Plug-in structure for preventing injection molding overflow
Patent Information
- Application Number
- CN202522347367.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-05
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2035-11-05
AI Technical Summary
若金属嵌件与插杆微量间隙配合，虽然两者装配轻松，但在注胶时，金属嵌件容易被胶料带动而相对插杆上移，出现底部溢胶甚至盖住金属嵌件底面的情况，导致后续还需对获得的产品进行修型以去除多余的胶料，这不仅增大胶料成本，还将加工工序复杂化；若金属嵌件与插杆微量过盈配合，则两者不易装配，容易出现卡住而无法装配到位的情况，而在装配过程中，两者相互摩擦而铲出金属屑，导致金属嵌件内部有磨损，影响后期使用
[0004]为解决上述技术问题和达到本申请的至少一个优势，本申请提供防注塑溢胶的插接结构，能够插入金属嵌件，所述金属嵌件具有插孔和封堵孔，所述插孔与所述封堵孔连通，所述防注塑溢胶的插接结构包括：
Smart Images
Figure CN224915200U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of injection molding technology, and in particular to a plug structure for preventing injection molding overflow. Background Technology
[0002] In the injection molding industry, embedding metal inserts such as nuts and bushings is a common practice to enhance the strength and functionality of plastic parts. Currently, before injection molding, the metal inserts need to be fitted around the outer periphery of the insert to prevent the interior of the metal insert from being filled with plastic material.
[0003] Because the aperture of the metal insert has a predetermined tolerance range, after the metal insert and the insert rod are assembled, there will be a slight clearance fit or a slight interference fit between them. If the metal insert and the insert rod have a slight clearance fit, although the assembly is easy, during glue application, the metal insert is easily moved upward relative to the insert rod by the glue, resulting in glue overflow at the bottom or even covering the bottom surface of the metal insert. This requires subsequent reshaping of the obtained product to remove excess glue, which not only increases the cost of the glue but also complicates the processing steps. If the metal insert and the insert rod have a slight interference fit, the two are difficult to assemble and are prone to jamming and failure to be assembled properly. During the assembly process, the two rub against each other, scraping off metal shavings, causing internal wear on the metal insert and affecting its later use. Utility Model Content
[0004] To solve the aforementioned technical problems and achieve at least one advantage of this application, this application provides a plug-in structure for preventing injection molding overflow, capable of inserting a metal insert having a socket and a sealing hole, the socket communicating with the sealing hole, the plug-in structure for preventing injection molding overflow comprising:
[0005] A plug rod is inserted into the socket of the metal insert and extends from the socket to the sealing hole, with a portion of the plug rod placed inside the sealing hole to prevent adhesive from flowing from the sealing hole to the socket;
[0006] A fastening assembly includes at least one fastener and at least one abutment. The fastener is formed at one end of the insert and extends along the length of the insert. The abutment is formed on a side wall of the at least one fastener away from the axis of the insert. The side of the abutment away from the fastener is subjected to pressure, causing the fastener to elastically deform and bend toward the axis of the insert. When the insert is inserted into the metal insert, the abutment on the surface of the at least one fastener is interference-fitted with the inner wall of the sealing hole.
[0007] According to one embodiment of this application, the fasteners are provided in multiple ways, and at least two of the fasteners have an abutment on their surfaces, and all the abutments are kept at the same horizontal height and have the same thickness.
[0008] According to one embodiment of this application, the fasteners are provided in multiple ways, and at least two of the fasteners have an abutment on their surfaces. The horizontal planes where the at least two abutments are located have a predetermined height difference, and the thickness of the abutment located at the higher position is greater than the thickness of the abutment located at the lower position.
[0009] According to one embodiment of this application, there is a gap between the end face of the fastener near the insertion rod and the edge of the corresponding end face of the insertion rod.
[0010] According to one embodiment of this application, the side of the fastener away from the axis of the insertion rod is connected to the peripheral wall of the insertion rod and is partially inclined, and with reference to the direction in which the fastener extends toward the insertion rod, the cross-sectional dimension of the end of the fastener away from the insertion rod gradually increases.
[0011] According to one embodiment of this application, at least one of the fasteners is not provided with the abutment.
[0012] According to one embodiment of this application, the insertion rod includes a sealing part and a rod body. The sealing part is disposed at one end of the rod body, and the fastener is formed on the end face of the sealing part away from the rod body. The rod body is inserted into the insertion hole and drives the sealing part to move into the sealing hole. The sealing part is used to prevent the adhesive from flowing into the insertion hole from the sealing hole.
