Demolding structure for injection molding encapsulation mold

Abstract

The demolding structure comprises a top mounting plate, a sprue plate, an upper mold plate, a lower mold plate, a bottom mounting plate and a guide column, an injection mold cavity is formed in the bottom of the upper mold plate, a product profiling cavity is formed in the top of the lower mold plate, a plurality of pressing blocks in a vertical posture are distributed in the injection mold cavity of the upper mold plate, and the bottom mounting plate is connected with the guide column. The upper end of the pressing block is connected to the upper die plate through a spring. And a mold opening lock catch is arranged between the outer side walls of the upper mold plate and the lower mold plate. According to the utility model, one side of a sheet metal part to be encapsulated is arranged on the upper template, the spring and the pressing block are additionally arranged in the upper template during mold opening, so that a product is left on the lower template, and the mold opening sequence is controlled through the mold opening lock catch because no wrapping force is generated between the other side of the sheet metal part and the lower template; the unforeseen circumstances that the product falls off when the sprue is cut off and the upper mold plate is opened are avoided, so that the product is ensured to be successfully left on the lower mold plate, and then the product is ejected upwards through the ejector rod in the mold to finish demolding.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molds, in particular to a demoulding structure for an injection molding and overmolding mold. Background Art

[0002] For a certain existing in-vehicle display injection molding and overmolding product, during production, an overmolding decorative strip needs to be injection molded on a sheet metal part. This product belongs to an in-vehicle exterior decorative part and has high aesthetic requirements for its overmolded surface. Ejector marks and other mold structure marks are not allowed, and no scratches are allowed on the sheet metal part either.

[0003] Currently, the production of this in-vehicle display injection molding and overmolding product mainly relies on injection molds. As a thin sheet-like part, the sheet metal part needs to be injection molded and overmolded on one side and maintained in the sheet metal state on the other side. Due to the characteristics of the injection mold, the side with overmolding will generate a clamping force on the mold after the plastic cools and shrinks, thus causing the product to remain in the mold. Coupled with the appearance requirements for the overmolded surface and no ejector marks for demoulding, it is usually considered to set the overmolded side on the upper mold of the mold, and the side without overmolding on the lower mold of the mold. However, how to make the product remain on the lower mold after injection molding and prevent the product from adhering to the upper mold due to the plastic clamping force and not affect the smooth demoulding is the current technical difficulty. Summary of the Utility Model

[0004] In view of this, the purpose of the utility model is to provide a demoulding structure for an injection molding and overmolding mold, with a simple structural layout, realizing the function of quickly demoulding the injection molding and overmolding part.

[0005] To achieve the above purpose, the utility model adopts the following content:

[0006] A demoulding structure for an injection molding and overmolding mold provided by the utility model includes a top mounting plate, a sprue plate, an upper template, a lower template, a bottom mounting plate, and guide pillars. The bottom of the upper template has an injection mold cavity, and the top of the lower template has a product profiling cavity, where:

[0007] A number of vertically arranged pressing blocks are arranged in the injection mold cavity of the upper template, and the upper ends of the pressing blocks are connected to the upper template through springs;

[0008] An opening mold lock is arranged between the outer side walls of the upper template and the lower template;

[0009] The mold opening latch includes an upper seat, a lower seat, and a locking rod body. An upper installation groove and a lower installation groove that penetrate up and down are respectively arranged in the upper seat and the lower seat. A swinging lock rod with a top protruding outward is hinged in the lower installation groove. A lock head that extends horizontally into the upper installation groove is movably embedded in the upper seat through a spring. A limiting portion and a clamping groove that can achieve a locking fit are respectively formed at the head end of the lock head and the top surface of the swinging lock rod. The upper end of the locking rod body is connected to the top mounting plate, and the lower end of the locking rod body can vertically penetrate through the upper installation groove and the lower installation groove in sequence to force a locking fit between the lock head and the swinging lock rod.

[0010] According to a demolding structure for an injection molding and overmolding die provided by the present utility model, an inclined contact surface is formed at the top of the swinging lock rod, and an inverted inclined portion that cooperates with the inclined contact surface is formed at one side of the lower end of the locking rod body. In this way, during the mold closing process of the upper mold plate and the lower mold plate, the locking rod body needs to pass through the upper installation groove and the lower installation groove from top to bottom. Through the design of the inverted inclined portion and the inclined contact surface, it is convenient for the locking rod body to smoothly squeeze into the upper installation groove from the right side of the swinging lock rod, so as to force the swinging lock rod to rotate leftward until it forms a locking fit with the lock head, and at this time, the mold closing is completed.

