Structure for preventing metal insert from falling off and injection mold
By setting holes and notches on the positioning pins to form elastic arms to tighten the inner circumference of the metal insert, the problem of easy falling off of the metal insert during injection molding is solved, and higher product quality and lower defective yield are achieved.
Patent Information
- Application Number
- CN202421658938.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-12
AI Technical Summary
During injection molding and mold closure, metal inserts are prone to fall off, resulting in bad products and may damage the mold.
A structure is designed to prevent the metal insert from falling off, and by providing openings and notches on the positioning pins, a plurality of elastic arms are formed to tighten the inner circumference side of the metal insert, ensuring that it does not fall off during the injection molding process.
It effectively prevents metal inserts from falling off during injection molding, reduces the occurrence of defective products, avoids mold damage, and improves product quality.
Smart Images
Figure CN222792603U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of injection molding, and in particular to a structure for preventing a metal insert from falling off and an injection mold. Background Art
[0002] In the field of new energy vehicles, more and more functional parts are implanted with metal inserts in plastic molds during injection molding. The traditional positioning method of metal curling / bushing inserts and plastic molds is that a metal insert is mounted on a structure that prevents the metal insert from falling off. Since the metal insert has a processing tolerance band, the metal insert may be loose when installed on the structure that prevents the metal insert from falling off, causing the metal insert to vibrate during the injection molding process, resulting in the metal insert easily falling off, resulting in defective products, and even damaging the mold, resulting in huge waste. Utility Model Content
[0003] The purpose of the embodiments of the utility model is to provide a structure and an injection mold to prevent metal inserts from falling off, aiming to solve the problem that the existing metal inserts are easy to fall off during the injection molding process, thereby bringing the risk of crushing the mold.
[0004] In order to solve the above technical problems, the embodiment of the utility model provides a structure for preventing the metal insert from falling off, comprising:
[0005] A positioning pin, the positioning pin having a first end and a second end opposite to each other in the axial direction of the positioning pin, the second end being used to be arranged on the injection mold, an opening extending along the axial direction of the positioning pin being arranged on the end surface of the first end, a notch extending along the axial direction of the positioning pin being arranged through the hole side wall of the opening, one end of the notch passing through the end surface of the first end, a plurality of the notches being arranged at intervals along the circumference of the positioning pin, so that the hole side wall of the opening is separated by the plurality of the notches to form a plurality of elastic arms;
[0006] A metal insert is sleeved outside the first end, and the plurality of elastic arms abut against the inner peripheral side surface of the metal insert, so that the plurality of elastic arms are bent and deformed in a direction of approaching each other to limit the metal insert from disengaging from the positioning pin.
[0007] The locating pin of the utility model uses an open structure to form a plurality of elastic arms on the locating pin, and the plurality of elastic arms are used to press against the inner peripheral side surface of the metal insert to ensure that the metal insert will not fall off from the locating pin during the injection molding process, thereby solving the problem that the metal insert is easy to fall off during the injection molding process, and will not cause adverse effects on the product size, so as to obtain better product quality and eliminate the hidden danger of defective products.
[0008] Preferably, the plurality of notches are evenly spaced apart along the circumference of the positioning pin.
[0009] Preferably, four notches are provided, so that the side walls of the opening are evenly divided by the four notches to form four elastic arms; each elastic arm is arranged perpendicularly to each other on two opposite side surfaces of the circumferential direction of the positioning pin.
[0010] Preferably, the outer diameter of a portion of the first end close to the end surface of the first end gradually decreases in the direction from the second end to the first end, so as to form an introduction slope on the portion of the outer surface of each elastic arm close to the end surface of the first end.
[0011] Preferably, the metal insert is located on a side of the introduction slope away from an end surface of the first end.
[0012] Preferably, an abutment limiting surface is provided on the peripheral side surface of the positioning pin, and the abutment limiting surface abuts against a side of the end surface of the metal insert away from the first end.
[0013] Preferably, the abutment limiting surface is located on a side of the end surface of the plurality of notches away from the first end.
[0014] Preferably, the opening is a blind hole.
[0015] Preferably, a dimension of the opening in the axial direction of the positioning pin is larger than a dimension of the notch in the axial direction of the positioning pin.
[0016] In order to achieve the above object, the utility model also provides an injection mold, including the above structure for preventing the metal insert from falling off. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.
[0018] Figure 1 This is a schematic diagram of the structure for preventing the metal insert from falling off in an embodiment of the utility model;
[0019] Figure 2 for Figure 1 A cross-sectional view of the structure for preventing the metal insert from falling off;
[0020] Figure 3 for Figure 1 Another cross-sectional view of the structure for preventing the metal insert from falling off;
[0021] Figure 4 for Figure 1 Schematic diagram of the structure of the positioning pin.
