CN221873052U - Injection mold internal parting undercut deformation demoulding mechanism - Google Patents

Abstract

The injection mold has an internal parting, undercut, pulling, deforming and demolding mechanism, comprising an upper composite plate and a lower composite plate, a fixed template is arranged under the upper composite plate, a mold foot, an upper ejector plate, a lower ejector plate, a straight ejector rod and an inclined ejector rod are arranged on the lower composite plate, a movable template is arranged on the mold foot, a large straight ejector block and a large inclined ejector block are arranged on the movable template, a mold cavity is formed between the large straight ejector block, the large inclined ejector block and the fixed template, and there is a plastic product in the mold cavity, a pulling deformation device and a stripping baffle device are arranged in the large inclined ejector block, the pulling deformation device comprises a pulling deformation push block provided in the large inclined ejector block, a pulling trough is formed on the inner side of the pulling deformation push block, a pulling handle is molded in the pulling trough, a pulling deformation guide rail is arranged in the movable template, a push block guide rod is arranged in the guide block under the large inclined ejector block, the stripping baffle device comprises an inner core pulling insert connected to the inner core pulling guide rod in the large inclined ejector block, an inner core pulling guide rail is arranged in the movable template, and the inner core pulling guide rod cooperates with the inner core pulling guide rail.

Description

Injection mold internal parting undercut deformation demoulding mechanism

Technical Field

The utility model relates to an injection mold, in particular to a parting, undercut, pulling, deforming and demoulding mechanism inside the injection mold.

Background Art

When using injection molds to produce plastic products, if the plastic product to be manufactured is a car bumper, arc-shaped flanges 1' are formed on both sides of the car bumper, a side baffle is formed on one side of the flange 1', and an undercut 2' is formed under the flange. The traditional method is to set the parting surface 3' of the mold (i.e., the opening and closing position of the fixed mold plate and the movable mold plate, or the opening and closing position of the fixed mold plate 4' and the large inclined top block 5') at the upper part of the corner 6' of the flange and the undercut (i.e., the external parting, as shown in Figure 5), so that when the mold is opened, the corner 6' can directly escape from the fixed mold plate 4', and demolding is very convenient However, a corresponding parting line 7' will also appear on the upper part of the corner 6' of the automobile bumper. The parting line is located on the visible surface of the automobile bumper, which affects the appearance of the product. As manufacturers have higher and higher requirements for product appearance, it is necessary to set the parting line of the product on the invisible surface (i.e., the inner parting, located at the lower part of the corner of the flange and the undercut). This causes the corner to be stuck on the inner wall of the fixed mold plate. After the injection mold has injection-molded the automobile bumper, before the mold is opened, the corner needs to be pulled inward to deform it and disengage it from the fixed mold plate before the mold can continue to be opened. Therefore, someone applied for Chinese utility model patent 201020268501.5, and the patent name is "Parting mechanism in automobile bumper mold". During the sliding process of the guide rail in the V-shaped guide groove, the push block connecting rod and the push block pull the inclined top block to the right. During the rightward movement of the inclined top block, the product glue position is driven to move right to separate the product glue position from the main cavity. The disadvantage of this structure is that it only relies on the clamping force of the push block and the inclined top block on the product glue position to drive the product glue position to move right, and the reliability is poor. If the two do not clamp the product glue position, the product glue position will be reset and stuck on the inner wall of the main cavity under the action of elastic force, resulting in the product glue position being deformed or even broken when the mold is opened, affecting the yield rate.

Summary of the invention

The purpose of the utility model is to overcome the shortcomings of the existing technology and provide an injection mold internal parting undercut pulling and deforming demoulding mechanism with beautiful internal and external appearance of plastic products, good reliability of pulling and deforming action, improved plastic product yield, simple structure and convenient manufacturing.

