Secondary core-pulling injection mold capable of guaranteeing coaxiality
By employing a secondary core-pulling design with coaxially arranged inserts, mating holes, and sliding inserts in the injection mold, the problem of shaft hole misalignment caused by insert wear is solved, thus ensuring coaxiality, extending mold life, and reducing production costs.
Patent Information
- Application Number
- CN202423087699.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-13
AI Technical Summary
The wear of the insert pins during demolding of existing injection molds causes the shaft hole to shift, resulting in a decrease in product yield, high maintenance difficulty and increased cost, and time-consuming and labor-intensive adjustment of the shaft hole size.
Two insert pins are coaxially arranged with the mating hole. The sliding insert is sleeved on the insert pin. The drive device realizes secondary core pulling to ensure the coaxiality of the insert pin and the mating hole. The sliding insert is also adjusted to meet the product requirements.
Ensuring the coaxiality of the product's pivot hole extends the mold's service life, reduces maintenance costs, improves product yield, facilitates product adjustment, and lowers production costs.
Smart Images
Figure CN223532925U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection mold technology, and in particular to a secondary core-pulling injection mold that ensures coaxiality. Background Technology
[0002] Currently, some injection molded products are equipped with pivot holes for mounting pivot components. In existing technology, the pivot holes are typically created by inserting a pin into each side of the mold core, with the ends of the pins touching the mold core. Because the pins have a small diameter and are easily deformed, there is a risk of deformation or misalignment of the pins when the product is injected. Therefore, engineers create mating holes in the mold core, with the ends of the two pins facing each other through these holes. This allows the ends of the two pins to be supported, preventing deformation or misalignment of the pins by the plastic material and ensuring the coaxiality of the pivot holes.
[0003] However, when the above-mentioned mold needs to be demolded, the insert pin is usually removed first before demolding. The insert pin is in direct contact with the mold core and template. Long-term use of the mold will cause wear on the insert pin, mold core, and template. The wear on the mold core and template will cause the insert pin to be misaligned, causing the pivot hole to shift, resulting in a decrease in product yield. Moreover, the diameter of the insert pin is small, and the diameter of the mounting hole of the mold core and template corresponding to the insert pin is also small. This greatly increases the difficulty of repairing the mounting hole of the mold core and template, making it difficult to repair. Only new mold cores and templates can be replaced, resulting in an increase in production costs.
[0004] In addition, if the size of the product's pivot hole needs to be adjusted, the template and mold core need to be adjusted, which is time-consuming and costly. Utility Model Content
[0005] The purpose of this utility model is to provide a secondary core-pulling injection mold that ensures coaxiality, aiming to solve or at least partially solve the shortcomings of the above-mentioned background technology. It can ensure the coaxiality of the product's pivot hole and guarantee the product yield, extend the service life of the mold and reduce maintenance costs, while facilitating adjustments for corresponding products.
[0006] This utility model provides a secondary core-pulling injection mold that ensures coaxiality, including an upper mold assembly and a lower mold assembly. A cavity for molding a product is provided between the upper and lower mold assemblies. The product has a through-hole, consisting of a first rotating hole and a second rotating hole. The lower mold assembly includes a lower mold plate and a lower mold core disposed on the lower mold plate. Two sliding seats are symmetrically arranged on the lower mold plate, and each sliding seat has a sliding insert. A pin is through-entered on the sliding insert, and the sliding insert is fitted onto the pin. A mating hole is through-entered on the lower mold core, and the pin is coaxially arranged with the mating hole. The sliding insert penetrates the sliding seat, with one end penetrating the lower mold plate and extending to the outer side wall of the lower mold plate. The other end of the sliding insert... One end of the insert penetrates the lower mold core and extends into the cavity. One end of the insert can extend into the cavity and mate with the mating hole. The other end of the insert protrudes from the outer wall of the lower mold plate and is connected to a drive device. The upper mold assembly is provided with an inclined guide post that mates with the slide seat. The upper mold assembly, lower mold core, insert, and slide insert together form the cavity, and the product is formed in the cavity. When the mold is closed, the opposite ends of the two inserts extend into the mating holes from both ends of the mating holes. Parts of the two inserts are respectively set in the first pivot hole and the second pivot hole. When the product is formed in the cavity, the axis of the mating hole coincides with the axis of the first pivot hole and the axis of the second pivot hole. When the mold is opened, the drive device drives the two inserts to move in opposite directions and detach from the product, and the slide seat drives the slide insert to detach from the product.
