Structure and method for preventing sticking of injection molded parts to a mold

Abstract

The application discloses a structure and method for preventing injection molding parts from sticking to a fixed mold, comprising a fixed mold unit and a movable mold unit, and an injection molding part arranged between the fixed mold unit and the movable mold unit; the fixed mold unit comprises a fixed mold plate, a shovel and a fixed mold wear plate; the shovel is fixed on the fixed mold plate, and the fixed mold wear plate is arranged on the shovel; the movable mold unit comprises a movable mold wear plate, a movable mold plate and a movable mold sliding block; the movable mold sliding block is fixed on the movable mold plate, and the movable mold wear plate is fixed on the movable mold sliding block; the fixed mold wear plate and the movable mold wear plate are matched and used for limiting the position of the movable mold sliding block. The structure provided by the application can keep the movable mold sliding block static for a certain time when the fixed mold is opened, realizes a time-delay effect, and makes the movable mold sliding block clamp the injection molding part, so that the injection molding part can be smoothly separated from the fixed mold insert and cracking of the injection molding part caused by sticking to the fixed mold is avoided.

Description

Technical Field

[0001] This invention belongs to the field of injection molding technology, and specifically relates to a structure and method for preventing injection molded parts from sticking to the fixing film. Background Technology

[0002] Many air conditioner parts require injection molding to manufacture. Injection molding involves heating and melting thermoplastic or thermosetting plastics using an injection molding machine, then injecting the melt into a mold cavity under high pressure. After cooling and solidification, the product is demolded. Its core steps include melting, injection, filling, cooling, and demolding.

[0003] During injection molding, when molten plastic under high temperature and pressure comes into contact with the mold cavity surface, factors such as cooling and shrinkage causing vacuum adhesion, mold surface roughness, and draft angle can lead to product sticking to the mold. This phenomenon not only makes product demolding difficult but also often causes defects such as scratches, deformation, and breakage, severely reducing product yield, increasing mold maintenance costs and production downtime, and hindering the improvement of production efficiency.

[0004] To solve the problem of mold sticking, the main methods used are spraying release agents and increasing the draft angle. However, these solutions have obvious limitations: traditional release agents have limited effectiveness, and excessive spraying can lead to quality problems such as bright spots on the product; simply relying on structural optimizations such as bevels and chamfers is still prone to causing mold sticking due to excessive adhesion or structural interference when dealing with soft materials or complex products with undercut structures. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a structure for preventing injection molded parts from sticking to the mold. It is used to solve the following technical problems: 1. Complex structural design; 2. Movement sequence and positioning reliability; 3. Ensure that the slider holds the injection molded part in place within the moving mold unit during mold opening; 4. Maintenance and upkeep of moving parts.

[0006] The present invention adopts the following technical solution.

[0007] The first aspect of the present invention provides a structure for preventing injection molded parts from sticking to the mold, comprising: Fixed mold unit and moving mold unit; the space between the fixed mold unit and the moving mold unit is used to set up the injection molded part; The fixed mold unit includes a fixed template, a shovel, and a fixed mold wear-resistant plate; the shovel is fixed on the fixed template, and the fixed mold wear-resistant plate is set on the shovel. The moving mold unit includes a moving mold wear-resistant plate, a moving mold template, and a moving mold slider; the moving mold slider is fixed on the moving mold template, and the moving mold wear-resistant plate is fixed on the moving mold slider; The fixed mold wear plate and the moving mold wear plate work together to limit the position of the moving mold slider within a set time during demolding.

[0008] Preferably, the fixed mold unit further includes a fixed mold insert; the moving mold unit further includes a moving mold insert; The fixed mold insert is fixed on the fixed template; the moving mold insert is fixed on the moving template.

[0009] Preferably, the injection molded part is disposed between the fixed mold insert and the moving mold insert.

[0010] Preferably, the injection molded part is partially surrounded by a passive mold slider.

[0011] Preferably, the fixed mold unit further includes inclined guide pillars and pressure blocks; the moving mold unit further includes inclined guide pillar holes; The inclined guide post is fixed to the fixed template by pressure blocks; the inclined guide post hole is set on the moving template.

[0012] Preferably, the moving mold unit further includes a slider pressure bar; The moving mold slider is fixed to the moving mold plate by the slider pressure bar.

