Forming mold for improving injection molding quality of fan-shaped chip

Abstract

The invention relates to a forming mold for improving the injection molding quality of a fan-shaped chip, which comprises a mold assembly, the mold assembly is mainly composed of a front mold and a rear mold, and the front mold and the rear mold are connected through a guide mechanism; and the rear mold core is connected to the top of the rear mold, a fan-shaped groove is formed in the top of the rear mold core in a downward penetrating mode, and an injection molding runner is formed in the position, located on the outer side of the arc position of the fan-shaped groove, of the top of the rear mold core. The invention relates to the technical field of molds. According to the forming mold for improving the injection molding quality of the fan-shaped chip, the injection molding runner is formed in the top of the rear mold core, and the at least two sprues are formed in the injection molding runner, so that injection molding pressure can be effectively reduced through simultaneous injection molding of the multiple sprues, and internal stress is prevented from being generated in a plastic part; therefore, the exhaust efficiency during injection molding can be guaranteed, vacuum bubbles generated in the plastic part due to poor exhaust effect can be avoided, and the quality of the chemiluminescence centrifugal disc quintuple-detection chip plastic part can be further improved.

Description

Technical Field

[0001] The invention relates to the technical field of molds, and in particular to a molding mold for improving the injection molding quality of fan-shaped chips. Background Art

[0002] The chemiluminescent centrifugal disk five-in-one test chip plastic is a microfluidic technology product used for chemiluminescent immunoassay. According to relevant information, the design of this chip is intended to improve the efficiency and accuracy of detection, especially in the scenario of multiple tests.

[0003] In the prior art, the chemiluminescent centrifugal disk five-in-one test chip plastic part is fan-shaped, with many slots distributed inside the plastic part, and the bottom of the slots are all right angles, which leads to stress concentration problems during injection molding of the plastic part. The wall thickness of the chip body of the plastic part is 1.8mm, and the wall thickness at the slot is 1.0mm. The difference in the wall thickness of the plastic part is too large, and shrinkage marks are prone to occur. Due to the structural limitations of the plastic part, the above-mentioned problems cannot be improved by modifying the plastic part, which leads to the performance of the chemiluminescent centrifugal disk five-in-one test chip plastic part being affected. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a molding die for improving the injection molding quality of fan-shaped chips, so as to solve the technical problems mentioned in the aforementioned background technology.

[0005] The aforementioned technical objectives of the present invention are achieved through the following technical solutions: A molding die for improving the injection molding quality of a fan-shaped chip includes a mold assembly, the mold assembly mainly consisting of a front mold and a rear mold, and the front mold and the rear mold are connected by a guide mechanism; The rear mold core is connected to the top of the rear mold, a fan-shaped groove is formed through the top of the rear mold core downward, an injection flow channel is formed at the top of the rear mold core at the outer side of the arc of the fan-shaped groove, at least two gates for injection into the fan-shaped groove are formed at intervals along the length direction of the injection flow channel, an overflow groove is formed at the top of the rear mold core at the side of the fan-shaped groove away from the injection flow channel, and an exhaust groove connected to the fan-shaped groove is formed at the top of the rear mold core at the outer side of the straight side of the fan-shaped groove; The mold core is fixedly connected in the fan-shaped groove. A plurality of through grooves are penetrated downward from the top of the mold core, and inserts are arranged in the through grooves.

[0006] Furthermore, the injection runner is arc-shaped, and the gates located at both ends of the injection runner are connected to the arc side of the fan-shaped groove near the straight side.

[0007] Furthermore, both ends of the overflow groove are respectively connected to the two straight sides of the fan-shaped groove, and the overflow port of the overflow groove is arranged at the melt-glue confluence position on the straight sides of the fan-shaped groove.

[0008] Furthermore, an air duct for exhaust is provided on the outer wall of the mold core, and a shallow exhaust port is provided through the top of the air duct upward, so that when the mold core is installed in the fan-shaped groove, a micro gap for exhaust is retained between the outer wall of the mold core and the inner wall of the fan-shaped groove.

[0009] Furthermore, a second shallow exhaust port is provided on the outer wall of the insert, so that when the insert is inserted into the through groove, a second micro gap for exhaust is left between the outer wall of the insert and the inner wall of the through groove.

