KR20180097200A - Manufacturing mold using a die slide injection for transparent product having a thick section and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a mold for manufacturing a transparent product with a thick part which is integrally formed by performing first and second injection processes in a sliding manner within one set of molds, and a method of manufacturing the transparent product with a thick part. The mold for manufacturing a transparent product with a thick part using die sliding injection (DSI) molding includes: a fixed lower mold in which first and second cylinders are installed to be in parallel and stand erect; a movable upper mold which is positioned on a top portion of the fixed lower mold, which has an injection nozzle for injecting a molten resin installed on a top central portion thereof, and which is closed or opened with respect to the fixed lower mold; and a third cylinder which is horizontally installed on one side of the fixed lower mold such that the third cylinder is perpendicular to the first and second cylinders. The bottom of the injection nozzle is communicated with a sprue, the first and second cylinders are spaced apart from each other at predetermined intervals, first and second operating cores formed in a rectangular body shape are each installed on the top of the first and second cylinders, and the first and second operating cores are each moved up and down by an up-and-down motion of a piston of the first and second cylinders.

Description

Technical Field [0001] The present invention relates to a mold for producing a transparent product having a thickened portion by using a D.S.I method, and a method of manufacturing the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a mold for manufacturing a transparent product having a thick portion using a DSI method and a method of manufacturing the same, and more particularly, And a method of manufacturing the same.

Generally, in the production of a transparent article having a thick section, a cavity having a product shape is formed in the mold when the fixed side and the movable side mold are closely contacted with each other, and a molten resin at a predetermined temperature is injected into the cavity When the filled molten resin solidifies after a certain period of time after being filled in the cavity, the mold is opened to take out the molded product. Particularly, this method is used in the production of a transparent product having a conventional thick-walled portion.

A transparent product having a thicker portion, in particular, an aspherical lens is a transparent product having a thickness of about 28 mm, and the accuracy of the roughness and shape of the product surface is important. A transparent product (for example, The shrinkage occurs in the product itself, leading to quality defects. In addition, since the product thickness is relatively thick and the solidification time is prolonged, the operation cycle time There is also a disadvantage of increasing.

In addition, when a transparent product having a thicker portion is manufactured by using the insert injection, the product is divided into two parts, first and second, to be bonded to each other, thereby preventing some shrinkage of the product itself However, there is a problem that two sets of molds are needed, and the cost aspect and the work cycle time can not be reduced.

FIG. 1 is a schematic view of a general injection method, in which a transparent product (for example, an aspherical lens or the like) having a thick portion is molded at one time and taken out. The mold is injected into the cavity of the mold at one time to mold the lens and take out after a predetermined solidification time. Such a molding method causes a difference in solidification time of the outside and inside of the product due to the thickness of the lens product, The shrinkage occurs in the product itself due to the difference in solidification time of the other parts, which leads to a quality defect, and the work cycle time is also lengthened.

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems as described above, and it is an object of the present invention to provide a method of manufacturing a transparent product having a thick portion constituted integrally by advancing primary and secondary injection in a set mold in a sliding manner And a method of manufacturing the same.

In order to solve the above-mentioned problems, a transparent product manufacturing mold having a thick portion using the DSI method according to the present invention is characterized in that a first and a second two cylinders 11 and 12 are arranged in parallel with each other, ); A movable upper mold 20 located at an upper portion of the fixed lower mold and provided with an injection nozzle 26 for injecting a molten resin at an upper central portion thereof and being moldable and openable with respect to the fixed lower mold; And a third cylinder (13) horizontally installed on one side of the stationary lower mold (20) and perpendicular to the first and second cylinders (11, 12); / RTI >

The lower end of the injection nozzle communicates with the sprue 23. The first and second cylinders 11 and 12 are spaced apart from each other by a predetermined distance, and the upper and lower ends of the first and second cylinders 11 and 12, respectively, The first and second actuating cores are vertically moved by the upward and downward movements of the pistons of the first and second cylinders, and the lower portion of the movable upper mold (20) is provided with first actuating cores (111, 121) A groove 21 is formed to form a cavity with the upper surface of the working cores when the core 111 and the second working core 121 are moved upward and a molded core 22 corresponding to a concave shape is formed on the groove And a cooling channel 25 of a wedge shape is machined at a position where the outer upper surface of the molding core and the groove of the movable upper mold are in contact with each other so that the coolant flows to the cooling channel 25, 10, a sliding slot 32 is formed on an upper portion of the third cylinder, The main core 30 of the rectangular body is connected horizontally by horizontally moving the piston of the third cylinder 13 so that the main core is horizontally moved through the sliding slot 32 And the main core is horizontally moved.