[0022] Description of the figures of the utility model:
[0023] Structure 100 for preventing metal insert from falling off, positioning pin 1, first end 11, second end 12, opening 13, notch 14, elastic arm 15, introduction slope 16, abutment limit surface 17, metal insert 2, annular groove 21, chamfer 22.
[0024] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.
[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0028] In order to prevent the metal insert from falling off during the injection molding process, the utility model provides a structure for preventing the metal insert from falling off. The structure for preventing the metal insert from falling off can be applied to metal insert injection molding products with metal curling / bushing inserts. The structure for preventing the metal insert from falling off can be used on injection molds. Figures 1 to 4 A preferred embodiment of the structure for preventing metal inserts from falling off provided by the utility model is shown.
[0029] See also Figures 1 to 4In this embodiment, the structure 100 for preventing the metal insert from falling off includes a positioning pin 1 and a metal insert 2 .
[0030] See also Figures 1 to 4 The locating pin 1 has a first end 11 and a second end 12 which are opposite to each other in the axial direction of the locating pin 1. The second end 12 is used to be arranged on the injection mold. An opening 13 extending along the axial direction of the locating pin 1 is arranged on the end surface of the first end 11. A notch 14 extending along the axial direction of the locating pin 1 is penetrated through the side wall of the opening 13. One end of the notch 14 penetrates the end surface of the first end 11. A plurality of notches 14 are arranged at intervals along the circumference of the locating pin 1, so that the side wall of the opening 13 is separated by the plurality of notches 14 to form a plurality of elastic arms 15.
[0031] Specifically, the positioning pin 1 is usually set in a cylindrical shape. The axial direction of the positioning pin 1 is defined as the up-down direction below. One of the first end 11 and the second end 12 is the upper end of the positioning pin 1, and the other is the lower end of the positioning pin 1. The positioning pin 1 can be fixedly set on the upper mold or the lower mold of the injection mold through the second end 12. When the positioning pin 1 is fixedly set on the upper mold of the injection mold through the second end 12, the second end 12 is usually the upper end of the positioning pin 1; and when the positioning pin 1 is fixedly set on the lower mold of the injection mold through the second end 12, the second end 12 is usually the lower end of the positioning pin 1. The following will take the positioning pin 1 being set on the lower mold of the injection mold, the first end 11 being the upper end of the positioning pin 1, and the second end 12 being the lower end of the positioning pin 1 as an example for introduction.
[0032] When the second end 12 of the positioning pin 1 is arranged on the lower mold of the injection mold, the first end 11 of the positioning pin 1 protrudes upward from the lower mold of the injection mold. An opening 13 extending in the up-down direction is arranged on the upper end surface of the positioning pin 1. The opening 13 can be a blind hole, that is, the lower end of the opening 13 does not penetrate the lower end surface of the positioning pin 1; the opening 13 can also be a through hole, that is, the lower end of the opening 13 penetrates the lower end surface of the positioning pin 1. The shape of the opening 13 is usually compatible with the shape of the positioning pin 1. For example, in this embodiment, the opening 13 is a round hole.
[0033] A notch 14 extending in the up-down direction is provided through the side wall of the opening 13, and the notch 14 penetrates the inner and outer side walls of the opening 13 upwardly and inwardly, and the upper end of the notch 14 penetrates the upper end surface of the positioning pin 1. When the opening 13 is a through hole, the size of the opening 13 in the axial direction of the positioning pin 1 (i.e., the hole depth of the opening 13) is greater than the size of the notch 14 in the axial direction of the positioning pin 1 (i.e., the length of the notch 14). When the size of the opening 13 in the axial direction of the positioning pin 1 is greater than or equal to the size of the notch 14 in the axial direction of the positioning pin 1.
[0034] Optionally, see Figures 1 to 4In this embodiment, the dimension of the opening 13 in the axial direction of the positioning pin 1 is larger than the dimension of the notch 14 in the axial direction of the positioning pin 1. The depth of the opening 13 is larger than the length of the notch 14, that is, the notch 14 does not extend to the lower end of the opening 13, so that the structural strength at the lower end of the opening 13 can be improved.
[0035] A plurality of notches 14 are provided on the side wall of the opening 13 at intervals along the circumference of the positioning pin 1, and a portion of the side wall between two adjacent notches 14 forms an elastic arm 15, so that the side wall of the opening 13 is separated by the plurality of notches 14 to form a plurality of elastic arms 15. The lengths of the plurality of notches 14 may be completely equal, or the lengths of at least two of the notches 14 may be unequal.
[0036] The plurality of notches 14 are usually arranged at even intervals along the circumference of the positioning pin 1, so as to form a plurality of elastic arms 15 of equal width (the width of the elastic arm 15 is the dimension of the elastic arm 15 in the circumference of the positioning pin 1). The number of notches 14 is usually equal to the number of elastic arms 15, and the specific number of notches 14 can be set according to actual conditions. Figures 1 to 4 In this embodiment, four notches 14 are provided to evenly separate the side walls of the opening 13 through the four notches 14 to form four elastic arms 15; each elastic arm 15 is arranged perpendicularly to each other on two opposite sides of the circumferential direction of the positioning pin 1.
