Automobile headlamp trim ring injection mold

Abstract

The application discloses a kind of automobile headlamp decorative ring injection mould, including fixed mould, movable mould and ejection mechanism, the side of the fixed mould towards movable mould is elastically connected with elastic block, the inlet gate is arranged on the elastic block, flow channel that the fixed mould is provided with and inlet gate intercommunication, the detachable connection of guide pipe is detachably connected with the inlet gate at the elastic block, the end of guide pipe is communicated with flow channel when the elastic block is in the state of springing up, by the setting of guide pipe, after the elastic block is sprung up from the fixed mould when injection mould opens, guide pipe still can keep the connection of flow channel port and inlet gate by means of, so that when the cold material and sundry in flow channel are discharged when injection mould is initially opened and used, these cold material and sundry are guided to inlet gate by guide pipe and discharged, effectively prevent the cold material and sundry from falling into the gap between elastic block and fixed mould during discharge, avoid subsequent cleaning for cold material and sundry, and also can avoid the risk of mould damage caused by forcibly closing mould due to the existence of cold material and sundry.

Description

Technical Field

[0001] This invention relates to the field of molds, and in particular to an injection mold for automotive front light bezels. Background Technology

[0002] Automotive injection molds are molds specifically used to produce automotive injection molded parts. They belong to a subcategory of injection molds with high technical requirements and high structural complexity. Automotive headlight trim rings are decorative and protective components in automotive headlight assemblies. With the continuous development of the automotive industry, the shape and structure of automotive headlight trim rings have gradually become more complex and diversified. Some automotive headlight trim rings have undercuts on their surface. For such products, a spring block needs to be set on the injection mold during injection molding. The spring block has a protrusion corresponding to the undercut structure. After the mold opens, the spring block will bounce up under the combined drive of a spring and a slanted guide post. During the bounce, the protrusion on the spring block will disengage from the undercut of the injection molded product, ensuring that the subsequent injection molded product can be successfully demolded.

[0003] In actual injection molding, the sprue position of the cavity may be located on the spring block. When the mold is closed, the molten plastic injected can enter the cavity through the sprue at the sprue position. However, after the mold is opened, the spring block will be in a spring-loaded state. At this time, there will be a separation between the sprue on the spring block and the runner on the fixed mold. At this time, there is a gap between the spring block and the fixed mold. When the injection mold is used for the first time, it is usually necessary to remove the cold material and debris remaining in the sprue runner. Due to the existence of this gap, cold material and debris may accidentally fall into the gap between the spring block and the fixed mold during the material removal process. This not only requires the mold to be disassembled when cleaning the cold material and debris, but also causes mold damage if the mold is forcibly closed when the cold material and debris are located between the spring block and the fixed mold. Further improvement and perfection are needed. Summary of the Invention

[0004] To further improve the initial material routing effect and reduce mold damage, this application provides an injection mold for automotive front light trim rings.

[0005] This application provides an injection mold for automotive front light trim rings, employing the following technical solution:

[0006] An injection mold for automotive front light bead ring includes a fixed mold, a moving mold, and an ejection mechanism. A spring block is elastically connected to the side of the fixed mold facing the moving mold. A sprue is provided on the spring block. A runner is provided on the fixed mold that communicates with the sprue. A guide tube is detachably connected to the spring block at the sprue position. When the spring block is in the popped-up state, one end of the guide tube communicates with the runner.

[0007] Optionally, the inner diameter of the end of the guide tube is larger than the diameter of the end opening of the flow channel.

[0008] Optionally, the spring block is provided with mounting holes for installing the guide tube, and the guide tube is connected and fixed to the spring block by screws.

[0009] Optionally, the end of the guide tube away from the spring block is inserted into the flow channel. When the spring block is in the popped-up state, the end of the guide tube is located in the flow channel, and the end face of the guide tube facing away from the fixed mold is flush with the end face of the spring block.

[0010] Optionally, the end of the guide tube inserted into the flow channel has a convex ring, and the outer wall of the convex ring abuts against the inner wall of the flow channel.

[0011] Optionally, the sidewall of the guide tube is provided with a through hole that extends laterally. Multiple through holes are evenly distributed around the circumference. When the spring block is in the non-exploded state, the through holes are located inside the flow channel.

[0012] Optionally, the end of the guide tube away from the flow channel has a mounting part, the outer diameter of the mounting part is larger than the outer diameter of the guide tube, a retaining ring is slidably connected to the mounting part, and a first spring is provided on the mounting part to drive the retaining ring to block and close the through hole. When the spring block is in the pop-out state, the retaining ring closes the through hole.