[0010] Furthermore, a through hole is formed downwardly through the top of the insert, a ejector pin is slidably disposed in the through hole, and a shallow exhaust port three is processed on the outer wall of the ejector pin, so that when the ejector pin is inserted into the through hole, a micro gap three for air flow is retained between the outer wall of the ejector pin and the inner wall of the through hole.

[0011] Furthermore, a cooling water channel is provided in the rear mold core, and the cooling water channel surrounds the outer side of the fan-shaped groove.

[0012] In summary, the present invention includes at least one beneficial technical effect: 1. The molding die for improving the injection molding quality of the fan-shaped chip has an injection flow channel provided at the top of the rear mold core, and at least two gates are provided in the injection flow channel, so that the injection molding pressure can be effectively reduced by simultaneously injecting through multiple gates, and internal stress can be avoided in the plastic part. Moreover, by providing an exhaust groove at the top of the rear mold core, the exhaust efficiency during injection molding can be ensured, and vacuum bubbles can be avoided in the plastic part due to poor exhaust effect, so that the quality of the chemiluminescent centrifugal disk five-in-one inspection chip plastic part can be further improved; 2. This molding mold for improving the injection molding quality of fan-shaped chips has an overflow groove on the top of the rear mold core, and the overflow port of the overflow groove is set at the melt convergence position on the straight side of the fan-shaped groove, so that when the melt converges, it can be squeezed into the overflow groove through the overflow port, and finally the excess overflow of the plastic part is cut off, so that the weld line in the plastic part can be eliminated, which can further improve the quality of the chemiluminescent centrifugal disk five-in-one inspection chip plastic part. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 The present invention is a schematic structural diagram of a molding die for improving the injection molding quality of a fan-shaped chip.

[0015] Figure 2The present invention is a schematic structural diagram of a rear mold core in a molding die for improving the injection molding quality of a fan-shaped chip.

[0016] Figure 3 The present invention is a schematic structural diagram of a mold core, an insert and an ejector pin in a molding mold for improving the injection molding quality of a fan-shaped chip.

[0017] Figure 4 for Figure 3 A magnified view of the structure at center.

[0018] Figure 5 for Figure 3 A magnified view of the structure at point B.

[0019] Figure 6 The present invention is a schematic structural diagram of a mold core and an insert in a molding mold for improving the injection molding quality of a fan-shaped chip.

[0020] Figure 7 The present invention is a schematic structural diagram of a mold core in a molding mold for improving the injection molding quality of a fan-shaped chip.

[0021] Figure 8 It is a schematic diagram of the three-dimensional structure of a cross-sectional view of the position of a cooling water channel in a rear mold core in an upward angle view of a molding mold for improving the injection molding quality of a fan-shaped chip according to the present invention.

[0022] Fig. 9 The present invention is a schematic structural diagram of a molding die during injection molding for improving the injection molding quality of a fan-shaped chip.

[0023] Fig.10 The present invention is a schematic structural diagram of a molding mold plastic part for improving the injection molding quality of a fan-shaped chip.

[0024] In the figure, 1. mold assembly; 101. front mold; 102. rear mold; 2. rear mold core; 3. mold core; 4. fan-shaped groove; 5. injection runner; 6. gate; 7. overflow groove; 8. vent groove; 9. through groove; 10. insert; 11. overflow port; 12. air channel; 13. shallow vent 1; 14. shallow vent 2; 15. through hole; 16. ejector pin; 17. shallow vent 3; 18. cooling water channel. DETAILED DESCRIPTION

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0026] Example: Reference Figure 1 - Fig.10 The present invention discloses a molding die for improving the injection molding quality of a fan-shaped chip, including a mold assembly 1, the mold assembly 1 mainly consisting of a front mold 101 and a rear mold 102, the front mold 101 and the rear mold 102 are connected by a guide mechanism; The rear mold core 2 is connected to the top of the rear mold 102. A fan-shaped groove 4 is formed downwardly through the top of the rear mold core 2. An injection runner 5 is formed at the top of the rear mold core 2 at the outer side of the arc of the fan-shaped groove 4. At least two gates 6 for injection to the fan-shaped groove 4 are formed at intervals along the length direction of the injection runner 5. An overflow groove 7 is formed at the top of the rear mold core 2 at the side of the fan-shaped groove 4 away from the injection runner 5. An exhaust groove 8 connected to the fan-shaped groove 4 is formed at the top of the rear mold core 2 at the outer side of the straight side of the fan-shaped groove 4. The mold core 3 is fixedly connected in the fan-shaped groove 4. A plurality of through grooves 9 are formed downwardly through the top of the mold core 3. Inserts 10 are arranged in the through grooves 9.