[0011] According to a demolding structure for an injection molding and overmolding die provided by the present utility model, a top protrusion that extends horizontally into the lower installation groove is movably embedded in the lower seat through a spring, and a spherical contact portion is formed at the head end of the top protrusion. In this way, after the locking rod body exits from the upper installation groove and the lower installation groove, the locking rod body loses the external extrusion force, and under the action of the top protrusion, the locking rod body will gradually rotate outward, so that the locking fit relationship between the locking rod body and the lock head is terminated.

[0012] According to a demolding structure for an injection molding and overmolding die provided by the present utility model, the limiting portion is in a pointed shape, and the clamping groove is in a hooked shape. In this way, through the tight fit between the pointed portion and the hooked portion, the tight locking fit between the limiting portion and the clamping groove is realized, and it is avoided that loosening occurs easily.

[0013] According to a demolding structure for an injection molding and overmolding die provided by the present utility model, the length of the guide post is greater than the length of the locking rod body. In this way, when the locking rod body exits from the upper seat and the lower seat, the guide post between the upper mold plate and the lower mold plate will still play a limiting effect, ensuring the accuracy during demolding.

[0014] According to a demolding structure for an injection molding and overmolding die provided by the present utility model, in the initial state, the bottom end surfaces of several of the pressing blocks are all on the same horizontal plane. In this way, it can ensure that the pressure borne by each contact point when the pressing blocks act on the sheet metal part is evenly distributed, avoiding pressure concentration or imbalance caused by height differences, thereby improving the quality and yield rate of the sheet metal part overmolding.

[0015] Compared with the prior art, the utility model has the following technical effects: The structure of the utility model is simple and reasonably designed. Place the side of the sheet metal part to be pre-coated with glue on the upper template. When the mold is opened, through the additional springs and pressure blocks in the upper template, the product remains on the lower template. Since there is no clamping force generated between the other side of the sheet metal part and the lower template, control the mold opening sequence through the mold opening lock to avoid accidental situations such as the gate being cut off and the product falling when the upper template is opened, so as to ensure that the product successfully remains on the lower template. Then, the product is pushed upward by the ejector rod in the mold to complete demolding; the demolding structure of the utility model improves the practicability of the injection molding with glue for sheet metal parts and the product forming quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following further describes in detail the specific implementation manners of the utility model with reference to the accompanying drawings.

[0017] Figure 1 FIG. is a schematic diagram of the use effect of a demolding structure for an injection molding with glue mold according to an embodiment of the utility model;

[0018] Figure 2 FIG. is a schematic diagram of the structure of the mold opening lock according to an embodiment of the utility model;

[0019] 1 - top mounting plate, 2 - gate plate, 3 - upper template, 4 - lower template, 5 - bottom mounting plate, 6 - guide post, 7 - ejector rod, 8 - ejector bar; 10 - pressure block, 20 - mold opening lock, a - spring, 21 - upper seat, 22 - lower seat, 23 - locking rod body, 24 - swing locking rod, 25 - lock head, 26 - ejecting head, 211 - upper mounting groove, 221 - lower mounting groove, 231 - inverted inclined portion, 241 - card slot, 242 - inclined contact surface, 251 - limiting portion. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] In order to more clearly illustrate the utility model, the following further describes the utility model with reference to the preferred embodiments. Those skilled in the art should understand that the specific content described below is illustrative rather than restrictive, and should not be used to limit the protection scope of the utility model.

[0021] In the description of the utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the utility model can be understood according to specific situations.