[0013] Preferably, the middle part of the fixed mold wear plate is provided with a structure parallel to the separation direction of the moving mold unit and the fixed mold unit; the middle part of the moving mold wear plate that mates with the fixed mold wear plate is also provided with a structure parallel to the separation direction of the moving mold unit and the fixed mold unit.

[0014] A second aspect of the present invention provides an injection molding machine, comprising: The above-mentioned structure addresses the issue of injection molded parts sticking to the mold.

[0015] A third aspect of the present invention provides a demolding method employing the above-described structure, comprising: Injection molding machine performs injection molding to obtain injection molded parts; The moving mold unit retracts, and the fixed mold wear plate and the moving mold wear plate remain within a set distance, restricting the moving mold slider from moving. When the moving mold unit and the fixed mold unit exceed the specified distance, the moving mold slider moves to release the injection molded part; Complete the demolding of the injection molded part.

[0016] A fourth aspect of the present invention provides an air conditioner, including an injection-molded part manufactured using the above-described structure.

[0017] The fifth aspect of the present invention provides a terminal, including a processor and a storage medium; The storage medium is used to store instructions; The processor is used to perform the steps of the above method according to the instructions.

[0018] A sixth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the above-described method.

[0019] The beneficial effects of this invention are compared with those of the prior art: The structure provided by this invention allows the moving mold slider to remain stationary for a certain period of time during the opening of the moving and fixed molds, thus achieving a time delay effect. The moving mold slider holds the injection molded product in place, ensuring that the injection molded product can be smoothly detached from the fixed mold insert and preventing the injection molded product from sticking to the fixed mold and cracking. By utilizing the opening sequence of the moving and fixed molds and the movement sequence of the moving mold slider, the problem of products with deep ribs or complex shapes sticking to the fixed mold can be solved, thus avoiding damage to the injection molded products and improving the quality and pass rate of injection molded products.

[0020] Improve production efficiency and automation levels.

[0021] It adapts to complex product structures, is reliable, and is easy to maintain. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the first layer of the structure of the present invention; Figure 2 This is a cross-sectional view of the second layer of the structure of the present invention; The component names corresponding to the labels are shown below: 1. Angled guide post; 2. Pressure block; 3. First screw; 4. Spring; 5. Injection molded part; 6. Fixed template; 7. Second screw; 8. Shovel; 9. Fixed template wear-resistant plate; 10. Third screw; 11. Wear-resistant plate for moving mold; 12. Slider pressure bar; 13. Fourth screw; 14. Moving template; 15. Moving mold slider. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0024] The mold slider core-pulling delay structure is an important structure used in injection molds and other molds. Its function is to delay the slider core-pulling action during the mold opening process, so as to meet the demolding requirements of complex product structures and avoid damage to the product during demolding.

[0025] Example 1 like Figure 1-2 As shown, Embodiment 1 of the present invention provides a structure for preventing injection molded parts from sticking to the mold, comprising: Injection part 5, fixed mold unit, and moving mold unit are arranged between the fixed mold unit and the moving mold unit. During the mold opening process of injection part 5, the moving mold unit delays its movement to prevent the complex structure of injection part 5 from being damaged during demolding.

[0026] The fixed mold unit includes a fixed mold insert, an inclined guide post 1, a pressure block 2, a fixed template 6, a shovel 8, and a fixed mold wear-resistant plate 9.

[0027] The fixed mold insert is fixed on the fixed template 6; the inclined guide post 1 is fixed on the fixed template 6 through the pressure block 2; the shovel 8 is fixed on the fixed template 6; the fixed mold wear plate 9 is set on the shovel 8.

[0028] The moving mold unit includes a moving mold insert, an inclined guide post hole, a moving mold wear plate 11, a slider pressure strip 12, a moving mold plate 14, and a moving mold slider 15.

[0029] The moving mold insert is fixed on the moving template 14, and the inclined guide post hole is set on the moving template 14; the moving mold slider 15 is fixed on the moving template 14 by the slider pressure strip 12, and the moving mold wear plate 11 is fixed on the moving mold slider 15; the inclined guide post hole is used to cooperate with the inclined guide post 1, and the two are used to control the movement of the moving mold slider 15.

