Ejection mechanism and injection mold for inner side back-off product
By introducing angled ejector pins and delayed support structures into the injection mold, the problem of difficult demolding of products with internal undercuts was solved, achieving efficient undercut removal and product integrity protection.
Patent Information
- Application Number
- CN202520007108.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2035-01-03
AI Technical Summary
During the injection molding process, products with undercut inner sides are difficult to separate from the angled ejector pins, resulting in demolding difficulties, low yield, or even inability to demold.
The structure employs a slanted ejector rod and a delayed support structure, including a slanted ejector rod, a support block, and an elastic element. The support block abuts against the plane of the moving mold core under the action of the elastic element, and the undercut is stably supported and demolded through the limit pin and the inclined guide surface.
This technology enables smooth demolding of products with internal undercuts, improves injection molding yield, avoids damage to undercuts, and ensures product integrity.
Smart Images
Figure CN223604943U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to injection mold field, concretely relates to the ejection mechanism and injection mold of inside reverse buckle product. BACKGROUND
[0002] Injection mold is a tool for producing plastic products, and is also a tool for giving complete structure and accurate size to the molded plastic product. Injection molding is a processing method used in batch production of some complex-shaped parts. Specifically, after the heated and melted plastic is injected into the mold cavity through the screw of the injection molding machine, the shaped product is obtained after cooling and solidification.
[0003] In some products such as plastic covers, the inside reverse buckle is usually designed to realize the assembly and buckling of multiple parts. When such products are injection molded, the conventional inclined ejector rod is used for inclined ejection to realize demolding. However, after injection molding, the reverse buckle of the product is embedded on the inclined ejector rod and is not easy to separate, and the direct inclined ejection using the inclined ejector rod is easy to be damaged, thereby causing low yield and even demolding problems. SUMMARY
[0004] Therefore, the utility model provides an ejection mechanism and injection mold for inside reverse buckle product to solve the above problems.
[0005] To achieve the above purpose, the utility model provides the technical scheme as follows:
[0006] An ejection mechanism for inside reverse buckle product, comprising an inclined ejector rod and a delay support structure, the inclined ejector rod is inclined and arranged on a movable die core, the inclined ejector rod is provided with a molding surface for molding the inside reverse buckle, a receiving cavity, and a through hole passing through the receiving cavity to the molding surface; the delay support structure comprises a support block and an elastic member, the support block is assembled in the receiving cavity and can move in a direction perpendicular to the mold opening and closing; the support block has a top pin and an abutting side surface arranged oppositely; the top pin of the support block is arranged in the through hole, and the movable die core is provided with an abutting plane parallel to the mold opening and closing direction, and the abutting side surface of the support block abuts on the abutting plane of the movable die core under the action of the elastic member.
[0007] Further, a limiting slot hole is formed on the support block, a limiting pin is arranged on the inclined ejector rod, and the limiting pin is arranged in the limiting slot hole of the support block to limit the support block from separating from the receiving cavity.
[0008] Further, the elastic member is a spring; the support block is provided with a mounting groove, the spring is accommodated in the mounting groove of the support block; and the two ends of the spring abut on the inner wall of the receiving cavity and the groove bottom of the mounting groove, respectively.
[0009] Further, the abutting side surface of the support block is a plane parallel to the abutting plane; and the support block is further provided with an inclined guide surface on the same side as the abutting side surface, and the inclined guide surface is located at the rear end of the abutting side surface in the ejection direction of the inclined ejector rod.
[0010] Further, the movable mold core is provided with an inclined limiting surface parallel to the inclined guide surface at the rear end of the abutting plane.
[0011] The injection mold for the inside reverse buckling product comprises a fixed mold, a fixed mold core assembled on the fixed mold, a movable mold, and a movable mold core assembled on the movable mold; the mold closing of the fixed mold and the movable mold enables the fixed mold core and the movable mold core to be closed and surrounded to form a molding cavity; wherein the movable mold core is provided with the above-mentioned ejection mechanism for the inside reverse buckling product; and the inclined ejector rod is further connected to the ejector rod plate of the movable mold.