[0007] Furthermore, the sliding insert has a movable hole extending through it along the axis of the insert pin. The movable hole connects the outer wall of the lower template with the cavity, and the insert pin is slidably positioned in the movable hole.
[0008] Furthermore, the sliding inserts are slidably connected to the lower mold plate and the lower mold core, respectively, and the sliding inserts are fixedly connected to the sliding seat.
[0009] Furthermore, the lower template, slide seat, and lower mold core are respectively provided with a first through hole, a second through hole, and a third through hole corresponding to the slide insert. The slide insert is partially disposed in the second through hole, and the slide insert can slide on the first through hole and the third through hole.
[0010] Furthermore, the slide insert is provided with a mounting part, and the slide insert is mounted on the slide seat through the mounting part.
[0011] Furthermore, the mounting seat is recessed with a mounting groove that mates with the mounting part, and the mounting part is installed in the mounting groove.
[0012] Furthermore, the insert has a sliding part that is slidably disposed in the movable hole, a mating part that mates with the mating hole, and a first forming part that connects the sliding part and the mating part. The first forming part is used to form the rotating shaft hole.
[0013] Furthermore, the diameter of the sliding part is larger than the diameter of the first forming part.
[0014] Furthermore, a limiting hole is coaxially provided inside the movable hole. The diameter of the limiting hole is smaller than the diameter of the movable hole. A limiting surface is provided at the connection between the limiting hole and the movable hole. The limiting surface is used to limit the insert pin from excessively extending into the cavity.
[0015] Furthermore, a second molding part is provided at one end of the insert near the cavity, and the second molding part is used to mold the product.
[0016] This utility model provides a secondary core-pulling injection mold that ensures coaxiality. Through the coaxial arrangement of two insert pins and mating holes, the insert pins are supported within the mating holes, reducing the risk of deformation or misalignment of the insert pins due to the impact of the plastic material. Simultaneously, it ensures that the axes of the two insert pins always coincide, thus guaranteeing the coaxiality of the first and second pivot holes. Furthermore, by using a sliding insert fitted onto the insert pins, it eliminates the need for mold repair of the lower mold assembly during routine wear. Instead, it provides targeted compensation to the sliding insert, ensuring that the insert pins maintain their alignment with the mating holes. Coaxiality reduces mold maintenance costs and extends mold life. On the other hand, when the size of the pivot hole needs to be modified, the lower mold assembly does not need to be repaired. Instead, the slide inserts are modified to meet the product requirements, making it easier to adjust for the corresponding product and reducing production costs. Through the cooperation between the upper mold assembly and the slide seat, and the cooperation between the insert pin and the drive device, the insert pin and the slide insert are pulled out in sequence to achieve secondary core pulling. Thus, the simultaneous core pulling of the insert pin and the slide insert does not cause scratches on the product, thereby improving the product yield. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of a secondary core-pulling injection mold that ensures coaxiality in the mold-closed state according to the present invention.
[0018] Figure 2 for Figure 1 A magnified diagram of point A in the middle.
[0019] Figure 3 This is a schematic diagram of a secondary core-pulling injection mold for ensuring coaxiality after the first core-pulling operation, according to this utility model.
[0020] Figure 4 for Figure 3 A magnified diagram of point B in the middle.
[0021] Figure 5 This is a schematic diagram of a secondary core-pulling injection mold that ensures coaxiality after mold opening, according to this utility model.
[0022] Figure 6 for Figure 5 A magnified diagram of point C.
[0023] Figure 7 for Figure 5The diagram after the row inlay and pin are omitted.