[0022] Please refer to Figure 1 and Figure 2As shown in the figure. An ejection structure for an injection molding and overmolding die is proposed in an embodiment of the present utility model. Based on the improved design of a conventional injection mold, for example, it also has a top mounting plate 1, a sprue plate 2, an upper template 3, a lower template 4, a bottom mounting plate 5, guide pillars 6, ejector pins 7, and ejector rods 8. The sprue plate 2 is fixedly arranged at the bottom of the top mounting plate 1. The top ends of the guide pillars 6 are fixedly arranged on the top mounting plate 1 and the sprue plate 2. The lower ends of the guide pillars 6 can freely penetrate through the lower template 4 and the bottom mounting plate 5. The ejector rod 8 mainly controls the upward movement of the ejector pins 7 to achieve the final ejection action of the molded product. There is a sunken injection mold cavity in the middle of the bottom of the upper template 3, and there is a sunken product profiling cavity in the middle of the top of the lower template 4. The product profiling cavity is used to stably place and fix the product to be injection-molded and overmolded, such as a certain sheet metal part. It should be noted that some details of the injection mold in this application are not disclosed in detail because they do not belong to the improvement points of this application and can be considered as the structure of a general injection mold by default.

[0023] The main design points of this application are as follows:

[0024] A number of vertically arranged pressing blocks 10 are arranged in the injection mold cavity of the upper template 3. The upper ends of the pressing blocks 10 are connected to the upper template 3 through spring a. These pressing blocks can simultaneously act downward on the surface of the sheet metal part placed in the product profiling cavity to prevent the phenomenon that the product cannot be smoothly separated from the upper template due to the generation of a clamping force between the final overmolded surface and the upper template.

[0025] In addition, an opening mold lock 20 is arranged between the outer side walls of the upper template 3 and the lower template 4. The opening mold lock 20 includes an upper seat 21, a lower seat 22, and a locking rod body 23. The upper seat 21 and the lower seat 22 are respectively arranged on the upper template 3 and the lower template 4 and are in a vertically corresponding relationship. An upper installation groove 211 and a lower installation groove 221 that penetrate up and down are respectively arranged in the upper seat 21 and the lower seat 22. Similarly, the upper installation groove 211 and the lower installation groove 221 are also in a vertically corresponding relationship; a swinging lock rod 24 with a top protruding outward is hinged and connected in the lower installation groove 221. That is, when the upper template 3 and the lower template 4 are closed, the upper part of the swinging lock rod 24 can fall into the upper installation groove 211. A lock head 25 that horizontally extends into the upper installation groove 211 is movably embedded in the upper seat 21 through spring a. That is, under the action of an external force, the lock head 25 can horizontally retract or protrude outward; a limiting part 251 and a clamping groove 241 that can achieve lock cooperation are respectively formed at the head end of the lock head 25 and the top surface of the swinging lock rod 24; the upper end of the locking rod body 23 is connected to the top mounting plate 1, and the lower end of the locking rod body 23 can vertically penetrate through the upper installation groove 211 and the lower installation groove 221 in sequence and is located on the right side of the swinging lock rod 24 to force a lock cooperation to be formed between the lock head 25 and the swinging lock rod 24.

[0026] The general working process of the ejection structure in this embodiment is as follows:

[0027] a. Place the sheet metal part in the product profiling cavity on the lower template 4 with the surface to be rubber-coated facing upward, and then close the injection mold.

[0028] b. After injection molding is completed, the injection mold is opened, and the top mounting plate 1 is lifted upward to initially separate the sprue plate 2 from the upper template 3, thus completing the separation action of the point gate from the product. At this time, the locking rod body 23 has not completely disengaged from the upper seat 21 and the lower seat 22, so the lock head 25 and the swing lock rod 24 still maintain a locking engagement state. Therefore, the upper template 3 and the lower template 4 cannot be separated.

[0029] c. Continue to lift the top mounting plate 1 upward until the locking rod body 23 withdraws from the upper seat 21 and the lower seat 22. At this time, the locking engagement state between the lock head 25 and the swing lock rod 24 is terminated, and the upper template 3 can be separated from the lower template 4. Moreover, under the elastic pressing action of several pressing blocks 10, the product will not move correspondingly with the movement of the upper template 3, and the product will successfully remain on the lower template.

[0030] d. Finally, the ejector rod 7 is controlled by the ejector bar 8 to move upward to eject the molded product from the product profiling cavity, completing the demolding.

