KR101189111B1 - Mold for injection molding - Google Patents

Abstract

PURPOSE: An injection mold is provided with a low manufacturing cost as members for the mold are mutually used regardless of injection molded articles. CONSTITUTION: An injection mold(100) comprises a lower plate(103), an upper plate(101), a lower core(107), an upper core(105), and an ejection unit. The upside of the lower plate and the downside of the upper plate are flat. The upper plate is placed on the lower plate. The upper and lower cores are fixed to the center of the upper surface of the lower plate and the center of the lower surface of the upper plate, respectively. Each side of the upper and lower cores is exposed to the outside. The upper core is closely attached to the lower core, and a cavity is formed. The molten resin in the cavity is cured, and injection molded articles are formed. The ejection unit separates the injection molded articles from the cavity.

Description

Injection molding mold {Mold for injection molding}

TECHNICAL FIELD The present invention relates to an injection molding die, and more particularly, to an injection molding die whose structure is simple and manufacturing cost is reduced.

Injection molding is a method of forming a product by injecting and cooling a molten resin into a mold and then cooling the product. The shape of the product is higher than that of other molding methods such as compression molding and extrusion molding. In addition, the size and the size are limited, and the productivity and work efficiency is excellent, it is widely used in the molding of plastic products.

1 is a cross-sectional view showing an example of a conventional injection molding mold. Referring to FIG. 1, in the conventional injection molding mold 10, grooves are formed on the lower lower plate 14, which is fixed to the upper clamping plate 13, and the upper lower plate 16 is formed and moves. The upper core 23 and the lower core 20 are inserted into and fixed to the groove. In addition, the role and operation mechanism for supporting the mill pin 28 and the plate 26, 27 which is returned when the extraction operation is performed by the plate 26, 27 to extract the cured injection molding from the (cavity) product 22 There is a spacer block 25 for setting the stroke therebetween, and the fixing plate 12 for fixing it forms a compact operation section by fixing the spacer block and the lower plate. In addition, the upper fixing plate 13 is provided on the upper disc 16 so as to withstand strong pressure when injecting the molten resin into the cavity 22.

However, this conventional injection molding mold 10 includes a number of members such as upper and lower fixing plates 13 and 12, a pair of sealing plates 26 and 27, a spacer block 25, and thus, the size and thickness thereof. It is also difficult to reduce. In addition, grooves for inserting and seating the upper core 23 and the lower core 20 should be formed in the upper disc 16 and the lower disc 14, respectively. Cooling flow paths for cooling must be formed in the upper disc 16, the lower disc 14, the upper core 23, and the lower core 20, so that precise and difficult machining operations are required. As a result, the manufacturing cost of the injection molding die also increases.

The present invention provides an injection molding mold which can reduce the number of required members, reduce difficult machining operations, can be easily manufactured, and can be manufactured at low cost.

In addition, the present invention provides an injection molding mold that can reduce the size and thickness, and can be efficiently processed according to the application to reduce the number of days to reduce the delivery time and reduce the cost.

The present invention, the lower side of the upper plate is flat, the lower plate is located on the lower plate, the lower side is flat plate, the lower core is fixed to the center of the upper side of the lower plate, fixedly coupled to the center of the lower side of the upper plate An upper core, at least one lower parting protective block fixedly coupled to an upper peripheral portion of the lower disc, and at least one upper parting protective block fixedly coupled to a lower peripheral portion of the upper disc, the lower disc When the and the upper plate are close to each other, the lower core and the upper core is in close contact with each other to form a cavity (molity) injecting molten resin, the at least one lower parting protection block and at least one upper parting protection block is in close contact with each other. The lower core and the upper core in close contact with each other outside the lower portion heated by the injection of the molten resin An injection molding mold is provided in which a cooling space filled with air is formed to cool the core and the upper core.

The at least one lower parting protective block is fixedly coupled to an upper side of the lower disc to surround the lower core, and the at least one upper parting protective block surrounds the upper core to lower the lower disc. It is fixedly coupled to the side, the cooling space may be formed between the lower core and the upper core in close contact with each other, and at least one lower parting protection block and at least one upper parting protection block in close contact with each other.

