Internal drawing type injection mold

Abstract

The utility model relates to an inner pulling type injection mold which comprises an upper mold base and a lower mold base which correspond to each other, an inclined bolt arranged in the upper mold base, and an auxiliary mold core, a side pulling block, a limiting plate, a demolding plate and an ejector rod which are arranged in the lower mold base, according to the structure characteristics of the bending part of the plastic part, the orientation of the side pulling block is inclined to the lower mold core, so that one side pulling block can simultaneously generate side grooves in multiple directions on the plastic part, independent side pulling blocks do not need to be arranged on the side groove surfaces in different directions, the number of the movable side pulling blocks is reduced, and the production efficiency is improved. Fault points of the die are reduced, the stability of the die structure is kept, and the maintenance cost of the die is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of mold design, and in particular to an internal extraction injection mold. Background Technology

[0002] When designing injection molds for plastic parts with side grooves, side puller structures are often used. During mold closing, the side puller is close to the mold cavity and participates in the molding of the plastic part. During mold opening, the side puller moves away from the mold cavity so as not to affect the demolding action of the plastic part. However, with the upgrading of product structures, the structure of plastic parts has also become more complex. When dealing with side groove structures with multiple orientations, corresponding side pullers are often set in each direction to meet the structural design requirements of the plastic part. However, such mold structures also result in more accessories on the mold, and the number of potential failure points of the mold increases accordingly, which seriously affects the stability of the mold structure and increases the mold maintenance cost. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, the technical solution adopted by this utility model is as follows: an internal extraction injection mold, including a corresponding upper mold base and a lower mold base, an inclined pin disposed in the upper mold base, and a sub-mold core, a side extraction block, a limiting plate, a ejector plate, and an ejector rod disposed in the lower mold base. The upper mold base is provided with an injection port and a mold cavity disposed on one side of the injection port. The lower mold base is provided with a lower mold core corresponding to the mold cavity. The sub-mold core and the side extraction block are disposed at two opposite corners of the lower mold core. The side extraction block is slidably connected to the lower mold base through the limiting plate. The lower mold base is connected to an ejector plate, and the ejector plate is connected to an ejector rod extending to the lower mold core. The lower mold core is provided with a bent portion that combines with the side extraction block to form the side edge of the plastic part. The side extraction block is provided with a protrusion corresponding to the bent portion. The upper mold base is provided with an inclined pin for controlling the movement of the side extraction block, and the side extraction block is inclined towards the bent portion of the lower mold core.

[0004] Using the above technical solution, when the upper mold base and the lower mold base are closing or opening, the side pull block is controlled to move closer to or further away from the lower mold core by the inclined pin. According to the structural characteristics of the bending part of the plastic part, the orientation of the side pull block is tilted towards the lower mold core, so that one side pull block can generate side grooves in multiple directions on the plastic part at the same time. There is no need to set independent side pull blocks for side grooves in different directions, thereby reducing the number of active side pull blocks, reducing the failure points of the mold, and improving the stability of the mold structure.

[0005] The present invention is further configured such that the upper mold base is provided with a first mounting groove and a second mounting groove on both sides of the lower mold core for installing the sub-mold core and the side pull block, respectively. The first mounting groove is provided with a countersunk hole for installing the sub-mold core, and the two sides of the second mounting groove are provided with threaded holes for installing the limiting plate. The side pull block is slidably connected to the second mounting groove through the limiting plate.

[0006] Furthermore, the sub-mold core is L-shaped as a whole, and one end of the sub-mold core is provided with an arc surface. The upper mold base is provided with a shaping part that combines with the arc surface to form the rounded corner surface of the plastic part.

[0007] Furthermore, the side pull block is provided with an oblique hole and a locking part, the oblique pin is connected to the oblique hole, and the side pull block is slidably connected between two sets of limiting plates through the locking part.

[0008] Furthermore, the second mounting groove is provided with a stepped portion, the side pull block is provided with a connecting portion that abuts against the stepped portion, the protrusion is provided on the end face of the connecting portion, and the outer contour of the end face of the connecting portion corresponds to the bent portion, and the two ends of the protrusion are provided with notches for feeding.

[0009] By adopting the above technical solution, the limiting plate restricts the side pull block to move only along the second mounting groove. During the injection, the material forms a loop through the notches at both ends of the side pull block, so that the internal gas can be discharged normally when the material fills the bottom of the protrusion, thus avoiding surface defects in the plastic parts.

[0010] The present invention is further configured such that the limiting plate has a venting groove on the side facing the side drawer.

[0011] By adopting the above technical solution, when the upper mold base and the lower mold core are normally closed, the air pressure at both ends of the side pull block is balanced by the vent groove, which avoids the instantaneous increase of air pressure between the side pull block and the lower mold core, thereby reducing the wear of the side pull block and the inclined pin and improving the service life of the mold.

[0012] The present invention is further configured such that the upper mold base is provided with a pressure block on one side of the inclined pin, and the side pull block is provided with an inclined surface that abuts against the pressure block.