[0031] In this embodiment, an inclined contact surface 242 is formed at the top of the swing lock rod 24, and an inverted inclined portion 231 that cooperates with the inclined contact surface 242 is formed at one side of the lower end of the locking rod body 23. In this way, during the mold closing process of the upper template and the lower template, the locking rod body needs to pass through the upper mounting groove and the lower mounting groove from top to bottom. Through the design of the inverted inclined portion and the inclined contact surface, it is convenient for the locking rod body to smoothly squeeze into the upper mounting groove from the right side of the swing lock rod, so as to force the swing lock rod to rotate leftward until it forms a locking engagement with the lock head. At this time, the mold closing is completed, which improves the mold closing efficiency to a certain extent and reduces the time for aligning the locking rod body with the upper mounting groove.

[0032] In this embodiment, a top protrusion 26 that extends horizontally downward into the lower mounting groove 221 is movably embedded in the lower seat 22 through spring a, and a spherical contact portion is formed at the head end of the top protrusion 26. In this way, after the locking rod body withdraws from the upper mounting groove and the lower mounting groove, the locking rod body loses the external extrusion force, and under the outward acting force of the top protrusion, the locking rod body will gradually rotate outward, terminating the locking engagement relationship between the locking rod body and the lock head.

[0033] In this embodiment, the limiting portion 251 is in a pointed shape, and the card slot 241 is in a hook shape. In this way, through the tight cooperation between the pointed part and the hook part, the tight locking engagement between the limiting portion and the card slot is realized, avoiding loosening easily.

[0034] In this embodiment, the length of the guide post 6 is greater than the length of the locking rod body 23. In this way, when the locking rod body is withdrawn from the upper seat and the lower seat, the guide post between the upper template and the lower template will still play a limiting effect, ensuring the accuracy during mold splitting and avoiding the fracture of the gate post.

[0035] In addition, it is worth noting that in the initial state, the bottom end faces of several pressing blocks 10 are all on the same horizontal plane. In this way, it can ensure that the pressure borne by each contact point is evenly distributed when each pressing block acts on the sheet metal part, avoiding pressure concentration or imbalance caused by height differences, thereby improving the quality and yield rate of the sheet metal part encapsulation.

[0036] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to enumerate all the implementation manners here. Any obvious changes or modifications derived from the technical solutions of the present invention still fall within the protection scope of the present invention.

Claims

1. A demoulding structure for an injection molding mold, comprising a top mounting plate, a gate plate, an upper mold plate, a lower mold plate, a bottom mounting plate, and a guide column, wherein the bottom of the upper mold plate has an injection mold cavity, and the top of the lower mold plate has a product-shaped cavity, characterized in that: A plurality of vertical pressing blocks are arranged in the injection mold cavity of the upper mold plate, and the upper ends of the pressing blocks are connected to the upper mold plate through springs; A mold opening lock buckle is provided between the outer side walls of the upper mold plate and the lower mold plate; The open mold lock comprises an upper seat, a lower seat and a locking rod body, wherein an upper mounting groove and a lower mounting groove are respectively provided in the upper seat and the lower seat, and a swing lock rod with a top protruding outward is hingedly connected in the lower mounting groove, and a lock head horizontally extending to the upper mounting groove is embedded in the upper seat through the movement of a spring, and a limit portion and a slot for realizing lock fit are respectively formed on the head end of the lock head and the top surface of the swing lock rod, and the upper end of the locking rod body is connected to the top mounting plate, and the lower end of the locking rod body can vertically downwardly pass through the upper mounting groove and the lower mounting groove in sequence to force a lock fit between the lock head and the swing lock rod.

2. A demoulding structure for an injection molding mold according to claim 1, characterized in that: An inclined contact surface is formed on the top of the swing lock rod, and an inverted inclined portion matching the inclined contact surface is formed on one side of the lower end of the locking rod body.

3. A demoulding structure for an injection molding mold according to claim 1, characterized in that: An ejector head is embedded in the lower seat through spring movement and horizontally extends toward the lower mounting groove, and a spherical contact portion is formed at the head end of the ejector head.

4. A demoulding structure for an injection molding mold according to claim 1, characterized in that: The limiting portion is pointed, and the clamping slot is hook-shaped.

5. The demoulding structure for an injection molding mold according to claim 1, characterized in that: The length of the guide column is greater than the length of the locking rod body.

6. A demoulding structure for an injection molding mold according to claim 1, characterized in that: In the initial state, the bottom end surfaces of the plurality of pressing blocks are all on the same horizontal plane.

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