A floating inclined core-pulling structure for moving molds in medium and large molds
By using a floating inclined core-pulling structure with a moving mold, and with the cooperation of nitrogen springs and inclined guide blocks, the demolding problem of special long-stroke undercuts inside medium and large injection molded parts is solved, achieving an efficient demolding process and improving the service life of the mold and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO KEXIN MOLD CO LTD
- Filing Date
- 2025-08-08
- Publication Date
- 2026-07-03
AI Technical Summary
Traditional molds often encounter difficulties in demolding at the special long-stroke undercut points inside medium and large injection molded parts. Traditional angled ejectors or sliders are unable to achieve multi-directional coordinated movement, leading to demolding failure.
The system employs a floating moving mold and inclined core-pulling structure, which includes a floating moving mold mechanism, a nitrogen spring, and an inclined guide block. The separation of the moving mold and the stripper plate is achieved through the dual force of the nitrogen spring, and the core-pulling action is completed in conjunction with the synchronous movement of the inclined guide block, thus avoiding interference.
It enables smooth demolding of medium and large molds, saves mold opening stroke, avoids product tearing and deformation, and improves the service life of molds.
Smart Images
Figure CN224446714U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mold technology, specifically to a floating inclined core-pulling structure for moving molds in medium and large molds. Background Technology
[0002] Injection molds are tools used for molding plastic products. Molten plastic is injected into the mold cavity by an injection molding machine, and after cooling and solidification, a plastic product with a specific shape is formed. Injection molds are widely used in the production of plastic products, especially in industrial manufacturing.
[0003] With the increasing development of molds today, and the growing demand for complex structural parts in industries such as automobiles and electronics, traditional structures can no longer meet the needs of molds in the new era. For medium and large injection molded parts with special long-stroke undercuts, which are usually located in deep cavities or multi-layer structures, traditional angled ejectors or sliders are difficult to achieve multi-directional coordinated movement, resulting in the undercuts not being able to completely detach from the mold core during demolding, causing the undercuts to fail to demold smoothly. Traditional sliders and angled ejector mechanisms are limited by the shape of the product and cannot meet the requirements.
[0004] Therefore, we propose a floating inclined core-pulling structure for medium and large molds to solve the above problems. Utility Model Content
[0005] (a) Technical problems to be solved
[0006] To address the shortcomings of existing technologies, this utility model provides a floating inclined core-pulling structure for medium and large-sized molds, which solves the problems mentioned in the background art.
[0007] (II) Technical Solution
[0008] To achieve the above objectives, this utility model specifically adopts the following technical solution:
[0009] A floating inclined core-pulling structure for a medium-to-large mold includes a moving mold plate and a fixed mold stripper plate. The moving mold plate is equipped with a floating mechanism on both outer walls, and the other end of the floating mechanism is fixedly connected to the fixed mold stripper plate. A core-pulling assembly is installed in the cavity of the moving mold plate.
[0010] The moving mold floating mechanism includes an outer trigger, an inner trigger, and a wedge block. The inner trigger and the outer trigger are slidably connected to each other. The wedge block is fixed on the moving mold plate, and contact blocks are movably engaged at both ends of the wedge block. Nitrogen springs are embedded at both ends of the contact blocks.
[0011] The core-pulling assembly includes a side core puller and an angled guide block, which are slidably connected to each other.
[0012] Furthermore, the outer trigger is fixed to the moving template, and the inner trigger is fixed to the fixed mold stripper plate.
[0013] Furthermore, the outer trigger is provided with a guide groove, and one end of the inner trigger slides in the guide groove.
[0014] Furthermore, the contact block is provided with a slot, and is movably engaged with the wedge block through the slot.
[0015] Furthermore, the contact block has countersunk holes at both ends, and the nitrogen spring is fixed in the countersunk holes.
[0016] Furthermore, the side core puller is fixed in the cavity of the moving template, and the inclined guide block is fixed on the fixed mold stripper plate.
[0017] Furthermore, the side core puller is provided with a sliding groove, and the inclined guide block is slidably connected to the side core puller through the sliding groove.
[0018] Furthermore, wear-resistant blocks are embedded in the side core, and the wear-resistant blocks are located on its surrounding side walls.
[0019] (III) Beneficial Effects
[0020] Compared with the prior art, this utility model provides a floating inclined core-pulling structure for medium and large molds, which has the following beneficial effects:
[0021] In this invention, the floating mechanism of the moving mold maintains a floating state in the initial stage of mold opening. When the moving mold moves backward, the locking mechanism pulls the moving mold, and under the dual force of the nitrogen spring, the moving mold and the stripper plate are separated, completing the floating of the moving mold. The inclined guide block is fixed on the stripper plate, and the side core puller moves synchronously with the moving mold along the preset path to pull out the product and achieve demolding. This structure adopts the moving mold floating and front mold pulling mode, so that the core pulling action can simultaneously complete the lateral separation and retraction, saving the mold opening stroke compared with the traditional structure and avoiding interference problems. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of this utility model;
[0023] Figure 2 This is a schematic diagram of the moving template part of this utility model;
[0024] Figure 3 This is a schematic diagram of the state before mold opening for this utility model;
[0025] Figure 4 This is an exploded view of the moving mold floating mechanism of this utility model;
[0026] Figure 5 This is an exploded view of the core-pulling assembly of this utility model.
