KR101823084B1 - Apparatus and Method for Injection Molding Compensating for Deformation - Google Patents

Abstract

The present invention relates to a deformation correcting mold having a cavity having a negative shape complementary to a shape of a molding and further having an opposite shape capable of canceling deformation of the molding, ≪ / RTI >

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an injection molding apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a deformation correcting mold, a deformation correcting injection molding apparatus and a deformation correcting injection molding apparatus, and more particularly, to a deformation correcting injection molding apparatus and a deformation correcting injection molding apparatus which have a negative shape complementary to a shape of a molding, The present invention also relates to a deformation correcting injection molding apparatus and method using the deformation correcting mold.

Injection molding products are widely used for automobile interior materials, household electric appliances, and parts of mobile devices. Fig. 1 (a) shows an embodiment of a door scuff manufactured by injection molding. The door scuff is an automobile interior material mounted under a door gap of a door that rides down a car. As shown in Fig. 1 (b) And other components to act as an interior that enhances the visual impact of the car.

As can be seen from FIG. 2, when the door scuff is manufactured through the conventional injection molding, both end portions 2, which are relatively thin in thickness during the cooling process, are bent and deformed so that the central portion 1, Is a problem. Such deformation is caused by a difference in the cooling rate of each part of the molded product when the cooling progresses. FIG. 3 is a photograph of the actual mass produced door scuff with a size of 440 × 47 × 4.7 mm. It can be seen that the deflection of the center portion was formed by about 12 mm when both ends were bent. When the door scuffs in which such deformation occurs are put into the manufacturing process of the automobile, problems such as assembly failure occur.

Such deformation such as warping and twisting which occur in the molding process deteriorates the quality of the injection molding product and obstructs the utilization of the high productivity of the plastic injection molding in optical parts and precision functional parts do. Therefore, solving the problem of deformation is a very important task to improve the quality of injection molding products. On the other hand, improvement of appearance defects such as weld line, flow mark, and surface unevenness of the surface, which are generated in the injection molding process, is also a problem required for improving the quality of injection molding products.

In order to solve these problems, various prior arts have been introduced. However, improvement of the resin and injection conditions in the mold of the conventional injection mold has been limited, and production of the product has been performed by finding a proper compromise between productivity and quality.

Registration No. 0644920 "Molding device for injection molding machine ", Nov. 10, 2006 Registration No. 1157511 "Mold for molding and molding system having the same ", 2012. 06. 21.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art,

It is an object of the present invention to provide a deformation correcting mold having a cavity in which a negative shape complementary to the shape of a molding is additionally reflected in an opposite shape capable of canceling deformation of the molding, A molding apparatus and method are provided.

Another object of the present invention is to provide a deformation correcting mold which minimizes a quality problem due to deformation of a molded product, and an apparatus and method for deformation correction injection molding using the same.

It is another object of the present invention to provide a deformation correcting mold for improving the appearance quality of a weld line and the like, and a deformation correcting injection molding apparatus and method using the same.

It is still another object of the present invention to provide a deformation correcting mold suitable for injection molding of a long member such as a door scuff for a vehicle, and a deformation correcting injection molding apparatus and method using the deformation correcting mold.

The objects of the present invention are not limited to the above-mentioned objects, and other objects of the present invention which are not mentioned can be understood by the following description and can be more clearly understood by the embodiments of the present invention. Further, the objects of the present invention can be realized by means of the means shown in the claims and their combinations.

In order to achieve the above object, the present invention is implemented by the following embodiments.

According to an embodiment of the present invention, there is provided a mold for molding a molded article, wherein the mold has a cavity having a negative shape complementary to the shape of the molded article, Is characterized by having an opposite shape capable of canceling the deformation of the molding.

According to another embodiment of the present invention, the deformation correcting mold of the present invention is characterized in that the cavity includes a first cavity forming a thick portion of the molding and a second cavity forming a portion other than the thick portion of the molding, And the second cavity is formed continuously with the first cavity and is bent in a direction to project the first cavity convex upward.