[0012] Further, the ejection mechanism for the inside reverse buckling product is provided with a plurality of ejection mechanisms and is distributed on opposite sides of the movable mold core.
[0013] Further, in the mold closing state of the fixed mold and the movable mold, the ejector pin of the support block is flush with the molding surface.
[0014] The technical scheme provided by the utility model has the following beneficial effects:
[0015] When demolding, the inclined ejector rod is inclined to eject, and in the ejection process, the support block is limited by the abutting plane of the movable mold core, so that the position of the support block is kept in the direction perpendicular to the mold opening and closing, and the product is always supported by the ejector pin of the support block in the lateral deviation process of the inclined ejector rod, so that the reverse buckling of the product from the inclined ejector rod can be well guaranteed, and the product can be smoothly pushed out; when the inclined ejector rod is ejected to the position where the support block loses the abutting limitation of the abutting plane of the movable mold core, the ejector pin of the support block cancels the support to the product, so that the product is demolded; thus, the injection molding yield of the product can be effectively improved. BRIEF DESCRIPTION OF DRAWINGS
[0016] Figure 1 Fig. 1 shows a sectional view of the injection mold for the inside reverse buckling product in the mold closing state in the embodiment;
[0017] Figure 2 Fig. 2 shows a sectional view of the injection mold for the inside reverse buckling product in the mold closing state in the embodiment; Figure 1 Fig. 3 shows an enlarged schematic view of area A in Fig. 2;
[0018] Figure 3 Fig. 4 shows a partial structure sectional view of the injection mold for the inside reverse buckling product after the injection molding in the embodiment;
[0019] Figure 4 Fig. 5 shows a sectional view of the injection mold for the inside reverse buckling product in the mold closing state in the embodiment; Figure 3 Fig. 6 shows an enlarged schematic view of area B in Fig. 5;
[0020] Figure 5 Figure 3 shows a partial cross-section of the injection mold of the inside undercut product in the embodiment during the ejection process Figure 1 ;
[0021] Figure 6 Figure 3 shows a partial cross-section of the injection mold of the inside undercut product in the embodiment during the ejection process Figure 2 . DETAILED DESCRIPTION
[0022] To further illustrate the embodiments, the utility model provides the drawings. These drawings are part of the utility model disclosure, which mainly serves to illustrate the embodiments, and can be combined with the relevant description of the specification to explain the operating principle of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementations and the advantages of the utility model. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.
[0023] In the description of the present application, the terms "upper", "lower", "left", "right", "front", "back" and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and not to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application.
[0024] The utility model will be further illustrated in conjunction with the drawings and specific embodiments.
[0025] Referring to Figure 1 and Figure 2 , the embodiment provides an ejection mechanism of inside undercut product, which comprises an inclined ejector rod 11 and a delay support structure, the inclined ejector rod 11 is obliquely arranged on the movable die core 32, specifically, the oblique arrangement refers to the opening and closing direction of the injection mold, and the opening and closing direction of the injection mold is defined as the front-back direction. The inclined ejector rod 11 is provided with a forming surface 111 for forming an inside undercut, a receiving cavity 112 and a through hole penetrating from the receiving cavity 112 to the forming surface 111;The delay support structure comprises a support block 12 and an elastic member 13, the support block 12 is assembled in the receiving cavity 112 and can move in the direction perpendicular to the opening and closing of the mold;As in the embodiment, the support block 12 can move in the left-right direction perpendicular to the opening and closing of the mold. The support block 12 has an abutting side surface 122 and a top pin 121 arranged oppositely;The top pin 121 of the support block 12 is arranged in the through hole, and the movable die core 32 is provided with an abutting plane 321 parallel to the opening and closing direction, and the support block 12 is abutted on the abutting plane 321 of the movable die core 32 under the action of the elastic member 13;That is, the elastic member 13 exerts a spring force on the support block 12 towards the abutting plane 321.
