KR101169248B1 - A injection compression mould with transverse tapered sliding cores and an injection compression moulding method - Google Patents

Abstract

The present invention relates to an injection compression mold having a transverse inclination sliding core mounted therein for injection compression molding, and an injection compression molding method using the mold.
The injection compression molding mold according to the present invention includes a stationary side mold including a stationary side mounting plate and a upper plate, and a movable side mounting plate and a lower plate, in close contact with the stationary side mold to form a cavity having a product shape. An insert core including a side mold and inserted into the lower plate so as to be slidable up and down; A plurality of transverse inclined sliding cores installed under the insert core to slide in the transverse direction; And a plurality of transverse inclined sliding core driving devices for driving the transverse inclined sliding cores, wherein a transverse inclination is formed on a lower surface of the insert core and an upper surface of the transverse inclined sliding core in contact with the lower surface of the insert core. When the sliding core is moved outward from the center of the mold by the transverse inclined sliding core driving device, the insert core is moved upward. In addition, a method for injection compression molding a resin using an injection compression mold according to the present invention comprises the steps of: (1) providing an injection compression mold according to the present invention; (2) operating the drives of the transverse inclined sliding cores in the state of closing the fixed side mold and the movable side mold; (3) retracting the movable side mold by a predetermined distance from the fixed side mold while the movable side mold and the fixed side mold are in close contact; (4) injecting molten resin into the cavity in the injection compression mold; (5) compressing and molding the movable side mold by applying a clamping force to the stationary side mold to close the mold; (6) releasing the operation of the drive devices of the transverse inclined sliding cores, opening the mold by separating the movable side mold from the fixed side mold, and taking out the molded product.

Description

Injection compression mold with transverse sliding core and injection compression method {A INJECTION COMPRESSION MOULD WITH TRANSVERSE TAPERED SLIDING CORES AND AN INJECTION COMPRESSION MOULDING METHOD}

The present invention relates to an injection compression mold and an injection compression molding method, and more particularly, to an injection compression mold having a transverse inclination sliding core mounted therein for injection compression molding and an injection compression molding method using the mold. will be.

Generally in injection molding, molten resin is injected into the cavity of the mold closed through the gate by the injection pressure of the injection machine. Here, the cavity is a molding space between the upper plate or the upper core and the lower plate or the lower core in the mold, and refers to a space in which molten resin is filled to form a molded product.

If the shape of the molded product is complex, if the thickness of the product is thick, if there is a fine pattern in the mold, or if the density or viscosity of the molten resin is large, various injection compression molding methods are proposed to mold a homogeneous and high quality product. In the known injection compression molding method, there is a slight gap between the fixed side mold and the movable side mold before injection, or the fixed side mold and the movable side mold are injected by injection pressure while injecting. There has been suggested a method for allowing a certain gap to occur between the molten resin and evenly filling the mold in the cavity by applying pressure to the movable mold again to bring it into close contact with the stationary mold. Gate control device, or a separate servo motor, etc., between the fixed mold and the movable mold Control systems, including position sensors and pressure sensors, are needed to control the gaps and to control the forces for compressing the moving dies, and in particular the burrs around the molded part due to the gap between the fixed and moving dies. burr) occurs, resulting in waste of the resin material.

In addition, in the conventional injection compression molding, the function of compressing the resin is insufficient, and it is necessary to develop a mold capable of producing a high-quality molded product with sufficient compression effect.

SUMMARY OF THE INVENTION An object of the present invention is to provide an injection compression mold which can solve the above problems, prevent the occurrence of burrs around the molded article, and achieve high quality of the molded article.

Still another object of the present invention is to provide an injection compression mold capable of smoothly performing relative movement and preventing abrasion due to relative movement when each component in the mold moves relative to each other during injection compression molding. will be.

On the other hand, another object of the present invention is to provide a method for injection compression molding a resin using a mold equipped with an injection compression molding apparatus.

According to the present invention for solving the above problems, there is provided an injection compression mold, wherein the mold includes a fixed side mold including a fixed side mounting plate and a upper plate, a movable side mounting plate and a lower plate; An insert core including a movable side mold in close contact with the fixed side mold to form a cavity having a product shape, the insert core being inserted into the lower plate so as to be vertically slidable; A plurality of transverse inclined sliding cores installed under the insert core to slide in a transverse direction; And a plurality of transverse inclined sliding core driving devices for driving the transverse inclined sliding cores, wherein a transverse inclination is formed on an upper surface of the transverse inclined sliding core in contact with a lower surface of the insert core and a lower surface of the insert core. Thus, when the transverse inclined sliding core is moved outward from the center of the mold by the transverse inclined sliding core driving device, the insert core is moved upward.