The lower disc and the upper disc may be in the form of plates each having a predetermined thickness.

The lower parting protection block is provided with a plurality of spaced apart from each other, the lower core cooling passages extending from one side to the other side is formed in the lower core, the refrigerant flow pipe connected to the lower core cooling passages It may be connected to the lower core cooling passages through a plurality of spaced apart lower parting protection block.

The upper parting protection block may be provided in plurality and spaced apart from each other, and an upper core cooling passage extending from one side to the other side of the upper core may be formed, and the refrigerant flow pipes connected to the upper core cooling passage may be connected to each other. It may be connected to the upper core cooling passages by passing between a plurality of spaced apart upper parting protection block.

The injection molding die of the present invention further includes a resin injection unit for injecting molten resin into the cavity at a high pressure, wherein the resin injection unit is fixedly coupled to a base and the base, and thus a passage of the molten resin. A sprue bush, a nozzle for discharging the molten resin having passed through the sprue bush to the cavity, and a nozzle support for supporting the nozzle and fixedly coupled to the base; The base may be fixedly coupled to the upper disc or the lower disc by bolts.

The injection molding die of the present invention further includes a take-out unit for separating out the injection-molded product formed by curing the molten resin injected into the cavity from the cavity, wherein the take-out unit is inserted and fixed to one of the lower disc and the upper disc. And a rod extending from the pneumatic cylinder to the cavity and whose end protrudes into the cavity by the driving force of the pneumatic cylinder to push the injection molding out of the cavity, A rod head may be provided to seal the cavity so that the molten resin injected into the cavity does not leak toward the take-out unit before curing.

The injection molding die of the present invention further includes a take-out unit for separating out the injection-molded product formed by curing the molten resin injected into the cavity from the cavity, wherein the take-out unit includes an outer surface of one of the lower disc and the upper disc. An air jet flow path that extends from the cavity to the cavity and guides the high pressure air jet to the cavity, and is inserted into the air jet flow path, the outer circumferential surface in close contact with the inner circumferential surface of the air jet flow path, and the outer circumferential surface A body having a groove concave toward the center and having a groove extending parallel to the direction of extension of the air jet flow path, the body being closer to the cavity and closer to the inner circumferential surface of the air jet flow path A head having a diameter which is not equal to that of the head, and the body and the head are connected to each other, An insertion member having a small neck may be provided, and a distance between an outer circumferential surface of the head and an inner circumferential surface of the air jet flow path may be 0.020 to 0.040 mm.

In addition, the depth of the groove may be 0.020 to 0.040mm.

The injection molding die of the present invention can reduce the number of necessary members and reduce difficult machining operations compared to the conventional, can be easily produced and can be produced at a low cost, and can easily reduce the size and thickness of the injection molding mold to be produced.

In addition, irrespective of the change of the injection molding, members of the upper disc, the lower disc, the upper parting protection block, and the lower parting protection block can be used in common, thereby further reducing the injection molding mold manufacturing cost.

1 is a cross-sectional view showing an example of a conventional injection molding mold.
2 is a cross-sectional view showing an injection molding mold according to an embodiment of the present invention.
3 is a cross-sectional view illustrating a state in which a molded product is taken out of the injection molding die of FIG. 2.
4 is a plan view illustrating the lower disc, the lower core, and the lower parting protection block of FIG. 2.
FIG. 5 is a cross-sectional view illustrating a resin injection unit coupled to the bushing molding die of FIG. 2. FIG.
6 is a view showing an injection molding die according to another embodiment of the present invention, a cross-sectional view showing in detail the take-out unit.
FIG. 7 is a perspective view illustrating the insertion member of FIG. 6. FIG.

Hereinafter, with reference to the accompanying drawings will be described in detail an injection molding mold according to an embodiment of the present invention. The terminology used herein is a term used to properly express the preferred embodiment of the present invention, which may vary depending on the intention of the user or operator or the custom of the field to which the present invention belongs. Therefore, the definitions of the terms should be made based on the contents throughout the specification.