The technical scheme of the mold-parting undercut pulling deformation demoulding mechanism of the utility model is as follows: it comprises an upper compound plate and a lower compound plate, an upper pad plate is arranged under the upper compound plate, a fixed mold plate is arranged under the upper pad plate, a mold foot is arranged on the lower compound plate, an upper ejector plate, a lower ejector plate, a straight ejector rod and an inclined ejector rod are arranged on the lower compound plate between the mold feet, a movable mold plate is arranged on the mold foot, a large straight ejector block and a large inclined ejector block are arranged on the movable mold plate, the straight ejector rod passes through the movable mold plate to connect the large straight ejector block, the inclined ejector rod passes through the movable mold plate to connect the large inclined ejector block, A mold cavity is formed between the large straight ejector block, the large inclined ejector block and the fixed mold plate, wherein there is an injection molded plastic product in the mold cavity, one side of the plastic product is provided with an arc-shaped downward flange, one side of the flange is provided with a side baffle, an inner parting undercut is provided under the flange, a parting line is provided at the bottom of the undercut, a corner is provided between the undercut and the ejector, and the corner is matched with the inner wall of the fixed mold plate, the large inclined ejector block is provided with a pulling deformation device at the inner parting undercut, the large inclined ejector block is provided with a baffle removal device on the inner wall of the side baffle, the pulling deformation The forming device includes a pulling and deforming push block in the large inclined top block, a pulling groove is formed on the inner side of the pulling and deforming push block located at the undercut, the pulling groove is communicated with the mold cavity, a pulling handle is injection-molded in the pulling groove, and the pulling handle is integrally connected with the inner wall of the undercut, a pulling and deforming guide rail is provided in the movable template, a pulling and deforming inclined section and a reset inclined section are formed in the pulling and deforming guide rail, a guide block is provided under the large inclined top block, a guide hole is formed in the guide block, a push block guide rod is provided in the guide hole, the push block guide rod is slidably matched with the guide hole, and the push block One end of the guide rod is formed with a push block slide groove, which cooperates with the tensile deformation guide rail, and the other end of the push block guide rod is fixedly connected to the tensile deformation push block. The debaffle device includes an inner core pulling insert arranged inside the large inclined top block above the tensile deformation push block, the inner core pulling insert cooperates with the inner wall of the side baffle and the upper surface of the inverted buckle, the inner core pulling insert is connected to the inner core pulling guide rod, an inner core pulling slide groove is formed on the inner core pulling guide rod, an inner core pulling guide rail is arranged in the movable template, and the inner core pulling slide groove cooperates with the inner core pulling guide rail.

Furthermore, the pulling groove is T-shaped, and the corresponding pulling handle is T-shaped.

Furthermore, a support rod is provided in the large inclined ejector block, the support rod and the large inclined ejector block are slidably matched, a groove is formed on one side of the deformable push block located on the support rod, and the support rod is slidably connected to the groove of the deformable push block.

The beneficial effects of the internal parting undercut and pulling and deforming demoulding mechanism of the injection mold of the utility model are as follows: first, the undercut of the plastic product adopts the internal parting structure to ensure its beautiful appearance; second, by forming a pulling groove in the pulling and deforming push block, the pulling groove is communicated with the mold cavity, during injection molding, the rubber material flows into the mold cavity to form a plastic product, and at the same time, the rubber material also flows into the pulling groove to form a pulling handle, and when the mold is opened, the pulling and deforming guide rail cooperates with the guide block to drive the pulling and deforming push block and the pulling handle to move inward, so that the undercut of the plastic product can be smoothly ejected from the fixed mold. The inner wall of the plate has a simple structure, is easy to manufacture, has good reliability in the pulling and deforming action, and improves the yield rate of plastic products; third, while the pulling and deforming push block moves inward to deform, the inner core-pulling insert also moves inward under the guidance of the inner core-pulling guide rail to escape from the side baffle of the plastic product, preventing the inner core-pulling insert from pressing against the flange of the plastic product, which causes the undercut to be unable to elastically deform inward, ensuring that enough space is left for the pulling and deforming push block to deform inward, so that the undercut position can fully elastically deform inward, and ensuring that it can smoothly escape from the inner wall of the fixed template.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a parting undercut and deformation demoulding mechanism in an injection mold of the utility model;

FIG2 is a partial enlarged schematic diagram of point A in FIG1 ;

FIG3 is a three-dimensional schematic diagram of the cooperation between the tensile deformation device and the baffle removal device and a local plastic product;

FIG4 is a three-dimensional schematic diagram of the cooperation between the tensile deformation device and a local plastic product;

FIG5 is a perspective view of a pulling groove formed in a pulling deformation push block;

FIG. 6 is a schematic diagram of a partially enlarged structure of a conventional automobile bumper injection mold in which the parting surface is arranged at the upper part of the corner.

