upper plate 221 and the lower plate 222 . A pair of side plates 223 are spaced apart from each other in the Z-axis direction. The ejector plate is disposed between a pair of side plates 223 .

6 and 7 , the connecting member 224 is coupled to the upper plate 221 and the lower plate 222 . A piston rod of the second actuator A2 is coupled to the connecting member 224 . Accordingly, the housing 220 is reciprocally moved in the Y-axis direction by the second actuator A2.

10 is a cross-sectional view of the injection mold 10, and is a view showing the (e) step (S160) of the injection-molded article manufacturing method (S100) of FIG.

11 is a cross-sectional view of the injection mold 10, showing the Y-axis movement of the housing 220 in the (f) step (S170, S180) of the injection molded product manufacturing method (S100) of FIG.

12 is a cross-sectional view of the injection mold 10, and is a view showing the movement of the base 210 in the X-axis direction of the (f) step (S170, S180) of the injection molded product manufacturing method (S100) of FIG.

As shown in FIG. 8 , the mold core 230 is a part engaged with the mold cavity 130 to form a cavity therein. The mold cavity 130 and the mold core 230 are in close contact along a parting line to form a cavity.

The mold core 230 may be coupled to the upper plate 221 . Alternatively, the mold cavity 130 may be formed integrally with the upper plate 221 .

The mold core 230 includes a first mold core 231 and a second mold core 232 .

The first mold core 231 and the second mold core 232 are spaced apart from each other in the Y-axis direction. The first mold core 231 and the second mold core 232 may be integrally manufactured. Alternatively, the first mold core 231 and the second mold core 232 may be respectively manufactured and coupled to the upper plate 221 . A plurality of holes through which the ejector pin 240 passes in the X direction are formed in the upper plate 221 and the mold core 230 .

The first mold core 231 and the second mold core 232 are alternately engaged with the mold cavity 130 by reciprocating movement of the housing 220 in the Y-axis direction to alternately form cavities. That is, when either one of the first mold core 231 and the second mold core 232 and the mold cavity 130 form a cavity, the other of the first mold core 231 and the second mold core 232 . One is exposed to air.

Therefore, when the molten material is injected into the cavity formed by any one of the first mold core 231 and the second mold core 232 and the mold cavity 130, the first mold core 231 and the second mold core ( 232), the injection molded article 1P in the other one may be air cooled.

8 and 12 , the plurality of open openings of the air nozzle 140 face the first mold core 231 or the second mold core 232 exposed to the air.

5 and 9, in this state, the first air nozzle 141 or the second air nozzle 142 is an injection-molded product in the first mold core 231 or the second mold core 232 ( Cooled compressed air can be sprayed toward 1P).

The controller 300 controls the air nozzle 140 to forcibly inject air toward the injection-molded product 1P in the first mold core 231 and the second mold core 232 .

Flow paths (not shown) may be formed in the first mold core 231 and the second mold core 232 , respectively. The flow paths are respectively connected to the water supply pipe T3. Even if the base 210 and the housing 220 reciprocate, the water supply pipe T3 may be made of a flexible material so that cooling water and hot water are smoothly supplied.

The hot water of the heating device 2 may move to a flow path in the injection mold 10 through any one of the water supply pipes T3 . The hot water of the heating device 2 may be introduced into the boiler of the heating device 2 again after heat exchange with the injection mold 10 .

The cooling water of the cooling device 3 may move to a flow path in the injection mold 10 through the other water supply pipe T3 . The cooling water of the cooling device 3 may be introduced into the cooling tower of the cooling device 3 again after heat exchange with the injection mold 10 .

A technique for heating or cooling the injection mold 10 by supplying hot water or cooling water to the internal flow path of the injection mold 10 is a well-known technique, and thus a further detailed description will be omitted.

6 and 10 , the ejector pin 240 is configured to push the injection-molded product 1P in the mold core 230 in the X-axis direction. The ejector pin 240 includes a first ejector pin 241 and a second ejector pin 242 .

