Injection mold
By adding a discharge channel and a material pulling mechanism to the injection mold, the fluidity and temperature of the slurry are maintained, the problem of the fusion line at the end of the mold cavity is solved, and the product quality and production efficiency are improved.
Patent Information
- Application Number
- CN202511389181.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-26
- Publication Date
- 2025-12-05
AI Technical Summary
Existing injection molds are prone to forming fusion lines at the ends of complex mold cavities, leading to reduced part strength, appearance defects, and easy cracking. Conventional methods are difficult to completely eliminate this problem, which increases energy consumption or causes other problems.
Adding a discharge channel to the injection mold allows the slurry to continue flowing and overflowing at the end of the mold cavity, maintaining a high temperature and avoiding localized cooling. Combined with the material pulling mechanism and air blowing assembly, the slurry head is automatically cleared, ensuring effective flow at the fluid interface at the divergence and re-merging point.
It effectively avoids the formation of fusion lines, improves the yield and reliability of injection molded products, simplifies the production process, reduces energy consumption and equipment complexity, and improves production efficiency.
Smart Images
Figure CN121062142A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of mold structure, and particularly relates to an injection mold. BACKGROUND
[0002] Injection molding is a molding method in which a polymer material is injected into a closed mold cavity in a molten state, and the molded product is obtained by cooling and solidification. With the increasing complexity of the structure and function of plastic products, flow separation and recombination often occur inside the mold cavity. This is particularly common in products with holes, frames, or partition structures at the end of the cavity (such as ribbed thin-walled components, multi-cavity components, window frame-like parts, etc.). When the injection melt encounters a bifurcation during flow, multiple flow channels are formed, and then recombine downstream. Due to the high thermal conductivity of the mold metal and the fact that the mold cavity wall temperature is usually lower than the temperature of the molten plastic, the melt at the end of the flow separation and recombination will cool faster and form a "fusion line" (also known as a weld line or cold joint).
[0003] The fusion line position is often a weak area of the product, which manifests as a decrease in mechanical strength, a decrease in impact resistance, appearance defects (visible lines or color differences), and a tendency to crack or break during subsequent use or processing (such as assembly, stress). In particular, for parts with concentrated stress or frequent stress, the failure rate of the product along the fusion line increases significantly, affecting product quality and service life.
[0004] Common methods to reduce or avoid fusion lines include increasing injection speed and mold temperature, optimizing gate location and flow channel design, using external heating or variable temperature injection molding processes, etc. However, these measures still have difficulty completely eliminating the fusion line problem in complex structures with holes or frames at the end of the mold cavity: on the one hand, increasing the overall mold temperature or injection parameters increases energy consumption and cycle time, and may cause new problems such as warping or burning for thin-walled or heat-sensitive materials; on the other hand, changing the gate location or flow channel shape alone may still result in local flow stagnation or early cooling at the end of the cavity, leading to the formation of a fusion line when recombining.
[0005] Therefore, in view of the technical problem that fusion lines are easily formed at the end of the mold cavity of injection molded parts with holes or frame structures and lead to cracking, there is an urgent need for a mold structure that can avoid the formation of fusion lines due to local cooling at the flow separation and recombination point without significantly increasing the complexity of the process and energy consumption. SUMMARY
[0006] The purpose of the present application is to provide an injection mold that can effectively avoid the formation of fusion lines at the end of the injection molded product with hole or frame structures.
[0007] In order to achieve the above object, the present application provides an injection mold, which comprises a fixed mold and a movable mold, the fixed mold comprises a base and a fixed mold body arranged on the base, the movable mold comprises a cover plate and a movable mold body arranged on the cover plate, and the movable mold body and the fixed mold body jointly form a mold cavity when the mold is closed; the movable mold body comprises a feeding port and a discharging port which are in communication with the mold cavity, the cover plate is further provided with a feeding channel corresponding to the feeding port and a discharging channel corresponding to the discharging port, the feeding channel is used for receiving casting slurry and guiding the casting slurry into the feeding port, and the discharging channel is used for receiving the casting slurry overflowing from the discharging port, so that the casting slurry is in a flowing state at any position in the mold cavity during the casting process.
