A high-precision PEI decorative part mold

Abstract

This utility model relates to the field of mold technology, and in particular to a high-precision PEI decorative part mold, including multiple mold inserts installed on the mold core. The mold inserts are formed with mold cavities, and venting inserts are installed on the mold inserts. The surface of the venting inserts is recessed with multiple main venting channels for gas flow, and one end of each of the main venting channels is connected to the venting cavity. The venting inserts are recessed with sliding grooves, and inclined ejector blocks are movably arranged in the sliding grooves. The surface of the inclined ejector blocks is formed with secondary venting channels that are connected to the main venting channels. The multiple main channels collect the gas from different areas of the cavity into the venting cavity, and then quickly discharge it to the outside of the mold through the through venting holes, significantly shortening the gas flow path and reducing resistance. When the PEI melt fills to the depth of the cavity, the inclined ejector connecting post slides along the groove, causing the inclined ejector block to move. The secondary venting channels on its surface are always connected to the main venting channels, accurately capturing the residual gas at the melt front.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a high-precision PEI decorative part mold. Background Technology

[0002] PEI decorative parts refer to decorative components made primarily of polyetherimide (PEI). PEI is a high-performance engineering plastic with properties such as high temperature resistance (long-term service temperature up to 180℃), high strength (tensile strength exceeding 110MPa), flame retardancy (UL94-V0 rating), and excellent dimensional stability. Furthermore, complex shapes can be achieved through processes such as injection molding and spraying, making it widely used in high-end decorative applications.

[0003] PEI decorative parts are typically manufactured using injection molds. During the process of conveying the molten plastic through the screw and injecting it through the nozzle, surrounding air is drawn in. The mold cavity is not a complete vacuum before injection, and residual air remains. If the gas in the cavity cannot escape, the gas pressure prevents the molten material from completely filling the cavity, resulting in incomplete product edges. Gas under high pressure is forced into the interior of the molten material, and after cooling, it forms bubbles or pinholes on the surface or inside the product. Utility Model Content

[0004] The purpose of this invention is to provide a high-precision PEI decorative mold to address the shortcomings of existing technologies.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A high-precision PEI decorative part mold includes multiple mold inserts installed on the mold core. Each mold insert has a mold cavity. Each mold insert is equipped with an exhaust insert. The surface of the exhaust insert is recessed and formed with multiple main exhaust channels for gas flow. An exhaust cavity is formed in the middle of the exhaust insert. A through exhaust hole is formed in the middle of the exhaust cavity. One end of each of the multiple main exhaust channels is connected to the exhaust cavity. The exhaust insert has a recessed groove, a movably mounted inclined top block is provided in the groove, an inclined top connecting column is connected to the bottom of the inclined top block, the groove has a through groove for the inclined top connecting column to slide, and a secondary exhaust channel communicating with the main exhaust channel is formed on the surface of the inclined top block.

[0006] Furthermore: the mold insert has an insert mounting groove, and the venting insert is installed in the insert mounting groove.

[0007] Furthermore: a stepped surface is formed at the inner ring of the insert mounting groove, the mold cavity is arranged along the length of the stepped surface, and the mold cavity is coaxially aligned with the insert mounting groove.

[0008] Furthermore: the surface of the sloping top block is flush with the surface of the exhaust insert.

[0009] Furthermore: there are multiple row slots, and each row slot has a different shape, with the shape of the inclined top block matching the shape of the row slot.

[0010] Furthermore: The bottom of the mold insert is provided with a demolding mechanism that drives the lifting and lowering movement of the inclined ejector block. The demolding mechanism includes an inclined ejector mounting plate located below the mold insert. The inclined ejector mounting plate can move longitudinally closer to or away from the mold insert. The inclined ejector mounting plate is connected to multiple inclined ejector connecting pillars.

[0011] Furthermore, the demolding mechanism also includes a demolding lifting cylinder installed at the bottom of the mold insert. The demolding lifting cylinder is equipped with a transverse connecting plate, which is connected to the inclined top mounting plate.

[0012] Furthermore: the inclined top mounting plate is formed with an inclined top guide hole for the inclined top connecting column to pass through, and the inclined top guide hole is provided with a locking structure for locking or releasing the inclined top connecting column.

[0013] Furthermore, the locking structure includes multiple locking grooves spaced apart along the length of the inclined top connecting column, and a locking rod that can telescopically engage with the locking grooves is installed on the side wall of the inclined top guide hole.