[0013] Optionally, the end opening diameter of the flow channel is adapted to the guide pipe, the outer diameter of the retaining ring is larger than the end opening diameter of the flow channel, and the mounting part is provided with a sliding groove for the retaining ring to slide inward. When the mold is closed, the retaining ring is compressed into the sliding groove and the retaining ring and the through hole are misaligned.

[0014] Optionally, a limiting block is elastically connected to the inner wall of the retaining ring at the through hole. The limiting block has a locking part that engages with the through hole. The locking part is hemispherical. A second spring is provided on the inner wall of the retaining ring to drive the limiting block into the through hole.

[0015] Optionally, the fixed mold is provided with an inclined outward guide bar, the spring block is provided with a guide groove that cooperates with the guide bar, and the fixed mold is provided with a return spring that drives the spring block to pop out.

[0016] In summary, this application includes at least one of the following beneficial technical effects:

[0017] 1. By setting up the guide tube, after the spring block bounces off the fixed mold when the injection mold opens, the connection between the runner port and the gate can still be maintained with the help of the guide tube. In this way, when the injection mold is opened for the first time to discharge cold material and debris in the runner, these cold material and debris are guided to the gate through the guide tube for discharge. This effectively prevents cold material and debris from falling into the gap between the spring block and the fixed mold during discharge, avoiding the need to clean the cold material and debris that fell into the gap later. At the same time, it also avoids the risk of mold damage caused by forcibly closing the mold due to the presence of cold material and debris.

[0018] 2. The end face of the guide tube is flush with the end face of the spring block and the guide tube can be inserted into the flow channel. This ensures that there will be no interference with the guide tube during the mold closing process, and that the mold closing can proceed normally without disassembling the guide tube. The guide tube can play a good guiding role whether the mold is open or closed.

[0019] 3. The through hole design guides the injection material flowing to the end face of the runner to the guide tube and finally discharges it, reducing the accumulation of injection material at the end face of the runner. At the same time, when the injection mold opens, the retaining ring automatically closes the through hole during the outward movement of the guide tube, preventing some material from being discharged from the through hole during the discharge process. The through hole is automatically opened and closed during the mold closing process, which can be achieved without extra operation, making it simple and convenient. Attached Figure Description

[0020] Figure 1 This is an overall structural diagram of Example 1.

[0021] Figure 2 This is a perspective view of the fixed mold in Example 1 when the spring block on one side is in the pop-up state.

[0022] Figure 3 This is a front view of the fixed mold in Example 1.

[0023] Figure 4 yes Figure 3 Sectional view at point AA.

[0024] Figure 5 This is a partial cross-sectional view of the fixed mold corresponding to the spring block in Embodiment 2.

[0025] Figure 6 yes Figure 5 Enlarged view of point B in the middle.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Fixed mold; 2. Moving mold; 3. Inlet; 4. Cavity; 5. Runner; 6. Top plate; 7. Hydraulic cylinder; 8. Spring block; 9. Protrusion; 10. Guide bar; 11. Guide groove; 12. Return spring; 13. Sprue; 14. Mating groove; 15. Guide tube; 16. Mounting hole; 17. Gap; 18. Mounting part; 19. Mounting groove; 20. convex ring; 21. Cavity; 22. Through hole; 23. Retaining ring; 24. First spring; 25. Slide groove; 26. Limiting block; 27. Receiving groove; 28. Second spring; 29. ​​Snap-fit ​​part. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0029] Example 1: An injection mold for automotive front light bezels, such as... Figures 1-3 As shown, the mold includes a fixed mold 1, a moving mold 2, and an ejection mechanism. The fixed mold 1 has an injection port 3 on one side for injecting raw material. There is a cavity 4 between the fixed mold 1 and the moving mold 2 for molding the product. The fixed mold 1 is provided with a flow channel 5 that connects the injection port 3 and the cavity 4. The ejection mechanism includes an ejector plate 6 and a hydraulic cylinder 7. Multiple ejector rods are provided on the ejector plate 6. After the fixed mold 1 and the moving mold 2 are closed, raw material is injected from the injection port 3. The raw material flows into the cavity 4 to form the product. After the product is formed, the mold is opened. The hydraulic cylinder 7 drives the ejector plate 6 to move and ejects the product that has been formed on the cavity 4 with the help of the ejector rods.

