Injection mold with secondary ejection function

Abstract

The utility model belongs to injection mold technical field, concretely relates to a kind of injection mold with two-stage ejection function, including lower die holder and upper die holder, the top of lower die holder is fixedly connected with fixed plate, the top of fixed plate four corners is vertically fixedly connected with several slide bars, several The slide bar is horizontally slidably connected with lower die plate, the bottom of upper die holder is fixedly connected with upper die plate, the bottom center of upper die plate is fixedly connected with upper die kernel, the top center of lower die plate is fixedly connected with lower die kernel, the center of lower die kernel is vertically provided with forming insert piece.The utility model has the beneficial effects that by being provided with sliding insert piece, first clamping block and second clamping block, the forming insert piece covered in the workpiece can be first separated from the workpiece when demolding the workpiece, then the workpiece is ejected by ejector pin, two-stage ejection of workpiece is realized, so that the workpiece can be effectively prevented from being damaged during demolding, and the forming quality of workpiece is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, specifically to an injection mold with a two-stage ejection function. Background Technology

[0002] Injection molds, as the core equipment for molding plastic products, occupy a pivotal position in industrial manufacturing. They inject molten plastic into a closed cavity under high pressure, which then cools and solidifies to form products with complex structures and high-precision dimensions. These molds are widely used in the automotive, electronics, medical, home appliance, and daily necessities industries. Injection molds exhibit diverse characteristics. Single-parting-face molds (two-plate type) have a simple structure and are suitable for single-cavity or multi-cavity production; double-parting-face molds (three-plate type) achieve automatic separation of solidified material in the gating system through the design of the intermediate plate and are often used for precision products with point gate feeding; side-parting and core-pulling molds solve the demolding problems of complex structures such as side holes and threads through mechanisms such as inclined guide pillars and hydraulic cylinders, and are widely used in automotive bumpers, gears, and other components.

[0003] Most existing injection molds use a single ejection method for demolding injection molded parts. This method is simple in structure and low in cost. However, for overmolded parts, using a single direct ejection method can easily cause the top of the part to dent, thereby damaging the part and affecting the molding quality. Utility Model Content

[0004] The purpose of this invention is to solve the problem that existing injection molds are prone to damaging workpieces when demolding overmolded workpieces.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] An injection mold with a two-stage ejection function includes a lower mold base and an upper mold base. A fixed plate is fixedly connected to the top of the lower mold base. Several sliding rods are vertically fixedly connected to the four corners of the top of the fixed plate. A lower mold plate is horizontally slidably connected between the sliding rods. An upper mold plate is fixedly connected to the bottom of the upper mold base. An upper mold core is fixedly connected to the bottom center of the upper mold plate. A lower mold core is fixedly connected to the top center of the lower mold plate. A molding insert is vertically disposed at the center of the lower mold core. The sidewall of the molding insert and the lower mold core enclose a molding cavity. The bottom end of the molding insert passes through the lower mold plate and is fixedly connected to the top center of the fixed plate via a base. The inner side of the lower mold base is vertically fixed... A plurality of guide rods are connected, and a top plate is horizontally slidably connected between the guide rods. The top plate includes an upper top plate and a lower top plate. A plurality of ejector pins are vertically fixedly connected to the center of the lower top plate. The top ends of the ejector pins extend through the fixed plate to the bottom of the cavity. The ejector pins are arranged around the molding insert. A pair of sliding inserts are symmetrically and horizontally slidably connected to both sides of the lower top plate along the base. A first locking block is provided at the top of the end of the sliding insert away from the base. A second locking block is vertically arranged through the middle of the sliding insert. A locking groove is opened at the bottom of the first locking block where it connects with the sliding insert. A bevel is opened at the bottom of the second locking block where it connects with the middle of the sliding insert.

[0007] Furthermore, a first spring is horizontally arranged between the end of the sliding insert facing the base and the inner sidewall of the lower top plate.

[0008] Furthermore, the top of the first card block is fixedly connected to the bottom of the lower template, and the top of the second card block is fixedly connected to the bottom of the fixing plate.