DETAILED DESCRIPTION

The utility model relates to an injection mold internal parting undercut pulling deformation demoulding mechanism, as shown in Figures 1 to 5, comprising an upper composite plate 1 and a lower composite plate 2, an upper pad plate 3 is arranged under the upper composite plate 1, a fixed mold plate 4 is arranged under the upper pad plate 3, a mold foot 5 is arranged on the lower composite plate 2, an upper ejector plate 6, a lower ejector plate 7, a straight ejector rod 8 and an inclined ejector rod 9 are arranged on the lower composite plate 2 between the mold feet 5, a movable mold plate 10 is arranged on the mold foot 5, a large straight ejector block 11 and a large inclined ejector block 12 are arranged on the movable mold plate 10, the straight ejector rod 8 passes through the movable mold plate 10 to connect the large straight ejector block 11, the inclined ejector rod 9 passes through the movable mold plate 10 to connect the large inclined ejector block 12, and the mold foot 5 is arranged on the lower composite plate 2 between the mold feet 5. A mold cavity is formed between the straight ejector block 11, the large inclined ejector block 12, and the fixed mold plate 4, in which there is an injection-molded plastic product 13, one side of the plastic product 13 is provided with an arc-shaped downward flange 14, one side of the flange 14 is provided with a side baffle 15, an inner parting undercut 16 is provided under the flange 14, a parting line 17 is provided at the bottom of the undercut 16, the undercut 16 and the flange 14 are provided with a corner 18, and the corner 18 is matched with the inner wall of the fixed mold plate 4, the large inclined ejector block 12 is provided with a pulling deformation device at the inner parting undercut 16, the large inclined ejector block 12 is provided with a baffle removal device on the inner wall of the side baffle 15, and the pulling deformation device The large inclined ejector block 12 includes a pull deformation push block 19, a pull groove 20 is formed on the inner side of the pull deformation push block 19 located at the undercut 16, the pull groove 20 is communicated with the mold cavity, a pull handle 21 is injected into the pull groove 20, and the pull handle 21 is integrally connected to the inner wall of the undercut 16, a pull deformation guide rail 22 is provided in the movable template 10, a pull deformation inclined section 23 and a reset inclined section 24 are formed in the pull deformation guide rail 22, a guide block 25 is provided under the large inclined ejector block 12, a guide hole 26 is formed in the guide block 25, a push block guide rod 27 is provided in the guide hole 26, and the push block guide rod 27 is slidably matched with the guide hole 26. One end of the block guide rod 27 is formed with a push block slide 28, and the push block slide 28 cooperates with the tensile deformation guide rail 22. The other end of the push block guide rod 27 is fixedly connected to the tensile deformation push block 19. The de-baffle device includes an inner core-pulling insert 29 arranged above the tensile deformation push block 19 inside the large inclined top block 12. The inner core-pulling insert 29 cooperates with the inner wall of the side baffle 15 and the top of the undercut 16. The inner core-pulling insert 29 is connected to the inner core-pulling guide rod 30, and an inner core-pulling slide 31 is formed on the inner core-pulling guide rod 30. An inner core-pulling guide rail 32 is arranged in the movable template 10, and the inner core-pulling slide 31 cooperates with the inner core-pulling guide rail 32.

Furthermore, the material pulling groove 20 is T-shaped, and the corresponding material pulling handle 21 is T-shaped.

Furthermore, a support rod 33 is provided in the large inclined top block 12, and the support rod 33 is slidably matched with the large inclined top block 12. A groove 34 is formed on one side of the pull-deformation push block 19 located at the support rod 33, and the support rod 33 is slidably connected with the groove 34 of the pull-deformation push block 19. The support rod 33 is provided in the large inclined top block 12, and the support rod 33 can play a certain supporting role on the inner side of the pull-deformation push block 19, ensuring that the pull-deformation push block 19 is more stable and reliable when pulling and deforming inward.