Also, a method of manufacturing a transparent product having a thick portion by using the DSI method is characterized in that the movable upper mold is closed with respect to the fixed lower mold, the piston of the first cylinder is raised, and the first actuating core step; Injecting a molten resin into a cavity formed between an upper surface of the raised first working core and a molding portion core provided in a movable upper mold groove through an injection nozzle 26 to manufacture a primary injection product; The raised first working core is lowered and the movable upper mold is opened to the fixed lower mold; Moving the primary article placed on the main core and the main core connected to the end of the piston by the horizontal movement of the piston of the third cylinder horizontally to the upper portion of the second working core after the movable upper mold is opened, Closing the movable upper mold with respect to the stationary lower mold, raising the piston of the second cylinder, and raising a second actuating core provided at the upper end of the piston; And injecting a molten resin through the injection nozzle into the cavity other than the upper surface of the raised second working core and the portion occupied by the primary injection product to produce a secondary injection product; Lowering the movable upper mold to the fixed lower mold and taking out the final product; And a control unit.

A transparent product manufacturing mold having a thick portion and a manufacturing method using the DSI method according to the present invention having the above-described features are characterized in that first and second injection are performed in a set mold in a sliding manner, Since the thickness of the product (product) is made thin, the solidification time of the outside and inside of the product is constant, and the shrinkage of the product due to the difference in solidification time can be prevented, The use of one set of molds and one injection nozzle can also simplify the mold apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a general injection method for manufacturing a transparent product having a thick section.
2 is a side cross-sectional view of a mold for manufacturing a transparent product having a thick portion according to the present invention.
3 is a cross-sectional perspective view of a mold for producing a transparent article having a thick portion according to the present invention.
FIG. 4 is a partial perspective view showing a state where a cooling part is provided and a cross-sectional view of a molding part core and a cooling channel of a movable upper mold according to the present invention.
5 is a side sectional view showing an operation method for manufacturing a transparent product having a thick portion according to the present invention.

In the present invention, first and second injection are performed in a sliding manner within a set of molds, and the first injection product and the second injection product are bonded to each other by themselves to produce a transparent product having one integral thick portion , A mold for producing a transparent product having a thick portion by using a DSI method, and a method of manufacturing the same.

2 to 5, a description will be given of a preferred embodiment of a mold for manufacturing a transparent product (for example, a transparent product including an aspherical lens or the like) having a thick portion by using the D.S.I process according to the present invention and a manufacturing method thereof.

A transparent product manufacturing mold having a thick portion using the D.S.I method is a mold comprising a fixed lower mold 10 in which two first and second cylinders 11 and 12 are installed upright in parallel to each other; A movable upper mold 20 located at an upper portion of the fixed lower mold and provided with an injection nozzle 26 for injecting a molten resin at an upper central portion thereof and being moldable and openable with respect to the fixed lower mold; And a third cylinder (13) horizontally disposed on one side of the fixed lower mold (20) so as to be orthogonal to the first and second cylinders (11, 12).

Preferably, the lower end of the injection nozzle 26 communicates with the sprue 23, and the first and second cylinders 11 and 12 are spaced apart from each other by a predetermined distance, The first and second working cores 111 and 121 are provided and the first and second working cores are moved up and down by the upward and downward movement of the pistons of the first and second cylinders 11 and 12. [ For example, the first cylinder 11 rises to the top during molding of the primary article, while the second cylinder 12 rises to the top during molding of the secondary article, and the first cylinder 11 descends Is placed in the initial position.

A recess 21 is formed in the lower portion of the movable upper mold 20 so as to form a cavity with the upper surfaces of the first and second actuating cores 111 and 121 when the first and second actuating cores 111 and 121 are moved upward, The cavity is formed between the upper surface of the working cores 111 and 121 and the forming portion core 22,

A flange forming groove 221 is formed in the bottom edge of the molding core 22. When the molten resin is filled in the cavity during the primary injection, the flange forming groove 221 is filled with the molten resin, A flange-forming groove 221 is formed for fixing the lower edge of the car exhibit to the main core 30. Due to the fixing shape as described above, the primary injection product can be fixed to the main core 30 without a separate fixing jig, and horizontally moved to the upper part of the secondary operation core 121 together with the main core for secondary injection.