[0009] Furthermore, a plurality of second springs are connected between the top of the upper plate and the bottom of the lower template, and the second springs are arranged around the outside of the guide rod.

[0010] Furthermore, the bottom of the lower template is vertically fixedly connected with several limiting bolts, and the top of the upper plate is fixedly connected with several ejection limiting blocks.

[0011] Furthermore, the head of the limiting bolt extends through the fixing plate to the lower side of the fixing plate.

[0012] Furthermore, a KO hole is provided at the bottom of the lower mold base.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. The present invention relates to an injection mold with a two-stage ejection function. By setting a sliding insert, a first locking block and a second locking block, the molding insert encased inside the workpiece can be detached from the workpiece first during demolding, and then the workpiece is ejected by the ejector pin, thereby realizing two-stage ejection of the workpiece. This can effectively avoid damage to the workpiece during demolding and improve the molding quality of the workpiece. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of an injection mold with a two-stage ejection function according to the present invention.

[0016] Figure 2 This is a schematic diagram of the internal structure of the lower mold base of an injection mold with a two-stage ejection function according to the present invention.

[0017] Figure 3 This is an enlarged schematic diagram of section A of an injection mold with a two-stage ejection function according to the present invention.

[0018] Figure 4 This is a schematic diagram of an ejector pin structure for an injection mold with a two-stage ejection function according to the present invention.

[0019] Figure 5 This is a schematic diagram of the internal structure of the lower template of an injection mold with a two-stage ejection function according to the present invention.

[0020] Figure 6 This is a schematic diagram of a sliding insert structure for an injection mold with a two-stage ejection function according to the present invention.

[0021] In the diagram: 1. Lower mold base; 2. Upper mold base; 3. Lower template; 4. Upper template; 5. Lower mold core; 6. Guide rod; 7. Top plate; 701. Upper top plate; 702. Lower top plate; 8. Sliding rod; 9. Fixing plate; 10. Sliding insert; 11. First locking block; 12. Second locking block; 13. Inclined surface; 14. Molding insert; 15. Cavity; 16. Base; 17. Ejector pin; 18. Limiting bolt; 19. First spring; 20. Ejection limiting block; 21. KO hole; 22. Second spring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-6The injection mold with a two-stage ejection function in this embodiment includes a lower mold base 1 and an upper mold base 2. A fixing plate 9 is fixedly connected to the top of the lower mold base 1. Several sliding rods 8 are vertically fixedly connected to the four corners of the top of the fixing plate 9. A lower mold plate 3 is horizontally slidably connected between the sliding rods 8. An upper mold plate 4 is fixedly connected to the bottom of the upper mold base 2. An upper mold core is fixedly connected to the bottom center of the upper mold plate 4. A lower mold core 5 is fixedly connected to the top center of the lower mold plate 3. A molding insert 14 is vertically arranged at the center of the lower mold core 5. The side wall of the molding insert 14 and the lower mold core 5 surround a molding cavity 15. The bottom end of the molding insert 14 passes through the lower mold plate 3 and the top center of the fixing plate 9 and is fixedly connected by a base 16. Several guide rods 6 are vertically fixedly connected to the inner side of the lower mold base 1. A top plate 7 is horizontally slidably connected. The top plate 7 includes an upper top plate 701 and a lower top plate 702. Several ejector pins 17 are vertically fixedly connected to the center of the lower top plate 702. The top ends of the ejector pins 17 extend through the fixed plate 9 to the bottom of the cavity 15. Several ejector pins 17 are arranged around the molding insert 14. A pair of sliding inserts 10 are symmetrically horizontally slidably connected to both sides of the lower top plate 702 along the base 16. A first locking block 11 is provided at the top of the end of the sliding insert 10 away from the base 16. A second locking block 12 is vertically arranged through the middle of the sliding insert 10. A locking groove is opened at the bottom of the first locking block 11 where it connects with the sliding insert 10. A bevel 13 is opened at the bottom of the second locking block 12 where it connects with the middle of the sliding insert 10. A KO hole 21 is opened at the bottom of the lower mold base 1. During molding, the upper mold plate 4 and the lower mold plate 3 are brought into contact. Liquid raw material is then injected into the cavity 15, and the workpiece is molded through the cavity 15. After molding, the upper mold plate 4 separates from the lower mold plate 3. The injection molding machine ejector roller pushes the ejector plate 7 upward through the KO hole 21, causing the ejector pin 17 to move upward, generating an upward thrust on the workpiece within the cavity 15. As the ejector plate 7 moves upward, it drives the sliding inserts 10, which are slidably connected to both sides of the lower ejector plate 702, to move upward. The sliding inserts 10, in turn, drive the first locking block 11 upward, causing the lower mold plate 3, connected to the top of the first locking block 11, to move upward along the slide rod 8. The upward movement of the lower mold plate 3 drives the lower mold... The lower mold insert 5 moves upward, causing the workpiece to move upward synchronously with the lower mold insert 5, thus causing the molding insert 14 to detach from the interior of the workpiece. When the sliding insert 10 moves upward, it abuts against the second locking block 12 through the inclined surface 13, causing the sliding insert 10 to detach from the locking groove at the bottom of the first locking block 11 under the pushing force of the second locking block 12. This causes the lower mold plate 3 to stop moving upward after rising a certain distance without being pushed by the second locking block 12. At this time, the ejector pin 17 continues to move upward under the pushing force of the top plate 7, ejecting the workpiece detached from the molding insert 14, thus realizing the two-stage ejection of the workpiece. This can effectively avoid damage to the workpiece during demolding and improve the molding quality of the workpiece.