As shown in FIG. 10 , the first ejector pin 241 is configured to push the injection-molded product 1P in the first mold core 231 . The injection-molded product 1P pushed from the first mold core 231 by the first ejector pin 241 may be taken out by falling in the direction of gravity.

One of the first ejector pins 241 is fixed to the first ejector plate 241P. A return pin, a sprue lock pin, or the like may be further fixed to the first ejector plate 241P.

The first ejector plate 241P may reciprocate in the X-axis direction by the third actuator A3. The third actuator A3 may be fixed to the lower plate 222 . The third actuator A3 may be provided as a hydraulic cylinder. A piston rod of the hydraulic cylinder may be coupled to the first ejector plate 241P.

As shown in FIG. 6 , the second ejector pin 242 is configured to push the injection-molded product 1P in the second mold core 232 . The injection-molded product 1P pushed from the second mold core 232 by the second ejector pin 242 may be taken out by falling in the direction of gravity.

One of the second ejector pins 242 is fixed to the second ejector plate 242P. A return pin, a sprue lock pin, or the like may be further fixed to the second ejector plate 242P.

The second ejector plate 242P may reciprocate in the X-axis direction by the fourth actuator A4. The fourth actuator A4 may be fixed to the lower plate 222 . The fourth actuator A4 may be provided as a hydraulic cylinder. A piston rod of the hydraulic cylinder may be coupled to the second ejector plate 242P.

As shown in FIG. 4 , the boundary member 250 is configured to form both boundaries of the Y-axis direction reciprocating movement section of the housing 220 . The boundary member 250 may be provided as a pair. A pair of boundary members 250 are spaced apart from each other in the Z-axis direction.

The boundary member 250 includes a connection block 251 , a boundary plate 252 , and a contact member 253 .

The connection block 251 is coupled to the movable side mounting plate 211 . The connection block 251 may form a rectangular parallelepiped plate or block shape long in the Y-axis direction. The connection block 251 and the lower plate 222 are spaced apart from each other in the X-axis direction.

The boundary plate 252 is coupled to both ends of the connection block 251 in the Y-axis direction. A contact member 253 is coupled to the boundary plate 252, respectively. The contact member 253 may be provided as a bolt protruding from the boundary plate 252 toward the lower plate 222 .

As shown in FIGS. 10 and 11 , the lower plate 222 may be in close contact with the contact member 253 at both sides of the Y-axis direction reciprocating movement section of the housing 220 , respectively. In this state, when the first actuator A1 reciprocates the base 210 in the X-axis direction, the first mold core 231 or the second mold core 232 engages with the mold cavity 130 to form a cavity. do.

Hereinafter, the injection-molded article manufacturing method ( S100 ) according to an embodiment of the present invention will be described in detail. Configurations of the above-described injection mold 10 may be understood in more detail through the description of the injection-molded product manufacturing method ( S100 ).

13 is a graph comparing the injection-molded product manufacturing method ( S100 ) of FIG. 4 and the conventional injection-molded product manufacturing method based on the process time. 14 is a graph comparing one cycle of the injection-molded article manufacturing method (S100) of FIG. 4 based on the process time.

PRIOR of FIG. 13 is a graph showing an example of time for each of the injection process, the holding pressure process, the cooling process, the mold opening process, the ejection process, and the mold closing process of the conventional injection molded product manufacturing method.

Referring to the PRIOR of FIG. 13 , in the injection process, the mold closing process, the injection process, the holding pressure process, the cooling process, the mold opening process, and the ejection process form one cycle. The cycle of the injection process is repeated.

When the cavity is filled in the injection process, the pressure holding process and the cooling process are sequentially performed. The packing process is a process that compensates for the shrinkage of the resin in the cavity. The resin residue remaining in the melt chamber at the tip of the injection molding machine is highly compressed by the ram of the injection molding machine, and then transferred to the injection mold.

In general, the product is solidified by rapidly cooling the injection mold to a temperature at which the injection molded product can be taken out in the cooling process.