The utility model discloses a parting undercut drawing and deforming demoulding mechanism in an injection mold. After a plastic product 13 is injection molded, the mold is gradually opened from a fixed mold plate 4 and a movable mold plate 10. At the same time, an upper ejector plate 6, a lower ejector plate 7, a straight ejector rod 8, an inclined ejector rod 9, a large straight ejector block 11, a large inclined ejector block 12 and a plastic product 10 are driven by power to move upward together (actually, the upper ejector plate 6, the lower ejector plate 7, the straight ejector rod 8, the large straight ejector block 11 and the plastic product 10 remain stationary relative to the fixed mold plate 4), and a drawing and deforming push block 19 and a push block guide rod 27 are in a push block slide groove 28 and a drawing and deforming guide rail 2 2, and the inner core-pulling insert 29 and the inner core-pulling guide rod 30, under the guidance of the inner core-pulling chute 31 and the inner core-pulling guide rail 32, first make a linear motion upward, that is, the deformation push block 19, the inner core-pulling insert 29, and the plastic product 10 move upward together, and the three remain stationary, while the large inclined ejector block 12 moves inward along the inclined direction of the inclined rod 9 of the inclined ejector rod while moving upward, so that the large inclined ejector block 12 first escapes from the inner wall of the flange 14 of the plastic product 10, and leaves a certain space for the movement of the deformation push block 19 and the inner core-pulling insert 29, when the push block chute 28 moves upward with the pull block, the inner core-pulling insert 29 moves upward, and the inner core-pulling guide rod 32 moves upward. When the deformation inclined section 23 cooperates, under the guiding action of the pull deformation inclined section 23, the push block guide rod 27 and the pull deformation push block 19 are driven to move inward, and the pull deformation push block 19 drives the pulling handle 21 in the pulling groove 20 to move inward, and the pulling handle 21 pulls the undercut 16 at the bottom of the plastic product 13 to elastically deform inward. Since the plastic material has a certain elastic force, the undercut 16 is disengaged from the inner wall of the fixed template 4 inward, completing the pull deformation demoulding of the undercut 16 on one side of the fixed template 4, and the two push block slide grooves 28 continue to cooperate with the reset inclined section 24 upward, and the push block guide rod 27 drives the pulling handle 21 and the undercut 16 to restore The inner core-pulling guide rail 32 is also provided with a corresponding inclined section and a reset section. When the inner core-pulling guide rod 30 cooperates with the inclined section of the inner core-pulling guide rail 32, the inner core-pulling insert 29 is driven to disengage from the side baffle 15 inwardly, and the inner core-pulling time of the inner core-pulling insert 29 is synchronized with the time of the pulling and deforming push block 19 to pull and deform inwardly. In this way, space can be left for the pulling and deforming push block 19 to pull and deform inwardly, so that the undercut 16 position can be fully elastically deformed inwardly, ensuring that it can smoothly disengage from the inner wall of the fixed mold plate 4, and finally the straight ejector rod 8 and the large straight ejector block 11 will eject the plastic product 10 that has completed the core-pulling. The present invention provides an internal parting undercut and pulling and deforming demoulding mechanism for the injection mold. First, the undercut 16 of the plastic product 10 adopts an internal parting structure to ensure its beautiful appearance. Second, a pulling groove 20 is formed in the pulling and deforming push block 19, and the pulling groove 20 is communicated with the mold cavity. During injection molding, the rubber material flows into the mold cavity to form the plastic product 10, and at the same time, the rubber material also flows into the pulling groove 20 to form a pulling handle 21. When the mold is opened, the pulling and deforming guide rail 22 cooperates with the guide block 25 to drive the pulling and deforming push block 19 and the pulling handle 21 to move inward, so that the undercut 16 of the plastic product 10 can be smoothly ejected from the fixed mold plate 4. The inner wall has a simple structure and is easy to manufacture. The reliability of the pulling and deforming action is good, which improves the yield rate of the plastic product 10. Third, while the pulling and deforming push block 19 moves inward to deform, the inner core-pulling insert 29 also moves inward under the guidance of the inner core-pulling guide rail 32 to disengage from the side baffle 15 of the plastic product 10, preventing the inner core-pulling insert 29 from supporting the flange 14 of the plastic product 10, thereby causing the undercut 16 to be unable to elastically deform inward, ensuring that enough space is left for the pulling and deforming push block 19 to deform inward, so that the position of the undercut 16 can be fully elastically deformed inward, ensuring that it can smoothly disengage from the inner wall of the fixed template 4.

