Small-diameter special-shaped tubular plastic part injection mold convenient for core pulling
By combining irregular cores, clamping cores, and non-irregular cores, the problem of core extraction for small-diameter irregular tubular plastic parts is solved, enabling smooth extraction of irregular structures and avoiding damage to the cores and plastic parts. It is suitable for injection molds with small radial dimensions.
Patent Information
- Application Number
- CN202422908103.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Existing technologies are insufficient to effectively extract irregularly shaped structures with protrusions or grooves on the inner wall of tubular plastic parts with small radial dimensions, especially small-diameter irregularly shaped tubular plastic parts, as this can easily damage the core or plastic parts.
The design employs a combination of irregular cores, clamping cores, and non-irregular cores. By utilizing the contact between the clamping core and the non-irregular core, the irregular core moves radially after the first core pulling, completing the second core pulling. This avoids setting up elastic structures on cores with small radial dimensions.
It enables smooth core pulling of small-diameter irregularly shaped tubular plastic parts, avoiding damage to the core and plastic parts, and is suitable for injection molding operations with small radial dimensions.
Smart Images
Figure CN223545661U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to an injection mold for tubular plastic parts, and more particularly to an injection mold for small-diameter irregularly shaped tubular plastic parts that facilitates core pulling. Background Technology
[0002] Tubular plastic products have a wide range of applications, and their production generally employs injection molding. The mold used is the injection mold for tubular plastic parts. The basic structure of an injection mold for tubular plastic parts includes an upper mold plate, a lower mold plate, and a core. The space between the lower part of the upper mold plate and the upper part of the lower mold plate forms the mold cavity. The core is placed inside and positioned within the mold cavity. Liquid plastic is injected between the core and the cavity wall, and after it solidifies, the tubular plastic part is obtained. During disassembly, the process of pulling the core out of the hole in the tubular plastic part is called core pulling.
[0003] When the inner wall of a tubular plastic part does not have irregular structures such as protrusions, grooves, or radial holes, the core-pulling process is easy to complete, and the core can be pulled out directly. However, when the inner wall of a tubular plastic part has irregular structures such as protrusions, grooves, or radial holes, it is difficult to pull out the core directly because the outer wall of the core has corresponding grooves or protrusions that cooperate with the irregular structure of the inner wall of the tubular plastic part.
[0004] To solve the above problems, the traditional method is to set an elastic structure on the core at the position corresponding to the irregular structure on the inner wall of the tubular plastic part. When pulling the core, the elasticity is used to make the structure in this part automatically retract to avoid the irregular structure on the inner wall of the tubular plastic part, thereby completing the core pulling.
[0005] The aforementioned traditional method has the following drawbacks: For tubular plastic parts with large radial dimensions, the radial dimension of the core is also large, so there is sufficient space to set up an elastic structure. However, for tubular plastic parts with small or very small radial dimensions, the radial dimension of the core is also small or very small, making it very difficult to set up an elastic structure on the core. In such cases, it is difficult to directly complete the core pulling process. For example... Figure 1 The small-diameter irregular tubular plastic part 3 shown has a protrusion 1 on the wall of its through hole 2. Correspondingly, processing this small-diameter irregular tubular plastic part 3 requires a core with a groove at a corresponding position on the outer wall. When pulling the core, the protrusion 1 is placed in the groove on the core and they cooperate with each other, making it difficult to pull the core out directly. Even if it is forcibly pulled out, the protrusion 1 of the small-diameter irregular tubular plastic part 3 or the core is easily damaged. Especially for small-diameter irregular tubular plastic parts 3 with high hardness, it is even more difficult to complete the core pulling by traditional cores and traditional core pulling methods. Utility Model Content
[0006] The purpose of this invention is to provide an injection mold for small-diameter irregularly shaped tubular plastic parts that facilitates core pulling in order to solve the above-mentioned problems.
[0007] This utility model achieves the above objectives through the following technical solutions:
[0008] An injection mold for small-diameter irregularly shaped tubular plastic parts, facilitating core extraction, includes an upper mold plate, a lower mold plate, a core, and a core mounting component. The upper mold plate is located above the lower mold plate, and the two together form a mold cavity. The core is placed inside the mold cavity and connected to the core mounting component located on the outer side of one end of the upper and lower mold plates. The core includes an irregularly shaped core, a clamping core, and multiple non-irregularly shaped cores. The first end of the clamping core and the first end of each of the non-irregularly shaped cores are respectively connected to the core mounting component. Position D is defined as the position where the clamping core and the corresponding end of each non-irregularly shaped core meet near their first ends and the mold cavity. The outer wall of the non-shaped core has no irregular structure at any position between the second end and position D. The irregular core is completely placed inside the mold cavity, and its first end contacts the second end of the clamping core. The clamping core and the non-shaped core, the irregular core and the non-shaped core, and two adjacent non-shaped cores are in contact through a plane or arc surface. The outer wall of the irregular core has the irregular structure, which includes one or more of the following: groove, protrusion, and shape whose outer diameter near the second end is larger than the outer diameter near the first end. Note: The names of the irregular core, clamping core, and non-irregular core are only for distinguishing the components. The names themselves do not limit the structure of the components. Their structures are limited by relevant limiting conditions. The first end of the irregular core, clamping core, and non-irregular core are all the same end.