[0013] According to one embodiment of this application, the sealing portion is detachably connected to the rod body.
[0014] According to one embodiment of this application, the aperture tolerance of the metal insert is -0.02~0.02mm, and three fasteners are provided, wherein two of the fasteners have the abutment on their surfaces, and the thickness of the abutment located at the lower position is 0.02~0.025mm, and the thickness of the abutment located at the higher position is 0.04~0.045mm.
[0015] According to one embodiment of this application, when the abutment is fitted to the inner wall of the sealing hole, the interference fit between the two is 0.005~0.01mm. Attached Figure Description
[0016] Figure 1 The diagram illustrates a usage scenario of the plug-in structure for preventing injection molding overflow described in this application.
[0017] Figure 2 A cross-sectional view of the plug structure for preventing injection molding overflow described in this application is shown in a usage scenario.
[0018] Figure 3 It shows Figure 2 Enlarged view of a local structure.
[0019] Figure 4 The diagram shows a perspective view of the insertion structure for preventing injection molding overflow described in this application.
[0020] Figure 5 It shows Figure 4 Enlarged view of a local structure.
[0021] Figure 6 This paper shows a perspective view of the insertion structure for preventing injection molding overflow described in this application.
[0022] Figure 7 It shows Figure 6 Enlarged view of a local structure. Detailed Implementation
[0023] The following description is intended to disclose this application and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of this application defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of this application.
[0024] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this application.
[0025] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.
[0026] refer to Figures 1 to 7 The plug-in structure for preventing injection molding overflow according to a preferred embodiment of the present application will be described in detail below. The plug-in structure for preventing injection molding overflow inserts a metal insert 90. The metal insert 90 has a plug hole 901 and a sealing hole 902. The plug hole 901 communicates with the sealing hole 902.
[0027] The plug-in structure for preventing injection molding overflow includes a plug rod 10, which is inserted into the socket 901 of the metal insert 90 and extends from the socket 901 to the sealing hole 902. The plug rod 10 is partially placed in the sealing hole 902 to prevent the adhesive from flowing from the sealing hole 902 to the socket 901.
[0028] The anti-overflow injection molding insertion structure includes a fastening component 20, which includes at least one fastener 21 and at least one abutment 22. The fastener 21 is formed at one end of the insertion rod 10 and extends along the length of the insertion rod 10. The abutment 22 is formed on one side wall of the fastener 21 away from the axis of the insertion rod 10. The side of the abutment 22 away from the fastener 21 is subjected to pressure, causing the fastener 21 to elastically deform and bend towards the axis of the insertion rod 10. When the insertion rod 10 is inserted into the metal insert 90, the abutment 22 on the surface of the at least one fastener 21 is interference-fitted with the inner wall of the sealing hole 902, preventing the metal insert 90 from moving along the direction extending from the insertion hole 901 towards the sealing hole 902 during injection molding, thus fixing the metal insert 90.
[0029] Those skilled in the art will understand that the aperture of the metal insert 90 has a predetermined tolerance range.
[0030] Specifically, when the anti-injection molding overflow plug structure is assembled with the metal insert 90, and the hole diameter tolerance of the metal insert 90 is between the lower and upper tolerances of the predetermined tolerance or is the lower tolerance, at least one of the abutting members 22 is subjected to pressure from the inner wall of the sealing hole 902, causing the corresponding fastener 21 to undergo elastic deformation and bend toward the axis of the plug rod 10. At the same time, the corresponding fastener 21, under its own elastic force, applies pressure to the inner wall of the sealing hole 902 through the abutting member 22 to achieve an interference fit, thereby preventing the metal insert 90 from moving relative to the plug rod 10 in the direction extending from the plug hole 901 toward the sealing hole 902.
[0031] When the anti-injection-molding overflow plug structure is assembled with the metal insert 90, and the hole diameter tolerance of the metal insert 90 is the upper limit of the predetermined tolerance, at least one of the abutting members 22 is in contact with the inner wall of the sealing hole 902. At this time, the two are in an interference fit, thereby preventing the metal insert 90 from moving relative to the plug rod 10 in the direction of extending from the plug hole 901 to the sealing hole 902.
[0032] It is worth mentioning that when the abutment 22 is fitted with the inner wall of the sealing hole 902, the interference fit between the two is 0.005~0.01mm.