Claims (3)

1. The injection mold inner parting and back-off deformation demoulding mechanism comprises an upper compound plate (1) and a lower compound plate (2), wherein an upper base plate (3) is arranged below the upper compound plate (1), a fixed die plate (4) is arranged below the upper base plate (3), a die foot (5) is arranged on the lower compound plate (2) between the die feet (5), an upper ejector plate (6), a lower ejector plate (7), a straight ejector rod (8) and an inclined ejector rod (9) are arranged on the lower compound plate (2), a movable die plate (10) is arranged on the die foot (5), a large straight ejector block (11) and a large inclined ejector block (12) are arranged on the movable die plate (10), the straight ejector rod (8) penetrates through the movable die plate (10) to be connected with the large straight ejector block (11), a die cavity is formed between the large straight ejector block (11), the large inclined ejector block (12) and the fixed die plate (4), a plastic product (13) is arranged in the die cavity, one side of the plastic product (13) is provided with an arc-shaped flanging (14), one side (14) of the plastic product (13) is provided with a downward flanging, one side (14) is provided with a baffle plate (16) and the bottom (16) is provided with a flanging (16) in a reverse-shaped manner, the bottom (16) is provided with a flanging (16), the corner (18) is matched with the inner wall of the fixed template (4), the large inclined jacking block (12) is positioned at the inner parting inverted buckle (16) and provided with a pulling deformation device, and the inner wall of the large inclined jacking block (12) positioned at the side baffle (15) is provided with a baffle removing device, which is characterized in that: the pulling deformation device comprises a pulling deformation pushing block (19) arranged in a large inclined pushing block (12), a pulling trough (20) arranged on the inner side of a back-off (16) and communicated with a die cavity, a pulling handle (21) arranged in the pulling trough (20) in an injection molding way, a pulling handle (21) integrally connected with the inner wall of the back-off (16), a pulling deformation guide rail (22) arranged in a movable template (10), a pulling deformation inclined section (23) and a resetting inclined section (24) arranged in the pulling deformation guide rail (22), a guide block (25) arranged below the large inclined pushing block (12), a guide hole (26) arranged in the guide block (25), a pushing block guide rod (27) arranged in the guide hole (26), a pushing block guide rod (27) in sliding fit with the guide hole (26), a pushing block guide groove (28) arranged at one end of the pushing block guide rod (27), a core pulling block (28) and the inner wall of the back-off deformation guide rail (22) integrally connected, the other end of the pushing block guide rod (27) and the pulling deformation pushing block (19) fixedly connected with the large inclined pushing block (12) and the inner wall of the back-off (29) arranged on the back-off block (16), the inner core-pulling insert (29) is connected with an inner core-pulling guide rod (30), an inner core-pulling sliding groove (31) is formed in the inner core-pulling guide rod (30), an inner core-pulling guide rail (32) is arranged in the movable template (10), and the inner core-pulling sliding groove (31) is matched with the inner core-pulling guide rail (32).

2. The injection mold internal parting back-off pull deformation demolding mechanism as claimed in claim 1, wherein: the material pulling groove (20) is T-shaped, and the corresponding material pulling handle (21) is T-shaped.

3. The injection mold internal parting back-off pull deformation demolding mechanism as claimed in claim 1, wherein: the large inclined jacking block (12) is internally provided with a handrail (33), the handrail (33) is in sliding fit with the large inclined jacking block (12), a pull groove (34) is formed in one side of the pulling deformation pushing block (19) located on the handrail (33), and the handrail (33) is in sliding connection with the pull groove (34) of the pulling deformation pushing block (19).