[0014] Furthermore: the sidewall of the inclined guide hole is formed with a transversely outwardly through movable threaded groove, and the locking rod is a threaded rod.

[0015] The beneficial effects of this invention are as follows: Multiple main channels collect gas from different areas of the cavity into the venting chamber, and then quickly discharge it to the outside of the mold through the through venting hole, significantly shortening the gas flow path and reducing resistance; when the PEI melt fills to the depth of the cavity, the inclined ejector connecting column slides along the groove to drive the inclined ejector block to move, and the secondary venting channel on its surface always remains connected with the main venting channel, accurately capturing the residual gas at the front edge of the melt; it can solve the problem of incomplete edge filling, avoid the formation of bubbles or pinholes on the surface or inside the product, and improve the molding qualification rate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the mold insert.

[0017] Figure 2 This is a schematic diagram of the exploded structure of the mold insert.

[0018] Figure 3 This is a cross-sectional structural diagram showing the connection between the inclined top connecting column and the inclined top mounting plate.

[0019] The reference numerals in the figures include: 1-Mold insert, 11-Mold cavity, 12-Ventilation insert, 13-Main venting channel, 14-Ventilation chamber, 15-Ventilation hole 16-Slide groove, 17-Stepped surface, 18-Secondary exhaust channel, 19-Installation mounting groove, 2-Demolding mechanism, 20-Angled top block, 21-Angled top connecting column, 22-Pass through groove, 23-Angled top mounting plate, 24-Demolding lifting cylinder, 25-Horizontal connecting plate, 26-Angled top guide hole, 27-Locking groove, 28 - Locking rod, 29 - Movable threaded groove. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings.

[0021] As shown in the figure A high-precision PEI decorative part mold includes multiple mold inserts 1 installed on the mold core. Each mold insert 1 has a mold cavity 11. Each mold insert 1 has an exhaust insert 12. The surface of the exhaust insert 12 is recessed and formed with multiple main exhaust channels 13 for gas flow. An exhaust chamber 14 is formed in the middle of the exhaust insert 12. An exhaust hole 15 is formed in the middle of the exhaust chamber 14. One end of each of the multiple main exhaust channels 13 is connected to the exhaust chamber 14. The exhaust insert 12 is recessed and formed with a sliding groove 16. An inclined ejector block 20 is movably disposed in the sliding groove 16. An inclined ejector connecting post 21 is connected to the bottom of the inclined ejector block 20. The sliding groove 16 is formed with a through groove 22 for the inclined ejector connecting post 21 to slide. The surface of the inclined ejector block 20 is formed with a secondary exhaust channel 18 that communicates with the main exhaust channels 13.

[0022] Multiple main channels collect gas from different areas of the cavity into the venting chamber 14, and then quickly discharge it to the outside of the mold through the through venting hole 15, significantly shortening the gas flow path and reducing resistance. When the PEI melt fills to the depth of the cavity, the inclined ejector connecting post 21 slides along the through groove 22, causing the inclined ejector block 20 to move. The secondary venting channel 18 on its surface is always connected to the main venting channel 13, accurately capturing residual gas at the front edge of the melt. This can solve the problem of incomplete edge filling and avoid the formation of bubbles or pinholes on the surface or inside the product, thereby improving the molding qualification rate.

[0023] During demolding, simply lift the inclined ejector pin 21, and the inclined ejector block 20 can eject the molded PEI decorative part from the mold cavity 11, achieving rapid demolding.

[0024] Furthermore, the mold insert 1 is formed with an insert mounting groove 19, and the venting insert 12 is installed in the insert mounting groove 19. The mold insert 1 achieves the positioning and installation of the venting insert 12 through the pre-made insert mounting groove 19. With the limiting effect of the inner ring stepped surface 17, the assembly deviation between the venting insert 12 and the mold insert 1 is controlled within 0.01-0.02mm. The design of the mold cavity 11 arranged along the length direction of the stepped surface 17 and coaxially aligned with the insert mounting groove 19 ensures that the central axis of the cavity is completely coincident with the central axis of the venting system. The gas flow path and the melt filling direction form a precise axial correspondence. This structural synergy can avoid the problem of misalignment of the venting channel caused by assembly offset, reduce the venting efficiency deviation of different cavities to less than 5%, and significantly improve the dimensional consistency and quality stability of PEI decorative parts when multi-cavity molding.