[0024] Figure 8 for Figure 1 The diagram shows a row of inserts.
[0025] Figure 9 for Figure 8 A magnified diagram of point D in the middle.
[0026] Figure 10 for Figure 1 The diagram shows a pin setting.
[0027] Figure 11 This is a schematic diagram of the product of this utility model. Detailed Implementation
[0028] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.
[0029] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0030] The directional terms such as "up," "down," "left," "right," "front," "back," "top," and "bottom" (if present) used in the specification and claims of this utility model are defined according to the position of the structures in the drawings and the relative positions of the structures, and are only for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of directional terms should not limit the scope of protection claimed in this application.
[0031] Please see Figures 1-6 and Figure 11 A secondary core-pulling injection mold for ensuring coaxiality includes an upper mold assembly 10 and a lower mold assembly 20. A cavity 40 for molding a product 100 is provided between the upper mold assembly 10 and the lower mold assembly 20. The product 100 has a through-hole swivel hole 101, which consists of a first swivel hole 1011 and a second swivel hole 1012.
[0032] The lower mold assembly 20 includes a lower mold plate 21 and a lower mold core 22 disposed on the lower mold plate 21. Two sliding seats 23 are symmetrically arranged on the lower mold plate 21. Each sliding seat 23 is provided with a sliding insert 24. A pin 25 is disposed through the sliding insert 24 and is fitted onto the pin 25. A mating hole 2221 is provided through the lower mold core 22. The pin 25 is coaxially arranged with the mating hole 2221.
[0033] The slide insert 24 passes through the slide seat 23. One end of the slide insert 24 passes through the lower mold plate 21 and extends to the outer side wall of the lower mold plate 21. The other end of the slide insert 24 passes through the lower mold core 22 and extends to the cavity 40. One end of the insert pin 25 can extend into the cavity 40 and cooperate with the mating hole 2221. The other end of the insert pin 25 protrudes from the outer side wall of the lower mold plate 21 and is connected to the drive device 30.
[0034] The upper mold assembly 10 is provided with an inclined guide post 11 that cooperates with the slide seat 23.
[0035] The upper mold assembly 10, the lower mold core 22, the insert pin 25, and the sliding insert 24 together form the cavity 40, and the product 100 is formed in the cavity 40.
[0036] When the mold is closed, the opposite ends of the two insert pins 25 extend into the mating hole 2221 from both ends of the mating hole 2221, and parts of the two insert pins 25 are respectively set in the first pivot hole 1011 and the second pivot hole 1012. When the product 100 is formed in the cavity 40, the axis of the mating hole 2221 coincides with the axis of the first pivot hole 1011 and the axis of the second pivot hole 1012.
[0037] When the mold is opened, the drive device 30 drives the two insert pins 25 to move in opposite directions and separate from the product 100, completing the first core pulling. The slide seat 23 drives the slide insert 24 to separate from the product 100, completing the second core pulling.
[0038] The secondary core-pulling injection mold providing coaxiality in this embodiment uses two insert pins 25 and mating holes 2221, arranged coaxially, to ensure that the insert pins 25 are supported in the mating holes 2221. This reduces the risk of deformation or misalignment of the insert pins 25 by the plastic material, while ensuring that the axes of the two insert pins 25 always coincide, thus guaranteeing the coaxiality of the first pivot hole 1011 and the second pivot hole 1012. By using a sliding insert 24 fitted onto the insert pins 25, it is possible to compensate for wear on the lower mold assembly 20 and the sliding insert 24 during routine wear without requiring mold repair of the lower mold assembly 20. Instead, the sliding insert 24 is specifically designed to ensure proper alignment of the insert pins 25 with the mating holes 2221. 1. Maintaining coaxiality reduces mold maintenance costs and extends mold life. On the other hand, when the size of the pivot hole 101 needs to be modified for product 100, the lower mold assembly 20 does not need to be modified. Instead, the slide insert 24 is modified to meet the needs of product 100, making it easier to adjust for product 100 and reducing production costs. Through the cooperation between the upper mold assembly 10 and the slide seat 23, and the cooperation between the insert pin 25 and the drive device 30, the insert pin 25 and the slide insert 24 are pulled in sequence to achieve secondary core pulling. Thus, the simultaneous core pulling of the insert pin 25 and the slide insert 24 causes scratches on product 100, thereby improving product yield.