To improve the productivity of the cooling process, the cooling time should be minimized. However, when the temperature of the injection-molded product is high or the injection-molded product is cooled unevenly in the ejection process, torsional deformation occurs in the ejected injection-molded product.

In the PRIOR of FIG. 13, the time required for each process of injection molding of the conventionally produced product (push button of a vacuum cleaner) produced by the present applicant is written.

That is, it takes 3.5 seconds for the injection and holding pressure process, 14.0 seconds for the cooling process, 3.0 seconds for the mold opening process, 2.5 seconds for the ejection process, and 3.0 seconds for the mold closing process. One cycle of the entire injection process takes 26.0 seconds.

Referring to the PRIOR of FIG. 13 , it can be confirmed that the cooling process takes more than half of the total injection process time. In order to improve the productivity of injection molding, it is required to reduce the cooling time.

As shown in Figure 2, the injection molded article manufacturing method (S100) according to an embodiment of the present invention (a) step (S110), (b) step (S120), (c) step (S130, S140), (d) step (S150), (e) step (S160) and (f) may be configured to include steps (S170, S180).

(a) step (S110), (b) step (S120), (c) step (S130, S140), (d) step (S150), (e) step (S160) and (f) step (S170, S180) ) forms one cycle of the injection-molded product manufacturing method (S100) according to an embodiment of the present invention.

(a) step (S110), (b) step (S120), (c) step (S130, S140), (d) step (S150), (e) step (S160) and (f) step (S170, S180) ) may be sequentially performed by automatic control of the control unit 300 .

13 (A) and (B) are (a) step (S110), (b) step (S120) and (c) step (S130) of the injection-molded article manufacturing method (S100) according to an embodiment of the present invention; S140) It is a graph showing each time.

14 (A) and (B) are (a) step (S110), (b) step (S120), (c) step (S130) of the injection molded article manufacturing method (S100) according to an embodiment of the present invention; S140), (d) step (S150), (e) step (S160) and (f) step (S170, S180) is a graph showing the time of each.

13 and 14(A) show each process based on the first mold core 231 . 13 and 14B show each process based on the second mold core 232 .

As shown in FIGS. 5 and 14 , (a) step (S110) injects a molten material into the cavity formed by the first mold core 231 and the mold cavity 130, and the second mold core 232. It is a step of air-cooling the injection molded product (1P) in the

The injection molded product 1P in the second mold core 232 means the molten material injected into the cavity formed by the second mold core 232 and the mold cavity 130 in step (S150) of (d) of the previous cycle. do.

(a) In step S110, the first mold core 231 may be heated by the hot water supplied from the heating device 2 . The hot water of the heating device 2 may be supplied to the internal flow path of the first mold core 231 through the water supply pipe T3 .

And (a) in step ( S110 ), the second mold core 232 may be cooled by the cooling water of the cooling device 3 . The cooling water of the cooling device 3 may be supplied to the internal flow path of the second mold core 232 through a separate water supply pipe T3 .

It should be understood that before (a) step (S110), (f) steps (S170, S180) of the previous cycle are performed.

That is, as shown in FIGS. 11 and 12, (a) before step S110, the second actuator A2 is connected to the housing ( 220) is moved in the Y-axis direction, and then the first actuator A1 moves the base 210 in the X-axis direction.

(a) In step (S110), the second air nozzle 142 forcibly injects cooled air to the injection-molded product 1P in the second mold core 232 . The compressed air cooled by the air supply device 5 may be supplied to the second air nozzle 142 through the air supply pipe T1.

The molten material injected into the cavity formed by the second mold core 232 and the mold cavity 130 in (d) step (S150) of the previous cycle is rapidly cooled in (a) step (S110) of this cycle.

6 and 14 , (b) step S120 is a step in which the cavity formed by the first mold core 231 and the mold cavity 130 is opened. (b) When step S120 is started, the base 210 is moved in the X-axis direction by the first actuator A1 so that the cavity formed by the first mold core 231 and the mold cavity 130 is opened. will do

(b) When step S120 is started, the second ejector pin 242 pushes the injection-molded product 1P in the second mold core 232 . The oil supply device 4 supplies oil to the fourth actuator A4 through the oil supply pipe T2. The piston rod of the fourth actuator A4 reciprocates in the X-axis direction by the oil supplied from the oil supply device 4 .