[0009] Preferably, to meet application requirements, the non-irregular core includes a tubular core and a rod-shaped core. The rod-shaped core passes through the central through hole of the tubular core and the second end of the rod-shaped core is placed outside the tubular core. A strip-shaped groove is provided on the outer circumferential wall of the tubular core, and both the clamping core and the irregular core are placed in the strip-shaped groove.
[0010] Preferably, for ease of processing, assembly and application, the core mounting component includes a core mounting plate and a sliding seat. One side of the core mounting plate is close to the upper template and the lower template, and the other side of the core mounting plate is connected to the sliding seat by screws. The core mounting plate is provided with a mounting through hole, and the diameter of the end of the mounting through hole near the sliding seat is increased to form a mounting groove. The core passes through the mounting through hole near its first end, and the outer diameter of the first end of the core is increased and placed in the mounting groove.
[0011] The beneficial effects of this utility model are as follows:
[0012] This invention utilizes a design that incorporates a non-irregularly shaped core, a clamping core, and a non-irregularly shaped core that work together. The clamping core and the non-irregularly shaped core, lacking irregular structures, facilitate direct extraction after injection molding. The non-connecting contact structure between the irregularly shaped core and the clamping core allows for smooth installation of the irregularly shaped core without requiring its removal during the initial core extraction. After the clamping core and the non-irregularly shaped core are removed initially, the irregularly shaped core can move radially and then be smoothly extracted, achieving a secondary core extraction process. This design ensures smooth core extraction without requiring elastic structures on cores with small radial dimensions, facilitating processing, assembly, and application. It is particularly suitable for injection molding of small-diameter irregularly shaped tubular plastic parts. Attached Figure Description
[0013] Figure 1 This is a front sectional view of a small-diameter, irregularly shaped tubular plastic part.
[0014] Figure 2 This is a perspective view of the injection mold for small-diameter irregularly shaped tubular plastic parts, which is easy to pull out the core, after the upper template has been removed during use.
[0015] Figure 3 This is a top view of the injection mold for small-diameter irregularly shaped tubular plastic parts, which is easy to pull out the core, after the upper template has been removed during use.
[0016] Figure 4 yes Figure 3 AA section view in the middle;
[0017] Figure 5 This is a perspective view of the injection mold for small-diameter irregularly shaped tubular plastic parts, which is easy to pull out, before core assembly. Detailed Implementation
[0018] The present invention will be further described below with reference to the accompanying drawings:
[0019] like Figures 2-5As shown, the injection mold for small-diameter irregular tubular plastic parts that facilitates core pulling according to this utility model includes an upper template (not shown in the figure for ease of displaying the internal structure, but easy to understand), a lower template 9, a core, and a core mounting component. The upper template is located above the lower template 9, and the two together form the mold cavity (not marked in the figure, i.e., the cavity where the small-diameter irregular tubular plastic part 3 is located). The core is placed inside the mold cavity, and the core is connected to the core mounting component located outside one end (left end in the figure) of the upper template and the lower template 9. The core includes an irregular core 8, a clamping core 6, and multiple non-irregular cores (refer to the tubular core 7 and rod core 10 below). The first end of the clamping core 6 (left end in the figure) and the first end of the non-irregular cores (left end in the figure) are respectively connected to the core mounting component, so that the clamping core 6 and the non-irregular core are close to their respective first ends. Position D is the location where one end intersects with the corresponding end of the mold cavity. The outer wall of the clamping core 6 at any position between its second end (right end in the figure) and position D has no irregular structure. Similarly, the outer wall of the non-irregular core at any position between its second end (right end in the figure) and position D also has no irregular structure. The irregular core 8 is completely placed inside the mold cavity, and its first end (left end in the figure) contacts the second end of the clamping core 6. The clamping core 6 and the non-irregular core, the irregular core 8 and the non-irregular core, and two adjacent non-irregular cores are in contact via planar or arc-shaped surfaces. The outer wall of the irregular core 8 is provided with the irregular structure, which includes one or more of the following: a groove, a protrusion, or a shape whose outer diameter near the second end is larger than the outer diameter near the first end. The irregular structure in the figure is a groove 13. Figure 1 The protrusions 1 on the hole walls of the through holes 2 of the small-diameter irregular tubular plastic parts 3 correspond to each other.