[0030] like Figures 2-4 As shown, since the molded product has an undercut, a spring block 8 is elastically connected to the fixed mold 1. One side of the spring block 8 has a protrusion 9 for inserting into the undercut of the molded product. An inclined outward guide bar 10 is fixedly provided on the fixed mold 1. A guide groove 11 is provided on the spring block 8 to slide with the guide bar 10. A return spring 12 is provided on the fixed mold 1 to drive the spring block 8 out of the fixed mold 1. In this way, when the mold opens, the fixed mold 1 and the moving mold 2 separate, and the spring block 8 will automatically pop out under the elastic force of the return spring 12. During the pop-out process, the spring block 8 moves inclined outward along the direction of the guide bar 10. The outward movement of the spring block 8 causes the protrusion 9 to disengage from the undercut of the molded product, ensuring that the subsequently molded product can be well ejected to achieve demolding.

[0031] like Figures 2-4 As shown, a sprue 13 is provided on the spring block 8, and the sprue 13 is vertically provided through the spring block 8. The fixed mold 1 has a mating groove 14 that mates with the spring block 8, and a runner 5 is provided on the fixed mold 1 at the sprue 13 corresponding to the spring block 8. After the mold is closed, the spring block 8 moves down and mates in the mating groove 14. At this time, the opening at the end of the runner 5 overlaps and connects with the sprue 13, so that the injection material in the runner 5 is injected into the cavity 4 through the sprue 13.

[0032] like Figures 2-4 As shown, a guide tube 15 is detachably connected to the spring block 8 at the corresponding inlet 13. Corresponding mounting holes 16 are provided on the guide tube 15 and the spring block 8. The guide tube 15 is fixed to the spring block 8 by installing screws in the mounting holes 16. When the mold is opened and the spring block 8 is in the open state, one end of the guide tube 15 abuts against the opening of the corresponding runner 5 in the fixed mold 1, allowing communication between the runner 5 and the guide tube 15. In this embodiment, the inner diameter of the end of the guide tube 15 is larger than the opening diameter of the runner 5, ensuring that the raw material flowing out of the runner 5 can be well discharged through the guide tube 15. Figure 4 In the middle, one side of the spring block 8 is in the popped-up state, while the other side of the spring block 8 is in the non-popped-up state.

[0033] When the injection mold opens, the spring block 8 pops up from the fixed mold 1. After the spring block 8 pops up, there will be a gap between it and the fixed mold 1, forming a gap 17. By installing the guide tube 15 on the spring block 8, the connection between the runner 5 port and the gate 13 can still be maintained. In this way, when the injection mold is opened for the first time to discharge the cold material and debris in the runner 5, these cold materials and debris are guided to the gate 13 through the guide tube 15 for discharge. This effectively prevents the cold material and debris from falling into the gap 17 between the spring block 8 and the fixed mold 1 during discharge, avoiding the need to clean the cold material and debris that fell into the gap 17 later. It also avoids the risk of mold damage caused by forcibly closing the mold due to the presence of cold material and debris. After the cold material or debris is discharged for the first time, the guide tube 15 is removed, and the mold can be closed normally for injection molding.

[0034] Example 2, an injection mold for automotive front light bezels, such as Figure 5 and Figure 6 As shown, the main difference between this embodiment and Embodiment 1 lies in the structure of the guide tube 15. In this embodiment, the top end of the guide tube 15 has a mounting part 18, the outer diameter of which is larger than the outer diameter of the guide tube 15. The mounting part 18 is integrally formed with the guide tube 15. The spring block 8 has a mounting groove 19 that is adapted to the mounting part 18. After the mounting part 18 and the mounting groove 19 are adapted, the top wall of the mounting part 18 is flush with the top wall of the spring block 8. The end of the guide tube 15 away from the mounting part 18 is inserted into the flow channel 5. During the lifting and lowering of the spring block 8, the end of the guide tube 15 slides in the flow channel 5. In actual installation, the mounting part 18 can be fixed with screws or with a snap ring. The guide tube 15 is long enough that when the spring block 8 is in the pop-out state, the end of the guide tube 15 is still located in the runner 5. This allows the guide tube 15 to be connected to the runner 5. When the mold is used for the first time to discharge cold material, the cold material in the runner 5 can be guided to the gate 13 through the guide tube 15 for discharge, effectively preventing the cold material from falling into the gap 17 between the spring block 8 and the fixed mold 1 during discharge. Moreover, when the mold is closed, there is no need to disassemble the guide tube 15. When the mold is closed, the guide tube 15 moves down and is inserted into the runner 5, which can still achieve the conduction of the injection material. The injection material in the runner 5 finally enters the cavity 4 through the gate 13 to achieve molding.