The second ejector plate 242P is reciprocally moved in the X-axis direction by the fourth actuator A4. In this process, the injection-molded product 1P pushed from the second mold core 232 by the second ejector pin 242 may fall in the direction of gravity and be taken out.

(b) When step S120 is started, the first mold core 231 may be cooled by the cooling water supplied from the cooling device 3 . The cold water of the cooling device 3 may be supplied to the internal flow path of the first mold core 231 through the water supply pipe T3 . (e) Until just before step S160 is completed, the first mold core 231 may be cooled by the cooling water of the cooling device 3 .

(b) Before step S120 is started, the second mold core 232 may be heated by the hot water of the heating device 2 . The hot water of the heating device 2 may be supplied to the internal flow path of the second mold core 232 through a separate water supply pipe T3 . (e) Until step S160 is started, the second mold core 232 may be heated by the hot water of the heating device 2 .

7, 8, and 14, (c) steps (S130, S140), the second actuator (A2) moving the housing 220 in the Y-axis direction (S130; hereinafter 'first') 1 moving step (S130)'), and a step (S140) of the first actuator A1 moving the base 210 in the X-axis direction (hereinafter, 'first mold closing process (S140)'). (c) When steps S130 and S140 are completed, the second mold core 232 and the mold cavity 130 form a cavity.

As shown in FIG. 7 , in the first moving step S130 , the oil supply device 4 supplies oil to the second actuator A2 through the oil supply pipe T2 . The piston rod of the second actuator A2 is moved in the Y-axis direction by the oil supplied from the oil supply device 4 .

Accordingly, the housing 220 is moved in the Y-axis direction by the second actuator A2. The housing 220 may be moved until the lower plate 222 is in close contact with the contact member 253 . When the first moving step (S130) is completed, the first mold closing process (S140) is started.

As shown in FIG. 8 , when the first mold closing process S140 is started, the base 210 is operated by the first actuator A1 so that the second mold core 232 is engaged with the mold cavity 130 to form a cavity. moves in the X-axis direction.

After the guide pin 212P is inserted into the guide pin bush in the first mold closing process ( S140 ), the second mold core 232 and the mold cavity 130 are engaged to form a cavity.

As shown in FIGS. 9 and 14, (d) step (S150) injects a molten material into the cavity formed by the second mold core 232 and the mold cavity 130, while the first mold core 231 It is a step of air-cooling the injection molded product (1P) in the

The injection-molded product 1P in the first mold core 231 refers to the molten material injected into the cavity formed by the first mold core 231 and the mold cavity 130 in step (a) ( S110 ).

(d) In step (S150), the second mold core 232 may be heated by the hot water supplied from the heating device (2). The hot water of the heating device 2 may be supplied to the internal flow path of the second mold core 232 through the water supply pipe T3 .

And (d) in step S150 , the first mold core 231 may be cooled by the cooling water of the cooling device 3 . The cooling water of the cooling device 3 may be supplied to the internal flow path of the first mold core 231 through a separate water supply pipe T3 .

(d) In step (S150), the first air nozzle 141 forcibly injects cooled air to the injection-molded product 1P in the first mold core 231 . The compressed air cooled by the air supply device 5 may be supplied to the first air nozzle 141 through the air supply pipe T1.

The molten material injected into the cavity formed by the first mold core 231 and the mold cavity 130 in step (a) (S110) is rapidly cooled in step (d) (S150) of this cycle.

10 and 14 , (e) step S160 is a step in which the cavity formed by the second mold core 232 and the mold cavity 130 is opened. (e) When step S160 is started, the base 210 is moved in the X-axis direction by the first actuator A1 so that the cavity formed by the second mold core 232 and the mold cavity 130 is opened. will do

(e) When step S160 is started, the first ejector pin 241 pushes the injection-molded product 1P in the first mold core 231 . The oil supply device 4 supplies oil to the third actuator A3 through the oil supply pipe T2. The piston rod of the third actuator A3 is reciprocally moved in the X-axis direction by the oil supplied from the oil supply device 4 .