[0008] Preferably, the injection mold further comprises a casting assembly which is detachably connected with the cover plate, the casting assembly comprises a base body and a feeding nozzle and a pulling mechanism arranged on the base body; When the mold is closed, the casting assembly is close to the movable mold, so that the feeding nozzle is in communication with the feeding channel to inject casting slurry into the feeding channel; when the mold is opened, the casting assembly is away from the movable mold; The pulling mechanism comprises a plurality of pulling pins, the tail of the pulling pin has a diameter smaller than the diameter of the opening of the feeding channel and the discharging channel on the cover plate, the pulling pin has an extended state and a retracted state, when the mold is closed, the pulling pin is in the extended state, so that the tails of the plurality of pulling pins respectively penetrate into the feeding channel and the discharging channel; When the mold is opened, the pulling pin is in the retracted state, so that the tail of the pulling pin is separated from the rubber head attached thereto.
[0009] Preferably, the tail of the pulling pin has a connecting column, the diameter of one end of the connecting column away from the head of the pulling pin is greater than the diameter of one end of the connecting column close to the head of the pulling pin, so that the connecting column has a frustum structure.
[0010] Preferably, the pulling mechanism further comprises a blowing assembly arranged on the base body, the blowing assembly is linked with the movement state of the pulling pin, so that when the pulling pin is in the retracted state, a compressed gas flow is sprayed to the separation position of the rubber head and the pulling pin, so that the rubber head attached to the base body is separated from the base body.
[0011] Preferably, the blowing assembly comprises an air channel in communication with a gas source and a nozzle in communication with the air channel, the nozzle is located in the vicinity of the tail of the pulling pin, and the pulling pin closes the nozzle in the extended state and opens the nozzle in the retracted state; when the nozzle is opened, the compressed gas flow is sprayed towards the rubber head through the nozzle.
[0012] Preferably, the base body comprises a first plate body, a second plate body, a third plate body and a fourth plate body arranged in sequence in a stack, the fourth plate body is close to the moving die, and the first plate body is away from the moving die; The fourth plate body is fixedly arranged on the bottom wall of the second plate body, the third plate body is located between the fourth plate body and the second plate body, and the first plate body is fixedly connected with the third plate body; One end of the injection nozzle connected with the feeding system is located in a feeding hole on the first plate body, and an output end of the injection nozzle is located on the fourth plate body; The air passage and the spout are arranged on the fourth plate body, a head of the pulling pin is connected with the third plate body, and when the mold is opened or closed, the third plate body can relatively move a limited displacement relative to the fourth plate body, so that the pulling pin is in an extended state or a retracted state.
[0013] Preferably, the fourth plate body is provided with a hidden hole extending transversely and communicating with the air passage, the fourth plate body is further provided with a first through hole arranged perpendicularly crossing the hidden hole, an opening of the first through hole on a side of the fourth plate body facing the moving die forms the spout, and the pulling pin is arranged in the first through hole.
[0014] Preferably, the cover plate and the base body are connected through a plurality of first countersunk guide rods, the cover plate is provided with a plurality of first countersunk holes respectively matched with a countersunk end of each first countersunk guide rod, tail ends of the first countersunk guide rods are located in the second plate body after penetrating through the first countersunk holes, the first plate body is provided with a second countersunk hole, a first fastening pin is arranged in the second countersunk hole, the first fastening pin comprises a fastening segment close to a tail and a guide segment close to a head, the first fastening pin is fastened and connected with the tail end of the first countersunk guide rod through the fastening segment, and based on the guide segment, the first plate body can move along an axis direction of the guide segment relative to the second plate body.
[0015] Preferably, the first plate body, the second plate body and the cover plate are further provided with a second countersunk guide rod, a countersunk end of the second countersunk guide rod is fixedly connected with the first plate body, and a tail end of the second countersunk guide rod slides through the cover plate. The base is provided with a first positioning hole corresponding to the first countersunk guide rod and a second positioning hole corresponding to the second countersunk guide rod, when the mold is closed, the countersunk part of the first countersunk guide rod enters the first positioning hole, and the tail end of the second countersunk guide rod enters the second positioning hole.
[0016] Preferably, a flow distribution plate is further arranged on the cover plate, the feeding channel and the discharging channel are arranged on the flow distribution plate, a flow guide groove in communication with the feeding channel is further arranged on the flow distribution plate, and a sprue is arranged on the flow guide groove and used for docking with the injection nozzle.
[0017] Compared with the prior art, the injection mold provided by the technical scheme has the advantages that the high-temperature casting slurry flowing through the end of the mold cavity continues to flow to the discharging port and overflow after reaching the end, so that the continuous flow and high temperature of the melt in the end region are maintained. In this way, at the flow distribution and reflowing position, the fluid interface can be fully fused without being cooled too early in a local area, so that the generation of a fusion line (a weld line / cold joint) in the injection molding process is effectively avoided, thereby improving the yield and reliability of the injection molded product. In addition, the structure is an improvement at the mold level, and can be used with conventional injection machines, materials and process parameters without the need for special modification of the injection equipment, and has good universality and realizability. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 FIG. 1 is a perspective view of an injection mold in a mold clamped state according to an embodiment of the present application.