[0030] The injection molded part 5 is positioned between the fixed mold insert and the moving mold insert; and part of the injection molded part 5 is surrounded by the moving mold slider 15; before demolding, the fixed mold wear plate 9 and the moving mold wear plate 11 cooperate to limit the position of the moving mold slider 15; the shovel 8 cooperates with the moving mold slider 15 to restrict the movement of the moving mold slider 15.

[0031] The fixed mold wear plate 9 has a section in its middle that is parallel to the separation direction of the moving mold unit and the fixed mold unit; the moving mold wear plate 11 also has a section in its middle that is parallel to the separation direction of the moving mold unit and the fixed mold unit at the mating part with the fixed mold wear plate 9. The fixed mold wear plate 9 and the moving mold wear plate 11 work together to limit the position of the moving mold slider within a set time during demolding.

[0032] Example 2 like Figure 1-2 As shown, Embodiment 2 of the present invention provides a structure for preventing injection molded parts from sticking to the fixed mold, including: an injection molded part 5, a fixed mold unit, and a moving mold unit, wherein the injection molded part is disposed between the fixed mold unit and the moving mold unit. During the mold opening process of the injection molded part, the moving mold unit avoids damage to the complex structure of the injection molded part during demolding by delaying its movement.

[0033] The fixed mold unit includes a fixed mold insert, an inclined guide post 1, a pressure block 2, a first screw 3, a fixed mold plate 6, a second screw 7, a shovel 8, a fixed mold wear plate 9, and a third screw 10.

[0034] The fixed mold insert is fixed to the fixed mold plate 6 by screws, and the inclined guide post 1 is fixed to the fixed mold plate 6 by the pressure block 2 and screws 3; The shovel 8 is fixed to the fixed template 6 by the second screw 7. The fixed template wear plate 9 is fixed to the shovel 8 by the third screw 10.

[0035] The moving mold unit includes a moving mold insert, an inclined guide post hole, a moving mold wear plate 11, a slider pressure strip 12, a fourth screw 13, a moving mold plate 14, and a moving mold slider 15; The moving mold insert is fixed to the moving template 14 with screws; the inclined guide post hole is set on the moving template 14 for cooperating with the inclined guide post 1; the moving mold slider 15 is fixed to the moving template 14 by the slider pressure strip 12 through the fourth screw 13; the moving mold wear plate 11 is fixed to the moving mold slider 15 with screws 10.

[0036] The injection molded part 5 is positioned between the fixed mold insert and the moving mold insert; and part of the injection molded part 5 is surrounded by the moving mold slider 15; before demolding, the fixed mold wear plate 9 and the moving mold wear plate 11 cooperate to limit the position of the moving mold slider 15; the shovel 8 cooperates with the moving mold slider 15 to restrict the movement of the moving mold slider 15.

[0037] The fixed mold wear plate 9 has a section in its middle that is parallel to the separation direction of the moving mold unit and the fixed mold unit; the moving mold wear plate 11 also has a section in its middle that is parallel to the separation direction of the moving mold unit and the fixed mold unit at the mating part with the fixed mold wear plate 9. The fixed mold wear plate 9 and the moving mold wear plate 11 work together to limit the position of the moving mold slider within a set time during demolding.

[0038] Example 3 Embodiment 3 of the present invention provides a demolding method based on the structure of Embodiment 1 or 2, comprising: Injection molding machine performs injection molding to obtain injection molded parts; The moving mold unit retracts, and the fixed mold wear plate and the moving mold wear plate remain within a set distance, restricting the moving mold slider from moving. When the moving mold unit and the fixed mold unit exceed the specified distance, the moving mold slider moves to release the injection molded part; Complete the demolding of the injection molded part.

[0039] The injection molding machine injects the mold composed of the fixed mold insert and the moving mold insert. After the injection molding is completed and cooled, the injection molded part 5 is obtained. The product can be seen from the 3D and 2D drawings that the fixed mold unit has deep ribs. After the injection molding is completed, the fixed mold unit and the moving mold unit are pulled back by the injection molding machine, so that the moving mold unit and the fixed mold unit are separated, which is commonly known as mold opening.

[0040] Due to the special structure of injection molded parts (the ribs of the fixed mold unit are very deep), when the moving mold unit and the fixed mold unit separate, the fixed mold insert will stick to a part of the injection molded part. This will cause product damage during the separation process of the moving mold unit and the fixed mold unit, and a qualified product cannot be obtained.