The second ejector plate 242P is reciprocally moved in the X-axis direction by the third actuator A3. In this process, the injection-molded product 1P pushed from the first mold core 231 by the first ejector pin 241 may fall in the direction of gravity and be taken out.

(e) When step S160 is started, the second mold core 232 may be cooled by the cooling water supplied from the cooling device 3 . The cold water of the cooling device 3 may be supplied to the internal flow path of the second mold core 232 through the water supply pipe T3 . (b) Right before step S120 is completed, the second mold core 232 may be cooled by the cooling water of the cooling device 3 .

(e) Before step S160 is started, the first mold core 231 may be heated by the hot water of the heating device 2 . The hot water of the heating device 2 may be supplied to the internal flow path of the first mold core 231 through a separate water supply pipe T3 . (b) Before step S120 is started, the first mold core 231 may be heated by the hot water of the heating device 2 .

11, 12 and 14, (f) step (S170, S180), the second actuator (A2) moving the housing 220 in the Y-axis direction (S170 or less 'second It includes a moving step (S170)') and a step of the first actuator A1 moving the base 210 in the X-axis direction (hereinafter referred to as 'second mold closing step (S180)').

(f) When steps S170 and S180 are completed, the first mold core 231 and the mold cavity 130 form a cavity.

11 , in the second moving step S170 , the oil supply device 4 supplies oil to the second actuator A2 through the oil supply pipe T2 . The piston rod of the second actuator A2 is moved in the Y-axis direction by the oil supplied from the oil supply device 4 .

Accordingly, the housing 220 is moved in the Y-axis direction by the second actuator A2. The housing 220 may be moved until the lower plate 222 is in close contact with the contact member 253 . When the second moving step (S170) is completed, the second mold closing step (S180) is started.

As shown in FIG. 12 , when the second mold closing step S180 is started, the base 210 is operated by the first actuator A1 so that the first mold core 231 is engaged with the mold cavity 130 to form a cavity. moves in the X-axis direction.

After the guide pin 212P is inserted into the guide pin bush in the second mold closing step S180, the first mold core 231 and the mold cavity 130 are engaged to form a cavity.

As shown in FIG. 2 , when steps (S170 and S180) (f) are completed, it is checked whether a stop signal for injection molding is received. When the stop signal is received, the injection molding is finished.

If the stop signal is not received, step (a) of the next cycle (S110) is started. That is, as shown in FIG. 7 , while injecting the molten material into the cavity formed by the first mold core 231 and the mold cavity 130 , the injection molded product 1P in the second mold core 232 is air cooled. will make it

14, (a) step (S110), (b) step (S120), (c) step (S130, S140), (d) step (S150), (e) step (S160) and (f) Steps (S170, S180) form one cycle of the injection-molded article manufacturing method (S100) according to an embodiment of the present invention.

13, the injection-molded product manufacturing method (S100) according to an embodiment of the present invention further performs the first moving step (S130) and the second moving step (S170), which are not in the conventional injection-molded product manufacturing method do.

Accordingly, in the method (S100) for manufacturing an injection molded article according to an embodiment of the present invention, while the injection process (pressing process) and the mold opening process are performed based on the first mold core 231 in (a) step (S110) , a cooling process, an ejection process, and a mold closing process may be performed based on the second mold core 232 .

And in the injection-molded product manufacturing method (S100) according to an embodiment of the present invention, while the injection process (pressing pressure process) and the mold opening process are performed based on the second mold core 232 in (d) step (S150), A cooling process, an ejection process, and a mold closing process may be performed based on the first mold core 231 .

That is, in the injection-molded product manufacturing method S100 according to an embodiment of the present invention, the injection process (holding pressure process), the mold opening process, the cooling process, the ejection process, and the mold closing process are performed twice during one cycle.