[0024] A first spring 19 is horizontally arranged between the end of the sliding insert 10 facing the base 16 and the inner sidewall of the lower top plate 702. By providing the first spring 19, the sliding insert 10 can be automatically reset after the workpiece is demolded.

[0025] The top of the first locking block 11 is fixedly connected to the bottom of the lower template 3, and the top of the second locking block 12 is fixedly connected to the bottom of the fixing plate 9.

[0026] Several second springs 22 are connected between the top of the upper plate 701 and the bottom of the lower template 3. The second springs 22 are arranged around the outside of the guide rod 6. When the upper plate 7 moves upward, the second springs 22 are compressed, which generates an upward thrust on the lower template 3 at the top, preventing the first locking block 11 from disengaging from the sliding insert 10 and the lower template 3 from falling under the action of gravity.

[0027] The bottom of the lower template 3 is vertically fixedly connected with several limiting bolts 18, and the top of the upper plate 701 is fixedly connected with several ejection limiting blocks 20. The heads of the limiting bolts 18 extend through the fixing plate 9 to the lower side of the fixing plate 9. When the lower template 3 moves upward, the limiting bolts 18 move upward accordingly. The limiting bolts 18 can limit the lower template 3 when the first locking block 11 disengages from the sliding insert 10, preventing the lower template 3 from continuing to move upward under the pushing force of the second spring 22. The ejection limiting blocks 20 can limit the top plate 7, preventing the ejector pin 17 from being ejected too high and causing the workpiece to fall.