[0027] In this embodiment, observe Figure 1 It can be found that by providing a mold assembly 1 consisting of a front mold 101 and a rear mold 102, and the front mold 101 and the rear mold 102 are connected by a guiding mechanism, a rear mold core 2 is connected to the top of the rear mold 102, and a fan-shaped groove 4 is opened downward through the top of the rear mold core 2, and a mold core 3 is fixedly connected in the fan-shaped groove 4, so that when the front mold 101 and the rear mold 102 are closed, an injection cavity is formed between the front mold 101 and the rear mold 102, thereby being used for injection molding of a chemiluminescent centrifugal disk five-in-one detection chip plastic part.

[0028] Because all the slots on the functional surface of the chemiluminescent centrifugal disk five-in-one test chip except the microchannel need to maximize the sharp corners of the mouth to ensure the sealing effect, so the observation Figure 7 It can be found that a plurality of through grooves 9 are provided downwardly through the top of the mold core 3, and the shape of the through grooves 9 is the same as the hole shape of the chemiluminescent centrifugal disk five-in-one test chip plastic part. Figure 6 As shown, inserts 10 are connected one by one in the through grooves 9, and when processing the inserts 10, a tool with an absolutely sharp angle is used to maximize the sharp angle of the mouth, which can effectively improve the product quality of the chemiluminescent centrifugal disk five-in-one detection chip plastic part after injection molding.

[0029] However, since there are many slots in the plastic part of the chemiluminescent centrifugal disc five-inspection chip, and the bottoms of the slots are all right angles, stress concentration will occur during injection molding of the plastic part. At the same time, the injection molding pressure of PC material is generally below 130Mpa. If the holding time is short, the plastic part will shrink or shrinkage cavities and vacuum bubbles will appear. If the holding time is extended, the vacuum bubbles can be eliminated and the size is stable. However, if the holding time is too long, the plastic part is prone to internal stress and cracking. At the same time, the wall thickness of the chip body of the plastic part is 1.8mm, and the wall thickness at the slot is 1.0mm. The difference in wall thickness of the plastic part is too large, which is prone to shrinkage marks.

[0030] So combined Figure 1 and Figure 2It can be found that an injection molding channel 5 is opened at the outer side of the arc of the fan-shaped groove 4 at the top of the rear mold core 2, and at least two gates 6 for injection molding into the fan-shaped groove 4 are spaced apart along the length direction of the injection molding channel 5. The injection molding channel 5 is arc-shaped, and the gates 6 located at both ends of the injection molding channel 5 are connected to the arc side of the fan-shaped groove 4 near the straight side, so that the chemiluminescent centrifugal disk five-in-one detection chip plastic part can be made as Fig. 9 As shown, during injection molding, multiple gates 6 are used for simultaneous injection molding, which can effectively reduce the injection molding pressure, thereby avoiding the generation of internal stress in the plastic part.

[0031] Since there are holes in the plastic part of the chemiluminescent centrifugal disk five-in-one inspection chip, weld lines will inevitably appear when the melt passes over the holes, and when multiple gates 6 are injected simultaneously, weld lines will also appear at the confluence of two streams of melt, making the final plastic part look like Fig.10 As shown, the weld line appears at the C and D positions in the figure. Therefore, in order to avoid the occurrence of weld lines, observe Figure 2 It can be found that an overflow groove 7 is provided at the top of the rear mold core 2 on the side of the fan-shaped groove 4 away from the injection runner 5, so that the two ends of the overflow groove 7 are respectively connected to the two straight sides of the fan-shaped groove 4, and the overflow port 11 of the overflow groove 7 is set at the melt confluence position on the straight side of the fan-shaped groove 4. At this time, when the melt converges, it will be squeezed into the overflow groove 7 through the overflow port 11, so that the plastic part is as shown in FIG. Fig. 9 As shown in the figure, the weld line can be eliminated by cutting off the excess overflow of the plastic part.