[0037] Specifically, the four notches 14 are arranged in a cross shape, two of the four elastic arms 15 are spaced opposite to each other in the transverse direction, and the other two are spaced opposite to each other in the longitudinal direction. Each elastic arm 15 includes an inner surface close to the central axis of the positioning pin 1, an outer surface away from the central axis of the positioning pin 1, and two side surfaces between the inner surface and the outer surface, and the two side surfaces of each elastic arm 15 are spaced opposite to each other in the circumferential direction of the positioning pin 1, and the two side surfaces of each elastic arm 15 are vertical or approximately vertical.
[0038] See also Figures 1 to 4 The metal insert 2 is sleeved outside the first end 11, and the multiple elastic arms 15 abut against the inner peripheral side of the metal insert 2, so that the multiple elastic arms 15 are bent and deformed in a direction close to each other to limit the metal insert 2 from being disengaged from the positioning pin 1.
[0039] Specifically, the metal insert 2 is arranged in a cylindrical shape extending in the vertical direction. The specific style of the metal insert 2 can be set according to actual conditions. Figures 1 to 4 In this embodiment, an annular groove 21 is provided on the outer peripheral side surface of the metal insert 2, and chamfers 22 are provided at the upper end and the lower end of the metal insert 2.
[0040] The metal insert 2 can be inserted downward from directly above the positioning pin 1 to the outside of the first end 11 of the positioning pin 1. Since the inner diameter of the metal insert 2 is smaller than the outer diameter of the first end 11 of the positioning pin 1, during the process of inserting the metal insert 2 to the outside of the first end 11 of the positioning pin 1, the metal insert 2 will contact the upper ends of the multiple elastic arms 15, and form an inward pressure on the multiple elastic arms 15, so that the multiple elastic arms 15 are bent and deformed in a direction of approaching each other, so that the metal insert 2 can be completely inserted on the first end 11 of the positioning pin 1, thereby fixing the metal insert 2 on the upper end of the positioning pin 1 to prevent the metal insert 2 from being separated from the positioning pin 1.
[0041] Optionally, see Figures 1 to 4 In this embodiment, the outer diameter of the portion of the first end 11 close to the end face of the first end 11 gradually decreases in the direction from the second end 12 to the first end 11, so as to form an introduction slope 16 on the portion of the outer surface of each elastic arm 15 close to the end face of the first end 11.
[0042] Specifically, an introduction slope 16 is formed at the upper end of the outer surface of each elastic arm 15, and the upper edge of the introduction slope 16 is connected to the upper end surface of the positioning pin 1. The outer diameter of the first end 11 close to the upper end surface is smaller than the inner diameter of the metal insert 2. Through the setting of the introduction slope 16, the metal insert 2 can be mounted on the first end 11 of the positioning pin 1 with less effort, and the metal insert 2 can also better allow multiple elastic arms 15 to bend and deform and move closer to each other.
[0043] For further information, see Figures 1 to 4 In this embodiment, the metal insert 2 is located on a side of the introduction slope 16 away from the end surface of the first end 11 .
[0044] Specifically, the lower edge of the introduction slope 16 is located on the upper side of the metal insert 2, thereby ensuring that the upper end of the inner peripheral side surface of the metal insert 2 can contact the multiple elastic arms 15, increasing the contact area between the multiple elastic arms 15 and the metal insert 2, which is conducive to firmly fixing the metal insert 2 on the positioning pin 1.
[0045] The locating pin 1 of the utility model uses an open structure to form a plurality of elastic arms 15 on the locating pin 1, and the plurality of elastic arms 15 are pressed against the inner peripheral side of the metal insert 2 to ensure that the metal insert 2 will not fall off from the locating pin 1 during the injection molding process, thereby solving the problem that the metal insert 2 is easy to fall off during the injection molding process, and will not cause adverse effects on the product size, so as to obtain better product quality and eliminate the hidden danger of defective products.
[0046] Optionally, see Figures 1 to 4 In this embodiment, a contact limiting surface 17 is provided on the peripheral side surface of the positioning pin 1 , and the contact limiting surface 17 abuts against a side of the end surface of the metal insert 2 away from the first end 11 .
[0047] Specifically, an upward-facing abutment limit surface 17 is provided on the peripheral side surface of the positioning pin 1. When the metal insert 2 is mounted on the positioning pin 1, the abutment limit surface 17 is located on the lower side of the metal insert 2, and the abutment limit surface 17 abuts against the lower end surface of the metal insert 2, thereby realizing the upward and downward installation positioning between the metal insert 2 and the positioning pin 1.