2 is a cross-sectional view showing an injection molding mold according to an embodiment of the present invention, FIG. 3 is a cross-sectional view showing a state in which a molded product is taken out of the injection molding mold of FIG. 2, and FIG. 4 is a lower portion of FIG. 2. Top view, bottom core, and bottom parting protection block.

Referring to FIG. 2, the injection molding mold 100 according to an exemplary embodiment of the present invention includes a lower disc 103 having a flat upper side and an upper disc 101 positioned on a lower disc 103 and having a flat lower side. Equipped. Preferably, the lower disc 103 and the upper disc 101 may be in the form of a plate having both upper and lower sides flat and all parts having a constant thickness.

The injection molding die 100 includes a lower core 107 fixedly coupled to an upper side center portion of the lower disc 103, and an upper core fixedly coupled to a bottom side center portion of the upper disc 101. 105, a lower parting protection block 113 fixedly coupled to an upper peripheral portion of the lower disc 103, and an upper parting protection block 111 fixedly coupled to a lower peripheral portion of the upper disc 101 is further provided. . The lower core 107 and the lower parting protection block 113 are fixedly coupled to the lower disc 103 by fastening bolts (not shown), and the upper core 105 and the upper parting protection block 111 are also the upper disc 101. ) May be fixedly coupled to the fixing bolt (not shown).

The upper disc 101 can be moved away from or near the lower disc 103. When the lower disc 103 and the upper disc 101 are close to each other, the lower core 107 and the upper core 015 are in close contact with each other, and the lower parting protection block 113 and the upper parting protection block 111 are in close contact with each other. do. To this end, the sum of the thicknesses of the lower core 107 and the upper core 105 and the sum of the thicknesses of the lower parting protection block 113 and the upper parting protection block 111 are designed to be equal to each other, and more preferably, the lower core. The thickness of 107 and the lower parting protection block 113 is the same, and the thickness of the upper core 105 and the upper parting protection block 111 is designed to be the same.

The lower core 107 and the upper core 105 are in close contact with each other at the center of the injection molding die 100, and the lower parting protection block 113 and the upper parting protection block 111 are in close contact with each other in close contact with each other. It is not concentrated only on the lower core 107 and the upper core 105 but is distributed to the periphery. Thus, damage and breakage of the lower core 107 and the upper core 105 during the injection molding operation are prevented. In addition, when the injection molding 5 is to be changed, even if the lower core 107 and the upper core 105 are changed, the lower disc 103, the upper disc 101, the lower parting protection block 113, and the upper parting part. The protection block 111 may be used in common without changing, thereby reducing mold manufacturing cost and time.

In the lower core 107 and the upper core 105 in close contact with each other, a cavity 108 into which molten resin is injected is formed. The molten resin injected into the cavity 108 is cold cured to form an injection molding 5 (see FIG. 3). The cavity 108 may be formed by concave grooves on the upper surface of the lower core 107. However, the present invention is not limited thereto, and grooves may be provided in a concave groove on the lower side of the upper core 105, and grooves may be formed on both the upper side of the lower core 107 and the lower side of the upper core 105. You may.

The outside of the lower core 107 and the upper core 105 in close contact with each other is filled with air to cool the heated lower core 107 and the upper core 105 due to the molten resin injected into the cavity 108. Cooling space 120 is formed. In the illustrated embodiment, the lower parting protection block 113 is fixedly coupled to the upper side of the lower disc 103 so as to surround the lower core 107, and the upper parting protection block 111 is the upper core 105. It is fixedly coupled to the lower side of the upper disc 101 to surround the. Thus, the cooling space 120 of the injection molding die 100 is between the lower core 107 and the upper core 105 in close contact with each other, and the lower parting protection block 113 and the upper parting protection block 111 in close contact with each other. Is formed.