According to another embodiment of the present invention, the deformation correcting mold of the present invention is characterized in that the second cavity is symmetrically formed on both sides with respect to the first cavity.

According to another embodiment of the present invention, in the deformation correcting mold of the present invention, the first cavity and the second cavity have the same curvature and are curved.

According to another embodiment of the present invention, the deformation correcting mold of the present invention is applied to an injection molding machine and includes an upper mold including an upper fixing plate and an upper core accommodated in the upper fixing plate; And a lower mold including a lower moving plate and a lower core accommodated in the normally lower moving plate, wherein the cavity is formed by the upper core and the lower core when the upper mold and the lower mold are closed .

According to another embodiment of the present invention, in the deformation correcting mold of the present invention, the upper mold includes heating means disposed at a portion of the upper fixing plate adjacent to the upper core to heat the upper core; Cooling means disposed at a portion of the upper fixing plate adjacent to the upper core to cool the upper core; Wherein the lower mold further comprises: heating means disposed at a portion of the lower moving plate adjacent to the lower core to heat the lower core; Cooling means disposed in a portion of the lower moving plate adjacent to the lower core to cool the lower core; And further comprising:

According to another embodiment of the present invention, in the deformation correcting mold of the present invention, the heating means is a heating tube to which a heating medium is supplied, and the cooling means is a cooling tube to which a cooling medium is supplied.

According to an embodiment of the present invention, the deformation correcting injection molding apparatus of the present invention comprises: the deformation correcting mold; And heating the upper and lower cores so that the upper core and the lower core are respectively heated to a set temperature. When the upper core and the lower core are heated to respective set temperatures, and the molding material is injected into the cavity, A control unit that activates the cooling means so that the lower core is cooled to a set temperature, respectively; And a control unit.

According to another embodiment of the present invention, in the deformation correction injection molding apparatus of the present invention, the control unit controls the cooling temperature of the lower core to be kept 60 to 100 ° C higher than the cooling temperature of the upper core at the time of cooling .

According to the embodiment of the present invention, the deformation correcting injection molding method of the present invention is a deformation correcting injection molding method using the deformation correcting mold, comprising a heating step of heating the upper core and the lower core to a set temperature, Wow; An injection step of moving the lower mold and filling the cavity with a molding material so that a mold is closed when the upper core and the lower core are respectively heated to a set temperature; A cooling step of cooling the upper core and the lower core to a set temperature respectively in a filling state of the molding material; A take-out step of moving the lower mold to form a mold and taking out the molded article from the cavity; And a control unit.

According to another embodiment of the present invention, in the deformation correction injection molding method of the present invention, the cooling step is performed in a state where the cooling temperature of the lower core is maintained to be 60 to 100 ° C higher than the cooling temperature of the upper core .

The present invention has the following effects.

The present invention relates to a deformation correcting mold having a cavity having a negative shape complementary to a shape of a molding and further having an opposite shape capable of canceling deformation of the molding, The present invention has the effect of providing a method.

The present invention provides an effect of implementing a deformation correcting mold and a deformation correcting injection molding apparatus and method using the deformation correcting mold that minimizes a quality problem due to deformation of a molded product.

The present invention has the effect of providing a deformation correcting mold which improves the appearance quality of a weld line of a molded product, and an apparatus and method of deformation correction injection molding using the same.

According to the present invention, it is possible to provide a deformation correcting mold suitable for injection molding of a long member such as a door scuff for a vehicle, and an apparatus and method for deformation correction injection molding using the same.