[0026] The embodiment also provides an injection mold for the inner reverse buckling product, comprising a static mold 21, a static mold core 31 assembled on the static mold 21, a dynamic mold 22, and a dynamic mold core 32 assembled on the dynamic mold 22; the mold closing of the static mold 21 and the dynamic mold 22 makes the static mold core 31 and the dynamic mold core 32 close and form a molding cavity 101; wherein the dynamic mold core 32 is provided with the ejection mechanism for the inner reverse buckling product; and the inclined ejector pin 11 is also connected to the ejector pin plate 221 of the dynamic mold 22.
[0027] Continuing to refer to Figures 3 to 6 The embodiment provides a scheme, the static mold 21 and the dynamic mold 22 are in the mold closing state to inject the product 1, after the product 1 is formed, the static mold 21 and the dynamic mold 22 are opened, the inclined ejector pin 11 is driven by the ejector pin plate 221 of the dynamic mold 22 to be ejected, and the inclined ejection is specifically achieved, that is, the product 1 is moved laterally (left and right directions) while being ejected forward, so as to be separated from the product 1 laterally. In this process, the support block 12 is limited by the abutting surface 321 of the dynamic mold core 32, so as to be kept stationary in the left and right directions, and thus, when the inclined ejector pin 11 is separated laterally, the top pin 121 of the support block 12 can support the side surface of the product 1, so as to keep the product 1 in the left and right directions, thereby achieving the separation of the reverse buckling and the inclined ejector pin 11, as shown in Figure 5 When the inclined ejector pin 11 is ejected to the position where the support block 12 loses the abutting limitation of the abutting surface 321 of the dynamic mold core 32, the top pin 121 of the support block 12 loses the support of the product 1, so as to release the product 1; in this way, the injection yield of the product 1 can be effectively improved.
[0028] Further, in the embodiment, the support block 12 is provided with a limiting slot hole 124, the inclined ejector pin 11 is provided with a limiting pin 14, and the limiting pin 14 is arranged in the limiting slot hole 124 of the support block 12 to limit the separation of the support block 124 from the accommodating cavity 112. When the support block 12 loses the abutting limitation of the abutting surface 321 of the dynamic mold core 32, the support block 12 cannot be separated from the accommodating cavity 112 through the limiting cooperation of the limiting pin 14 and the limiting slot hole 124; the next operation is ensured. The limiting cooperation of the limiting pin 14 and the limiting slot hole 124 is simple in structure and easy to implement. Of course, in other embodiments, other limiting methods can also be used for limiting, such as a limiting boss arranged at the opening of the accommodating cavity 112.
[0029] In the embodiment, the elastic member 13 is a spring; the support block 12 is provided with a mounting groove 125, and the spring is accommodated in the mounting groove 125 of the support block 12; the two ends of the spring abut against the inner wall of the accommodating cavity 112 and the groove bottom of the mounting groove 125 respectively; in this way, the stable assembly of the spring is realized, and the assembly structure is simple and compact. Of course, in other embodiments, the elastic member 13 can also be replaced by other elastic components such as a tension spring and a spring piece, as long as the elastic force in the direction of the abutting plane 321 of the movable die core 32 can be applied to the support block 12.
[0030] The abutting side surface 122 of the support block 12 is a plane parallel to the abutting plane 321; so as to stably fit with the abutting plane 321. The support block 12 is further provided with an inclined guide surface 123 on the same side as the abutting side surface 122, and the inclined guide surface 123 is located at the rear end of the abutting side surface 122 in the ejection direction of the inclined ejector pin 11. In this way, when the support block 12 is separated from the movable die core 32 and the mold is closed again, the backward movement of the inclined ejector pin 11 will make the inclined guide surface 123 of the support block 12 abut against the movable die core 32, so that the guide cooperation is formed, the support block can be smoothly retracted against the action of the elastic member 13, and thus the abutting side surface 122 of the support block 12 can abut against the abutting plane 321 again; the reset is realized; and the jamming is not easy.
