Ingenuous mold demolding structure
By combining the inclined ejector and the straight ejector pin in the mold demolding structure, the problem of difficult demolding of the large undercut on the inside of the injection molded product is solved, achieving smooth demolding and mold versatility.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUIZHOU YAOYING PRECISION TECH CO LTD
- Filing Date
- 2025-05-29
- Publication Date
- 2026-04-24
AI Technical Summary
Due to the tight space inside the injection molded product, the large undercut is difficult to demold smoothly, especially since the bottom surface of the large undercut has a locking groove, making it difficult to demold successfully using the normal mold opening method.
The mold adopts a demolding structure, including a mold core and a demolding mechanism. The mold core is equipped with a core and a forming groove. The demolding mechanism consists of a first inclined ejector rod, a straight ejector rod, and a second inclined ejector rod. The normal demolding of the large undercut is achieved through the cooperation of the inclined ejector and the straight ejector.
It enables smooth demolding of the large inverted buckle on the inside of the product, avoids thin-wall cracks in the buckle groove, and the mold can adapt to the production needs of different models of products.
Smart Images
Figure CN224158805U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection molding, and in particular to injection molded products with insufficient space for side snap-fit demolding. Background Technology
[0002] like Figure 6 and Figure 7 The injection-molded product shown has multiple large undercuts 14 on its inner wall. Each undercut 14 has a larger end than the other, and its bottom surface has an arc-shaped locking groove 15. Because the large undercuts 14 are located inside the product, and because the gap between them and the inner wall is small, after injection molding, the large undercuts 14 on the inner side of the product will embed into the circumferential surface of the molded core, making demolding difficult. Furthermore, the locking groove 15 on the bottom surface of the large undercuts 14 requires demolding first, before the large undercuts 14 can be demolded. Due to the compact product space, the inner locking parts cannot be easily demolded using normal mold opening methods.
[0003] Therefore, this utility model provides an ingenious mold demolding structure to solve the problem that the inner fastening space of the product is too tight for demolding. Utility Model Content
[0004] To achieve the above objectives, this utility model adopts the following technical solution: an ingenious mold demolding structure, comprising:
[0005] The mold core is provided with a core, and the circumferential surface of the core is evenly spaced with lower forming grooves for forming the undercut. The bottom of the lower forming groove is provided with a snap-fit forming block at one end away from the center line of the core.
[0006] The demolding mechanism is evenly spaced around the center line of the core. Each demolding mechanism is provided with an upper forming groove for forming the upper part of the undercut. Each demolding mechanism includes a first inclined ejector rod, a straight ejector rod and a second inclined ejector rod.
[0007] The first inclined push rod includes a first rod and a first inclined push head disposed on the upper end of the first rod. The first rod is slidably disposed on the core. A first groove is provided on the lower end of the surface of the first inclined push head away from the center line of the core.
[0008] A straight push rod, the straight push rod including a second rod and a straight push head disposed on the upper end of the second rod, the second rod being slidably disposed on the core, and a second groove being formed on the lower end of the surface of the straight push head away from the center line of the core;
[0009] The second inclined push rod includes a third rod and a second inclined push head disposed on the upper end of the third rod. The third rod is slidably disposed on the core. A third groove is opened on the lower end of the surface of the second inclined push head away from the center line of the core. The first groove, the second groove, and the third groove are connected in a counterclockwise direction to form the upper forming groove.
[0010] When the mold is closed, the upper forming groove corresponds one-to-one with the lower forming groove, and the upper forming groove is connected to the upper end of the lower forming groove.
[0011] Preferably, the cross-section of the upper forming groove gradually decreases in a clockwise direction.
[0012] Preferably, the bottom of the lower forming groove is provided with an undercut forming block at one end away from the center line of the core. The undercut forming block and the snap-fit forming block are arranged in a counterclockwise direction. A first gap is provided between the snap-fit forming block and the undercut forming block, and a second gap is provided between the snap-fit forming block and the side wall of the lower forming groove.
[0013] Preferably, the inner wall of the first groove is provided with a through groove, the center line of the through groove is perpendicular to the center line of the core, and the upper surface of the inverted forming block is provided with a protrusion, the protrusion being located inside the through groove at one end away from the center line of the core.