1 is a perspective view of an embodiment of a door scuff and an example of use.
2 is a schematic view showing a problem of deformation of a door scuff in injection molding;
Fig. 3 is a photograph of a door scuff which has been deformed by injection molding. Fig.
4 is a perspective view of a deformation correcting mold according to an embodiment of the present invention;
Fig. 5 is a sectional view of Fig. 4; Fig.
6 is a sectional view of a deformation correcting mold according to another embodiment of the present invention.
7 is a flowchart of a deformation correction injection molding method according to the present invention;
Fig. 8 shows the result of deformation measurement according to the test example of the opposite shape included in the cavity. Fig.
Fig. 9 is an example of additional test test for verification of the test example of Fig. 8;
Fig. 10 is a result of deformation measurement according to the test example of Fig.
11 is a photograph of a door scuff formed by injection molding at a holding pressure of 120 bar, a holding time of 9 seconds, a cooling temperature of 65 ° C on the upper side, and a cooling temperature of 35 ° C on the lower side.
12 is a photograph of a door scuff formed by injection molding at a holding pressure of 120 bar, a holding time of 9 seconds, a cooling temperature of 30 ° C on the upper side, and a cooling temperature of 130 ° C on the lower side.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a deformation correcting mold, a deformation correcting injection molding apparatus and a method according to the present invention will be described in detail with reference to the accompanying drawings. Unless defined otherwise, all terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs and, if conflict with the meaning of the terms used herein, It follows the definition used in the specification. Further, the detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

FIG. 4 is a perspective view of a deformation correcting mold according to an embodiment of the present invention, and FIG. 5 is a sectional view of FIG. 6 is a sectional view of a deformation correcting mold according to another embodiment of the present invention. The deformable correction dies shown in Figs. 4 to 6 are for forming the door scuffs as shown in the background of the invention. Referring to these drawings, the deformation correcting dies according to the present invention will be described in detail.

4 to 6, a deformation correcting mold according to an embodiment of the present invention is applied to an injection molding machine and includes an upper mold 100 and a lower mold 200, and the upper mold 100, The upper core 120 and the lower core 220 are formed in a cavity having a predetermined space when the lower mold 200 is closed.

The upper mold 100 generally has a rectangular parallelepiped shape and is formed of a metal having a very high strength and sufficient resistance to high temperature and is in contact with the lower mold 200 to form the cavity 10 . The upper mold 100 is a stationary mold fixed to the injection molding machine, and the lower mold 200 is moved up and down to make a closed state and a closed state. The upper mold 100 includes an upper fixing plate 110 and an upper core 120 accommodated in the upper fixing plate 110, an upper fixing table 130 and an injection unit 140 into which a molding material is injected.

The upper fixing plate 110 forms an outer surface of the upper mold 100 and a lower surface of the lower fixing plate 110 can receive the upper core 120. In order to heat the upper core 120, And a cooling means (40) disposed around the depression for cooling the upper core (120). It is preferable that the heating means 30 and the cooling means 40 are disposed close to the surface of the depression for efficient heating and cooling of the upper core 120. The heating means 30 may be a heater, And a heating tube to which a heating medium is supplied, and the cooling means 40 may be a cooling tube to which a cooling medium such as cooling water is supplied.

The upper core 120 is a metal mold received in a depression formed on a central bottom surface of the upper fixing plate 110, and includes an engraved portion for molding a molding. When the upper core 120 is formed as a negative portion, the lower core 220 has an embossed portion. The yin and yang of the upper core 120 and the lower core 220 may be reversed.

The upper fixing table 130 is a portion for fixing the upper mold 100 to the injection molding machine. The upper fixing table 130 should have fastening means for fastening with the injection molding machine.

The injector 140 is a portion to which molten resin as a molding material is injected from the injection molding machine and is a sprue which is an inlet through which the molten resin is injected, a runner which is a passage through which the molten resin flowing into the normal sprue flows, And a gate which is a narrow passage through which the molten resin flows into the mold 10.

The lower mold 200 has a generally rectangular parallelepiped shape and is formed of a metal which is very strong and can withstand high temperatures and is in contact with the upper mold 100 to form the cavity 10 . The lower mold 200 moves up and down to form a state of being opened and closed with the upper mold 100. [ The lower mold 100 includes a lower moving plate 210 and a lower core 220 accommodated in the lower moving plate 210. The lower fixing plate 230 and the take-out unit 240 are provided.