[0035] In this embodiment, the end face of the guide tube 15 is flush with the end face of the spring block 8 and the guide tube 15 can be inserted into the flow channel 5. This ensures that there will be no interference with the guide tube 15 during the mold closing process. There is no need to disassemble the guide tube 15. The guide tube 15 can play a good guiding role whether the mold is open or closed.

[0036] like Figure 5As shown, a convex ring 20 is fixed at the end of the guide tube 15 inserted into the flow channel 5. The convex ring 20 abuts against the inner wall of the flow channel 5. With the help of the convex ring 20, the end of the guide tube 15 can be well supported radially, and the sliding of the guide tube 15 can be guided, improving the stability of the movement of the guide tube 15. Furthermore, under the obstruction of the convex ring 20, most of the injection molding material flows through the inside of the guide tube 15 to the gate 13.

[0037] like Figure 5 and Figure 6 As shown, a cavity 21 is formed between the convex ring 20 and the end face of the flow channel 5. A radially penetrating through hole 22 is provided on the side wall of the top of the guide tube 15 near the mounting part 18. The through holes 22 are symmetrically distributed. When the mold is in the closed state, after the spring block 8 moves down and engages with the mating groove 14, the through holes 22 on the guide tube 15 are located inside the flow channel 5 and near its end. This design allows the injection material in the cavity 21 to be guided into the guide tube 15 through the gap between the convex ring 20 and the inner wall of the flow channel 5 if some material accidentally enters the cavity 21 through the gap between the convex ring 20 and the inner wall of the flow channel 5. This ensures that the material in the flow channel 5 can enter the guide tube 15 more completely. Furthermore, during the lifting process of the spring block 8, the convex ring 20 also acts as a piston. As the spring block 8 pops out, the space of the chamber 21 gradually shrinks and the internal pressure increases. The material in the chamber 21 can be discharged through the gap between the convex ring 20 and the inner wall of the flow channel 5. After the spring block 8 is fully ejected, the convex ring 20 abuts against the inner wall of the end face of the flow channel 5, realizing the complete discharge of the material in the chamber 21. During this process, the material in the chamber 21 can also play a certain role in buffering and decelerating the ejection. The convex ring 20 can also limit the stroke of the spring block 8 and the guide tube 15, preventing the spring block 8 from being ejected excessively, thus realizing the multi-purpose function of the convex ring 20. In this embodiment, the flow channel 5 and the guide tube 15 are both inclined and the inclination direction is consistent with the ejection direction of the spring block 8. In this way, the inclination of the guide tube 15 can also help the material flow and discharge in the flow channel 5 to a certain extent.

[0038] like Figure 5 and Figure 6 As shown, a retaining ring 23 is slidably connected to the mounting part 18. The sliding direction of the retaining ring 23 is along the length direction of the guide tube 15. A first spring 24 is provided on the mounting part 18 to drive the retaining ring 23 to move and block and close the through hole 22. When the spring block 8 is in the pop-out state, the first spring 24 drives the retaining ring 23 to move down and close the through hole 22. This effectively prevents some cold material or impurities from leaking out through the through hole 22 during the mold opening and discharge of cold material, ensuring that the cold material and impurities in the guide tube 15 are finally discharged well through the inlet 13 at the end of the guide tube 15; thus realizing the automatic closure of the through hole 22 without manual operation.

[0039] like Figure 5 and Figure 6As shown, the mounting part 18 has a sliding groove 25 for the retaining ring 23 to slide and retract. The first spring 24 is set in the sliding groove 25 to drive the retaining ring 23 to move outward and reset. The opening diameter of the end of the flow channel 5 is adapted to the outer diameter of the guide tube 15. The outer diameter of the retaining ring 23 is larger than the opening diameter of the end of the flow channel 5. Thus, during the mold closing, when the spring block 8 is pressed down and cooperates with the mating groove 14, the retaining ring 23 is pressed when it abuts against the fixed mold 1. The retaining ring 23 gradually compresses the first spring 24 and retracts into the sliding groove 25. The retaining ring 23 and the through hole 22 are in a staggered state. After the mold is fully closed, the retaining ring 23 is retracted into the sliding groove 25 as a whole. The through hole 22 is located at the end of the flow channel 5, realizing the automatic opening of the through hole 22 after the mold is closed. At this time, the raw material in the cavity 21 can be guided into the guide tube 15 through the through hole 22. During this period, there is no need to manually operate the retaining ring 23, which is simple and convenient.