Here, the transverse inclination formed on the lower surface of the insert core and the upper surface of the transverse slope sliding core is preferably 0.5 ° to 45 °.

In addition, the injection compression mold according to the invention, the vertical sliding core disposed between the transverse inclined sliding core; And a vertical sliding core driving device for driving the vertical sliding core, wherein a vertical inclination is formed on a surface where the lateral inclined sliding cores and the vertical sliding core contact each other, and the vertical sliding core is vertically sliding. Pulled downward by the core drive, it is desirable to prevent the transverse sliding cores from moving towards the center of the mold.

 Here, it is preferable that the inclination in the vertical direction formed on the surface where the lateral inclined sliding cores and the vertical sliding core contact is 0.5 ° to 45 °.

In addition, it is preferable that an abrasive plate is further provided on the side where the transverse slope sliding cores and the insert core contact each other.

Meanwhile, the upper plate may further include an upper core, and the lower plate may further include a lower core surrounding the insert core and a slide core surrounding the lower core, and the slide core and the upper core may contact each other. It is preferable that the inclination in the vertical direction is formed on the side. The inclination angle of the vertical direction is preferably 0.05 ° to 1 °. In addition, it is preferable that the inclination in the vertical direction is also formed on the side contact between the lower core and the insert core. The inclination angle of the vertical direction is preferably 0.05 ° to 1 °.

On the other hand, according to the present invention, there is provided a method for injection compression molding a resin using the above-mentioned injection compression mold, the method comprising the steps of: (1) providing an injection compression mold of the above-described content; (2) operating the drive devices of the transverse inclined sliding cores in a state of closing the fixed side mold and the movable side mold; (3) retracting the movable side mold by a predetermined distance from the fixed side mold while the movable side mold and the fixed side mold are in close contact; (4) injecting molten resin into the cavity in the injection compression mold; (5) compressing and molding the movable mold by applying close clamping force to the fixed mold; (6) releasing the operation of the drive devices of the transverse inclined sliding cores, opening the mold by separating the movable side mold from the fixed side mold, and taking out a molded product.

According to the injection compression mold according to the present invention and the injection compression molding method using the same, the following effects can be obtained.

-Reduce the shrinkage caused by the liquid molten resin solidifying in the mold, and the precision of the mold is reflected in the molded product as it is, it is possible to mold a molded product with high precision and small deformation, and also to shape the fine pattern in the mold It can be molded into a product.

-It prevents the occurrence of burrs around the molded product and prevents friction and wear due to the relative movement of parts in the mold.

In addition, the injection compression molding method using the injection compression mold according to the present invention exhibits a sufficient compression effect on the resin in the cavity to produce a high quality molded product.

1 is an assembled cross-sectional view of an injection compression mold according to a preferred embodiment of the present invention.
FIG. 2 is an enlarged view of part “A” surrounded by dashed lines in FIG. 1.
3 is a view schematically showing a process of injection compression molding using an injection compression mold according to the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described in detail with respect to the injection compression molding die equipped with a transverse inclination sliding core according to the present invention, which is illustrative and does not limit the present invention.

1 is a cross-sectional view of an injection compression mold equipped with a transverse inclined sliding core according to a preferred embodiment of the present invention. In this drawing, the injection compression molded product is illustrated as a case of a ring type product. This is exemplary and the invention can be applied to molding other types of products.

Referring to FIG. 1, the fixed side mold includes a fixed side mounting plate 11 and a upper plate 12, and includes an upper core 13, an upper heater core 14, a locating ring 15, and a sprue bush ( 16) may be further included, and these are all fixedly fastened to each other by fastening members, for example, fastening bolts, etc., thereby forming a fixed side mold.

On the other hand, the movable side mold includes a movable side mounting plate 21 and a lower plate 24, and includes a spacer block 22, a support plate 23, a slide core 25, a lower core 26, and a lower heater core ( 27) and the like, and these are also fastened to each other by fastening members, for example fastening bolts to form a movable side mold. A parting line in which the molds are separated from each other is formed at a portion where the movable mold and the fixed mold are in contact with each other.

When the movable die is in close contact with the stationary die (hereinafter referred to as "mold closed"), between the movable die and the stationary die, ie, between the upper core 13 and the lower core 26 and the slide core 25 in the drawing. The cavity 1 of the product shape is formed into a closed space (although it is indicated in this figure as a ring type product, other shapes are possible).