The lower moving plate 210 includes a depression for accommodating the lower core 120 on the upper surface thereof. The heating means 30 and the heating means 30 are disposed around the depression for heating the lower core 220. And cooling means (40) disposed around the depression for cooling the lower core (220). The heating means 30 and the cooling means 40 are preferably disposed close to the surface of the depressed portion for efficient heating and cooling of the lower core 220. The heating means 30 may be disposed near the surface of the depressed portion, And a heating tube to which a heating medium is supplied, and the cooling means 40 may be a cooling tube to which a cooling medium such as cooling water is supplied.

The lower core 120 includes a depressed portion for molding a molded product, the depressed portion being received in a depression formed in a central bottom surface of the lower moving plate 210. When the lower core 220 is formed as an embossed portion, the upper core 120 has a recessed portion. As described above, the yin and yang of the lower core 220 and the upper core 120 may be reversed.

The lower fixing table 230 is a part for fixing the lower mold 200 to a moving module that moves the lower mold 200 to open or close the upper mold 100. The lower fixing table 230 should have fastening means for fastening with the moving module.

The take-out unit 240 has the same structure as that applied to a conventional injection molding die, for taking out a molded product from the cavity 10 when the molding is completed and the molding is completed. An ejection plate 243 for ejecting the molded article and an ejection plate 243 for moving the ejection pin 241 are disposed between the upper fixing table 230 and the lower moving plate 210, And a spacer block 245 for securing a space for the action of the spacer.

The present invention is characterized by the shape of the cavity 10, which is a molding space in which a molding material formed in the upper mold 100 and the lower mold 200 are engaged to form a molded product, Wherein the cavity (10) has an opposite shape capable of canceling deformation of the molding.

The opposite shape of the cavity 10 reflects the deformation caused by the difference in the cooling temperature of each part of the molding as the cooling progresses and is a pre-correction shape for the deformation in the molding process. In other words, the opposite shape may be formed in advance in the cavity 10 in anticipation of deformation such as warpage during molding, and to reverse the direction and degree of the deformation expected to have the original intended shape as a result of such deformation Reflected shape. The opposite shape may vary depending on the molding, the molding material, etc., and can be derived through testing.

5, when the molded article is the door scuff, as shown in FIG. 5A, the upper mold 100 and the lower mold 200 are separated from each other and opened The upper mold 120 and the lower mold 220 may have the same shape as shown in FIG. 5C when the lower mold 200 moves in the mold closing state shown in FIG. 5 (b) The cavity 10 is formed.

The door scuff is an automobile interior material which is mounted on the bottom of a door of an automobile door and is a plate-shaped long member. As described in the background of the invention, when a door scuff is manufactured through injection molding, both ends of a relatively thin thickness are bent, The deformation that causes the relatively thick central portion to fall down occurs.

The present invention solves the problem of deformation by adding an opposite shape capable of offsetting the deformation to the cavity 10 on the premise that it is difficult to prevent the deformation itself from occurring during molding. The cavity (10) includes a first cavity (11) forming a thick part of the molding and a second cavity (12) forming a part other than the thick part of the molding, and the second cavity (12) 1 cavity and is bent in a direction to project the first cavity 11 upward convexly.

The second cavity 12 is symmetrically formed on both sides with respect to the first cavity 11. The first cavity 11 and the second cavity 12 are bent at the same curvature, And convex curved surfaces. In FIG. 5 (c), the height at which the center portion is derived from the horizontal plane is indicated by R, and the size and shape of the door scuff as a molding are determined in advance. Therefore, if R is determined, the curvature of the cavity 10 is also determined .

The door scuff formed in the cavity 10 as shown in FIG. 5 (c) has a shape in which the relatively thick central portion is convex and the relatively thin both ends are downward. When the molding is performed in the cavity 10 So that deformation of the central portion occurs while the both ends are raised to the upper portion. As a result of the deformation, the door scuff shape originally intended is obtained.

Hereinafter, the deformation correction injection molding apparatus according to the present invention will be described in detail. The deformation correction injection molding apparatus according to the present invention is characterized by comprising the deformation correcting mold and a control section.

As described above, the deformation correcting mold is characterized in that the cavity 10, which is formed in mold closing, includes an opposite shape that cancels the deformation occurring in the molding process.