[0031] Further, the movable die core 32 is provided with an inclined limiting surface 322 parallel to the inclined guide surface 123 at the rear end of the abutting plane 321; in this way, when the inclined ejector pin 11 is retracted in place, the inclined guide surface 123 of the support block 12 abuts against the inclined limiting surface 322 of the movable die core 32 to realize limiting; the positioning effect is good, and the demolding stroke is ensured.
[0032] Further, in the mold closing state of the stationary die 21 and the movable die 22, the ejector pin 121 of the support block 12 is flush with the forming surface 111; in this way, the surface of the molded product 1 is ensured to be flat.
[0033] In the embodiment, since the product 1 is provided with four inverted buckles, the ejection mechanism of the inner inverted buckle product is provided with four, and is distributed on the opposite sides of the movable die core 32; so as to form four inverted buckle structures respectively. Of course, in other embodiments, the number and distribution position of the ejection mechanism can be selected according to the actual layout of the product.
[0034] Although the utility model is specifically shown and introduced in combination with the preferred embodiment, those skilled in the art should understand that various changes can be made to the utility model in form and details without departing from the spirit and scope of the utility model defined in the appended claims, and all are within the protection scope of the utility model.
Claims
1. An ejection mechanism for an inside-dosed product, characterized in that: The ejection mechanism of the inner reverse buckle product comprises a slanted ejector rod and a time-delay supporting structure, the slanted ejector rod is obliquely arranged on a movable die core, the slanted ejector rod is provided with a forming surface for forming the inner reverse buckle, a containing cavity and a through hole penetrating from the containing cavity to the forming surface, the time-delay supporting structure comprises a supporting block and an elastic element, the supporting block is assembled in the containing cavity and can move in a direction perpendicular to the opening and closing of the mold, the supporting block is provided with a top pin and an abutting side surface arranged oppositely, the top pin of the supporting block penetrates the through hole, the movable die core is provided with an abutting plane parallel to the opening and closing direction of the mold, and the abutting side surface of the supporting block abuts on the abutting plane of the movable die core under the action of the elastic element.
2. The ejection mechanism for inside-dosed products according to claim 1, characterized in that: A limiting slot hole is arranged on the supporting block, a limiting pin is arranged on the slanted ejector rod, and the limiting pin penetrates the limiting slot hole of the supporting block to limit the supporting block from separating from the containing cavity.
3. The inside-dosed product ejection mechanism of claim 1, wherein: The elastic element is a spring, the supporting block is provided with a mounting groove, the spring is contained in the mounting groove of the supporting block, and two ends of the spring abut on the inner wall of the containing cavity and the groove bottom of the mounting groove respectively.
4. The ejection mechanism for inside-dosed products according to claim 1, characterized in that: The abutting side surface of the supporting block is a plane parallel to the abutting plane, and the supporting block is further provided with an inclined guide surface on the same side of the abutting side surface, and the inclined guide surface is located at the rear end of the abutting side surface in the ejection direction of the slanted ejector rod.
5. The ejection mechanism for inside-dosed products according to claim 4, characterized in that: The movable die core is provided with an inclined limiting plane parallel to the inclined guide surface at the rear end of the abutting plane.
6. An injection mold for an inside undercut product, comprising a stationary mold, a stationary mold core assembled on the stationary mold, a movable mold, and a movable mold core assembled on the movable mold; the mold closing of the stationary mold and the movable mold makes the stationary mold core and the movable mold core close and enclose a molding cavity; characterized in that: The movable die core is provided with the ejection mechanism of the inner reverse buckle product according to any one of claims 1 to 5, and the slanted ejector rod is further connected to the ejector rod plate of the movable die.
7. The inside-draft product-inverting injection mold of claim 6, wherein: The ejection mechanism of the inner reverse buckle product is provided with a plurality of ejection mechanisms and is distributed on opposite sides of the movable die core.
8. The inside-draft product-inverting injection mold of claim 6, wherein: In the completed mold closing state of the stationary die and the movable die, the top pin of the supporting block is flush with the forming surface.