[0039] Please see Figure 2Furthermore, in this embodiment, a support portion 222 is provided on the lower mold core 22, and a mating hole 2221 is provided through the support portion 222. When the mold is closed, the two insert pins 25 are partially inserted into the mating hole 2221 from both ends facing each other, and the support portion 222 provides support for the insert pins 25.
[0040] Please see Figure 1 and Figure 8 The sliding insert 24 has a movable hole 241 extending through it along the axis of the insert 25. The movable hole 241 connects the outer wall of the lower template 21 and the cavity 40. The insert 25 is slidably disposed in the movable hole 241.
[0041] Please see Figure 3 and Figure 4 Meanwhile, the movable hole 241 facilitates the installation and removal of the insert pin 25. When pulling the insert pin 25, the drive device 30 drives the insert pin 25 to slide along the movable hole 241 in a direction away from the product 100, so that the insert pin 25 is removed from the product 100, and the first core pulling is completed.
[0042] Please see Figure 5 and Figure 6 The slide insert 24 is slidably connected to the lower mold plate 21 and the lower mold core 22, and is fixedly connected to the slide seat 23. When the slide insert 24 is pulled, the slide insert 24 moves away from the product 100 along with the slide seat 23, and one end of the slide insert 24 is separated from the product 100, completing the second core pulling.
[0043] Please see Figure 7 and Figure 8 Furthermore, the lower mold plate 21, the slide seat 23, and the lower mold core 22 are respectively provided with a first through hole 211, a second through hole 231, and a third through hole 221 corresponding to the slide insert 24. The slide insert 24 is partially disposed in the second through hole 231. The first through hole 211, the second through hole 231, and the third through hole 221 all extend along the extension direction of the axis of the insert pin 25. When the slide insert 24 is core-pulled, the slide insert 24 can slide on the first through hole 211 and the third through hole 221.
[0044] Furthermore, the sliding insert 24 is provided with a mounting portion 242, which is mounted on the sliding seat 23. The sliding seat 23 has a recessed mounting groove 232 that mates with the mounting portion 242, and the mounting portion 242 is installed in the mounting groove 232. The mounting groove 232 causes the mounting portion 242 to sink into the sliding seat 23, so that the surface of the mounting portion 242 is on the same plane as the side wall of the sliding seat 23, thus preventing the mounting portion 242 from colliding with the lower template 21 during the sliding of the sliding seat 23.
[0045] More specifically, the slide seat 23 is provided with a guide oblique hole 233 that cooperates with the oblique guide post 11, and the oblique guide post 11 can drive the slide seat 23 to slide back and forth on the lower template 21.
[0046] Please see Figure 1 , Figure 2 and Figure 10 The insert pin 25 has a sliding portion 252 slidably disposed in the movable hole 241, a mating portion 251 that mates with the mating hole 2221, and a first forming portion 253 connecting the sliding portion 252 and the mating portion 251. The first forming portion 253 is used to form the pivot hole 101. When the mold is closed, the first forming portion 253 of the insert pin 25 passes through the mating hole 2221, so that the support portion 222 supports the insert pin 25.
[0047] Furthermore, the diameter of the sliding portion 252 is larger than the diameter of the first molding portion 253. The larger diameter of the sliding portion 252 can enhance the strength of the insert 25 and reduce the risk of deformation or misalignment of the insert 25 by the rubber material. In addition, the diameter of the sliding portion 252 should be smaller than the diameter of the movable hole 241 to ensure that the insert 25 can be inserted into the movable hole 241.
[0048] Furthermore, the end of the sliding part 252 away from the first forming part 253 is connected to the driving device 30. The driving device 30 drives the insert pin 25 to slide back and forth along the movable hole 241.