The controller activates the heating means 30 so that the upper core 120 and the lower core 220 are respectively heated to a predetermined temperature and the upper core 120 and the lower core 220 are heated to a predetermined temperature And operates the cooling unit 40 to cool the upper core 120 and the lower core 220 to a predetermined temperature when the molding material is injected into the cavity 10. The control unit may be a control module of an injection molding machine connected to the deformation correcting mold.

Meanwhile, the controller may control the cooling temperature of the lower core 220 to be higher by 60 to 100 ° C than the cooling temperature of the upper core 120 during mold closing. see.

Fig. 7 shows a flowchart of the deformation correction injection molding method according to the present invention. Hereinafter, the deformation correction injection molding method according to the present invention will be described in detail with reference to the drawings.

Referring to FIG. 7, the deformation correction injection molding method according to the present invention is a deformation correction injection molding method using the deformation correcting mold, and includes a heating step S10, an injection step S20, a cooling step S30, (S40).

The heating step (S10) is a step of heating the upper core 110 and the lower core 210 to a predetermined temperature in the open state. Through this step, sufficient heating can be performed before the molten resin is filled in the cavity 10, and fluidity and transferability in the mold are improved. The specific set temperature may vary depending on the molding material and the molding.

In the injection step S20, the lower mold 200 is moved so that the upper core 110 and the lower core 210 are heated to a predetermined temperature, and the cavity 10 is filled with a molding material . In this step, since the upper core 110 and the lower core 210 are heated sufficiently, the molding is smoothly performed.

The cooling step S30 is a step of cooling the upper core 110 and the lower core 210 to a predetermined temperature in a state of filling the molding material. By rapidly lowering the temperature of the mold through this step, the molding can be completed quickly without deformation. It is preferable that the cooling step is performed in a state where the cooling temperature of the lower core 210 is higher than the cooling temperature of the upper core 110 by 60 to 100 ° C.

The taking-out step S40 is a step of moving the lower mold 200 to make a mold opening state and taking out the molded article from the cavity 10. [ In this step, injection molding is completed. Since the molded article taken out to the outside in this step has a shape opposite to that of the cavity 10, the shape and size of the original article are satisfied as a result of the deformation.

According to the deformation correction injection molding method of the present invention, the deformation problem is solved by the deformation correcting mold, and the rapid heating and quenching cycles can be performed without loss of the productivity of the injection molding, . The heating of the upper core 110 and the lower core 210 is performed before the filling of the molten resin through the heating step S10 and efficient quenching is performed through the cooling step S30 . Such a deformation correction injection molding method may be implemented by a deformation correcting mold according to the present invention and a deformation correcting injection molding apparatus including the same.

Hereinafter, with respect to injection molding of a door scuff having a size of 440 x 47, a center portion having a thickness of 4.7 mm, and a remaining portion having a thickness of 2.5 mm, a deformation correcting mold according to an embodiment of the present invention, Test results for verification of device and method are examined.

8, a door scuff having a size of 440 x 47 and a size of 4.7 mm in the central portion and 2.5 mm in thickness was used as the cooling temperature on the upper side of 100 DEG C and 130 DEG C on the lower side, The gate for the flow resin flowing into the cavity shows the results of measuring the deformation by applying a fan gate (40 mm) to the center portion by injection molding.

TEST 1 is an example of deformation measurement test of a door scuff formed in a cavity in which a cavity corresponding to the size and shape of the product is formed and the cavity does not include any opposite shape, And TEST 3 is a deformation measurement test example of a door scuff formed in a cavity in which an opposite shape curved at a constant curvature is applied so that both ends are sagged downward by 3 mm with respect to a center portion of the negative shape corresponding to the size and shape In which the opposite ends curved at a constant curvature so that both ends are sagged downward by 5 mm with respect to the central portion as a reference.

In the case of TEST 1, it was found that the deformation of the center part of 3.1 mm occurred compared with the design size of the door scuff. In the case of TEST 2, the center part was convex 0.2 mm in comparison with the design size of the door scuff . In the case of TEST 3, it was found that the deformation of the center portion of 1.5 mm was caused by the comparison with the design size of the door scuff.