The molten resin injected from the injection machine (not shown) is, as shown by arrow "I" in the figure, the molten resin passages in the locating ring 15 and the mold, that is, the sprue 2, the runner 3, the gate 4 When the injected molten resin is cooled and solidified through the cavity 1, the movable side mold is spaced apart from the fixed side mold (called “opening”) to take out the solidified molded product. At this time, by moving the ejector upper plate 28a and the lower plate 28b disposed in the spacer block 22 upward, the ejector pins 29 fastened thereto move upward to extract the molded product.

Meanwhile, the insert core 110 is inserted into the lower core 26, and the insert core 110 is slidably mounted in the vertical direction on the inner surface of the lower core 26. In addition, a slide core 25 may be fixedly fastened to a movable mold in a circumference of the lower core 26. When the mold is mold-type, as shown in the drawing, the upper core 13, the lower core 26, and the slide may be fixed. The cavity 1 is formed between the core 25 and the insert core 110. In addition, during mold closing and mold opening, a sliding movement occurs in a side in which the slide core 25 is in contact with the upper core 13.

On the other hand, as shown in the figure below the insert core 110, the transverse sliding core device 120 is disposed symmetrically to the left and right sides with respect to the center line of the mold, respectively, to the side of the transverse sliding core device 120 The upper surface of the transverse slope sliding core 123 and the lower surface of the insert core 110 are slidably mounted to each other, and the transverse slope sliding driving the transverse slope sliding core 123 to one side of the transverse slope sliding core 123. The core drive unit 121, for example, the hydraulic cylinder, is connected by the connecting rods 122, respectively. In the present exemplary embodiment, two sets of transverse sliding core devices 120 are provided on both the left and right sides, respectively, but three or four sets may be installed symmetrically with respect to the center line of the mold.

Meanwhile, as illustrated in the drawing, a vertical sliding core device 130 may be disposed between the left and right lateral inclined sliding cores 123. The upper part of the vertical sliding core device 130 has a vertical sliding core 133 having an inverted truncated cone shape, which is vertically located under the vertical sliding core device 130 by the connecting rod 132. It is connected to the sliding core drive device 131, for example, a hydraulic cylinder, and can be vertically moved by the operation of the vertical sliding core drive device 131. In addition, the movable side mounting plate 21 may be provided with a drive cover 134 for disassembly and assembly of the vertical sliding core drive 131.

Here, the lower surface of the insert core 110 and the upper surface of the transverse inclined sliding core 123 is inclined downward from the center of the mold to the outside, so that the transverse inclined sliding core 123 operates the transverse inclined sliding core driving device 121. When pulled out by the insert core 110 is moved upward and in close contact with the upper core 13 of the fixed side mold with a strong force. In this case, in order to prevent the insert core 110 from being pushed downward by the injection pressure of the resin, the vertical sliding core 133 and the lateral inclined sliding core 123 are also in contact with each other, as shown in the figure, which is opened from the bottom up. The inclination of the shape is formed, the horizontal inclined sliding core 123 is spread to the left and right, the vertical sliding core 133 is vertical sliding core driving device 131 in the state that the insert core 110 is in close contact with the upper core 13 When pulled downward by the lateral sliding sliding core 123 is prevented from moving toward the center of the mold, thereby preventing the insert core 110 from moving downward.

FIG. 2 is an enlarged view of a portion “A” surrounded by a dashed line in FIG. 1. As described above, the upper surface of the transverse inclined sliding core 123 and the lower surface of the insert core 110 contacting the center are the center of the mold. It is inclined upward at an inclination angle "α", and the side of the transverse inclined sliding core 123 and the side of the vertical sliding core 133 in contact with the inclined are inclined at an inclination angle "β" that is formed from the bottom upward. Thus, even if the movable die retreats from the stationary die by "d" (as indicated by the dotted lines in the drawing), the transverse tilt sliding core 123 is moved outward by the transverse tilt sliding core drive 121. When the lower surface, i.e., moves in the direction of arrow X1 in the drawing, the insert core 110 is tightly adhered to the stationary mold, and in this state, the vertical sliding core 133 is pulled downward by the vertical sliding core driving device 131. When the surface is pulled in the direction of the arrow Y1 in the drawing, the transverse inclined sliding core 123 is prevented from moving toward the center of the mold (in the direction of the arrow X2 in the drawing), so that the insert core 110 adheres strongly to the fixed side mold. It can keep the state. Here, the inclination angle "α" may be about 0.5 ° to about 45 °, and the inclination angle "β" may also be about 0.5 ° to about 45 °.