[0019] Figure 2 FIG. 2 is a perspective view of a fixed mold of the injection mold according to the embodiment of the present application.
[0020] Figure 3 FIG. 3 is a longitudinal sectional view of a movable mold according to the embodiment of the present application.
[0021] Figure 4 FIG. 4 is a perspective view of a movable mold body according to the embodiment of the present application.
[0022] Figure 5 FIG. 5 is a perspective view of the injection mold according to the embodiment of the present application, in which a casting assembly and a movable mold are in a separated state.
[0023] Figure 6 FIG. 6 is a perspective view of the injection mold according to the embodiment of the present application, in an open mold state.
[0024] Figure 7 FIG. 7 is a plan view of the injection mold according to the embodiment of the present application, in which a movable mold and a casting assembly are in a separated state.
[0025] Figure 8 FIG. 8 is an exploded view of the casting assembly according to the embodiment of the present application.
[0026] Figure 9 FIG. 9 is a perspective view of a material pulling pin according to the embodiment of the present application.
[0027] Figure 10 FIG. 10 is a sectional view along the direction C1. Figure 8
[0028] Figure 11 For Figure 8 A sectional view along the direction C2, wherein the pulling pin is in the extended state.
[0029] Figure 12 For Figure 8 A sectional view along the direction C2, wherein the pulling pin is in the retracted state.
[0030] Figure 13 A longitudinal sectional view of the connection between the moving die and the pouring assembly in the embodiment of the present application.
[0031] Figure 14 A perspective view of the first fastening pin in the embodiment of the present application.
[0032] Figure 15 A plan view of the flow distribution plate in the embodiment of the present application.
[0033] Figure 16 A perspective view of the rubber head in the embodiment of the present application.
[0034] Figure 17 A schematic view of the principle of forming a fusion line in the prior art. DETAILED DESCRIPTION
[0035] To make the technical content, structural features, achieved purposes and effects of the present application clear, the following will be described in detail in combination with the embodiments and the accompanying drawings.
[0036] The present embodiment discloses an injection mold for a plastic injection molding process, which is particularly suitable for injection molding products with holes or frame structures at the ends, and does not form a fusion line at the holes or frame structures at the ends.
[0037] For example, a plastic part has a hollow at each end, and the corresponding mold cavity structure and the flow of pouring slurry are as shown in Figure 17 The pouring slurry enters the mold cavity from the injection port H, then flows from both sides of the hole A, and then flows to the rear end after reflowing, in the process, since the pouring slurry is always flowing backward, no fusion line will appear at the reflowing position due to temperature reduction. When the pouring slurry flows to the hole B, the reflowing occurs again, in the process, the pouring slurry no longer flows after the hole B, and the injection of the slurry stops, therefore, a fusion line X will be formed at the reflowing position after the hole B, which will cause the product to be prone to cracking at the fusion line X.
[0038] To solve this problem, as shown in Figures 1 to 4The injection mold in the embodiment includes a fixed mold 1 and a movable mold 2. The fixed mold 1 includes a base 10 and a fixed mold body 11 arranged on the base 10, and the movable mold 2 includes a cover plate 20 and a movable mold body 21 arranged on the cover plate 20. When the molds are closed, the movable mold body 21 and the fixed mold body 11 jointly form a mold cavity.
[0039] The movable mold body 21 includes a feeding port 210 and a discharging port 211 communicating with the mold cavity, and the cover plate 20 is further provided with a feeding channel L1 corresponding to the feeding port 210 and a discharging channel L2 corresponding to the discharging port 211. The feeding channel L1 is used to receive the casting slurry and guide the casting slurry into the feeding port 210, and the discharging channel L2 is used to receive the casting slurry overflowing from the discharging port 211, so that the casting slurry is in a flowing state at any position in the mold cavity during the casting process.
[0040] For the injection mold with the above structure, the working principle is as follows: First, before injection molding, the fixed mold 1 and the movable mold 2 are closed under the action of the mold locking system, and the fixed mold body 11 is aligned with the movable mold body 21 to form a closed mold cavity.
[0041] Then, the injection molding machine injection system preheats the molding material to a molten state to form a casting slurry.
[0042] Next, the casting slurry is guided into the feeding port 210 through the feeding channel L1, and then guided into the mold cavity through the feeding port 210 to fill the mold cavity.