[0020] Preferably, to meet application requirements, the non-irregular core includes a tubular core 7 and a rod-shaped core 10. The rod-shaped core 10 passes through the central through hole of the tubular core 7, and the second end of the rod-shaped core 10 (the right end in the figure) is placed outside the tubular core 7. A strip-shaped groove 12 is provided on the outer circumferential wall of the tubular core 7, and the clamping core 6 and the irregular core 8 are both placed in the strip-shaped groove 12. To facilitate processing, assembly, and application, the core mounting component includes a core mounting plate 5 and a sliding seat 4. One side of the core mounting plate 5 is close to... The other side of the core mounting plate 5 and the sliding seat 4 are connected by screws 11 to the upper and lower templates 9. The core mounting plate 5 is provided with a mounting through hole (not marked in the figure), and the diameter of the end of the mounting through hole near the sliding seat 4 is increased to form a mounting groove (not marked in the figure). The core (the core here includes irregular core 8, clamping core 6, tubular core 7 and rod core 10) passes through the mounting through hole near the first end. The outer diameter of the first end of the core is increased and placed in the mounting groove.
[0021] like Figures 1-5 As shown, in use, the small-diameter irregular tubular plastic injection mold described in this utility model is first assembled according to the above structure and connected to the injection molding machine. The injection molding machine injects liquid plastic into the mold cavity through the injection hole on the upper or lower template 9 (not shown in the figure, which is a conventional structure). After solidification, a small-diameter irregular tubular plastic part 3 is formed. Then, the core pulling operation is performed as follows: First, the core 6, tubular core 7 and rod core 10 are pulled out together through the core mounting part to complete the first core pulling; then, the irregular core 8 is moved downward under its own weight, so that the groove 13 on the irregular core 8 is separated from the protrusion 1 on the small-diameter irregular tubular plastic part 3. Then, the irregular core 8 can be pulled out smoothly to complete the second core pulling, thus completing the entire core pulling process.
[0022] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.
Claims
1. An injection mold for small-diameter irregularly shaped tubular plastic parts that facilitates core pulling, comprising an upper mold plate, a lower mold plate, a core, and a core mounting component, wherein the upper mold plate is located above the lower mold plate and the two together form a mold cavity, the core is placed inside the mold cavity, and the core is connected to the core mounting component located on the outer side of one end of the upper mold plate and the lower mold plate, characterized in that: The core includes a shaped core, a clamping core, and multiple non-shaped cores. The first end of the clamping core and the first end of each of the non-shaped cores are respectively connected to the core mounting component. Position D is defined as the location on the clamping core where it meets the corresponding end of each non-shaped core near its first end and within the mold cavity. The outer wall of the clamping core at any position between its second end and position D has no irregular structure. The non-shaped cores at positions between their second ends and position D... The outer wall at any position does not have the aforementioned irregular structure. The irregular core is completely placed inside the mold cavity, and its first end is in contact with the second end of the clamping core. The clamping core and the non-irregular core, the irregular core and the non-irregular core, and two adjacent non-irregular cores are in contact through a plane or an arc surface, respectively. The outer wall of the irregular core is provided with the irregular structure, which includes one or more of the following: groove, protrusion, and shape whose outer diameter near the second end is larger than the outer diameter near the first end.
2. The injection mold for small-diameter irregularly shaped tubular plastic parts that facilitates core pulling according to claim 1, characterized in that: The non-irregular core includes a tubular core and a rod-shaped core. The rod-shaped core passes through the central through hole of the tubular core and the second end of the rod-shaped core is placed outside the tubular core. The outer circumferential wall of the tubular core is provided with a strip-shaped groove. Both the clamping core and the irregular core are placed in the strip-shaped groove.
3. The injection mold for small-diameter irregularly shaped tubular plastic parts that facilitates core pulling according to claim 1 or 2, characterized in that: The core mounting component includes a core mounting plate and a sliding seat. One side of the core mounting plate is close to the upper template and the lower template, and the other side of the core mounting plate is connected to the sliding seat by screws. The core mounting plate is provided with a mounting through hole, and the diameter of the mounting through hole near the sliding seat is increased to form a mounting groove. The core passes through the mounting through hole near its first end, and the outer diameter of the first end of the core is increased and placed in the mounting groove.