[0033] In this way, the fastening component 20 of the anti-overflow insertion structure is interference-fitted with the metal insert 90. Compared with the connection method using a slight clearance fit between the insert rod 10 and the metal insert 90, this effectively prevents the metal insert 90 from moving relative to the insert rod 10 along the direction extending from the insertion hole 901 to the sealing hole 902 due to the force of the glue during injection molding, thus avoiding the situation where glue overflows at the bottom or even covers the bottom surface of the metal insert 90. Moreover, compared with the connection method using a slight interference fit between the insert rod 10 and the metal insert 90, it is easier to assemble in place, and there will be no wear on the inner wall of the metal insert 90 that would cause metal chips to be scraped out, thus ensuring the quality of the product formed by injection molding on the outside of the metal insert 90.
[0034] In one embodiment, multiple fasteners 21 are provided, and at least two of the fasteners 21 have an abutment 22 on their surfaces. All the abutments 22 are kept at the same horizontal height and have the same thickness, so that when the metal inserts 90 with different hole diameter tolerances are inserted into the anti-injection-molding-overflow plug structure, the abutment 22 abuts or fits against the inner wall of the sealing hole 902 to achieve an interference fit between the two.
[0035] Preferably, multiple fasteners 21 are provided, with at least two fasteners 21 having an abutment 22 on their surfaces. The horizontal planes of at least two abutment 22 have a predetermined height difference, and the thickness of the abutment 22 at the higher position is greater than that at the lower position. This allows the abutment 22 at different heights to contact the inner wall of the sealing hole 902 when the metal inserts 90 with different hole diameter tolerances are inserted into the anti-injection-molded plug structure, resulting in different postures for the fasteners 21. Compared to a configuration where all abutment 22 are at the same height, this effectively avoids excessive deformation and fatigue fracture of all fasteners 21 when the hole diameter tolerance of the metal insert 90 is low, thereby improving service life.
[0036] Specifically, when the anti-injection-molding-overflow plug structure is assembled with the metal insert 90, and the hole diameter tolerance of the metal insert 90 is between the lower and median values of the predetermined tolerance or the lower value, all the abutting members 22 are subjected to pressure from the inner wall of the sealing hole 902, causing the corresponding fasteners 21 to undergo elastic deformation and bend towards the axis of the plug rod 10. At the same time, the corresponding fasteners 21, under their own elastic force, apply pressure to the inner wall of the sealing hole 902 through the abutting members 22 to achieve an interference fit. In this way, all the abutting members 22 are used to prevent the metal insert 90 from moving relative to the plug rod 10 in the direction extending from the plug hole 901 towards the sealing hole 902.
[0037] When the anti-injection-molding overflow plug structure is assembled with the metal insert 90, and the hole diameter tolerance of the metal insert 90 is the median of the predetermined tolerance, the lower-positioned abutment 22 fits against the inner wall of the sealing hole 902, and the two are in an interference fit. The higher-positioned abutment 22 is subjected to the pressure of the inner wall of the sealing hole 902, causing the corresponding fastener 21 to undergo elastic deformation and bend towards the axis of the plug rod 10. At the same time, the corresponding fastener 21, under its own elastic force, applies pressure to the inner wall of the sealing hole 902 through the higher-positioned abutment 22 to achieve an interference fit. In this way, the abutment 22 at both the higher and lower positions prevents the metal insert 90 from moving relative to the plug rod 10 in the direction extending from the plug hole 901 to the sealing hole 902.
[0038] When the anti-injection-molding overflow plug structure is assembled with the metal insert 90, and the hole diameter tolerance of the metal insert 90 is between the median and upper tolerance of the predetermined tolerance, there is a gap between the lower abutment 22 and the inner wall of the sealing hole 902. The higher abutment 22 is subjected to pressure from the inner wall of the sealing hole 902, causing the corresponding fastener 21 to undergo elastic deformation and bend towards the axis of the plug rod 10. At the same time, the corresponding fastener 21, under its own elastic force, applies pressure to the inner wall of the sealing hole 902 through the higher abutment 22 to achieve an interference fit. In this way, the higher abutment 22 is used to prevent the metal insert 90 from moving relative to the plug rod 10 in the direction extending from the plug hole 901 to the sealing hole 902.