[0043] The casting slurry continuously flows in the mold cavity, and when it flows to the end, it reaches the discharging channel L2 through the discharging port 211 and overflows, ensuring that any position during the entire filling process is in a "flowing state".
[0044] Therefore, the injection mold provided by the above technical solution adds a discharging channel L2, so that the high-temperature casting slurry flowing through the end of the mold cavity continues to flow to the discharging port 211 and overflows after reaching the end, thereby maintaining the continuous flow and higher temperature of the melt in the end region. In this way, at the branch and recombination point, the melt is not cooled prematurely in a local area, and the fluid interface can be more fully fused, effectively avoiding the formation of fusion lines (weld lines / cold seams) during injection molding, thereby improving the yield and reliability of injection molded products. In addition, this structure is an improvement at the mold level, and can be used with conventional injection machines, materials, and process parameters without the need for special modifications to the injection equipment, and has good universality and realizability.
[0045] Furthermore, by directly solving the end local cooling and fusion line problem on the mold structure, the dependence on trial-and-error process parameters (such as repeatedly adjusting the mold temperature, injection speed, and pressure holding strategy) to alleviate the fusion line problem is reduced, thereby reducing the complexity and time cost of debugging.
[0046] On the other hand, asFigures 5 to 9 The mold structure further comprises a pouring assembly 3 detachably connected with the cover plate 20, the pouring assembly 3 comprising a base body 30 and a pouring nozzle 31 and a pulling mechanism arranged on the base body 30.
[0047] When the mold is closed, the pouring assembly 3 is close to the movable mold 2, so that the pouring nozzle 31 is in communication with the feeding channel L1 to inject the pouring slurry into the feeding channel L1.
[0048] When the mold is opened, the pouring assembly 3 is away from the movable mold 2.
[0049] The pulling mechanism comprises a plurality of pulling pins 320, the tail diameter of the pulling pins 320 is smaller than the caliber of the openings of the feeding channel L1 and the discharging channel L2 on the cover plate 20, the pulling pins 320 have an extended state and a retracted state, when the mold is closed, the pulling pins 320 are in the extended state, so that the tails of the plurality of pulling pins 320 respectively penetrate into the feeding channel L1 and the discharging channel L2.
[0050] When the mold is opened, the pulling pins 320 are in the retracted state, so that the tails of the pulling pins 320 are separated from the glue heads P attached thereto.
[0051] For the pouring assembly 3 described above, in the closed mold state, the plurality of (at least two) pulling pins 320 are in the extended state, and the tails thereof penetrate into the feeding channel L1 and the discharging channel L2 on the cover plate 20. That is, part of the pulling pins 320 penetrate into the feeding channel L1, and part of the pulling pins 320 penetrate into the discharging channel L2. At this time, the pouring nozzle 31 injects the pouring slurry in a molten state into the mold cavity through the feeding channel L1, the pouring slurry is cooled and solidified in the mold cavity to form a product, and the slurry in the feeding channel L1 and the discharging channel L2 is also solidified to form glue heads P, which are attached around the tails of the pulling pins 320.
[0052] In the mold opening workflow, the pouring assembly 3 is away from the movable mold 2, and the pulling pins 320 are separated from the feeding channel L1 and the discharging channel L2, so as to pull out the glue heads P in the feeding channel L1 and the discharging channel L2, as shown in Figure 7 Then, the pulling pins 320 enter the retracted state, so that the pulling pins 320 are separated from the glue heads P. As shown in Figure 16 The pulled-out glue heads P include glue heads P1 pulled out from the feeding channel L1 and glue heads P2 pulled out from the discharging channel L2.
[0053] For the pouring assembly 3 with the above structure, by arranging the pulling pins 320, the glue heads P in the feeding channel L1 and the discharging channel L2 can be automatically pulled out when the mold is opened, which effectively improves the injection efficiency.
[0054] On the other hand, the pulling mechanism further comprises a blowing assembly arranged on the base body 30, which is configured in linkage with the movement state of the pulling pin 320, so that when the pulling pin 320 is in the retracted state, a compressed air flow is sprayed to the separation position of the glue head P and the pulling pin 320, so that the glue head P attached to the base body 30 is separated from the base body 30.
[0055] In this embodiment, the blowing assembly is linked with the retracted state of the pulling pin 320, and sprays a compressed air flow to the separation position of the glue head P and the pulling pin 320, so that the high-pressure air flow acts on the glue head P to make it fall off the base body 30, thereby completing the automatic removal of the glue head P.