A wobbled cooling channel 25 is machined into the outer upper surface of the forming core 22 and the movable upper mold at the point where the grooves of the movable upper mold 20 contact with each other, do. The cooling channel is formed by machining a groove into the lower inside of the movable upper mold 20 and fixing the molded part core 22 by fixing it. Preferably, the side surfaces of the first working core 111 and the second working core 121 are provided with a heat treatment sweeper or a component capable of guiding the working cores to facilitate the up and down operation of the working cores. The cooling channel 25 is formed in a three-dimensional shape so as to surround a curved surface along an upper curved surface of the molded core 22, thereby facilitating cooling of the article in the cavity. The refrigerant supply to the cooling channel is supplied by a refrigerant supply device (not shown) provided outside the mold device. This type of cooling reduces the total work cycle time to about 1000 sec. To about 350 sec.

The piston end of the third cylinder 13 is connected to the main core 30 of the rectangular body and the penetrating portion 31 is formed at the center of the main core 30. The main core 30 is horizontally moved by horizontally moving the piston. The main core 30 horizontally moves through a sliding slot 32 formed in the upper portion of the fixed lower mold 10. The sliding slots 32 are formed in the same rectangular shape as the main core 30 and the size in the horizontal direction of the main core is longer than the length of the main core, .

The first working core 111 of the upper end of the piston of the first cylinder 11 is formed to be convex on the upper surface and the second working core 121 of the upper end of the piston of the second cylinder 12 is concave on the upper surface , The shape of the top surface of the working cores is configured to match the shape of the article to be inspected. When the first and second actuating cores 111 and 121 do not move upward, that is, when the first and second actuating cores 111 and 121 do not move upward, the first and second actuating cores 111 and 121 are inserted into the sliding slot 32 First and second working core grooves 112 and 122 extending downward from the underside are further formed. The main core 30 can be horizontally moved without being in contact with the first and second working cores in a state where the first and second working cores 111 and 121 are inserted into the first and second working core grooves 112 and 122 . That is, the main core 30 can be horizontally moved without being interfered with the upper surfaces of the first and second working cores. The first and second working cores 111 and 121 are inserted into the first and second working core grooves 112 and 122 so that the upper surface of the first and second working cores 111 and 121 is positioned slightly below the lower surface of the sliding slot desirable.

The cylinders are mainly used for hydraulic cylinders, and alternatively, other driving means such as pneumatic cylinders may be used. In particular, moving the cores using hydraulic cylinders has the advantage of simpler structure and less cost than using other driving means.

A penetration portion 31 is formed at the center of the main core 30 of the oblong body so that the penetration portion 31 passes through the first and second actuating cores 111 and 121, (22) to form a cavity for the article to be inspected. That is, the main core 30 is positioned on the upper part of the first working core 111 at the time of primary injection so that the penetration part 31 of the main core passes through the first working core 111, 22) and forms a cavity for the primary injection product. During the secondary injection, the main core 30 is moved to the upper position of the second actuating core 121 by the horizontal movement of the piston of the third cylinder 13 And the penetrating portion of the main core 30 passes through the second actuating core 121 to approach the forming portion core 22 to form a cavity for the secondary output.

The runner 24 is provided on the left and right sides of the upper surface of the main core 30 so as to communicate with the sprue 23 through which the molten resin passes from the injection nozzle 26. Preferably, Are installed facing each other. The sprue is a vertical passage through which the molten resin passes, and the runner is a horizontal passage through which the molten resin passes. The molten resin from the injection nozzle through the sprue and the runner passes through the upper surfaces of the working cores (111, (22). ≪ / RTI > The filled molten resin is solidified by the refrigerant of the cooling channel 25 to form a product. More specifically, the runner 24 of the primary injection is installed and formed on the upper surface of the main core 30, and one runner 24 of the secondary injection is installed and formed slightly below the runner of the primary injection And the other runner is installed and formed slightly above the runner of the primary injection, that is, at the lower portion of the movable upper mold facing one runner, whereby the molten resin is supplied to the upper and lower portions of the primary transfer article, The secondary injection is carried out while wrapping the car exhibit, and finally a transparent product having a thick portion of one integral type article is completed.

A method of manufacturing a transparent product having a thick portion by performing first and second injection in a sliding manner using a mold for producing a transparent product having a thick portion using the D.S. I method described above,

Moving the movable upper mold 20 to the fixed lower mold 10 and raising the piston of the first cylinder 11 to raise the first actuating core 111 installed at the upper end of the piston;

A molten resin is injected into the cavity formed between the upper surface of the raised first working core 111 and the forming portion core 22 provided in the groove of the movable upper mold 20 through the injection nozzle 26, Making an entry;

The raised first working core 111 is lowered and the movable upper mold 20 is opened with respect to the fixed lower mold 10;