[0032] Vacuum bubbles are caused by many factors, such as too thick glue, insufficient exhaust slots, too fast injection speed, etc. The injection speed can be reduced by adjusting the parameters of the machine. The shape of the chemiluminescent centrifugal disk five-in-one inspection chip plastic part cannot be changed, so the glue thickness cannot be adjusted. Figure 2 It can be found that by opening an exhaust groove 8 connected to the fan-shaped groove 4 at the top of the rear mold core 2 and located on the outer side of the straight side of the fan-shaped groove 4, and providing a plurality of shallow exhaust ports connected to the fan-shaped groove 4 in the exhaust groove 8, the exhaust efficiency can be effectively improved, the generation of vacuum bubbles can be avoided as much as possible, and the quality of the chemiluminescent centrifugal disk five-in-one inspection chip plastic parts can be further improved.

[0033] Among them, since the improvement of this application does not involve the guide mechanism, the structure and composition of the guide mechanism can adopt the existing technology and will not be elaborated here.

[0034] In a further preferred embodiment of the present invention, Figure 3 - Figure 5 As shown, the outer wall of the mold core 3 is provided with an air passage 12 for exhaust, and a shallow exhaust port 13 is provided through the top of the air passage 12 upwardly, so that when the mold core 3 is installed in the fan-shaped groove 4, a micro gap for exhaust is left between the outer wall of the mold core 3 and the inner wall of the fan-shaped groove 4; The outer wall of the insert 10 is provided with a shallow exhaust port 14, so that when the insert 10 is inserted into the through groove 9, a micro gap 14 for exhaust is left between the outer wall of the insert 10 and the inner wall of the through groove 9; A through hole 15 is formed downwardly through the top of the insert 10, and a ejector pin 16 is slidably disposed in the through hole 15. A shallow exhaust port 3 17 is processed on the outer wall of the ejector pin 16, so that when the ejector pin 16 is inserted into the through hole 15, a micro gap 3 for air flow is retained between the outer wall of the ejector pin 16 and the inner wall of the through hole 15.

[0035] In this embodiment, observe Figure 3 It can be found that by opening an air duct 12 for exhaust on the outer wall of the core 3, and opening a shallow exhaust port 13 through the top of the air duct 12, when the core 3 is installed in the fan-shaped groove 4, a micro gap for exhaust is left between the outer wall of the core 3 and the inner wall of the fan-shaped groove 4. Figure 4 It can be found that Figure 4 yes Figure 3 The enlarged view of point A in the middle Figure 4 It can be seen that the outer wall of the insert 10 is provided with a shallow exhaust port 14, so that when the insert 10 is inserted into the through groove 9, a micro gap 14 for exhaust is left between the outer wall of the insert 10 and the inner wall of the through groove 9.

[0036] By setting the micro gap one and the micro gap two, the exhaust efficiency can be effectively improved, so that when the chemiluminescent centrifugal disk five-inspection chip plastic product is injected, the cavity can be quickly exhausted, thereby avoiding the generation of vacuum bubbles in the chemiluminescent centrifugal disk five-inspection chip plastic product due to poor exhaust.

[0037] However, since the bottom of the slot of the chemiluminescent centrifugal disk five-in-one test chip plastic part is at a right angle, it will make demoulding more difficult. Figure 3 and Figure 5 It can be found that a through hole 15 is opened downwardly through the top of the insert 10, and a ejector pin 16 is slidably arranged in the through hole 15. At this time, when the chemiluminescent centrifugal disk five-in-one test chip plastic part is demolded, external force is applied to the plastic part by setting multiple ejector pins 16 at the same time, thereby reducing local damage to the plastic part caused by excessive pressure.

[0038] When the ejector pin 16 pushes the plastic part to be demoulded, the distance between the inner wall of the plastic part and the mold core 3 increases, which will generate a huge negative pressure to prevent demoulding, and in severe cases, the plastic part will be damaged. Figure 5It can be found that the outer wall of the ejector pin 16 is processed with a shallow exhaust port 3 17, so that when the ejector pin 16 is inserted into the through hole 15, a micro gap 3 for air flow is retained between the outer wall of the ejector pin 16 and the inner wall of the through hole 15. When the ejector pin 16 is demoulded, air can enter between the plastic part and the mold core 3 through the micro gap 3, avoiding the generation of negative pressure that affects the demoulding, thereby ensuring the demoulding effect of the plastic part.

[0039] In a further preferred embodiment of the present invention, Figure 2 and Figure 8 As shown, a cooling water channel 18 is provided in the rear mold core 2 , and the cooling water channel 18 surrounds the outer side of the fan-shaped groove 4 .

[0040] In this embodiment, by opening a cooling water channel 18 in the rear mold core 2 and surrounding the outer side of the fan-shaped groove 4, the plastic part can be cooled and the shaping of the plastic part can be accelerated, thereby improving the production efficiency of the plastic part.