[0040] like Figure 5 and Figure 6 As shown, a limiting block 26 is elastically connected to the inner wall of the retaining ring 23. A receiving groove 27 is provided on the retaining ring 23, and the limiting block 26 is slidably connected to the receiving groove 27. A second spring 28 is provided in the receiving groove 27 to drive the limiting block 26 to move outward. When the retaining ring 23 moves to the point where the limiting block 26 corresponds to the through hole 22, the second spring 28 drives the limiting block 26 to engage in the through hole 22, thereby positioning the retaining ring 23. In addition, the limiting block 26 can also clear blockages in the through hole 22. To prevent the through hole 22 from becoming blocked after long-term use, in this embodiment, the locking part 29 of the limiting block 26 that engages with the through hole 22 is hemispherical. This achieves locking without completely locking the block. After the retaining ring 23 is subjected to force, the limiting block 26 can still be dislodged from the through hole 22. This achieves the locking and unblocking function without affecting the retaining ring 23 retracting into the slide groove 25 after the spring block 8 moves down, ensuring that the limiting block 26 can automatically dislodge from the through hole 22 after the mold is closed.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An injection mold for automotive front light bezels, characterized in that: The application relates to a die casting machine, which comprises a fixed die (1), a movable die (2) and an ejection mechanism, wherein a spring block (8) is elastically connected to one side of the fixed die (1) facing the movable die (2), an inlet (13) is arranged on the spring block (8), a flow channel (5) is arranged on the fixed die (1) and communicates with the inlet (13), and a flow guide pipe (15) is detachably connected to the spring block (8) at the inlet (13).

2. The injection mold for a bezel of an automobile headlamp according to claim 1, wherein: The end diameter of the flow guide pipe (15) is larger than the diameter of the end opening of the flow channel (5).

3. The injection mold for a bezel of an automobile headlamp according to claim 1, wherein: An installation hole (16) is arranged on the spring block (8) for installing the flow guide pipe (15), and the flow guide pipe (15) is fixedly connected to the spring block (8) through screws.

4. The injection mold for a bezel of an automobile headlamp according to claim 1, wherein: One end of the flow guide pipe (15) is inserted into the flow channel (5) and away from the spring block (8), the end of the flow guide pipe (15) is located in the flow channel (5) when the spring block (8) is in the popped-up state, and the end surface of the flow guide pipe (15) on the side away from the fixed die (1) is flush with the end surface of the spring block (8).

5. The injection mold for a bezel of an automobile headlamp according to claim 4, wherein: The end of the flow guide pipe (15) inserted into the flow channel (5) has a convex ring (20), and the outer wall of the convex ring (20) abuts against the inner wall of the flow channel (5).

6. The injection mold for a bezel of an automobile headlamp according to claim 5, wherein: The side wall of the flow guide pipe (15) is provided with a lateral through hole (22), and a plurality of through holes (22) are uniformly distributed around the circumference, and the through hole (22) is located in the flow channel (5) when the spring block (8) is in the un-popped-up state.

7. The injection mold for a bezel of an automobile headlamp according to claim 6, wherein: The end of the flow guide pipe (15) away from the flow channel (5) has an installation part (18), the outer diameter of the installation part (18) is larger than the outer diameter of the flow guide pipe (15), a blocking ring (23) is slidably connected to the installation part (18), a first spring (24) is arranged on the installation part (18) to drive the blocking ring (23) to block the through hole (22), and the blocking ring (23) blocks the through hole (22) when the spring block (8) is in the popped-up state.

8. The injection mold for a bezel of an automobile headlamp according to claim 7, wherein: The end opening diameter of the flow channel (5) is matched with the flow guide pipe (15), the outer diameter of the blocking ring (23) is larger than the end opening diameter of the flow channel (5), a sliding groove (25) is arranged on the installation part (18) for the sliding shrinkage of the blocking ring (23), and the blocking ring (23) is compressed into the sliding groove (25) and is in the dislocation state with the through hole (22) when the mold is closed.

9. The injection mold for a bezel of an automobile headlamp according to claim 8, wherein: A limiting block (26) is elastically connected to the inner wall of the blocking ring (23) corresponding to the through hole (22), the limiting block (26) has a clamping part (29) clamped into the through hole (22), the clamping part (29) is in a semispherical shape, and a second spring (28) is arranged on the inner wall of the blocking ring (23) to drive the limiting block (26) to be clamped into the through hole (22).

10. The injection mold for a bezel of an automobile headlamp according to claim 1, wherein: An inclined guide strip (10) is arranged on the fixed die (1), a guide groove (11) matched with the guide strip (10) is arranged on the spring block (8), and a reset spring (12) is arranged on the fixed die (1) to drive the spring block (8) to pop up.

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