[0056] It should be noted that in the mold opening workflow, the timing of the pulling pin 320 from the extended state to the retracted state can occur before the moving die 2 and the fixed die 1 are separated, or after the moving die 2 and the fixed die 1 are separated.
[0057] Therefore, since the glue head P is separated by the pulling pin 320 and the blowing assembly built in the mold, no external mechanical hand is needed for grabbing, positioning and carrying, etc. Artificial or mechanical actions, eliminating the cycle time occupied by the mechanical hand taking action, thereby shortening the single injection molding cycle time, improving the production rhythm and capacity, improving the production efficiency, simplifying the equipment configuration of the production line, reducing the equipment complexity and related maintenance cost.
[0058] On the other hand, as Figure 9 The tail of the pulling pin 320 has a connecting column 3200, and the diameter of the end of the connecting column 3200 away from the head of the pulling pin 320 (i.e. the end close to the inside of the gate 221) is greater than the diameter of the end close to the head of the pulling pin 320, so that the connecting column 3200 has a circular truncated cone structure.
[0059] Specifically, the circular truncated cone structure of the connecting column 3200 has a diameter that gradually increases from the end close to the head of the pulling pin 320 to the end away from the head, forming a conical frustum geometric shape.
[0060] The diameter range of the circular truncated cone connecting column 3200 is designed to be smaller than the caliber of the gate 221, so as to ensure that the pulling pin 320 can smoothly enter the inside of the gate 221 in the extended state and not block the pulp into the gate 221.
[0061] Since the connecting column 3200 has a circular truncated cone structure, the larger diameter of the end away from the head can increase the contact area and embedding effect with the glue head P, thereby enhancing the adhesion between the glue head P and the connecting column 3200. At the same time, the small end (the end close to the head) of the circular truncated cone structure has a small diameter, so that the resistance between the connecting column 3200 and the glue head P is small when the connecting column 3200 is retracted, facilitating the separation of the connecting column 3200 from the glue head P.
[0062] On the other hand, asFigures 10 to 12 The blowing assembly comprises an air channel 3033 arranged in the base body 30 and connected to the air source, and a nozzle 3032 connected to the air channel 3033, the nozzle 3032 being located in the vicinity of the tail of the pulling pin 320, and the pulling pin 320 being in the extended state to close the nozzle 3032 and in the retracted state to open the nozzle 3032. When the nozzle 3032 is opened, the compressed air is sprayed towards the rubber head P through the nozzle 3032.
[0063] Specifically, the air channel 3033 is a circular channel embedded in the base body 30, for example, with a diameter of 2 mm, connected to an external compressed air valve. The opening of the nozzle 3032 faces the direction of the tail of the pulling pin 320.
[0064] When the pulling pin 320 is in the extended state, the tail cylinder of the pulling pin 320 blocks the nozzle 3032, forming a mechanical closure; when the pulling pin 320 is in the retracted state, the tail moves backward to expose the nozzle 3032, forming an air flow channel. The compressed air pressure can be set to 0.5 MPa to 1.0 MPa, and the flow rate is about 0.2 L / min, to ensure sufficient impact on the rubber head P without affecting the surface of the base body 30.
[0065] Therefore, the movement linkage of the blowing nozzle 3032 realizes the timing control of the air flow, avoiding unnecessary air leakage. The impact separation of the rubber head P is completed at the moment when the pulling pin 320 is retracted, improving the reliability of the rubber head P separation; since the air flow is only opened at the necessary time, the energy consumption of the air source is reduced.
[0066] The shape of the nozzle 3032 can be circular, oval or porous structure to adapt to different sizes of the rubber head P.
[0067] The control mode of the blowing assembly can be a solenoid valve or a proportional valve to realize more accurate flow and pressure regulation.
[0068] On the other hand, as Figure 6 and Figure 8 The base body 30 comprises a first plate body 300, a second plate body 301, a third plate body 302 and a fourth plate body 303 arranged in a stack. The fourth plate body 303 is close to the movable die 2, and the first plate body 300 is away from the movable die 2.
[0069] The fourth plate body 303 is fixedly arranged on the bottom wall of the second plate body 301, the third plate body 302 is located between the fourth plate body 303 and the second plate body 301, and the first plate body 300 is fixedly connected with the third plate body 302.
[0070] The end of the injection nozzle 31 connected to the feeding system is located in the feeding hole on the first plate body 300, and the output end of the injection nozzle 31 is located on the fourth plate body 303.