After the movable upper mold 20 is opened, the main core 30 connected to the end of the piston by the horizontal movement of the piston of the third cylinder 13 and the primary article placed on the main core are moved horizontally 2 Moving over the working core 121:

Lifting the piston of the second cylinder (12) and raising the second actuating core (121) installed on the upper end of the piston, with the movable upper mold (20) being closed with respect to the fixed lower mold (10);

The upper portion of the second actuating core 121 and the portion of the molded core 22 provided in the groove of the movable upper mold 20, other than the upper surface of the raised second working core 121 and the portion occupied by the primary article, Injecting a molten resin through a spray nozzle 26 into a cavity formed between the mold and the mold,

The elevated second operating core 121 is lowered, the movable upper mold 20 is opened to the fixed lower mold 10, and the final finished product is taken out; . In this stage, the solidification of the products is progressed to some degree by the refrigerant of the cooling channel 25, but not completely solidified in the stage of producing the primary product and the secondary product so that the first product and the second product By self-bonding, it is possible to produce a transparent product having a thick part composed of one integral body.

Also, the coolant to the cooling channel may be supplied at any time even when the molten resin is not injected into the cavity, and may be selectively supplied only when the molten resin is injected into the cavity. The upper and lower portions of the primary bore are specified on the upper surface of the second working core 121 and on the upper surface of the molded part core 20 provided in the groove of the movable upper mold 20. [ And upper and lower cavities formed between the upper and lower cavities 22, respectively.

The step of raising the piston of the first cylinder 11 and raising the first actuating core 111 mounted on the upper end of the piston is performed by moving the penetrating portion 31 of the central portion of the main core 30, (111) passes. The step of raising the piston of the second cylinder 12 and raising the second actuating core 121 provided at the upper end of the piston is performed by moving the penetrating portion 31 of the central portion of the main core 30 to the second actuating core 121).

A molten resin is injected through the injection nozzle 26 into the cavity formed between the upper surface of the raised first working core 111 and the forming portion core 22 provided in the groove 21 of the movable upper mold 20 The step of producing the primary injection product further comprises that the molten resin from the injection nozzle is injected into the cavity through the runner (24) formed on one side of the main core through the spool (23). The first injection product is placed on the main core 30 and the third cylinder 13 is operated to move the main core 30 horizontally and to be positioned above the second actuating core 122. [

 The injection nozzles 26 (not shown) are provided in the cavities formed between the molding core 22 provided in the recesses of the movable upper mold 20 other than the upper surface of the raised second working core 121 and the portion occupied by the primary product. ) Further comprises injecting molten resin from the injection nozzle into the cavity through a runner formed on the other side of the main core opposing the one side through the sprue in the step of injecting the molten resin through the injection nozzle do. The secondary injection proceeds to the upper and lower parts of the primary product and covers the primary product at the top and the bottom. After that, the solidification is progressed by the refrigerant of the cooling channel, and one product A transparent product with an aspheric lens, and the like) is formed. Through the steps described above, the first product and the second product are bonded together, thereby producing a transparent product having a thick part constituted by one integral body have.

The disadvantage of the rotary double injection molding method is that the manufacturing cost of the mold is increased and a dedicated injection molding machine for double injection molding is used. .

In addition, in the case of the conventional D.S.I method, two injection nozzles are required. One injection nozzle forms a product, and the other nozzle is used to join a molded product. However, since the color of the primary molding resin and the secondary molding resin of the article (product) of the present invention is the same, the mold structure capable of being injected by one injection nozzle and also being injected by a common injection machine, Without mass production.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

10. Fixed lower mold 11. First cylinder
12. Second cylinder 13. Third cylinder
111. First working core 121. Second working core
112. First working core groove 122. Second working core groove
20. movable upper mold 21. groove
22. Molded core 23. Spur
24. Runner 25. Cooling channel
30. Main core 31. Perforations
32. Main Core Sliding Slot
26. Injection nozzle

Claims (10)