[0041] To consistently obtain qualified injection molded parts, it is necessary to increase the adhesion of the moving mold unit. This ensures that when the moving and fixed mold units separate, the injection molded part remains firmly attached to the moving mold insert. Since the structure of the injection molded part cannot be altered, measures must be taken from the mold structure to increase the adhesion of the moving mold unit. Mold structure analysis revealed that a portion of the injection molded part is surrounded and held down by the moving mold slider. If the moving mold slider remains stationary when the moving and fixed mold units separate, it can firmly hold the product, increasing the adhesion of the moving mold unit and allowing the injection molded part to smoothly detach from the fixed mold insert, leaving the injection molded part on the moving mold insert. Then, ejection mechanisms such as ejector pins and angled ejectors detach the injection molded part from the moving mold insert, and a robotic arm removes it from the injection molding machine.

[0042] Because of the fixed mold guide pillars, the moving mold slider must remain stationary when the moving mold unit and the fixed mold unit separate. The guide pillar holes on the moving mold slider must be designed to allow for clearance, as a spring is installed underneath the moving mold slider. When the extruder leaves the moving mold slider, the slider will retract under the spring force. To prevent this retraction, a special mechanism is needed behind the moving mold slider, such as the special fixed mold wear plate 9 and moving mold wear plate 11 shown in the diagram. A 10mm straight surface is designed in both the fixed and moving mold wear plates, aligned with the direction of movement of the moving and fixed mold units. Within a 10mm separation distance between the moving and fixed mold units, the moving mold slider holds the injection molded part stationary. When the separation distance exceeds 10mm, the moving mold slider retracts and detaches from the injection molded part under the action of the guide pillars and spring. The injection molding machine's ejection mechanism activates, and the ejector pins and angled ejectors push the injection molded part away from the moving mold unit, where it is removed by the robotic arm.

[0043] 1. Precise matching of core parameters - Delay stroke calculation: Determine the delay distance based on the undercut depth and glue thickness of the injection molded part. It is necessary to ensure that when the slider is stationary during the delay stage, the injection molded part has sufficient rigidity or clearance space. Usually, a safety margin of 0.5-1mm needs to be reserved. It is necessary to ensure that the slider is stationary about 10mm before the moving mold opens, and the slider of the injection molded part is tightly pressed against the moving mold part.

[0044] In a preferred but non-limiting embodiment of the present invention, the delay distance is determined according to the undercut depth and glue thickness of the injection molded part. It is necessary to ensure that when the moving mold slider is stationary during the delay stage, the injection molded part has sufficient rigidity or clearance space. Typically, a safety margin of 0.5-1mm needs to be reserved.

[0045] 2. Delayed driving and positioning reliability Both rigid and elastic drives can be used together. The movement distance is limited by high-hardness fixed mold wear-resistant plates and moving mold wear-resistant plates, and the slider is driven by inclined guide pillars and springs.

[0046] In a preferred but non-limiting embodiment of the present invention, rigid drive is preferred because it offers better stability than elastic drive. Positioning mechanism to prevent movement: During the delay stage, the slider needs to be accurately positioned by means of a shovel, a wear-resistant plate for the fixed mold, a wear-resistant plate for the moving mold, and an inclined guide post, so as to avoid the slider moving prematurely or delayed due to mold vibration. The positioning surface needs to be treated with wear resistance (such as quenching to HRC50 or above).

[0047] 3. Strict avoidance of structural interference Spatial layout optimization: The delay components need to avoid ejector pins, runners, and other mold parts to ensure that the movement trajectories of each part do not intersect during mold opening and core pulling. The movement process can be pre-simulated using 3D simulation software.

[0048] 4. Wear resistance and heat dissipation guarantee Strengthening of vulnerable parts: Friction parts such as moving mold sliders, inclined guide pins and inclined guide pin holes should adopt a hardness difference design (e.g., SKD61 for sliders and S136 for guide plates) and have lubrication grooves to reduce wear. Strengthening of vulnerable parts: Wear-resistant plates for fixed molds and moving molds should be made of heat-treated hard materials and have lubrication grooves to reduce wear.