[0013] Furthermore, the injection port is located directly above the side pull block, and the upper mold base and the side pull block are combined to form a flow channel, and a tapered groove is provided between the flow channel and the mold cavity.

[0014] Using the above technical solution, the pressure block presses the side pull block tightly with the inclined surface, so that the side pull block always abuts against the lower mold core during high-pressure injection. During injection, the material enters through the injection port and increases the fluidity of the plastic through the conical groove.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] Based on the structural characteristics of the bending part of the plastic part, the side pull block is tilted towards the lower mold core, so that one side pull block can generate side grooves in multiple directions on the plastic part at the same time. There is no need to set independent side pull blocks on the side groove surfaces in different directions, thereby reducing the number of active side pull blocks, reducing the failure points of the mold, maintaining the stability of the mold structure, and reducing the maintenance cost of the mold.

[0017] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present utility model;

[0019] Figure 2 This is a front view of the upper mold base of this utility model;

[0020] Figure 3 This is a front view of the lower mold base of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the lower mold base for removing the sub-mold core, side pull block and limiting plate of this utility model;

[0022] Figure 5 This is a perspective view of the side drawer block of this utility model;

[0023] Figure 6 This is a perspective view of the limiting plate of this utility model;

[0024] Figure 7 For the present utility model Figure 2 A magnified view of a section at point A in the middle;

[0025] Figure 8 This is a perspective view of the plastic part of this utility model;

[0026] Wherein: 1-Upper mold base, 2-Lower mold base, 3-Angled pin, 4-Secondary mold core, 5-Side pull block, 6-Limiting plate, 7-Removal plate, 8-Ejector rod, 11-Injection port, 12-Mold cavity, 13-Shaping part, 14-Pressure block, 15-Angled surface, 16-Runner, 17-Conical groove, 21-Lower mold core, 22-Bending part, 23-First mounting groove, 24-Second mounting groove, 25-Counterhead hole, 26-Threaded hole, 27-Step part, 41-Arc surface, 51-Protrusion, 52-Angled hole, 53-Snap-fit ​​part, 54-Connecting part, 61-Air groove, 9-Plastic part, 91-Side edge, 92-Side groove; Detailed Implementation

[0027] Combination Figure 1-3As shown, this utility model provides an internally withdrawable injection mold, including a corresponding upper mold base 1 and a lower mold base 2, an inclined pin 3 disposed in the upper mold base 1, and a secondary mold core 4, a side pull block 5, a limiting plate 6, a ejector plate 7, and an ejector pin 8 disposed in the lower mold base 2. The upper mold base 1 is provided with an injection port 11 and a mold cavity 12 disposed on one side of the injection port 11. The lower mold base 2 is provided with a lower mold core 21 corresponding to the mold cavity 12. The secondary mold core 4 and the side pull block 5 are disposed on two sides of the lower mold core 21. At the diagonal, the side pull block 5 is slidably connected to the lower mold base 2 via the limiting plate 6. The lower mold base 2 is connected to the ejector plate 7, and the ejector plate 7 is connected to the ejector rod 8 extending to the lower mold core 21. The lower mold core 21 is provided with a bent portion 22 that combines with the side pull block 5 to form the side edge of the plastic part. The side pull block 5 is provided with a protrusion 51 corresponding to the bent portion 22. The upper mold base 1 is provided with a slanted pin 3 for controlling the movement of the side pull block 5, and the side pull block 5 is inclined toward the bend of the bent portion 22 toward the lower mold core 21.

[0028] Combination Figure 4 As shown, in this embodiment, the upper mold base 1 is provided with a first mounting groove 23 and a second mounting groove 24 on both sides of the lower mold core 21 for mounting the sub-mold core 4 and the side pull block 5. The first mounting groove 23 is provided with a countersunk hole 25 for mounting the sub-mold core 4. The two sides of the second mounting groove 24 are provided with threaded holes 26 for mounting the limiting plate 6. The side pull block 5 is slidably connected to the second mounting groove 24 through the limiting plate 6. The sub-mold core 4 is L-shaped in general, and one end of the sub-mold core 4 is provided with an arc surface 41. The upper mold base 1 is provided with a shaping part 13 that combines with the arc surface 41 to form the rounded corner surface of the plastic part.

[0029] Combination Figure 5 , 6 As shown, in this embodiment, the side drawer block 5 is provided with an oblique hole 52 and a snap-fit ​​part 53. The oblique pin 3 is connected to the oblique hole 52. The side drawer block 5 is slidably connected between the two sets of limiting plates 6 through the snap-fit ​​part 53. The second mounting groove 24 is provided with a stepped part 27. The side drawer block 5 is provided with a connecting part 54 that abuts against the stepped part 27. The protrusion 51 is provided on the end face of the connecting part 54, and the outer contour of the end face of the connecting part 54 corresponds to the bending part 22. The two ends of the protrusion 51 are provided with notches 55 for feeding. The limiting plate 6 is provided with a ventilation groove 61 on the side facing the side drawer block 5.