Specifically, in the case of TEST 2, deformation occurred at the center portion of 2.8 mm after molding, and the result that the opposite portion was included in the cavity was formed, and the center portion was formed by 3 mm convex contouring compared with the design size of the door scuff, In the case of TEST 3, deformation of the central portion of 6.5 mm was caused by deformation of the cavity, and the center portion of the cavity was inverted by 5 mm compared with the design size of the door scuff, The center part of the deformation is 1.5 mm.

8, a door scuff having a size of 440 x 47 and having a size of 4.7 mm in the center portion and 2.5 mm in thickness in the remaining portion is cooled at a cooling temperature of 100 DEG C lower than the upper cooling temperature (130 mm), and the gate to which the flow resin flows into the cavity from the runner is curved so that the center part is convexed at 3 mm compared with the both ends when the fan gate (40 mm) It is preferable to use a cavity having a quasi-opposing shape. That is, in the test example of FIG. 8, the opposite shape suitable for the cavities for molding the door scuffs has a curvature so that the center portion is convexed at 3 mm compared to both sides.

Fig. 9 shows an additional test test example for verification of the test example of Fig. In FIG. 9, the portion indicated by 'curvature point' means the central portion where the deflection phenomenon occurs, and the portion expressed by 'correction R' means the opposite shape. The test example of FIG. 7 uses a cavity having an opposite shape that gives a curvature so that the center portion has a convex shape compared to both ends, as in the test example of FIG. 6. The lower cooling temperature is fixed at 130 占 폚, The upper side cooling temperature is changed in the range of 100 to 110 DEG C, and three gates through which the flow resin flows into the cavity from the runner are provided.

FIG. 10 shows the results of the deformation measurement according to the test example of FIG. 9, which shows that the center portion has opposite curvatures (2.4 inches, 2.4 mm, 2.6 mm, 2.8 mm, and 3.0 mm, respectively) Mm, 2.6 mm, 2.8 mm, and 3.0 mm), there are cases in which there is a case where the product size of the product is satisfied as a result of deformation among the products formed in the cavity. In consideration of the variation of the cooling temperature on the upper side, the fact that the cavity having a contrary shape giving a certain curvature so that the center portion is convex at 2.6 mm compared to both ends, Can be confirmed. That is, in this case, the most suitable opposite shape capable of offsetting the deformation of the molded product is a shape in which the central portion is curved with a constant convexity of 2.6 mm compared with both side ends.

In Table 1 below, a door scuff having a size of 440 x 47, the center portion having a thickness of 4.7 mm and the remaining portion having a thickness of 2.5 mm is injection-molded, and the gate through which the flow resin flows into the cavity from the runner The cavity with the opposite shape to which a constant curvature was applied so that the center portion of the fan gate was convexed at 2.6 mm compared to the both ends was applied to the fan gate (40 mm), and the cooling temperature of the upper side, the cooling temperature of the lower side, The result of measurement of the deformation amount of the test specimens varied and injection molded is shown. The amount of deformation here means the difference from the design size and formation of the original product that ultimately occurred as a result of the deformation, as described in connection with Figs. 6-8.

Repressive
(Bar) Holding time
(Sec) Cooling temperature (℃) Strain
(Mm) Upper Lower 120 9 70 70 0.0 90 9 35 75 -0.1 120 9 35 75 -0.1 70 9 65 35 0.0 90 9 65 35 -0.1 120 9 65 35 -0.1 90 9 35 60 -0.1 120 9 35 60 0.0

As can be seen from Table 1, it can be seen that the use of a mold including a cavity having a shape opposite to that of the deformation correcting mold according to the present invention, . 11 shows photographs taken by injection molding at a holding pressure of 120 bar, a holding time of 9 seconds, a cooling temperature of 65 ° C on the upper side and a cooling temperature of 35 ° C on the lower side in Table 1. In addition, In the case of the examples, since the weld line can not be minimized, the appearance quality is somewhat problematic.