[0071] The air channel 3033 and the spout 3032 are arranged on the fourth plate body 303. The head of the pulling pin 320 is connected with the third plate body 302. When the mold is opened / closed, with the movement of the base body 30, the third plate body 302 can relatively move a limited displacement relative to the fourth plate body 303, so that the pulling pin 320 is in the extended state or the retracted state.
[0072] The working principle of the pouring assembly 3 in the embodiment is as follows: When the mold is closed, the driving mechanism drives the second plate body 301, the third plate body 302 and the fourth plate body 303 together to move towards the direction of the fixed mold 1 until the pouring nozzle 31 on the fourth plate body 303 reaches the position of the interface with the sprue 221. In this process, the pulling pin 320 is in the extended state, and when the fourth plate body 303 is in place, the tail of the pulling pin 320 is deep into the sprue 221 on the movable mold 2.
[0073] When the mold is opened, it includes two strokes. In the first stroke, the driving mechanism drives the second plate body 301, the third plate body 302 and the third plate body 302 together to move away from the fixed mold 1. When moving to the limit position of the first stroke, the second plate body 301 cannot continue to move. Then the second stroke starts, that is, the first plate body 300 drives the third plate body 302 to continue to move a limited displacement, so that a relative displacement is generated between the third plate body 302 and the fourth plate body 303. Based on the relative displacement, the third plate body 302 pulls the pulling pin 320 to move, so that the pulling pin 320 changes from the extended state to the retracted state.
[0074] Through the specific structure of the pouring assembly 3 in the embodiment, the state change of the pulling pin 320 is self-adaptive to the opening / closing action of the pouring assembly 3, which effectively improves the operation efficiency.
[0075] Further, as shown in Figure 8 , a groove 3010 is arranged in the second plate body 301, and the third plate body 302 is embedded in the groove 3010.
[0076] On the other hand, please refer to Figure 11 and Figure 12 , the fourth plate body 303 is provided with a hidden hole 3030 extending transversely and communicating with the air channel 3033, and the fourth plate body 303 is further provided with a first through hole 3031 arranged perpendicularly intersecting the hidden hole 3030, the opening of the first through hole 3031 on the side of the fourth plate body 303 facing the movable mold 2 forms the spout 3032, and the pulling pin 320 is arranged in the first through hole 3031.
[0077] In the embodiment, the dark hole 3030 and the first through hole 3031 intersect inside to form a cross-shaped passage, and the airflow enters the dark hole 3030 from the air duct 3033, turns into the first through hole 3031, and is released at the nozzle 3032. The pulling pin 320 is embedded in the first through hole 3031, and when it is extended, it blocks the nozzle 3032, and when it is retracted, it is exposed.
[0078] Therefore, by the dark hole 3030 and the first through hole 3031 arranged in cross, the external impurities are effectively prevented from entering the air path. The nozzle 3032 is located on the surface of the fourth plate body 303, which facilitates the airflow to directly act on the rubber head P. The coaxial arrangement of the pulling pin 320 and the nozzle 3032 ensures the accurate impact direction of the airflow; the overall structure reduces the arrangement space of the external pipeline, and improves the compactness of the mold.
[0079] On the other hand, as Figure 13 and Figure 14 The cover plate 20 and the base body 30 are connected by a plurality of first countersunk guide rods 33, the cover plate 20 is provided with a plurality of first countersunk holes 200 respectively matched with the countersunk ends of each first countersunk guide rod 33, and the tail ends of the first countersunk guide rods 33 are located in the second plate body 301 after passing through the first countersunk holes 200. The first plate body 300 is provided with a second countersunk hole 3000, and the first countersunk hole 3000 is provided with a first fastening pin 34, the first fastening pin 34 includes a fastening segment 340 close to the tail and a guide segment 341 close to the head, and the first fastening pin 34 is fastened and connected with the tail end of the first countersunk guide rod 33 through the fastening segment 340, and based on the guide segment 341, the first plate body 300 can move along the axis direction of the guide segment 341 relative to the second plate body 301.
[0080] The first fastening pin 34 in the embodiment is preferably a plug screw.
[0081] When the mold is closed, the first plate body 300 drives the second plate body 301 to move along the first direction F1 in the figure, the first plate body 300 and the second plate body 301 are attached together, the countersunk end of the first countersunk guide rod 33 exits the first countersunk hole 200, and at this time, there is a space K between the head of the first fastening pin 34 and the bottom wall of the second countersunk hole 3000, and part of the guide segment 341 of the first fastening pin 34 is located in the space K.