[0027] In the diagram: 1. Moving mold plate; 2. Fixed mold stripper plate; 3. Moving mold floating mechanism; 31. Outer trigger; 32. Inner trigger; 33. Wedge block; 34. Contact block; 35. Nitrogen spring; 36. Guide groove; 37. Slot; 38. Countersunk hole; 4. Core pulling assembly; 41. Side core pulling; 42. Angled guide block; 43. Slide groove; 44. Wear-resistant block. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0029] Example
[0030] like Figures 1-5 As shown in the figure, an embodiment of the present invention proposes a floating inclined core-pulling structure for medium and large molds, including a moving mold plate 1 and a fixed mold stripper plate 2. The moving mold plate 1 is equipped with a moving mold floating mechanism 3 on both outer walls, and the other end of the moving mold floating mechanism 3 is fixedly connected to the fixed mold stripper plate 2. A core-pulling assembly 4 is installed in the cavity of the moving mold plate 1. The moving mold floating mechanism 3 is kept in a floating state in the initial stage of mold opening. When the moving mold moves backward, the clamping mechanism pulls the moving mold and the moving mold and the stripper plate are separated under the dual force of the nitrogen spring 35, thus completing the floating of the moving mold. The inclined guide block 42 is fixed on the stripper plate, and the side core-pulling 41 moves synchronously with the moving mold along the preset path to pull out the product and realize demolding. This structure adopts the moving mold floating and front mold pulling mode, so that the core-pulling action can simultaneously complete the lateral separation and retraction, which saves the mold opening stroke compared with the traditional structure and can avoid interference problems.
[0031] The moving mold floating mechanism 3 includes an outer trigger 31, an inner trigger 32, and a wedge block 33. The inner trigger 32 and the outer trigger 31 are slidably connected to each other. The wedge block 33 is fixed on the moving mold plate 1, and contact blocks 34 are movably engaged at both ends of the wedge block 33. Nitrogen springs 35 are embedded at both ends of the contact blocks 34.
[0032] The core-pulling assembly 4 includes a side core-pulling 41 and an inclined guide block 42, which are slidably connected to each other.
[0033] like Figure 3As shown, in some embodiments, the outer trigger 31 is fixed to the moving template 1, and the inner trigger 32 is fixed to the fixed mold stripper plate 2. After the mold completes the mold opening action, the moving mold and the stripper plate are separated by the combined action of the trigger pulling the moving mold and the nitrogen spring 35 (a new type of elastic component that uses high-pressure nitrogen as the working medium, which releases elastic force by compressing nitrogen to provide a stable ejection force or balancing force to ensure that the mold action is precise and controllable). This completes the floating of the moving mold, the inclined guide block 42 is fixed on the stripper plate, and the side core puller 41 moves synchronously with the moving mold along the preset path to pull out the product and achieve demolding.
[0034] like Figure 4 As shown, in some embodiments, the outer trigger 31 is provided with a guide groove 36, and one end of the inner trigger 32 slides in the guide groove 36. The guide groove 36 serves as a travel guide for the inner trigger 32, ensuring seamless cooperation between components, enabling precise positioning, and ensuring accurate mechanical movement.
[0035] like Figure 4 As shown, in some embodiments, the contact block 34 is provided with a slot 37, and is movably engaged with the wedge block 33 through the slot 37. The slot 37 serves as a travel guide for the contact block 34, ensuring the accuracy of mechanical movement.
[0036] like Figure 4 As shown, in some embodiments, the two ends of the contact block 34 are provided with countersunk holes 38, and the nitrogen spring 35 is fixed in the countersunk holes 38. The countersunk holes 38 are assembly structures used for the installation and fixing of the nitrogen spring 35.
[0037] like Figure 2 As shown, in some embodiments, the side core puller 41 is fixed in the cavity of the moving mold plate 1, and the inclined guide block 42 is fixed on the fixed mold stripper plate 2. When the moving mold moves backward, the side core puller 41 moves synchronously with the moving mold along a preset path to pull out the product and achieve demolding.
[0038] like Figure 5 As shown, in some embodiments, the side core puller 41 is provided with a groove 43, and the inclined guide block 42 is slidably connected to the side core puller 41 through the groove 43. The groove 43 generally refers to a groove with a specific shape and size, used to guide and support the movement of the sliding component.