In Table 2 below, the same cavity as that in the test example of Table 1 is used. In comparison with the test examples in Table 1, the lower cooling temperature is set higher than the upper cooling temperature, and the difference is set at 60 캜 and 100 캜, The deformation of one test example is shown.

Repressive
(Bar) Holding time
(Sec) Cooling temperature (℃) Strain
(Mm) Upper Lower 90 9 30 130 0.0 120 9 30 130 0.0 120 9 54 114 0.0

Table 2 shows that, as in Table 1, when the deformation correcting mold according to the present invention is used, it is possible to minimize deformation due to deformation by canceling deformation of the product. 12 shows photographs taken by injection molding at a holding pressure of 120 bar, a holding time of 9 seconds, an upper cooling temperature of 30 占 폚 and a lower cooling temperature of 130 占 폚 in Table 2. In addition, In the case of the examples, the weld line was also minimized and the appearance quality was improved.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Should be interpreted as falling within the scope of.

10: cavity 11: first cavity 12: second cavity
100: upper mold
110: upper fixing plate 120: upper core
130: upper fixing table 140:
200: Lower mold
210: lower moving plate 220: lower core
230: lower fixing table 240:

Claims (11)

For injection molding of moldings,
An upper fixing plate, an upper core accommodated in the upper fixing plate, a heating unit disposed in a portion of the upper fixing plate adjacent to the upper core to heat the upper core, and a heating unit disposed in a portion of the upper fixing plate adjacent to the upper core, An upper mold including cooling means for cooling the upper mold,
A lower moving plate, a lower core accommodated in the lower moving plate, a heating means disposed in a portion of the lower moving plate adjacent to the lower core to heat the lower core, and a portion of the lower moving plate adjacent to the lower core And a cooling means for cooling the lower core,
Wherein when the upper mold and the lower mold are closed, a cavity having a negative shape complementary to the shape of the molding is formed by the upper core and the lower core, the cavity being capable of offsetting the deformation of the molding And a second cavity forming a portion other than the thick portion of the molding, wherein the second cavity is formed continuously with the first cavity A deformation correcting mold which is bent in a direction to project the first cavity upward in a convex manner; And
Wherein the heating means is operated such that the upper core and the lower core are respectively heated to a set temperature, and when the upper core and the lower core are heated to respective set temperatures and the molding material is injected into the cavity, A control unit that activates the cooling means so that the core is cooled to a set temperature, respectively; / RTI >
Wherein the controller controls the cooling temperature of the lower core to be kept higher than the cooling temperature of the upper core at the time of cooling.
delete The method according to claim 1,
Wherein the second cavity is symmetrically formed on both sides of the first cavity.
The method according to claim 1,
Wherein the first cavity and the second cavity have the same curvature and are curved.
delete delete The method according to claim 1,
Wherein the heating means is a heating tube to which a heating medium is supplied,
Wherein said cooling means is a cooling tube to which a cooling medium is supplied.
delete The method according to claim 1,
Wherein the controller controls the cooling temperature of the lower core to be maintained at 60 to 100 DEG C higher than the cooling temperature of the upper core at the time of cooling.
A deformation-corrected injection molding method using the deformation-corrected injection molding apparatus according to any one of claims 1, 3, 4, 7, and 9,
A heating step of heating the upper core and the lower core to a predetermined temperature respectively in the open state;
An injection step of moving the lower mold and filling the cavity with a molding material so that a mold is closed when the upper core and the lower core are respectively heated to a set temperature;
A cooling step of cooling the upper core and the lower core to a predetermined temperature while maintaining the cooling temperature of the lower core higher than the cooling temperature of the upper core in a filling state of the molding material;
A take-out step of moving the lower mold to form a mold and taking out the molded article from the cavity; Wherein the deformable injection molding method comprises:
11. The method of claim 10,
Wherein the cooling step is performed in a state where the cooling temperature of the lower core is maintained at 60 to 100 DEG C higher than the cooling temperature of the upper core.

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