The injection molding mold 100 may further include a configuration for cooling the lower core 107 and the upper core 105 through heat exchange using a refrigerant. Specifically, the injection molding mold 100 has a lower core cooling passage 128 extending from one side to the other side in the lower core 107, and the other side from the one side in the upper core 105. It has an upper core cooling passage 124 extending to. Referring to FIG. 4, a plurality of lower parting protection blocks 113A to 113H are disposed adjacent to the lower core 107, and a pair of lower parting protection blocks 113A and 113B and 113B and 113C are spaced apart from each other. Refrigerant flow pipe 126 passes between 113E and 113F and 113F and 113G and is connected to the lower core cooling passage 128.

Meanwhile, although not illustrated in a separate drawing, as in the case of the lower core 107, a plurality of upper parting protection blocks are disposed adjacent to the upper core 105 (see FIG. 2) and spaced apart from each other. Refrigerant flow pipes 122 (see FIG. 2) pass between the upper parting protection blocks of to connect to the upper core cooling passage 124 (see FIG. 2). In the injection molding die 100, the upper disc 101 and the lower disc 103 do not need to form cooling passages, and the cooling passages 124 and 128 are formed only on the upper core 105 and the lower core 107. As a result, the processing for fabrication is easier than in the conventional injection molding mold.

Referring again to FIGS. 2 and 3, the injection molding die 100 further includes a take-out unit for separating out the injection molded product 5 formed by curing the molten resin injected into the cavity 108 from the cavity 108. . The take-out unit includes a pneumatic cylinder 115 inserted into and fixed to the lower disc 103, and a rod 116 extending from the pneumatic cylinder 115 to the cavity 108.

When the molten resin injected into the cavity 108 is cooled and cured to form the injection molded article 5, the upper disc 101 is raised to space the lower core 107 and the upper core 105 from each other. At this time, when the pneumatic cylinder 115 is operated, the end of the rod 116 protrudes into the cavity 108 by the driving force, and the injection molding 5 is pushed out of the cavity 108, so that the operator can easily insert the injection molding 5. ) Can be taken out from the cavity 108.

FIG. 5 is a cross-sectional view illustrating a resin injection unit coupled to the bushing molding die of FIG. 2. FIG. Referring to FIG. 5, the injection molding die 100 (see FIG. 2) further includes a resin injection unit 130 for injecting molten resin at a high pressure into the cavity 108 (see FIG. 2). The resin injection unit 130 includes a resin injection unit base 131, a sprue bush 133 fixedly coupled to the base 131, a nozzle 135, and the nozzle 135. Is provided with a nozzle support (138).

The sprue bush 133 is a passage of the molten resin and is fixedly coupled to the base 131 by the bolt 141. The nozzle 135 is fluidly connected to the sprue bush 133, and the molten resin passing through the sprue bush 133 is discharged to the cavity 108 (see FIG. 2) through the nozzle 135. The nozzle 135 is fixedly coupled to the nozzle support 138, and the nozzle support 138 is fixedly coupled to the base 131 by the bolt 142. The base 131 is fixedly coupled to the upper disc 101 by bolts 143. Due to this structure, the resin injection unit 130 can be separated from the upper disc 101 by loosening only the bolt 143 with a screw driver (not shown), thereby quickly and easily coping with a failure of the resin injection unit 130.

6 is a view showing an injection molding die according to another embodiment of the present invention, which is a cross-sectional view showing in detail the extraction unit, Figure 7 is a perspective view showing the insertion member of FIG. Referring to FIG. 6, the injection molding die 200 according to another embodiment of the present invention may have an upper disc 201, a lower disc 203, and an upper core similarly to the injection mold 100 shown in FIG. 2. 205, a lower core 207, an upper parting protection block 211, and a lower parting protection block 213. The injection molding die 200 is provided with two different kinds of blowout units 220 and 240, which are required to take out the injection molded product 7 formed by curing the molten resin from the cavity 208.