[0025] The inner ring of the insert mounting groove 19 has a stepped surface 17. The mold cavity 11 is arranged along the length of the stepped surface 17 and is coaxially aligned with the insert mounting groove 19. The stepped surface 17 of the inner ring of the insert mounting groove 19 not only provides a stable support foundation for the mold cavity 11, but also forms a gradient guiding effect on the PEI melt through the stepped structure. The orderly filling guided by the stepped surface 17 can make the gas at the melt front more efficiently captured by the main venting channel 13, further reducing the amount of gas residue in the cavity. The surface of the inclined ejector block 20 is flush with the surface of the venting insert 12. The structural design that keeps the surface of the inclined ejector block 20 flush with the surface of the venting insert 12 solves the problem of the parting line step caused by the height difference between the inclined ejector block 20 and the surrounding parts in traditional molds. Even during the sliding process of the inclined ejector block 20, the flush surface can always maintain the sealing of the venting channel and prevent the melt from seeping into the channel and causing blockage.

[0026] There are multiple slide slots 16, and each slide slot 16 has a different shape. The shape of the inclined ejector block 20 is adapted to the shape of the slide slot 16. The adaptation of the slide slots 16 and the shape of the inclined ejector block 20 ensures the structural stability of the mold cavity 11, ensures the precision of the formed PEI decorative parts, and meets the stringent requirements of high-end decorative parts for flawless appearance.

[0027] Specifically, the bottom of the mold insert 1 is equipped with a demolding mechanism 2 that drives the lifting and lowering movement of the inclined ejector blocks 20. The demolding mechanism 2 includes an inclined ejector mounting plate 23 located below the mold insert 1. The inclined ejector mounting plate 23 can move longitudinally closer to or further away from the mold insert 1. The inclined ejector mounting plate 23 is connected to multiple inclined ejector connecting pillars 21. The inclined ejector mounting plate 23 can slowly rise under the action of the driving device, and drive the inclined ejector blocks 20 to slide along the slide groove 16 through the inclined ejector connecting pillars 21. The inclined ejector blocks 20 complete the final residual gas discharge through the secondary exhaust channel 18, and directly lift the molded PEI decorative part to achieve demolding. In addition, the integrated connection between the inclined ejector mounting plate 23 and the multiple inclined ejector connecting pillars 21 ensures that the lifting and lowering movements of all the inclined ejector blocks 20 are completely synchronized.

[0028] Preferably, the demolding mechanism 2 further includes a demolding lifting cylinder 24 installed at the bottom of the mold insert 1. The demolding lifting cylinder 24 is equipped with a transverse connecting plate 25, which is connected to the inclined ejector mounting plate 23. The transverse connecting plate 25 converts the single-point power of the demolding lifting cylinder 24 into a surface contact drive on the inclined ejector mounting plate 23; it can evenly distribute the driving force of the demolding lifting cylinder 24 to multiple inclined ejector connecting columns 21, thereby further reducing the displacement deviation of each inclined ejector block 20.

[0029] In one embodiment, the inclined top mounting plate 23 is formed with an inclined top guide hole 26 for the inclined top connecting post 21 to pass through. The inclined top guide hole 26 is provided with a locking structure for locking or unlocking the inclined top connecting post 21. The locking structure includes a plurality of locking grooves 27 formed at intervals along the length of the inclined top connecting post 21, and a locking rod 28 is installed on the side wall of the inclined top guide hole 26, which can telescopically engage with the locking grooves 27 for locking.

[0030] In this embodiment, when the lifting and lowering movements of all inclined ejector blocks 20 need to be completely synchronized, all locking rods 28 are rotated. The locking rods 28 move radially along the inclined ejector guide hole 26 and continuously approach the inclined ejector connecting post 21 until they engage with the locking groove 27. At this time, each inclined ejector connecting post 21 is locked to the inclined ejector guide hole 26 corresponding to the inclined ejector mounting plate 23. Therefore, under the drive of the demolding lifting cylinder 24, the lifting and lowering movements of all inclined ejector blocks 20 are completely synchronized.

[0031] In another embodiment, when individual inclined ejector blocks 20 need to move up and down, the corresponding locking rod 28 is rotated, and the bottom of the remaining unlocked inclined ejector connecting columns 21 are locked to the fixed plate. Under the drive of the demolding lifting cylinder 24, only the inclined ejector connecting columns 21 locked to the inclined ejector mounting plate 23 will move up and down.