[0049] The core maintenance of the mold slider core-pulling delay structure is to prevent the timing of actions from becoming disordered and to slow down component wear. This requires regular inspection, cleaning, lubrication, and calibration of key components. Specific methods are as follows: 5. Long-term maintenance (quarterly / semi-annually) a. Comprehensive disassembly and overhaul: Thoroughly disassemble the delay assembly, clean all components, and inspect the wear and deformation of each part, paying particular attention to the bending degree and surface hardness of the inclined guide pillars (if the hardness decreases, re-quenching is required). b. Performance testing: After assembly, perform a no-mold trial molding to simulate the entire process of mold opening and core pulling. c. Replacement of vulnerable parts: Replace the wear-resistant plates for the fixed mold and moving mold, springs, and lubricating grease to prevent sudden failures caused by the failure of vulnerable parts.

[0050] Example 4 Embodiment 4 of the present invention provides an injection molding apparatus, which includes the structure of Embodiment 1 or 2.

[0051] Example 5 Embodiment 5 of the present invention provides an air conditioner, including an injection-molded part manufactured using the structure of Embodiment 1 or 2.

[0052] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0053] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0054] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0055] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A structure for preventing injection molded parts from sticking to the mold, characterized in that, include: Fixed mold unit and moving mold unit; the space between the fixed mold unit and the moving mold unit is used to set the injection molded part (5); The fixed mold unit includes a fixed mold plate (6), a shovel (8), and a fixed mold wear plate (9); the shovel (8) is fixed on the fixed mold plate (6), and the fixed mold wear plate (9) is set on the shovel (8); The moving mold unit includes a moving mold wear plate (11), a moving mold plate (14), and a moving mold slider (15); the moving mold slider (15) is fixed on the moving mold plate (14), and the moving mold wear plate (11) is fixed on the moving mold slider (15); The fixed mold wear plate (9) and the moving mold wear plate (11) work together to limit the position of the moving mold slider (15) within a set time during demolding.

2. The structure for preventing injection molded parts from sticking to the mold according to claim 1, characterized in that: The fixed mold unit also includes a fixed mold insert; the moving mold unit also includes a moving mold insert; The fixed mold insert is fixed on the fixed template (6); the moving mold insert is fixed on the moving template (14).

3. The structure for preventing injection molded parts from sticking to the mold according to claim 2, characterized in that: The injection molded part (5) is placed between the fixed mold insert and the moving mold insert.

4. The structure for preventing injection molded parts from sticking to the mold according to claim 3, characterized in that: The injection part (5) is partially surrounded by the passive mold slider (15).

5. The structure for preventing injection molded parts from sticking to the mold according to claim 1, characterized in that: The fixed mold unit also includes an inclined guide post (1) and a pressure block (2); the moving mold unit also includes an inclined guide post hole; The inclined guide post (1) is fixed on the fixed template (6) by the pressure block (2); the inclined guide post hole is set on the moving template (14).

6. The structure for preventing injection molded parts from sticking to the mold according to claim 1, characterized in that: The moving mold unit also includes a slider pressure bar (12); The moving mold slider (15) is fixed on the moving mold plate (14) by the slider pressure bar (12).

7. The structure for preventing injection molded parts from sticking to the mold according to claim 1, characterized in that: The middle part of the fixed mold wear plate (9) is provided with a structure parallel to the separation direction of the moving mold unit and the fixed mold unit; the middle part of the moving mold wear plate (11) and the mating part of the fixed mold wear plate (9) are also provided with a structure parallel to the separation direction of the moving mold unit and the fixed mold unit.

8. An injection molding machine, characterized in that, include: The structure for preventing injection molded parts from sticking to the mold as described in any one of claims 1-7.

9. A demolding method employing the structure described in any one of claims 1-7, characterized in that, include: Injection molding machine performs injection molding to obtain injection molded parts; The moving mold unit retracts, and the fixed mold wear plate and the moving mold wear plate remain within a set distance, restricting the moving mold slider from moving. When the moving mold unit and the fixed mold unit exceed the specified distance, the moving mold slider moves to release the injection molded part; Complete the demolding of the injection molded part.

10. An air conditioner, characterized in that: Including injection molded parts manufactured using the structure described in any one of claims 1-7.

11. A terminal, comprising a processor and a storage medium; characterized in that: The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to claim 9.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method of claim 9.

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