The first take-out unit 220 includes a pneumatic cylinder inserted into and fixed to the lower disc 203, a rod 225 extending from the pneumatic cylinder to the cavity 208, and a bolt at the end of the rod 225. A rod head 227 fixedly coupled by 228. The pneumatic cylinder has a cylinder housing 221 and a piston 223 which is positioned to be elevated in the cylinder housing 221 and coupled to the lower end of the rod 225. Air pressure is transferred into the cylinder housing 221 through the first pressure passage 231 and the second pressure passage 232 formed in the lower disc 203, causing the piston 223 and the rod 225 to rise and fall. do.

The rod 225 has an upper end projecting into the cavity 208 by the driving force of the pneumatic cylinder to push the injection molding 7 out of the cavity 208. The rod head 227 seals the cavity 208 such that the molten resin injected into the cavity 208 does not leak through the side of the take-out unit 220, specifically, the passage in which the rod 225 is lifted up and lowered before curing. An extraction member 229 may be formed on an upper surface of the head 227 to be formed in accordance with the shape of the end of the cavity 208.

The second extraction unit 240 includes an air jet passage 260 extending from the outer surface of the lower disc 203 to the cavity 208, and an insertion member 241 inserted into the air jet passage 260. The air jet passage 260 may direct a high pressure air jet to the cavity 208. Although not shown in FIG. 6 for this purpose, the air jet passage 260 may be connected to an air jet pump provided outside the lower disc 203.

6 and 7, the insertion member 241 includes a body 250, a head 242, and a neck 244. The body 250 has an outer circumferential surface 251 in close contact with the inner circumferential surface of the air jet flow path 260, and is recessed in the concave toward the central portion of the outer circumferential surface 251 and at least extended in parallel with the extending direction of the air jet flow path 260. It has one groove 253.

Head 242 is located closer to cavity 208 than body 250. The head 242 has a diameter that is not in close contact with the inner circumferential surface of the air jet flow path 260.

6 and 7, when it corresponds to the boss of the injection molding 7, a pin 248 may be formed in the head to correspond to the boss groove. The pin 248 may also function to prevent product shrinkage.

The distance G1 between the outer circumferential surface of the head 242 and the inner circumferential surface of the air jet flow path 260 is preferably 0.020 to 0.040 mm. This means that if the gap is less than 0.020 mm, sufficient air is not supplied to eject the injection molding, and if the gap is greater than 0.040 mm, the injection into the injection molding may leak out through the air jet flow path 260. Because there is.

In this case, it is preferable that the distance G1 between the air jet flow path 260 and the outer peripheral surface of the head 242 is 0.020 to 0.040 mm. Due to this minute gap G1, the molten resin does not flow from the cavity 208 into the air jet flow path 260 even before it is cured.

The neck 244 connects the body 250 and the head 242. The neck 244 is smaller in diameter than the head 242. In this case, the gap G1 between the neck 244 and the inner circumferential surface of the air jet flow path 260 is preferably 0.3 mm or more. This allows the neck to act as a tank for the air supplied through the air jet flow path to be sufficiently uniform, thereby pushing up the injection molding more uniformly.

On the other hand, the insertion member 241 is coupled to the lower disc 203 or the lower core 207, the coupling protrusion 249 may be formed to be firmly coupled.

Meanwhile, the depth G2 of the groove 253 may be 0.03 mm to 0.40 mm.

When the molten resin injected into the cavity 208 is cooled and cured to form an injection molded product 7 and the upper disc 201 is raised to separate the lower core 207 and the upper core 205 from each other. When the high pressure air jet is injected into the air jet flow path 260 through the groove 253 and the gap G1, the high pressure air jet is blown into the cavity 208 to inject the injection molding 7. Is pushed out of cavity 108. Therefore, the operator can easily take out the injection molding 7 from the cavity 208.

That is, according to the present invention, the upper disk is a single fixing plate without core pocket processing, to serve as a clamping role and a supporting plate for supporting the upper main core. In addition, the one fixing plate has a vertical guide pin hole, etc., so that the upper core can be fixed in place. The upper core parting surface outer wall forms a parting protection block for protecting the parting surface.