[0048] For further information, see Figures 1 to 4 In this embodiment, the abutment limiting surface 17 is an annular abutment limiting surface extending along the circumference of the positioning pin 1 and facing upward.
[0049] Specifically, the positioning pin 1 is arranged in a stepped shaft shape with a small upper part and a large lower part, so that a circular abutment limit surface 17 is formed on the peripheral side of the positioning pin 1. The width of the abutment limit surface 17 is usually equal to or slightly larger than the thickness of the metal insert 2, so that the lower end surface of the metal insert 2 can completely fit the abutment limit surface 17. Among them, the width of the abutment limit surface 17 refers to the size of the abutment limit surface 17 in the radial direction of the positioning pin 1, and the thickness of the metal insert 2 is half of the difference between the outer diameter and the inner diameter of the metal insert 2.
[0050] The distance from the abutting limiting surface 17 to the upper end surface of the positioning pin 1 may be greater than or less than the hole depth of the opening 13, and the distance from the abutting limiting surface 17 to the upper end surface of the positioning pin 1 may also be equal to the hole depth of the opening 13. Similarly, the distance from the abutting limiting surface 17 to the upper end surface of the positioning pin 1 may be greater than or less than the length of the notch 14, and the distance from the abutting limiting surface 17 to the upper end surface of the positioning pin 1 may also be equal to the length of the notch 14.
[0051] Optionally, see Figures 1 to 4 In this embodiment, the abutting limiting surface 17 is located on the side of the end surface of the plurality of notches 14 away from the first end 11. The abutting limiting surface 17 is located on the lower side of the plurality of notches 14, that is, the distance from the abutting limiting surface 17 to the upper end surface of the positioning pin 1 can be greater than or less than the length of the notch 14.
[0052] The utility model also provides an injection mold, which can be used to produce metal insert injection products, and can solve the problem that the metal insert is easy to fall off during the injection mold closing process. The injection mold is mainly used for metal insert injection products with metal curling / bushing inserts. Since the injection mold includes a structure to prevent the metal insert from falling off, and the structure to prevent the metal insert from falling off adopts the technical solution of the above embodiment, it has the beneficial effects brought by the technical solution of the above embodiment.
[0053] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A structure for preventing a metal insert from falling off, characterized in that: include: A positioning pin, the positioning pin having a first end and a second end opposite to each other in the axial direction of the positioning pin, the second end being used to be arranged on the injection mold, an opening extending along the axial direction of the positioning pin being arranged on the end surface of the first end, a notch extending along the axial direction of the positioning pin being arranged through the hole side wall of the opening, one end of the notch passing through the end surface of the first end, a plurality of the notches being arranged at intervals along the circumference of the positioning pin, so that the hole side wall of the opening is separated by the plurality of the notches to form a plurality of elastic arms; A metal insert is sleeved outside the first end, and the plurality of elastic arms abut against the inner peripheral side surface of the metal insert, so that the plurality of elastic arms are bent and deformed in a direction of approaching each other to limit the metal insert from disengaging from the positioning pin.
2. The structure for preventing metal inserts from falling off according to claim 1, characterized in that: The plurality of notches are evenly spaced apart along the circumference of the positioning pin.
3. The structure for preventing metal inserts from falling off as claimed in claim 2, characterized in that: There are four notches, so that the side walls of the opening are evenly divided by the four notches to form four elastic arms; each elastic arm is arranged perpendicularly to each other on two side surfaces opposite to each other in the circumferential direction of the positioning pin.
4. The structure for preventing metal inserts from falling off according to claim 1, characterized in that: The outer diameter of a portion of the first end close to the end surface of the first end gradually decreases in a direction from the second end to the first end, so as to form an introduction slope on a portion of the outer surface of each elastic arm close to the end surface of the first end.
5. The structure for preventing metal inserts from falling off as claimed in claim 4, characterized in that: The metal insert is located on a side of the introduction slope away from an end surface of the first end.
6. The structure for preventing metal inserts from falling off according to claim 1, characterized in that: An abutment limiting surface is arranged on the peripheral side surface of the positioning pin, and the abutment limiting surface abuts against a side of the end surface of the metal insert away from the first end.
7. The structure for preventing the metal insert from falling off according to claim 6, characterized in that: The abutting limiting surface is located on a side of the end surface of the plurality of notches away from the first end.
8. The structure for preventing metal inserts from falling off as claimed in claim 1, characterized in that: The opening is a blind hole.
9. The structure for preventing metal inserts from falling off according to claim 1, characterized in that: The dimension of the opening in the axial direction of the positioning pin is larger than the dimension of the notch in the axial direction of the positioning pin.
10. An injection mold, characterized in that: The invention comprises a structure for preventing the metal insert from falling off as described in any one of claims 1 to 9.