On the other hand, on the contact surface of the insert core 110 and the transverse inclined sliding core 123 in which the sliding movement takes place, it is preferable to provide an abrasive plate 124 for smooth sliding movement and wear prevention. In addition, it is preferable to install the abrasive plate 111 for smooth sliding movement and abrasion prevention even on the contact surface where the insert core 110 is in contact with the movable mold, that is, the lower side of the lower core 26 in the drawing. . In addition, although not shown in the drawing, an abrasive plate may be provided on a contact surface in which the sloping sliding core 123 and the vertical sliding core 133 are in contact with each other to cause sliding movement.

Meanwhile, according to the present invention, there is provided a method of injection compression molding a product using the above-described injection compression mold, and FIG. 3 schematically illustrates the steps of injection compression molding a product using the injection compression mold according to the present invention. Is shown.

3 (a) is to operate the drive device 121 of the transverse inclined sliding cores 123 in a state in which the fixed side mold and the movable side mold is closed, the transverse inclined sliding core 123 is pulled out of the mold insert The core 110 shows a state in which it is in close contact with the mold on the fixed side. In addition, the vertical sliding core 133 is moved downward by the operation of the vertical sliding core driving device 131, it is possible to prevent the transverse slope sliding core 123 is moved toward the center of the mold.

3 (b) shows a state in which the molten resin is injected while the movable mold is retracted by the distance “d” from the fixed mold and the thickness of the cavity 1 in the mold is increased by “d”, in which the transverse slope Sliding core drive unit 121 continues to maintain the operating state, the insert core 110 is kept in close contact with the stationary mold. The distance "d" at which the movable die is retracted from the stationary die is here depending on the shape, size, material, etc. of the molded article, but is generally in the range of about 1 mm to about 10 mm and is less than the thickness of the molded article. It is preferable.

3 (c) shows a state in which the molten resin is injected into the cavity 1, the movable side mold and the fixed side mold are tightly closed by the clamping force, and the molten resin in the cavity 1 is compression molded. It is preferable to keep the inclined sliding core drive 121 in an operating state to prevent the molten resin in the cavity 1 from flowing back to the runner (3 in FIG. 1).

3D illustrates that after the injection compression molding is completed, the operation of the lateral inclined sliding core drive unit 121 and the vertical sliding core drive unit 131 is released, and the movable side mold and the fixed side mold are opened to eject the ejector. The state of taking out the molded product by using the pins 29 is shown (the resin of the runner part and the sprue part are shown to be taken out together with the molded product on the drawing, and they will be removed after taking out).

It should be noted here, referring again to FIG. 2, that the slide core 25 is in contact with the upper core 13, as shown in the drawing, the gradient of the inclination angle "θ1" is given, and the lower core 26 It is preferable to give a gradient of the inclination angle "θ2" also to the side in contact with the insert core 110, so that the slide core 25 and the lower core 26 and the side of the upper core 13 and the insert core 110 When the sliding movement, it is not the sliding method of sliding always in contact but the contact of the wet method of falling off, which is advantageous in terms of smooth sliding movement and wear prevention.

Here, the inclination angles &thetas; 1 " and "[theta] 2 " are fine values, for example, the values of " [theta] 1 " and " [theta] 2 " , The values of the gaps “g1” and “g2” between which the slide core 25 and the lower core 26 are spaced apart from the sides of the upper core 13 and the insert core 110 are about 0.026 mm. For example, when the values of "θ1" and "θ2" are set to 1 ° and the movable mold is retracted from the fixed mold by 3 mm, for example, before the molten resin injection, the values of the gaps "g1" and "g2" are about 0.052 mm. . It is preferable to calculate and incline these inclination angles so that molten resin may not flow in when molten resin injects in the state which the movable side metal mold | die retreated from the fixed side metal mold | die. For reference, the formula is as follows. g1 (or g2) = d x sin θ1 (or θ2). Of course, the inclination angles &thetas; 1 " and " [theta] 2 "

Summarizing the injection compression molding method described above, the injection compression molding method according to the present invention comprises the steps of: (1) providing the injection compression molding die; (2) operating the drive devices 121 of the transverse inclined sliding cores 123 in a state in which the fixed side mold and the movable side mold are closed (the insert core is thus closely adhered to the fixed side mold); (3) Retracting the movable side mold by a predetermined distance "d" from the fixed side mold in a state in which the movable side mold and the fixed side mold are in close contact (the driving devices 121 of the transverse inclined sliding cores 123 are Remain operational); (4) injecting molten resin into the cavity in the mold; (5) compressing and molding the movable die by applying a clamping force to the stationary die to close the mold (the driving apparatus 121 of the transverse inclined sliding cores 123 continues to operate); And (6) releasing the operation of the driving devices 121 of the transverse inclined sliding cores 123, and separating the movable side mold from the fixed side mold to open the mold to take out the molded product.