[0028] Working principle: During molding, the upper mold plate 4 and the lower mold plate 3 are brought into contact. Liquid raw material is then injected into the cavity 15, and the workpiece is molded through the cavity 15. After molding, the upper mold plate 4 separates from the lower mold plate 3. The injection molding machine's ejector roller pushes the ejector plate 7 upward through the KO hole 21, causing the ejector pin 17 to move upward, generating an upward thrust on the workpiece within the cavity 15. As the ejector plate 7 moves upward, it drives the sliding inserts 10, which are slidably connected to both sides of the lower ejector plate 702, to move upward as well. The sliding inserts 10 move upward, causing the first locking block 11 to move upward as well, resulting in the lower mold plate 3, connected to the top of the first locking block 11, moving upward along the slide rod 8. The lower mold plate 3 moves upward, causing the lower mold core 5 to move upward as well, thus allowing the workpiece to move upward synchronously with the lower mold core 5, causing the molding insert 14 to detach from the workpiece. As the sliding insert 10 moves upward, it abuts against the second locking block 12 through the inclined surface 13, causing the sliding insert 10 to detach under the thrust of the second locking block 12. The groove at the bottom of the first locking block 11 allows the lower template 3 to stop moving upward after rising a certain distance without being pushed by the second locking block 12. When the top plate 7 moves upward, the second spring 22 is compressed, generating an upward pushing force on the lower template 3 at the top, preventing the lower template 3 from falling under gravity due to the first locking block 11 disengaging from the sliding insert 10. When the lower template 3 moves upward, the limiting bolt 18 moves upward accordingly. The limiting bolt 18 can limit the lower template 3 when the first locking block 11 disengages from the sliding insert 10, preventing the lower template 3 from continuing to move upward under the pushing force of the second spring 22. At this time, the ejector pin 17 continues to move upward under the pushing force of the top plate 7, ejecting the workpiece that has disengaged from the forming insert 14. The ejection limiting block 20 can limit the top plate 7, preventing the ejector pin 17 from ejecting too high and causing the workpiece to fall. Through the above steps, a two-stage ejection of the workpiece can be achieved, which can effectively prevent the workpiece from being damaged during demolding and improve the forming quality of the workpiece.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection mold with a two-stage ejection function, characterized in that: The system includes a lower mold base (1) and an upper mold base (2). A fixed plate (9) is fixedly connected to the top of the lower mold base (1). Several sliding rods (8) are vertically fixedly connected to the four corners of the top of the fixed plate (9). A lower template (3) is horizontally slidably connected between the sliding rods (8). An upper template (4) is fixedly connected to the bottom of the upper mold base (2). An upper mold core is fixedly connected to the bottom center of the upper template (4). A lower mold core (5) is fixedly connected to the top center of the lower template (3). A forming insert (14) is vertically arranged at the center of the lower mold core (5). The side wall of the forming insert (14) and the lower mold core (5) form a forming cavity (15). The bottom end of the forming insert (14) passes through the lower template (3) and the top center of the fixed plate (9) and is fixedly connected by a base (16). Several guide rods (6) are vertically fixedly connected to the inner side of the lower mold base (1). A top plate (7) is horizontally slidably connected to the bottom plate (702). The top plate (7) includes an upper top plate (701) and a lower top plate (702). A number of ejector pins (17) are vertically fixedly connected to the center of the lower top plate (702). The top of the ejector pins (17) extends through the fixed plate (9) to the bottom of the cavity (15). The ejector pins (17) are arranged around the molding insert (14). A pair of sliding inserts (10) are symmetrically horizontally slidably connected to the two sides of the lower top plate (702) along the base (16). A first locking block (11) is provided at the top of the end of the sliding insert (10) away from the base (16). A second locking block (12) is vertically arranged through the middle of the sliding insert (10). A slot is provided at the bottom of the first locking block (11) and the connection between it and the sliding insert (10). A slope (13) is provided at the bottom of the second locking block (12) and the connection between it and the middle of the sliding insert (10).

2. The injection mold with a two-stage ejection function according to claim 1, characterized in that: A first spring (19) is horizontally disposed between the end of the sliding insert (10) facing the base (16) and the inner wall of the lower top plate (702).

3. The injection mold with a two-stage ejection function according to claim 1, characterized in that: The top of the first card block (11) is fixedly connected to the bottom of the lower template (3), and the top of the second card block (12) is fixedly connected to the bottom of the fixing plate (9).

4. An injection mold with a two-stage ejection function according to claim 1, characterized in that: A plurality of second springs (22) are connected between the top of the upper plate (701) and the bottom of the lower template (3), and the second springs (22) are arranged around the outside of the guide rod (6).

5. An injection mold with a two-stage ejection function according to claim 1, characterized in that: The bottom of the lower template (3) is vertically fixedly connected with several limiting bolts (18), and the top of the upper plate (701) is fixedly connected with several ejection limiting blocks (20).

6. An injection mold with a two-stage ejection function according to claim 5, characterized in that: The head of the limiting bolt (18) extends through the fixing plate (9) to the lower side of the fixing plate (9).

7. An injection mold with a two-stage ejection function according to claim 1, characterized in that: The bottom of the lower mold base (1) is provided with a KO hole (21).

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