[0039] like Figure 5 As shown, in some embodiments, the side core puller 41 is fitted with a wear-resistant block 44, and the wear-resistant block 44 is located on its surrounding sidewalls. The wear-resistant block 44 is made of a high-hardness and high-wear-resistant material. Its main function is to reduce the friction between the side core puller 41 and the cavity of the moving template 1 during the sliding process, and extend the service life of the mold.
[0040] In use, the floating mechanism 3 of the moving mold remains floating in the initial stage of mold opening. When the moving mold moves backward, the locking mechanism pulls the moving mold, and under the dual force of the nitrogen spring 35, the moving mold and the stripper plate are separated, completing the floating of the moving mold. The inclined guide block 42 is fixed on the stripper plate, and the side core puller 41 moves synchronously with the moving mold along the preset path to pull out the product and achieve demolding. This structure adopts the moving mold floating and front mold pulling modes, so that the core pulling action can simultaneously complete lateral separation and retraction. The moving mold floating design achieves ±5mm adaptive compensation of the core pulling component 4 in the Z-axis direction, effectively solving the jamming problem caused by machining errors or thermal deformation in traditional core pulling. This has been verified by mold flow analysis. The inclined core-pulling path perfectly matches the undercut contour of the product, and the demolding force is evenly distributed, effectively preventing product tearing and deformation. The timing coordination design of the floating mechanism and the inclined guide block 42 ensures that the core-pulling action is completed before the parting surface opens. Note that it is necessary to ensure that there is absolutely no undercut on the core-pulling forming surface, and all forming parts are provided with a draft angle of more than 1°. The core-pulling should not interfere with the product removal. The core-pulling stroke is designed based on the maximum undercut depth of the product plus a safety margin of 5mm. The measured stroke tolerance is controlled within ±0.1mm. The weight of the moving mold is calculated, a suitable nitrogen spring 35 is selected, and the core-pulling motion trajectory is simulated in UG software to verify that it has no spatial conflict with the ejection system.
[0041] In summary, the floating moving mold mechanism 3 maintains a floating state during the initial mold opening stage. When the moving mold moves backward, the locking mechanism pulls the moving mold, and under the dual force of the nitrogen spring 35, the moving mold and the stripper plate are separated, completing the floating of the moving mold. The inclined guide block 42 is fixed on the stripper plate, and the side core puller 41 moves synchronously with the moving mold along the preset path to pull out the product and achieve demolding. This structure adopts the floating moving mold and front mold pulling mode, so that the core pulling action can simultaneously complete the lateral separation and retraction, saving the mold opening stroke compared with the traditional structure and avoiding interference problems.
[0042] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A floating inclined core-pulling structure for a medium-to-large mold, comprising a moving mold plate (1) and a fixed mold stripper plate (2), characterized in that: The moving template (1) is equipped with a moving mold floating mechanism (3) on both outer walls, and the other end of the moving mold floating mechanism (3) is fixedly connected to the fixed mold stripper plate (2). The moving template (1) is equipped with a core-pulling assembly (4) in its cavity. The moving mold floating mechanism (3) includes an outer trigger (31), an inner trigger (32), and a wedge block (33). The inner trigger (32) and the outer trigger (31) are slidably connected to each other. The wedge block (33) is fixed on the moving mold plate (1), and the two ends of the wedge block (33) are movably engaged with contact blocks (34). Nitrogen springs (35) are embedded at both ends of the contact blocks (34). The core-pulling assembly (4) includes a side core-pulling component (41) and an inclined guide block (42), which are slidably connected to each other.
2. A structure for floating the moving die and inclined core pulling of a medium-large die as set forth in claim 1, characterized in that: The outer trigger (31) is fixed on the moving template (1), and the inner trigger (32) is fixed on the fixed mold stripper plate (2).
3. A floating core structure for a large or medium-sized mold according to claim 1, wherein: The outer trigger (31) is provided with a guide groove (36), and one end of the inner trigger (32) slides in the guide groove (36).
4. A floating core structure for a large or medium-sized mold according to claim 1, wherein: The contact block (34) is provided with a slot (37) and is movably engaged with the wedge block (33) through the slot (37).
5. The floating inclined core-pulling structure for moving molds in medium and large-sized molds according to claim 1, characterized in that: The contact block (34) has countersunk holes (38) at both ends, and the nitrogen spring (35) is fixed in the countersunk holes (38).
6. A floating core structure for a large or medium-sized mold according to claim 1, wherein: The side core puller (41) is fixed in the cavity of the moving template (1), and the inclined guide block (42) is fixed on the fixed mold stripper plate (2).
7. A floating core structure for a large or medium-sized mold according to claim 1, wherein: The side core puller (41) is provided with a sliding groove (43), and the inclined guide block (42) is slidably connected to the side core puller (41) through the sliding groove (43).
8. A structure for floating the moving die and angle core pulling of a medium-large die, according to claim 1, characterized in that: The side core (41) is fitted with a wear-resistant block (44), and the wear-resistant block (44) is located on its surrounding side walls.