[0014] Preferably, when the mold is closed, the first angled ejector, the straight ejector, the second angled ejector, the undercut forming block, the snap-fit forming block and the surface of the core away from the core centerline are coplanar, and the undercut forming block is located at the end of the first groove away from the core centerline.
[0015] Preferably, a positioning block is provided at one end of the bottom of the lower forming groove near the center line of the core, a first positioning groove is provided at the lower end of the second groove, a second positioning groove is provided at the lower end of the third groove, and the two ends of the positioning block are respectively disposed in the first positioning groove and the second positioning groove.
[0016] Preferably, the surface of the positioning block away from the core centerline is coplanar with the inner wall of the upper forming groove.
[0017] Preferably, the sliding directions of the first rod and the third rod are parallel to each other.
[0018] Preferably, the straight push rod further includes an insert and a pin, and the upper surface of the straight push head away from the center line of the core has a receiving groove, and the insert is detachably installed inside the receiving groove by means of the pin.
[0019] Preferably, both the through groove and the protrusion have semi-circular cross-sections.
[0020] The beneficial effects of this utility model are as follows: the snap-fit forming block forms a snap-fit groove on the lower surface of the undercut; the undercut forming block cooperates with the first groove to form the smaller end of the large undercut; the third groove and the lower forming groove form the larger end of the large undercut. The two ends of the large undercut on the inside of the product are ejected normally using an angled ejector method, and the middle of the large undercut is ejected using a straight ejector method, allowing the snap-fit groove on the product to be demolded normally. Then, the large undercut is rotated in a certain direction and the product is removed, achieving normal demolding of the large undercut. Attached Figure Description
[0021] The accompanying drawings further illustrate the present invention, but the embodiments in the drawings do not constitute any limitation on the present invention.
[0022] Figure 1 This is a schematic diagram of the mold demolding structure provided in an embodiment of the present invention;
[0023] Figure 2 This is a schematic diagram of the structure of a mold core provided in an embodiment of the present invention;
[0024] Figure 3 This is a schematic diagram of the demolding mechanism provided in an embodiment of the present invention;
[0025] Figure 4 for Figure 1 A magnified view of region A in the image;
[0026] Figure 5 for Figure 2 A magnified view of region B in the image;
[0027] Figure 6 This is a schematic diagram of the structure of an injection-molded product provided in an embodiment of the present invention;
[0028] Figure 7 for Figure 6 A magnified view of region C in the image;
[0029] Reference numerals in the attached drawings: 1: Mold core; 2: Core; 3: Demolding mechanism; 4: First angled ejector; 5: Straight ejector; 6: Second angled ejector; 7: Lower forming groove; 8: Undercut forming block; 9: Snap-in forming block; 10: Positioning block; 11: First groove; 12: Second groove; 13: Third groove; 14: Large undercut; 15: Snap-in groove. Detailed Implementation
[0030] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.
[0031] It should be noted that, in this utility model, unless otherwise stated, when an element is referred to as "connected to" or "set on" another element, it can be directly on the other element or may have an intervening element present simultaneously. The directional terms used, such as "upper" and "lower," generally refer to... Figure 1 The terms "up" and "down" are shown. "Inner" and "outer" refer to the inner and outer contours of a specific part. "Far" and "near" refer to the distance relative to a particular component.
[0032] like Figures 1-5 As shown in the figure, an embodiment of the present invention provides an ingenious mold demolding structure, comprising:
[0033] Mold core 1, the mold core 1 is provided with core 2, the circumferential surface of the core 2 is evenly spaced with lower forming grooves 7 for forming the undercut bottom, and the bottom of the lower forming groove 7 is provided with a snap-fit forming block 9 at one end away from the center line of the core 2.
[0034] Demolding mechanism 3, the demolding mechanism 3 is evenly spaced around the center line of the core 2 and each demolding mechanism 3 is provided with an upper forming groove for forming the upper part of the undercut, and each demolding mechanism 3 includes a first inclined ejector rod, a straight ejector rod and a second inclined ejector rod;
[0035] The first inclined push rod includes a first rod and a first inclined push head 4 disposed on the upper end of the first rod. The first rod is slidably disposed on the core 2. The lower end of the surface of the first inclined push head 4 away from the center line of the core 2 is provided with a first groove 11.