In the above description and drawings, the transverse inclination sliding core drive 121 and the vertical sliding core drive 131 are shown and described as hydraulic cylinders, but they may also be other drive devices such as pneumatic cylinders or electrical devices, for example. have.

The above description has been described by way of example of the present invention, the present invention is not limited to this, and those skilled in the art to which the present invention pertains without departing from the technical spirit of the present invention claimed in the claims. Obvious modifications are possible and such modifications are within the scope of the present invention.

1: cavity of product shape 2: sprue
3: runner 4: gate
11: fixed side mounting plate 12: upper plate
13: Sang core 14: Sang heater core
15: locating ring 16: sprue bush
21: movable side mounting plate 22: spacer block
23: base plate 24: the lower house
25: slide core 26: hardcore
27: Heater core 28a: ejector top
28b: ejector bottom plate 29: ejector pin
110: insert core 111: abrasive plate
120: lateral sliding core device 121: lateral sliding sliding core drive device
122: connecting rod 123: transverse inclined sliding core
124: abrasive plate 130: vertical sliding core device
131: vertical sliding core drive unit 132: connecting rod
133: vertical sliding core 134: drive cover

Claims (11)

An injection compression mold comprising a fixed side mold including a fixed side mounting plate and a upper plate, and a movable side mold including a movable side mounting plate and a lower plate and in close contact with the fixed side mold to form a cavity of a product shape. To
An insert core inserted into the lower plate to be slidable up and down;
A plurality of transverse inclined sliding cores installed under the insert core to slide in a transverse direction; And
And a plurality of transverse inclined sliding core driving devices for driving the transverse inclined sliding cores.
A transverse inclination is formed on a lower surface of the insert core and an upper surface of the transverse inclined sliding core in contact with the lower surface of the insert core so that the transverse inclined sliding core is moved outward from the center of the mold by the transverse inclined sliding core driving device. When moved, the insert core is characterized in that the injection molding die moving upward. The method of claim 1,
Injection molding molding, characterized in that the transverse inclination formed on the lower surface of the insert core and the upper surface of the transverse inclined sliding core is 0.5 ° to 45 °. The method of claim 1,
A vertical sliding core disposed between the transverse slope sliding cores; And
Further comprising: a vertical sliding core driving device for driving the vertical sliding core,
A vertical inclination is formed on a surface where the lateral inclined sliding cores are in contact with the vertical sliding core, and when the vertical sliding core is pulled downward by the vertical sliding core driving device, the lateral inclined sliding cores are centered in the mold. Injection compression molding, characterized in that the movement to the side is prevented. The method of claim 3,
Injection molding molding, characterized in that the inclination in the vertical direction formed on the surface in contact with the transverse inclined sliding cores and the vertical sliding core is 0.5 ° to 45 °. The method of claim 1,
Injection compression molding die, characterized in that the surface is further provided with a polishing plate in contact with the transverse inclined sliding core and the insert core. The method of claim 1,
An upper core is further included in the upper plate, and the lower plate further includes a lower core surrounding the insert core and a slide core surrounding the lower core. The method of claim 6,
Injection molding molding, characterized in that the inclination in the vertical direction is formed on the side of the slide core and the upper core in contact. The method of claim 7, wherein
The inclination angle of the vertical direction is injection compression molding mold, characterized in that 0.05 ° to 1 °. The method of claim 6,
Injection molding molding, characterized in that the inclined in the vertical direction is formed on the side contact the lower core and the insert core. 10. The method of claim 9,
The inclination angle of the vertical direction is injection compression molding mold, characterized in that 0.05 ° to 1 °. As a method of injection compression molding a resin, the method
(1) providing an injection compression mold according to any one of claims 1 to 10;
(2) operating the drive devices of the transverse inclined sliding cores in a state of closing the fixed side mold and the movable side mold;
(3) retracting the movable side mold by a predetermined distance from the fixed side mold while the movable side mold and the fixed side mold are in close contact;
(4) injecting molten resin into the cavity in the injection compression mold;
(5) compressing and molding the movable mold by applying close clamping force to the fixed mold;
(6) releasing the operation of the drive devices of the transverse inclined sliding cores, opening the mold by separating the movable side mold from the fixed side mold, and taking out a molded product.

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