In a mold for producing a transparent product having a thick portion using a DSI method,
A fixed lower mold 10 provided with two first and second cylinders 11 and 12 standing upright;
A movable upper mold 20 located at an upper portion of the fixed lower mold and provided with an injection nozzle 26 for injecting a molten resin at an upper central portion thereof and being moldable and openable with respect to the fixed lower mold; And
A third cylinder (13) horizontally installed on one side of the stationary lower mold (20) and perpendicular to the first and second cylinders (11, 12); / RTI >
The lower end of the injection nozzle communicates with the sprue 23. The first and second cylinders 11 and 12 are spaced apart from each other by a predetermined distance, and the upper and lower ends of the first and second cylinders 11 and 12, respectively, Wherein the first and second actuating cores are vertically moved by upward and downward movements of the pistons of the first and second cylinders, wherein the first and second actuating cores are provided with operating cores (111, 121) Production mold.
The method according to claim 1,
A recess 21 is formed in the lower portion of the movable upper mold 20 so as to form a cavity with the upper surfaces of the first and second actuating cores 111 and 121 when the first and second actuating cores 111 and 121 are moved upward, Shaped cooling channel 25 is further provided at a position where the outer upper surface of the molding core and the groove of the movable upper mold are in contact with each other, And a coolant flows through the mold.
3. The method of claim 2,
A sliding slot 32 is formed on an upper portion of the fixed lower mold and a piston end of the third cylinder 13 is connected to a main core 30 of a rectangular body, And the main core is horizontally moved through the sliding slot while being horizontally moved by the horizontal movement, wherein the main core is horizontally moved through the sliding slot.
The method of claim 3,
The first working core 111 of the upper end of the piston of the first cylinder 11 is formed to be convex on the upper surface and the upper end of the second working core 121 of the upper end of the piston of the second cylinder 12 is concave First and second working core grooves 112 and 122 are further formed on the lower surface of the sliding slot 32 so that the first and second working cores 111 and 121 are inserted, The upper surfaces of the first and second operating cores are respectively positioned below the lower surfaces of the sliding slots so that the main cores are horizontally moved without being interfered with the first and second working core grooves 112 and 122 respectively inserted into the first and second working core grooves 112 and 122, A transparent mold making mold with heavy metal parts using DSI method.
5. The method of claim 4,
A penetrating portion 31 is formed at the center of the main core 30 and the first and second actuating cores 111 and 121 pass through the penetrating portion 31, The first working core is positioned above the first working core 111 at the time of injection so that the first working core passes through the penetration portion 31 of the main core and the main core is in contact with the piston of the third cylinder 13 Wherein the second actuating core is positioned above the second actuating core (121) in a horizontal motion, and the second actuating core passes through the penetration of the main core (30).
6. The method of claim 5,
A runner 24 communicating with the spool 23 through which the molten resin from the injection nozzle 26 passes is provided on the left and right sides of the upper surface of the main core 30 so as to be melted through the spool and the runner, Wherein the resin is filled in the cavity, and the resin is filled in the cavity.
3. The method of claim 2,
And a flange forming groove (221) is formed in the lower edge of the molding core (22).
A method of manufacturing a transparent product having a thick portion by using a DSI method,
Closing the movable upper mold with respect to the stationary lower mold, raising the piston of the first cylinder, and raising the first actuating core provided at the upper end of the piston;
And injecting a molten resin into a cavity formed between an upper surface of the raised first working core and a molding core provided in a movable upper mold groove to form a primary discharged article;
The raised first working core is lowered and the movable upper mold is opened to the fixed lower mold;
Moving the primary article placed on the main core and the main core connected to the end of the piston by the horizontal movement of the piston of the third cylinder horizontally to the upper portion of the second working core after the movable upper mold is opened,
Closing the movable upper mold with respect to the stationary lower mold, raising the piston of the second cylinder, and raising a second actuating core provided at the upper end of the piston;
A molten resin is injected through a spray nozzle into a cavity formed between molding cores provided in the grooves of the movable upper mold other than the upper surface of the raised second working core and the portion occupied by the primary injection product, : ≪ / RTI >
The elevated second working core is lowered, the movable upper mold is opened to the fixed lower mold, and the final finished product is taken out; The method comprising the steps of: (a) preparing a transparent product by using a DSI method;
9. The method of claim 8,
The step of raising the piston of the first cylinder and raising the first actuating core provided at the upper end of the piston further comprises passing the penetrating portion of the center of the main body through the first actuating core and raising the piston of the second cylinder, Wherein the step of raising the second actuating core disposed at the upper end of the piston further comprises passing the penetrating portion of the main core at the second actuating core.
9. The method of claim 8,
The step of injecting the molten resin through the injection nozzle into the cavity formed between the upper surface of the raised first working core and the molding core provided in the groove of the movable upper mold to manufacture the primary injection product may include melting The resin is injected into the cavity through the runner formed on one side of the main core through the sprue and is injected into the cavity of the movable upper mold other than the upper surface of the raised second working core and the portion occupied by the primary injection product, The step of injecting the molten resin through the injection nozzle into the cavity formed between the cores to manufacture the secondary injection product comprises the step of injecting the molten resin from the injection nozzle through the runner formed on the other side of the main core The method of manufacturing a transparent product having a thick part by using a DSI method.

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