[0039] When the anti-injection-molding overflow plug structure is assembled with the metal insert 90, and the hole diameter tolerance of the metal insert 90 is the upper limit of the predetermined tolerance, there is a gap between the lower position abutment 22 and the inner wall of the sealing hole 902, and the higher position abutment 22 fits against the inner wall of the sealing hole 902. At this time, the two are interference-fitted, so as to use the higher position abutment 22 to prevent the metal insert 90 from moving relative to the plug rod 10 in the direction of extending from the plug hole 901 to the sealing hole 902.
[0040] In one embodiment, the fastener 21 has a gap between the edge of the end face of the fastener 21 near the insertion rod 10 and the edge of the corresponding end face of the insertion rod 10, so that during assembly, the end of the insertion rod 10 on which the fastener 21 is mounted is aligned with the port of the insertion hole 901 away from the end of the sealing hole 902.
[0041] Preferably, the side of the fastener 21 away from the axis of the insert rod 10 is connected to the peripheral wall of the insert rod 10 and is partially inclined. With reference to the direction in which the fastener 21 extends toward the insert rod 10, the cross-sectional dimension of the end of the fastener 21 away from the insert rod 10 gradually increases, so as to align the port of the insertion hole 901 away from the sealing hole 902, thereby increasing the convenience of the insertion structure for preventing injection molding overflow and the insertion of the metal insert 90.
[0042] Preferably, at least one of the fasteners 21 is not provided with the abutment 22, so that the hole diameter tolerance of the metal insert 90 is a lower tolerance of a predetermined tolerance, and the corresponding fastener 21 fits against the inner wall of the sealing hole 902, so as to cooperate with the abutment 22 and jointly make an interference fit with the metal insert 90.
[0043] Preferably, the aperture tolerance of the metal insert 90 is -0.02~0.02mm, and three fasteners 21 are provided, wherein two of the fasteners 21 have abutment members 22 on their surfaces, and the thickness of the abutment member 22 located at the lower position is 0.02~0.025mm, and the thickness of the abutment member 22 located at the higher position is 0.04~0.045mm.
[0044] Specifically, when the bore diameter tolerance of the metal insert 90 is -0.02 mm, the anti-injection-plastering insertion structure is an interference fit with the metal insert 90 such that all the abutment members 22 abut against the inner wall of the sealing hole 902 and the fasteners 21 without abutment members 22 are fitted against the inner wall of the sealing hole 902; when the bore diameter tolerance of the metal insert 90 is greater than -0.02 mm and less than 0 mm, the anti-injection-plastering insertion structure is an interference fit with the metal insert 90 such that all the abutment members 22 abut against the inner wall of the sealing hole 902; when the bore diameter tolerance of the metal insert 90 is 0 mm, the anti-injection-plastering insertion structure is an interference fit with the metal insert 90 such that all the abutment members 22 abut against the inner wall of the sealing hole 902; when the bore diameter tolerance of the metal insert 90 is 0 mm, the anti-injection-plastering insertion structure is an interference fit with the metal insert 90 such that all the abutment members 22 abut against the inner wall of the sealing hole 902. The lower-positioned abutment 22 abuts against the inner wall of the sealing hole 902, and the higher-positioned abutment 22 abuts against the inner wall of the sealing hole 902, thus forming an interference fit with the metal insert 90; when the diameter tolerance of the metal insert 90 is greater than 0 mm and less than 0.02 mm, the anti-injection-excess plug-in structure abuts against the inner wall of the sealing hole 902 with the higher-positioned abutment 22 in an interference fit with the metal insert 90; when the diameter tolerance of the metal insert 90 is 0.02 mm, the anti-injection-excess plug-in structure abuts against the inner wall of the sealing hole 902 with the higher-positioned abutment 22 in an interference fit with the metal insert 90.
[0045] Furthermore, the insertion rod 10 includes a sealing portion 11 and a rod body 12. The sealing portion 11 is disposed at one end of the rod body 12, and the fastener 21 is formed on the end face of the sealing portion 11 away from the rod body 12. The rod body 12 is inserted into the insertion hole 901 and drives the sealing portion 11 to move into the sealing hole 902. The sealing portion 11 is used to prevent adhesive from flowing into the insertion hole 901 from the sealing hole 902.
[0046] Preferably, the machining tolerance of the sealing part 11 is -0.005~0mm.