[0082] During the mold opening process, the first plate body 300 moves along the second direction F2 in the figure, and during the first stroke, the first plate body 300 applies a pulling force to the second plate body 301, the third plate body 302 and the fourth plate body 303. At this time, since the glue head P is attached to the tail of the pulling pin 320, although the head of the pulling pin 320 is subjected to the pulling force of the third plate body 302, since the first countersunk head guide rod 33 freely slides in the first countersunk head hole 200, the pulling force is relatively small, which is not enough to pull the pulling pin 320 to the retracted state, so there is still a space K between the head of the first fastening pin 34 and the second countersunk head hole 3000.
[0083] When the countersunk end of the first countersunk head guide rod 33 abuts against the first countersuk head hole 200 and cannot continue to move in the second direction F2, the second stroke is entered. At this time, since the second plate body 301 is fastened between the first countersunk head guide rod 33 and the first fastening pin 34, the second plate body 301 cannot continue to move either. With the gradually increasing pulling force applied by the driving mechanism to the first plate body 300 (it should be noted that the first plate body 300 is fixedly connected with the third plate body 302), the block of the glue head P to the pulling pin 320 is overcome, so that the first plate body 300 moves along the guide section 341 of the first fastening pin 34, until the bottom wall of the second countersuk head hole 3000 abuts against the head of the first fastening pin 34, and the second stroke reaches the limit position. At this time, the pulling pin 320 enters the retracted state.
[0084] Therefore, through the combination of the first countersuk head guide rod 33 and the first fastening pin 34, the limited displacement of the pouring assembly 3 in the axial direction can be realized, which meets the extension and retraction requirements of the pulling pin 320.
[0085] On the other hand, as Figure 2 and Figure 6 , the first plate body 300, the second plate body 301 and the cover plate 20 are further provided with a second countersuk head guide rod 35, the countersuk end of the second countersuk head guide rod 35 is fixedly connected with the first plate body 301, and the tail end of the second countersuk head guide rod 35 slides through the cover plate 20.
[0086] The base 10 is provided with a first positioning hole 100 corresponding to the first countersuk head guide rod 33 and a second positioning hole 101 corresponding to the second countersuk head guide rod 35. When the mold is closed, the head of the first countersuk head guide rod 33 enters the first positioning hole 100, and the tail of the second countersuk head guide rod 35 enters the second positioning hole 101.
[0087] In this embodiment, through the cooperation of the first countersuk head guide rod 33 and the first positioning hole 100, and the second countersuk head guide rod 35 and the second positioning hole 101, a double-guide-rod double-positioning structure is realized, which provides multi-point constraint of the upper and lower molds, and significantly improves the rigidity and positioning accuracy during the mold closing process.
[0088] On the other hand, asFigure 15 The cover plate 20 is further provided with a distribution plate 22, the feeding channel L1 and the discharging channel L2 are located on the distribution plate 22, the distribution plate 22 is further provided with a flow guide groove 221 in communication with the feeding channel L1, and the flow guide groove 221 is provided with a pouring gate 220 for docking with the injection nozzle 31.
[0089] In the embodiment, the distribution plate 22 is arranged on the cover plate 20, a plurality of movable mold bodies 21 are arranged on the cover plate 20, a plurality of feeding channels L1 and discharging channels L2 are arranged, the plurality of feeding channels L1 are respectively located at different positions of the flow guide groove 221, thereby being adapted to the multi-mold cavity structure, and a plurality of products can be injection molded at one time, for example, eight terminal shells can be injection molded at one time.
[0090] The above only shows the preferred embodiments of the present application, and of course cannot limit the scope of the present application, and thus the equivalent changes made according to the patent application scope of the present application still belong to the scope of the present application.
Claims
1. An injection mold characterized in that, The mold includes a fixed mold and a movable mold, the fixed mold includes a base and a fixed mold body arranged on the base, the movable mold includes a cover plate and a movable mold body arranged on the cover plate, and the movable mold body and the fixed mold body jointly form a mold cavity when the mold is closed; the movable mold body includes a feeding port and a discharging port which are in communication with the mold cavity, the cover plate is further provided with a feeding channel corresponding to the feeding port and a discharging channel corresponding to the discharging port, the feeding channel is used for receiving casting slurry and guiding the casting slurry into the feeding port, and the discharging channel is used for receiving the casting slurry overflowing from the discharging port, so that the casting slurry is in a flowing state at any position in the mold cavity during casting.