In addition, the lower disc is able to determine the exact position by in-row by fixing the lower core on the bottom without the movable side pocket processing, and the structure of forming a part protection block to protect the part in the core part surface outer wall Has

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

100: injection molding mold 101: upper disc
103: lower disc 105: upper core
107: lower core 108: cavity
111: upper parting protection block 113: lower parting protection block
115: pneumatic cylinder 116: rod
119: air jet flow path 120: cooling space

Claims (8)

delete delete A lower disc having a flat upper side;
An upper disc positioned above the lower disc and having a flat bottom surface;
A lower core fixedly coupled to an upper side central portion of the lower disc, the lower core being exposed to the outside;
The upper side is fixedly coupled to the lower side central portion of the upper disc, the side is exposed to the outside, when the lower disc and the upper disc is close to each other close to the lower core and close to each other to form a cavity (cavity) injecting molten resin core; And
And a take-out unit for separating out the injection-molded product formed by curing the molten resin injected into the cavity from the cavity.
The extraction unit,
An air jet flow path guiding a high pressure air jet to the cavity, which extends from the outer surface of one of the lower disc and the upper disc to the cavity; And,
An outer circumferential surface inserted into the air jet flow passage, the outer circumferential surface in close contact with the inner circumferential surface of the air jet flow passage, and a groove which is recessed in a concave direction from the outer circumferential surface toward the center thereof and extends in parallel with an extension direction of the air jet flow passage; A body having a diameter that is closer to the cavity than the body and is not in close contact with the inner circumferential surface of the air jet flow path, and a neck connecting the body to the head and having a smaller diameter than the head ( an insertion member having a neck),
The interval between the outer peripheral surface of the head and the inner peripheral surface of the air jet flow path is injection molding mold, characterized in that 0.020 to 0.040mm. The method of claim 3,
The lower disk and the upper disk, each injection molding mold, characterized in that the plate (plate) shape having a predetermined thickness. The method according to claim 3 or 4,
An upper parting protection block coupled to the upper disc so as to be spaced apart from the upper core at the same height as the upper core;
A lower parting protection block coupled to the lower disc so as to be spaced apart from the lower core at the same height as the outer core, and engaged with the upper parting protection block to disperse contact force between the upper core and the lower core; and,
The lower parting protection block is provided with a plurality and spaced apart from each other,
Inside the lower core is formed a lower core cooling passage extending from one side to the other side,
And a refrigerant flow pipe connected to the lower core cooling passage is connected to the lower core cooling passage by passing between the plurality of spaced lower parting protection blocks. The method according to claim 3 or 4,
An upper parting protection block coupled to the upper disc so as to be spaced apart from the upper core at the same height as the upper core;
A lower parting protection block coupled to the lower disc so as to be spaced apart from the lower core at the same height as the outer core, and engaged with the upper parting protection block to disperse contact force between the upper core and the lower core; and,
The upper parting protection block is provided with a plurality and spaced apart from each other,
An upper core cooling passage is formed inside the upper core and extends from one side to the other side thereof.
And a refrigerant flow pipe connected to the upper core cooling passage is connected to the upper core cooling passage through a plurality of spaced apart upper parting protection blocks. The method according to claim 3 or 4,
Further comprising a resin injection unit for injecting molten resin at a high pressure into the cavity, wherein the resin injection unit,
A base, which is fixedly coupled to the base, a sprue bush that serves as a passage for the molten resin, a nozzle for discharging the molten resin that has passed through the sprue bush to the cavity, A nozzle support supporting the nozzle and fixedly coupled to the base;
The base is an injection molding mold, characterized in that fixed to the upper disk or the lower disk by a bolt (bolt). The method according to claim 3 or 4,
The extraction unit is:
A pneumatic cylinder inserted into and fixed to one of the lower disc and the upper disc;
A rod extending from the pneumatic cylinder to the cavity and whose end protrudes into the cavity by a driving force of the pneumatic cylinder to push the injection molding out of the cavity;
A rod head coupled to an end of the rod to seal the cavity so that the molten resin injected into the cavity does not leak to the take-out unit before curing;
Injection molding mold, characterized in that it further comprises.

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