[0036] A straight push rod, the straight push rod includes a second rod and a straight push head 5 disposed on the upper end of the second rod, the second rod is slidably disposed on the core 2, and a second groove 12 is formed on the lower end of the surface of the straight push head 5 away from the center line of the core 2;
[0037] The second inclined push rod includes a third rod and a second inclined push head 6 disposed on the upper end of the third rod. The third rod is slidably disposed on the core 2. The lower end of the surface of the second inclined push head 6 away from the center line of the core 2 is provided with a third groove 13. The first groove 11, the second groove 12, and the third groove 13 are connected in a counterclockwise direction to form the upper forming groove.
[0038] When the mold is closed, the upper forming groove and the lower forming groove 7 correspond one-to-one and the upper forming groove is connected to the upper end of the lower forming groove 7.
[0039] The cross-section of the upper forming groove gradually decreases in a clockwise direction. The resulting large undercut 14 has one large and one small end.
[0040] An undercut forming block 8 is provided at the bottom of the lower forming groove 7, away from the center line of the core 2. The undercut forming block 8 and the snap-fit forming block 9 are arranged sequentially in a counterclockwise direction. A first gap is provided between the snap-fit forming block 9 and the undercut forming block 8, and a second gap is provided between the snap-fit forming block 9 and the side wall of the lower forming groove 7. The snap-fit forming block 9 is distributed separately. The snap-fit groove 15 is formed on the bottom surface of the large undercut 14 by the snap-fit forming block 9, and the smaller end of the large undercut 14 is formed by the undercut forming block 8.
[0041] The inner wall of the first groove 11 has a through groove, the center line of which is perpendicular to the center line of the core 2. The upper surface of the undercut block 8 has a protrusion, which is located inside the through groove at one end away from the center line of the core 2. The through groove forms a locking block with a semi-circular cross-section on the undercut surface, through which the undercut can be snapped and installed to other parts.
[0042] When the mold is closed, the first angled ejector 4, the straight ejector 5, the second angled ejector 6, the undercut forming block 8, and the snap-fit forming block 9 are coplanar with the surface of the core 2 away from the center line of the core 2. The undercut forming block 8 is located at the end of the first groove 11 away from the center line of the core 2. The snap-fit forming block 9 forms a snap-fit groove 15 on the lower surface of the undercut. The undercut forming block 8 and the first groove 11 cooperate to form the smaller end of the large undercut 14. The third groove 13 and the lower forming groove 7 form the larger end of the large undercut 14. The first angled ejector 4, the straight ejector 5, the second angled ejector 6, the undercut forming block 8, and the snap-fit forming block 9 are coplanar with the surface of the core 2 away from the center line of the core 2, which facilitates the positioning of the first angled ejector 4, the straight ejector 5, the second angled ejector 6, the undercut forming block 8, and the snap-fit forming block 9, and forms the thin wall of the product through the cavity of other mold cores 1.
[0043] A positioning block 10 is provided at one end of the bottom of the lower forming groove 7 near the center line of the core 2. A first positioning groove is provided at the lower end of the second groove 12, and a second positioning groove is provided at the lower end of the third groove 13. The two ends of the positioning block 10 are respectively located in the first positioning groove and the second positioning groove. The positioning block 10 positions the straight ejector head 5 and the second inclined ejector head 6 during mold closing.
[0044] The surface of the positioning block 10 away from the center line of the core 2 is coplanar with the inner wall of the upper forming groove. The positioning block 10 positions the straight ejector 5 and the second inclined ejector 6 during mold closing, ensuring that the first inclined ejector 4, the straight ejector 5 and the second inclined ejector 6 are precisely fitted into the forming groove of the core 2, and ensuring that the upper forming groove and the lower forming groove 7 are precisely aligned.
[0045] The sliding directions of the first rod and the third rod are parallel to each other. When the mold is opened, the first inclined ejector 4 and the second inclined ejector 6 will move upward synchronously to move away from the large undercut 14, ensuring that the large undercut 14 is subjected to uniform demolding force and avoiding cracks in the thin wall of the snap-fit groove 15.