2. The injection mold of claim 1, wherein The mold further includes a casting assembly which is detachably connected with the cover plate, the casting assembly includes a base body and a feeding nozzle and a pulling mechanism arranged on the base body; When the mold is closed, the casting assembly is close to the movable mold, so that the feeding nozzle is in communication with the feeding channel to inject casting slurry into the feeding channel; when the mold is opened, the casting assembly is away from the movable mold; The pulling mechanism includes a plurality of pulling pins, the tail of the pulling pin has a diameter smaller than the diameter of the opening of the feeding channel and the discharging channel on the cover plate, the pulling pin has an extended state and a retracted state, when the mold is closed, the pulling pin is in the extended state, so that the tail of the pulling pin is respectively deep into the feeding channel and the discharging channel; When the mold is opened, the pulling pin is in the retracted state, so that the tail of the pulling pin is separated from the rubber head attached thereto.
3. The injection mold of claim 2, wherein, The tail of the pulling pin has a connecting column, the diameter of one end of the connecting column away from the head of the pulling pin is greater than the diameter of one end of the connecting column close to the head of the pulling pin, so that the connecting column has a frustum structure.
4. The injection mold of claim 2, wherein The pulling mechanism further includes a blowing assembly arranged on the base body, the blowing assembly is linked with the movement state of the pulling pin, so that when the pulling pin is in the retracted state, a compressed gas flow is sprayed to the separation position of the rubber head and the pulling pin, so that the rubber head attached to the base body is separated from the base body.
5. The injection mold of claim 4, wherein, The blowing assembly includes a gas channel in communication with a gas source and a nozzle in communication with the gas channel, the nozzle is located in the vicinity of the tail of the pulling pin, and the pulling pin closes the nozzle in the extended state and opens the nozzle in the retracted state; when the nozzle is opened, the compressed gas flow is sprayed towards the rubber head through the nozzle.
6. The injection mold of claim 5, wherein, The base body includes a first plate body, a second plate body, a third plate body and a fourth plate body which are arranged in a stacked manner, the fourth plate body is close to the movable mold, and the first plate body is away from the movable mold; The fourth plate body is fixedly arranged on the bottom wall of the second plate body, the third plate body is located between the fourth plate body and the second plate body, and the first plate body is fixedly connected with the third plate body; One end of the feeding nozzle connected with the feeding system is located in a feeding hole on the first plate body, and an output end of the feeding nozzle is located on the fourth plate body; The air passage and the spout are arranged on the fourth plate body; the head of the material pulling pin is connected with the third plate body; when the mold is opened / closed, the third plate body can relatively move a limited displacement relative to the fourth plate body, so that the material pulling pin is in an extended state or a retracted state.
7. The injection mold of claim 6, wherein The fourth plate body is arranged with a hidden hole extending transversely and communicating with the air passage, and is further arranged with a first through hole arranged perpendicularly crossing the hidden hole; the opening of the first through hole on the side of the fourth plate body facing the movable mold forms the spout, and the material pulling pin is arranged in the first through hole.
8. The injection mold of claim 6, wherein, The cover plate and the base body are connected through a plurality of first countersunk guide rods, the cover plate is arranged with a plurality of first countersunk holes respectively matched with the countersunk end of each first countersunk guide rod, and the tail end of the first countersunk guide rod is located in the second plate body after penetrating through the first countersunk hole; the first plate body is arranged with a second countersunk hole, the second countersunk hole is arranged with a first fastening pin, the first fastening pin includes a fastening segment close to the tail and a guide segment close to the head, the first fastening pin is fastened and connected with the tail end of the first countersunk guide rod through the fastening segment, and based on the guide segment, the first plate body can move along the axis direction of the guide segment relative to the second plate body.
9. The injection mold of claim 8, wherein, The first plate body, the second plate body and the cover plate are further arranged with a second countersunk guide rod, the countersunk end of the second countersunk guide rod is fixedly connected with the first plate body, and the tail end of the second countersunk guide rod slides through the cover plate. The base is arranged with a first positioning hole corresponding to the first countersunk guide rod and a second positioning hole corresponding to the second countersunk guide rod, when the mold is closed, the countersunk part of the first countersunk guide rod enters the first positioning hole, and the tail end of the second countersunk guide rod enters the second positioning hole.
10. The injection mold of claim 2, wherein, The cover plate is further arranged with a shunt plate, the feeding channel and the discharging channel are located on the shunt plate, the shunt plate is further arranged with a flow guide groove communicating with the feeding channel, the flow guide groove is arranged with a sprue, and the sprue is used for butt joint with the material injection nozzle. The cover plate is further arranged with a shunt plate, the feeding channel and the discharging channel are located on the shunt plate, the shunt plate is further arranged with a flow guide groove communicating with the feeding channel, the flow guide groove is arranged with a sprue, and the sprue is used for butt joint with the material injection nozzle.