[0049] More specifically, the drive device 30 is disposed on the outer side wall of the lower template 21, and the movable end of the drive device 30 is connected to the sliding part 252 of the insert pin 25. In this embodiment, the drive device 30 is a cylinder.
[0050] Please see Figure 1 , Figures 8-10 A limiting hole 2411 is coaxially disposed within the movable hole 241. The diameter of the limiting hole 2411 is smaller than the diameter of the movable hole 241. A limiting surface 2412 is disposed at the connection between the limiting hole 2411 and the movable hole 241. The limiting surface 2412 is used to limit the insert pin 25 from excessively extending into the cavity 40. The limiting surface 2412 can be a straight surface, an inclined surface, or a curved surface. In this embodiment, the limiting surface 2412 is a straight surface.
[0051] More specifically, if the diameter of the limiting hole 2411 is smaller than the diameter of the sliding part 252 but larger than the diameter of the first molding part 253 and the mating part 251, then the sliding part 252 cannot pass through the limiting hole 2411, while the first molding part 253 and the mating part 251 can both pass through the limiting hole 2411. When the insert pin 25 is fully inserted into the movable hole 241, the sliding part 252 abuts against the limiting surface 2412. During mold closing, the drive device 30 drives the insert pin 25 to slide along the movable hole 241 towards the mating hole 2221. When the sliding part 252 abuts against the limiting hole 2411, the drive device 30 stops working, and the insert pin 25 stops sliding.
[0052] Please see Figure 8 The slide insert 24 has a second molding part 243 protruding from one end near the cavity 40. The second molding part 243 is used to mold the product 100.
[0053] It should be noted that in this embodiment, the second molding part 243 participates in the molding of the product 100. It replaces part of the original structure in the lower mold core 22. This part of the structure makes the demolding of the product 100 more difficult and the product yield is lower. The second molding part 243 replaces this part of the structure and, together with the core pulling method of the slide insert 24, demolds the product 100, which greatly reduces the demolding difficulty and improves the product yield.
[0054] Please see Figures 1-6 When the secondary core-pulling injection mold for ensuring coaxiality provided in this embodiment is opened:
[0055] First, the drive device 30 drives the insert pin 25 to move away from the product 100 along the movable hole 241. The mating part 251 and the first forming part 253 are completely moved into the movable hole 241, so that the insert pin 25 is completely separated from the product 100, and the first core pulling is completed.
[0056] Then, the upper mold assembly 10 drives the slide seat 23 to move away from the product 100 via the inclined guide post 11. The slide insert 24 moves with the slide seat 23 and slides relative to the insert pin 25. The insert pin 25 remains stationary. The second forming part 243 moves completely into the third through hole 221, so that the slide insert 24 is completely separated from the product 100, completing the second core pulling.
[0057] Finally, product 100 was successfully demolded.
[0058] The advantages of the secondary core-pulling injection mold that ensures coaxiality provided in this embodiment include:
[0059] (1) Ensure the coaxiality of the product's rotating shaft hole and improve the product yield.
[0060] (2) Extend the service life of the mold and reduce maintenance costs.
[0061] (3) It facilitates adjustments to the corresponding products and reduces production costs.
[0062] (4) Secondary core pulling avoids product damage and improves product yield.