[0032] In this embodiment, for PEI products with a deep undercut on one side and a shallow flat surface on the other, the inclined top connecting post 21 in the deep undercut area can be locked separately, allowing it to push the product out of the deep cavity first. The inclined top connecting posts 21 in the remaining areas are kept stationary by the fixing plate. After the deep undercut is released, all locking rods 28 can be unlocked to complete the overall demolding. This avoids problems such as corner cracking and surface scratches caused by concentrated stress on irregularly shaped structures.

[0033] The ability to quickly switch between two locking modes allows a single mold to cover both standardized mass production and customized small-batch production scenarios: when mass-producing standardized symmetrical parts, the synchronous locking mode ensures efficient and stable production; when producing customized irregular-shaped parts in small batches, the independent locking mode is switched to meet the differentiated demolding requirements.

[0034] Preferably, the sidewall of the inclined guide hole 26 is formed with a transversely outwardly through movable threaded groove 29, and the locking rod 28 is a threaded rod. By rotating the locking rod 28, the locking rod 28 engages with the movable threaded groove 29 to move, thereby locking or moving away from the locking groove 27.

[0035] In summary, this utility model possesses the aforementioned excellent characteristics, enabling it to achieve unprecedented efficiency in use and thus become a highly practical product.

[0036] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A high-precision PEI decorative part mold, comprising multiple mold inserts mounted on a mold core, wherein the mold inserts are formed with mold cavities, characterized in that: The mold insert is equipped with an exhaust insert. The surface of the exhaust insert is recessed and formed with multiple main exhaust channels for gas flow. An exhaust cavity is formed in the middle of the exhaust insert, and a through exhaust hole is formed in the middle of the exhaust cavity. One end of each of the multiple main exhaust channels is connected to the exhaust cavity. The exhaust insert has a recessed groove, a movably mounted inclined top block is provided in the groove, an inclined top connecting column is connected to the bottom of the inclined top block, the groove has a through groove for the inclined top connecting column to slide, and a secondary exhaust channel communicating with the main exhaust channel is formed on the surface of the inclined top block.

2. The high-precision PEI decorative part mold according to claim 1, characterized in that: The mold insert is formed with an insert mounting groove, and the venting insert is installed in the insert mounting groove.

3. The high-precision PEI decorative part mold according to claim 2, characterized in that: The inner ring of the insert mounting groove is formed with a stepped surface, and the mold cavity is arranged along the length of the stepped surface. The mold cavity is coaxially aligned with the insert mounting groove.

4. A high-precision PEI decorative part mold according to claim 3, characterized in that: The surface of the inclined top block is flush with the surface of the exhaust insert.

5. A high-precision PEI decorative part mold according to claim 1, characterized in that: There are multiple row slots, and each row slot has a different shape. The shape of the inclined top block is adapted to the shape of the row slot.

6. A high-precision PEI decorative mold according to claim 1 or 4, characterized in that: The bottom of the mold insert is provided with a demolding mechanism that drives the inclined ejector block to move up and down. The demolding mechanism includes an inclined ejector mounting plate located below the mold insert. The inclined ejector mounting plate can move longitudinally closer to or away from the mold insert. The inclined ejector mounting plate is connected to multiple inclined ejector connecting columns.

7. A high-precision PEI decorative part mold according to claim 6, characterized in that: The demolding mechanism also includes a demolding lifting cylinder installed at the bottom of the mold insert. The demolding lifting cylinder is equipped with a transverse connecting plate, which is connected to the inclined top mounting plate.

8. A high-precision PEI decorative part mold according to claim 7, characterized in that: The inclined top mounting plate is formed with an inclined top guide hole for the inclined top connecting column to pass through, and the inclined top guide hole is provided with a locking structure for locking or releasing the inclined top connecting column.

9. A high-precision PEI decorative part mold according to claim 8, characterized in that: The locking structure includes multiple locking grooves spaced apart along the length of the inclined top connecting column, and a locking rod that can telescopically engage with the locking grooves is installed on the side wall of the inclined top guide hole.

10. A high-precision PEI decorative mold according to claim 9, characterized in that: The sidewall of the inclined top guide hole is formed with a transversely outwardly through movable threaded groove, and the locking rod is a threaded rod.

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