In addition, in the state in which the mold cavity 130 is spaced apart from the mold core 230 in (a) steps (S110) and (d) steps (S150) of the injection-molded product manufacturing method (S100) according to an embodiment of the present invention By directly injecting the cooled compressed air to the injection molded product 1P, it is possible to significantly reduce the processing time of the cooling process.

In the PRIOR of FIG. 13, the time required for each process of injection molding of the conventionally produced product (push button of a vacuum cleaner) produced by the present applicant is written.

As shown in FIG. 13 , it takes 3.5 seconds for the injection and holding process, 14.0 seconds for the cooling process, 3.0 seconds for the mold opening process, 2.5 seconds for the ejection process, and 3.0 seconds for the mold closing process. And one cycle of the entire injection process takes 26.0 seconds.

13 and 14 (A) and (B), the time required for each process of injection molding of a product (a push button of a vacuum cleaner) produced by the injection-molded product manufacturing method (S100) according to an embodiment of the present invention is written has been

As shown in FIG. 14 , it takes 3.5 seconds for the injection and holding process, 2.0 seconds for the mold opening process, 2.4 seconds for the moving step, 3.5 seconds for the cooling process, 2.0 seconds for the ejection process, and 2.0 seconds for the mold closing process. And one cycle of the entire injection process takes 19.8 seconds, and the half cycle takes 9.9 seconds.

That is, the injection-molded product manufacturing method S100 according to an embodiment of the present invention can reduce the injection process time by 60% or more compared to the conventional injection-molded product manufacturing method.

In the foregoing, specific embodiments of the present invention have been described and illustrated, but it is common knowledge in the art that the present invention is not limited to the described embodiments, and that various modifications and variations can be made without departing from the spirit and scope of the present invention. It is self-evident to those who have Accordingly, such modifications or variations should not be individually understood from the technical spirit or point of view of the present invention, and the modified embodiments should belong to the claims of the present invention.

S100: Injection molded product manufacturing method
S110: (a) step
S120: (b) step
S130: first moving step
S140: first penalization step
S150: (d) step
S160: (e) step
S170: second moving step
S180: 2nd stage of closing
1: Injection molding machine
10: injection mold
100: fixed side mold
110: fixed side mounting plate 130: mold cavity
111: sprue bush 140: air nozzle
120: fixed side template 141: first air nozzle
121: Euro 142: second air nozzle
200: movable side mold
210: base 240: ejector pin
211: movable side mounting plate 241: first ejector pin
A1: first actuator A3: third actuator
A2: second actuator 241P: first ejector plate
212: guide plate 242: second ejector pin
212R: rail A4: fourth actuator
212P: guide pin 242P: second ejector plate
220: housing 250: boundary member
221: upper plate 251: connection block
221S: slider 252: border plate
222: lower plate 253: contact member
223: side plate T1: air supply pipe
224: connection member T2: oil supply pipe
230: mold core T3: water supply pipe
231: first mold core 1P: injection molded product
232: second mold core
300: control unit
1000: injection molding equipment
2: Heating device 4: Oil supply device
3: cooling device 5: air supply device

Claims (12)