[0041] The implementation principle of the above embodiment is: when producing the chemiluminescent centrifugal disk five-in-one test chip plastic part, the melt is injected into the mold assembly 1 through the pouring system so that the melt is Fig. 9 The state shown in FIG. 1 flows into the injection molding flow channel 5 along the main flow channel, and then enters the fan-shaped groove 4 through multiple gates 6, so that the molten glue is limited by the fan-shaped groove 4 and the mold core 3 to form a chemiluminescent centrifugal disk five-joint inspection chip plastic part. When the molten glue is injected into the fan-shaped groove 4, the air in the fan-shaped groove 4 will be discharged through the exhaust groove 8, the micro gap one and the micro gap two, which can effectively avoid the generation of vacuum bubbles and improve the quality of the chemiluminescent centrifugal disk five-joint inspection chip plastic part. Finally, when demoulding, the front mold 101 and the rear mold 102 are separated, and the plastic part is ejected by the ejector pin 16 to realize the injection molding of the chemiluminescent centrifugal disk five-joint inspection chip plastic part.

[0042] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A molding die for improving the injection molding quality of fan-shaped chips, characterized in that: The mold assembly (1) comprises a front mold (101) and a rear mold (102), wherein the front mold (101) and the rear mold (102) are connected via a guide mechanism; A rear mold core (2) is connected to the top of the rear mold (102); a fan-shaped groove (4) is provided through the top of the rear mold core (2) and extends downward; an injection flow channel (5) is provided at the top of the rear mold core (2) and is located outside the arc of the fan-shaped groove (4); at least two gates (6) for injecting into the fan-shaped groove (4) are provided at intervals along the length direction of the injection flow channel (5); an overflow groove (7) is provided at the top of the rear mold core (2) and is located on the side of the fan-shaped groove (4) away from the injection flow channel (5); and an exhaust groove (8) is provided at the top of the rear mold core (2) and is located outside the straight side of the fan-shaped groove (4) and is connected to the fan-shaped groove (4); The mold core (3) is fixedly connected in the fan-shaped groove (4), and a plurality of through grooves (9) are formed through the top of the mold core (3) and extend downward, and inserts (10) are arranged in the through grooves (9).

2. A molding die for improving the injection molding quality of a fan-shaped chip according to claim 1, characterized in that: The injection molding runner (5) is arc-shaped, and the gates (6) located at both ends of the injection molding runner (5) are connected to the arc side of the fan-shaped groove (4) at a position close to the straight side.

3. A molding die for improving the injection molding quality of a fan-shaped chip according to claim 2, characterized in that: The two ends of the overflow groove (7) are respectively connected to the two straight sides of the fan-shaped groove (4), and the overflow port (11) of the overflow groove (7) is arranged at the melt-glue confluence position on the straight side of the fan-shaped groove (4).

4. A molding die for improving the injection molding quality of a fan-shaped chip according to claim 3, characterized in that: The outer wall of the mold core (3) is provided with an air duct (12) for exhaust, and a shallow exhaust port (13) is provided through the top of the air duct (12) and extends upward, so that when the mold core (3) is installed in the fan-shaped groove (4), a micro gap for exhaust is left between the outer wall of the mold core (3) and the inner wall of the fan-shaped groove (4).

5. A molding die for improving the injection molding quality of fan-shaped chips according to claim 4, characterized in that: The outer wall of the insert (10) is provided with a shallow exhaust port 2 (14), so that when the insert (10) is inserted into the through groove (9), a micro gap 2 for exhaust is left between the outer wall of the insert (10) and the inner wall of the through groove (9).

6. A molding die for improving the injection molding quality of fan-shaped chips according to claim 5, characterized in that: A through hole (15) is provided through the top of the insert (10) and extends downward therethrough. A ejector pin (16) is slidably disposed in the through hole (15). The outer wall of the ejector pin (16) is processed with a shallow exhaust port (17), so that when the ejector pin (16) is inserted into the through hole (15), a micro gap (17) for air flow is retained between the outer wall of the ejector pin (16) and the inner wall of the through hole (15).

7. A molding die for improving the injection molding quality of a fan-shaped chip according to claim 6, characterized in that: A cooling water channel (18) is provided in the rear mold core (2), and the cooling water channel (18) surrounds the outer side of the fan-shaped groove (4).

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