[0046] The straight ejector also includes an insert and a pin. The upper surface of the straight ejector head 5 away from the center line of the core 2 has a receiving groove. The insert is detachably installed inside the receiving groove via the pin. After knocking out the pin, the insert can be replaced, allowing for the production of other product models without readjusting the mold.
[0047] Both the through groove and the protrusion have semi-circular cross-sections.
[0048] The working principle of this utility model is as follows: the large undercut 14 on the side of the product is ejected normally from the mold using an angled ejector. During mold opening, the first angled ejector 4 and the second angled ejector 6 move at an angle, moving directly above the center of the core 2. The middle of the large undercut 14 is ejected using a straight ejector. Then, the large undercut 14 is rotated in a certain direction (such as counterclockwise) to remove the product. It is currently in smooth mass production.
[0049] The technical features of the embodiments described above can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these should all be considered to be within the scope of this specification.
Claims
1. A clever mold demolding structure, characterized in that: include: The mold core is provided with a core, and the circumferential surface of the core is evenly spaced with lower forming grooves for forming the undercut. The bottom of the lower forming groove is provided with a snap-fit forming block at one end away from the center line of the core. The demolding mechanism is evenly spaced around the center line of the core. Each demolding mechanism is provided with an upper forming groove for forming the upper part of the undercut. Each demolding mechanism includes a first inclined ejector rod, a straight ejector rod and a second inclined ejector rod. The first inclined push rod includes a first rod and a first inclined push head disposed on the upper end of the first rod. The first rod is slidably disposed on the core. A first groove is provided on the lower end of the surface of the first inclined push head away from the center line of the core. A straight push rod, the straight push rod including a second rod and a straight push head disposed on the upper end of the second rod, the second rod being slidably disposed on the core, and a second groove being formed on the lower end of the surface of the straight push head away from the center line of the core; The second inclined push rod includes a third rod and a second inclined push head disposed on the upper end of the third rod. The third rod is slidably disposed on the core. The lower end of the surface of the second inclined push head away from the center line of the core is provided with a third groove. The first groove, the second groove, and the third groove are connected in a counterclockwise direction to form the upper forming groove. When the mold is closed, the upper forming groove corresponds one-to-one with the lower forming groove, and the upper forming groove is connected to the upper end of the lower forming groove.
2. The ingenious mold demolding structure according to claim 1, characterized in that: The cross-section of the upper forming groove gradually decreases in a clockwise direction.
3. The ingenious mold demolding structure according to claim 1, characterized in that: The bottom of the lower forming groove is provided with an undercut forming block at one end away from the center line of the core. The undercut forming block and the snap-on forming block are arranged in a counterclockwise direction. A first gap is provided between the snap-on forming block and the undercut forming block, and a second gap is provided between the snap-on forming block and the side wall of the lower forming groove.
4. The ingenious mold demolding structure according to claim 3, characterized in that: The inner wall of the first groove is provided with a through groove, the center line of the through groove is perpendicular to the center line of the core, and the upper surface of the inverted forming block is provided with a protrusion, which is located inside the through groove at one end away from the center line of the core.
5. The ingenious mold demolding structure according to claim 4, characterized in that: When the mold is closed, the first angled ejector, the straight ejector, the second angled ejector, the undercut forming block, the snap-fit forming block and the surface of the core away from the core center line are coplanar, and the undercut forming block is located at the end of the first groove away from the core center line.
6. The ingenious mold demolding structure according to claim 1, characterized in that: The bottom of the lower forming groove is provided with a positioning block at one end near the center line of the core. The lower end of the second groove is provided with a first positioning groove, and the lower end of the third groove is provided with a second positioning groove. The two ends of the positioning block are respectively located in the first positioning groove and the second positioning groove.
7. The ingenious mold demolding structure according to claim 6, characterized in that: The surface of the positioning block away from the core centerline is coplanar with the inner wall of the upper forming groove.
8. The ingenious mold demolding structure according to claim 1, characterized in that: The sliding directions of the first and third rods are parallel to each other.
9. The ingenious mold demolding structure according to claim 1, characterized in that: The straight push rod also includes an insert and a pin. The upper surface of the straight push head away from the center line of the core has a receiving groove. The insert is detachably installed inside the receiving groove by means of the pin.
10. The ingenious mold demolding structure according to claim 4, characterized in that: Both the through groove and the protrusion have semi-circular cross-sections.