[0063] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. A secondary core-pulling injection mold for ensuring coaxiality, comprising an upper mold assembly (10) and a lower mold assembly (20), wherein a cavity (40) for molding a product (100) is provided between the upper mold assembly (10) and the lower mold assembly (20), the product (100) having a through-hole (101), the through-hole (101) being composed of a first through-hole (1011) and a second through-hole (1012), characterized in that, The lower mold assembly (20) includes a lower mold plate (21) and a lower mold core (22) disposed on the lower mold plate (21). Two sliding seats (23) are symmetrically arranged on the lower mold plate (21). Each sliding seat (23) is provided with a sliding insert (24). A pin (25) is disposed through the sliding insert (24). The sliding insert (24) is fitted onto the pin (25). A mating hole (2221) is provided through the lower mold core (22). The pin (25) is coaxially arranged with the mating hole (2221). The sliding insert (24) is disposed through the lower mold core (22). The slide seat (23) is inserted through the lower mold plate (21), one end of the slide insert (24) passes through the lower mold plate (21) and extends to the outer side wall of the lower mold plate (21), the other end of the slide insert (24) passes through the lower mold core (22) and extends to the cavity (40), one end of the insert pin (25) can extend into the cavity (40) and cooperate with the mating hole (2221), the other end of the insert pin (25) protrudes from the outer side wall of the lower mold plate (21) and is connected to the driving device (30), and the upper mold assembly (10) is provided with an inclined guide post that cooperates with the slide seat (23); The upper mold assembly (10), the lower mold core (22), the insert pin (25), and the sliding insert (24) together form the cavity (40), and the product (100) is formed in the cavity (40); When the mold is closed, the opposite ends of the two insert pins (25) extend into the mating hole (2221) from both ends of the mating hole (2221), and the parts of the two insert pins (25) are respectively set in the first pivot hole (1011) and the second pivot hole (1012); when the product (100) is formed in the cavity (40), the axis of the mating hole (2221) coincides with the axis of the first pivot hole (1011) and the axis of the second pivot hole (1012); when the mold is opened, the driving device (30) drives the two insert pins (25) to move in opposite directions and disengage from the product (100), and the slide seat (23) drives the slide insert (24) to disengage from the product (100).
2. The secondary core-pulling injection mold for ensuring coaxiality as described in claim 1, characterized in that, The insert (24) has a movable hole (241) extending along the axis of the insert (25). The movable hole (241) connects the outer wall of the lower template (21) with the cavity (40). The insert (25) is slidably disposed in the movable hole (241).
3. The secondary core-pulling injection mold for ensuring coaxiality as described in claim 1, characterized in that, The slide insert (24) is slidably connected to the lower template (21) and the lower mold core (22) respectively, and the slide insert (24) is fixedly connected to the slide seat (23).
4. The secondary core-pulling injection mold for ensuring coaxiality as described in claim 3, characterized in that, The lower template (21), the slide seat (23), and the lower mold core (22) are respectively provided with a first through hole (211), a second through hole (231), and a third through hole (221) corresponding to the slide insert (24). The slide insert (24) is partially disposed in the second through hole (231), and the slide insert (24) can slide on the first through hole (211) and the third through hole (221).
5. The secondary core-pulling injection mold for ensuring coaxiality as described in claim 4, characterized in that, The row insert (24) is provided with a mounting part (242), and the row insert (24) is mounted on the row seat (23) through the mounting part (242).
6. The secondary core-pulling injection mold for ensuring coaxiality as described in claim 5, characterized in that, The mounting base (23) is recessed with a mounting groove (232) that cooperates with the mounting part (242), and the mounting part (242) is installed in the mounting groove (232).
7. The secondary core-pulling injection mold for ensuring coaxiality as described in claim 2, characterized in that, The insert (25) has a sliding part (252) that is slidably disposed in the movable hole (241), a mating part (251) that mates with the mating hole (2221), and a first forming part (253) that connects the sliding part (252) and the mating part (251). The first forming part (253) is used to form the rotating shaft hole (101).
8. The secondary core-pulling injection mold for ensuring coaxiality as described in claim 7, characterized in that, The diameter of the sliding part (252) is larger than the diameter of the first forming part (253).
9. The secondary core-pulling injection mold for ensuring coaxiality as described in claim 8, characterized in that, A limiting hole (2411) is coaxially provided inside the movable hole (241). The diameter of the limiting hole (2411) is smaller than the diameter of the movable hole (241). A limiting surface (2412) is provided at the connection between the limiting hole (2411) and the movable hole (241). The limiting surface (2412) is used to limit the insert pin (25) from excessively extending into the cavity (40).
10. The secondary core-pulling injection mold for ensuring coaxiality as described in claim 1, characterized in that, The row insert (24) has a second molding part (243) protruding from one end near the cavity (40), and the second molding part (243) is used to mold the product (100).