[0030] Combination Figure 7 As shown, in this embodiment, the upper mold base 1 is provided with a pressure block 14 on one side of the inclined pin 3, the side pull block 5 is provided with an inclined surface 15 that abuts against the pressure block 14, the injection port 11 is provided directly above the side pull block 5, and the upper surface of the upper mold base 1 and the side pull block 5 are combined to form a flow channel 16, and a conical groove 17 is provided between the flow channel 16 and the mold cavity 12. The pressure block 14 presses the side pull block 5 tightly through the inclined surface 15, so that the side pull block 5 always abuts against the lower mold core 21 during high-pressure injection. During injection, the material enters through the injection port 11 and increases the fluidity of the plastic through the conical groove 17.

[0031] Combination Figure 8 As shown, the working principle of this utility model is as follows: when the upper mold base 1 and the lower mold base 2 are closed, the side pull block 5 is controlled to approach the lower mold core 21 by the inclined pin 3, so that the protrusion 51 abuts against the lower mold core 21. The sub-mold core 4 and the side pull block 5 partially surround the lower mold core 21, and the side edge 91 of the plastic part 9 is formed by the bending part 22. The side groove 92 of the plastic part 9 is formed by the protrusion 51. High pressure material enters through the injection port 11 and flows into the mold cavity 12 through the flow channel 16. The plastic part 9 is formed by cooling. When the upper mold base 1 and the lower mold base 2 are opened, the side pull block 5 is controlled to move away from the lower mold core 21 by the inclined pin 3 to prevent the protrusion 51 from interfering with the normal demolding of the plastic part 9. The ejector pin 8 is controlled to move towards the direction of the plastic part 9 by the ejector plate 7, so that the plastic part 9 can be demolded normally.

[0032] In addition to the embodiments described above, this utility model may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by this utility model.

Claims

1. An internally withdrawable injection mold, characterized in that, It includes a corresponding upper mold base (1) and lower mold base (2), a slanted pin (3) in the upper mold base (1), and a secondary mold core (4), side pull block (5), a limiting plate (6), a stripping plate (7), and an ejector pin (8) in the lower mold base (2). The upper mold base (1) is provided with a sprue (11) and a mold cavity (12) on one side of the sprue (11). The lower mold base (2) is provided with a lower mold core (21) corresponding to the mold cavity (12). The secondary mold core (4) and the side pull block (5) are located at two opposite corners of the lower mold core (21). The lower mold base (2) is slidably connected to the limiting plate (6). The lower mold base (2) is connected to the ejector plate (7), and the ejector plate (7) is connected to the ejector rod (8) extending to the lower mold core (21). The lower mold core (21) is provided with a bent part (22) that is combined with the side pull block (5) to form the side edge of the plastic part. The side pull block (5) is provided with a protrusion (51) corresponding to the bent part (22). The upper mold base (1) is provided with a slanted pin (3) for controlling the movement of the side pull block (5), and the side pull block (5) is inclined toward the bend of the bent part (22) toward the lower mold core (21).

2. The internal extraction injection mold according to claim 1, characterized in that: The upper mold base (1) is provided with a first mounting groove (23) and a second mounting groove (24) on both sides of the lower mold core (21) for installing the sub-mold core (4) and the side pull block (5). The first mounting groove (23) is provided with a countersunk hole (25) for installing the sub-mold core (4). The second mounting groove (24) is provided with threaded holes (26) on both sides for installing the limiting plate (6). The side pull block (5) is slidably connected to the second mounting groove (24) through the limiting plate (6).

3. The internal extraction injection mold according to claim 2, characterized in that: The sub-mold core (4) is L-shaped in general, and one end of the sub-mold core (4) is provided with an arc surface (41). The upper mold base (1) is provided with a shaping part (13) that combines with the arc surface (41) to form the rounded corner surface of the plastic part.

4. The internal extraction injection mold according to claim 2, characterized in that: The side pull block (5) is provided with an oblique hole (52) and a snap-fit ​​part (53). The oblique pin (3) is connected to the oblique hole (52), and the side pull block (5) is slidably connected between the two sets of limiting plates (6) through the snap-fit ​​part (53).

5. The internal extraction injection mold according to claim 4, characterized in that: The second mounting groove (24) is provided with a stepped portion (27), the side draw block (5) is provided with a connecting portion (54) that abuts against the stepped portion (27), the protrusion (51) is provided on the end face of the connecting portion (54), and the outer contour of the end face of the connecting portion (54) corresponds to the bent portion (22). The two ends of the protrusion (51) are provided with notches (55) for feeding.

6. The internal extraction injection mold according to claim 5, characterized in that: The limiting plate (6) has a ventilation groove (61) on the side facing the side drawer (5).

7. The internal extraction injection mold according to claim 1, characterized in that: The upper mold base (1) is provided with a pressure block (14) on one side of the inclined pin (3), and the side pull block (5) is provided with an inclined surface (15) that abuts against the pressure block (14).

8. The internal extraction injection mold according to claim 7, characterized in that: The injection port (11) is located directly above the side draw block (5), and the upper mold base (1) and the side draw block (5) are combined to form a flow channel (16), and a tapered groove (17) is provided between the flow channel (16) and the mold cavity (12).

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