[0047] Specifically, when the aperture tolerance of the metal insert 90 is the lower tolerance of the predetermined tolerance, i.e., the aperture tolerance of the metal insert 90 is -0.02mm, the peripheral wall of the sealing part 11 fits against the inner wall of the sealing hole 902 to prevent the adhesive from flowing into the insertion hole 901 from the sealing hole 902; when the aperture tolerance of the metal insert 90 is between the lower and upper tolerances of the predetermined tolerance, i.e., the aperture tolerance of the metal insert 90 is greater than -0.02mm and not greater than 0.02mm, there is a gap between the peripheral wall of the sealing part 11 and the inner wall of the sealing hole 902, and the adhesive cannot flow into the insertion hole 901 from the sealing hole 902 due to capillary resistance and surface tension.
[0048] In one embodiment, the plug 11 is detachably connected to the rod body 12, such as by a threaded connection, so that the plug 11 with the fastening assembly 20 can be replaced without replacing the rod body 12, to meet the requirements of the metal insert 90 for different apertures, thereby reducing production costs.
[0049] Those skilled in the art should understand that the embodiments of this application described above and shown in the accompanying drawings are merely examples and do not limit the scope of this application. The advantages of this application have been fully and effectively implemented. The functional and structural principles of this application have been demonstrated and explained in the embodiments, and any variations or modifications can be made to the implementation of this application without departing from the stated principles.
Claims
1. A plug-in structure for preventing injection molding overflow, capable of inserting a metal insert, the metal insert having a socket and a sealing hole, the socket communicating with the sealing hole, characterized in that, The plug-in structure for preventing injection molding overflow includes: A plug rod is inserted into the socket of the metal insert and extends from the socket to the sealing hole, with a portion of the plug rod placed inside the sealing hole to prevent adhesive from flowing from the sealing hole to the socket; A fastening assembly includes at least one fastener and at least one abutment. The fastener is formed at one end of the insert and extends along the length of the insert. The abutment is formed on a side wall of the at least one fastener away from the axis of the insert. The side of the abutment away from the fastener is subjected to pressure, causing the fastener to elastically deform and bend toward the axis of the insert. When the insert is inserted into the metal insert, the abutment on the surface of the at least one fastener is interference-fitted with the inner wall of the sealing hole.
2. The plug-in structure for preventing injection molding overflow according to claim 1, characterized in that, The fasteners are provided in multiple ways, and at least two of the fasteners have an abutment on their surfaces. All the abutments are kept at the same horizontal height and have the same thickness.
3. The plug-in structure for preventing injection molding overflow according to claim 1, characterized in that, The fasteners are provided in multiple ways, with at least two fasteners having an abutment on their surfaces, and the horizontal planes where the at least two abutments are located have a predetermined height difference, with the thickness of the abutment located at the higher position being greater than the thickness of the abutment located at the lower position.
4. The plug-in structure for preventing injection molding overflow according to claim 3, characterized in that, There is a gap between the end face of the fastener near the insertion rod and the edge of the corresponding end face of the insertion rod.
5. The plug-in structure for preventing injection molding overflow according to claim 3, characterized in that, The fastener's side away from the insertion rod's axis is connected to the insertion rod's peripheral wall and is partially inclined. Taking the direction of the fastener's extension toward the insertion rod as a reference, the cross-sectional dimension of the end of the fastener away from the insertion rod gradually increases.
6. The plug-in structure for preventing injection molding overflow according to claim 5, characterized in that, At least one of the fasteners does not have the abutment.
7. The plug-in structure for preventing injection molding overflow according to claim 6, characterized in that, The insertion rod includes a sealing part and a rod body. The sealing part is disposed at one end of the rod body, and the fastener is formed on the end face of the sealing part away from the rod body. The rod body is inserted into the insertion hole and drives the sealing part to move into the sealing hole. The sealing part is used to prevent the adhesive from flowing into the insertion hole from the sealing hole.
8. The plug-in structure for preventing injection molding overflow according to claim 7, characterized in that, The sealing part is detachably connected to the rod body.
9. The plug-in structure for preventing injection molding overflow according to claim 7 or 8, characterized in that, The aperture tolerance of the metal insert is -0.02~0.02mm. There are three fasteners, two of which have abutment members on their surfaces. The thickness of the abutment member located at the lower position is 0.02~0.025mm, and the thickness of the abutment member located at the higher position is 0.04~0.045mm.
10. The plug-in structure for preventing injection molding overflow according to claim 1, characterized in that, When the abutment is fitted against the inner wall of the sealing hole, the interference fit between the two is 0.005~0.01mm.