An injection molding machine comprising an injection mold, comprising:
The injection mold is
a fixed-side mold including a mold cavity; and
and a movable side mold reciprocating in a direction in which the injection mold is opened and closed to form a cavity;
The movable side mold,
a base that reciprocates in a direction in which the injection mold is opened and closed by a first actuator, and to which a second actuator is coupled;
a housing that reciprocates in a direction perpendicular to a direction in which the injection mold is opened and closed by the second actuator; and
A first mold core and a second mold core coupled to the housing and alternately engaged with the mold cavity by reciprocating movement of the housing by the second actuator,
When a molten material is injected into a cavity formed by any one of the first and second mold cores and the mold cavity, the injection molded article in the other one of the first and second mold cores is air cooled ( being air cooled,
injection molding machine. According to claim 1,
The fixed-side mold includes an air nozzle for forcibly injecting air toward the injection molded product in the other one of the first mold core and the second mold core,
injection molding machine. 3. The method of claim 2,
The air nozzle is
a first air nozzle provided on one side in a reciprocating direction of the housing by the second actuator based on the mold cavity; and
and a second air nozzle provided on the opposite side of the first air nozzle with respect to the mold cavity,
a control unit for controlling the air nozzle to forcibly inject air toward the injection-molded product in the other one of the first and second mold cores;
injection molding machine. According to claim 1,
The movable side mold,
a first ejector pin for pushing the injection-molded product in the first mold core;
a third actuator coupled to the housing and reciprocating the first ejector pin;
a second ejector pin for pushing the injection-molded product in the second mold core; and
A fourth actuator coupled to the housing and reciprocating the second ejector pin, comprising:
injection molding machine. According to claim 1,
A long rail is formed on the base in a reciprocating direction of the housing by the second actuator,
A slider that slides along the rail is formed in the housing,
injection molding machine. According to claim 1,
The movable side mold,
It is coupled to the base, comprising a boundary member forming both boundaries of the reciprocating movement section of the housing by the second actuator,
injection molding machine. A method for manufacturing an injection molded article using an injection molding machine including an injection mold, the method comprising:
The injection mold is
a fixed-side mold including a mold cavity; and
and a movable side mold moving in a direction in which the injection mold is opened and closed to form a cavity;
The movable side mold,
a base that reciprocates in a direction in which the injection mold is opened and closed by a first actuator, and to which a second actuator is coupled;
a housing that reciprocates in a direction perpendicular to a direction in which the injection mold is opened and closed by the second actuator; and
a first mold core and a second mold core coupled to the housing and alternately forming the mold cavity and the cavity;
(a) air-cooling the injection-molded article in the second mold core while injecting a molten material into the cavity formed by the first mold core and the mold cavity;
(b) moving, by the first actuator, the base in a direction in which the injection mold is opened and closed so that the cavity formed by the first mold core and the mold cavity is opened; and
(c) the second actuator moves the housing in a direction perpendicular to the direction in which the injection mold is opened and closed so that the second mold core and the mold cavity form a cavity, and then the first actuator injects the base Including the step of moving the mold in the opening and closing direction,
Injection molded product manufacturing method. 8. The method of claim 7,
(d) air-cooling the injection-molded article in the first mold core while injecting a molten material into the cavity formed by the second mold core and the mold cavity;
(e) moving the base in a direction in which the injection mold is opened and closed by the first actuator so that the cavity formed by the second mold core and the mold cavity is opened; and
(f) the second actuator moves the housing in a direction perpendicular to the direction in which the injection mold is opened and closed so that the first mold core and the mold cavity form a cavity, and then the first actuator injects the base Including the step of moving the mold in the opening and closing direction,
Injection molded product manufacturing method. 9. The method of claim 8,
The fixed-side mold includes an air nozzle forcibly injecting air injected from the outside,
In step (a), the air nozzle forcibly injects air into the injection molded product in the second mold core,
In the step (d), the air nozzle forcibly injects air into the injection molded product in the first mold core,
Injection molded product manufacturing method. 10. The method of claim 9,
The air nozzle is
a first air nozzle provided on one side in a reciprocating direction of the housing by the second actuator based on the mold cavity and for forcibly injecting air into the injection molded product in the first mold core; and
It is provided on the opposite side of the first air nozzle with respect to the mold cavity and includes a second air nozzle for forcibly injecting air into the injection-molded product in the second mold core,
Injection molded product manufacturing method. 9. The method of claim 8,
The movable side mold,
a first ejector pin for pushing the injection-molded product in the first mold core; and
A third actuator coupled to the housing and reciprocating the first ejector pin,
In step (e), the first ejector pin pushes the injection-molded product on the first mold core,
Injection molded product manufacturing method. 9. The method of claim 8,
a second ejector pin for pushing the injection-molded product in the second mold core; and
and a fourth actuator coupled to the housing and reciprocating the second ejector pin,
In step (b), the second ejector pin pushes the injection-molded product on the second mold core,
Injection molded product manufacturing method.

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