Injection mold with rear mold dark drawing structure
By adopting a back mold dark extraction structure in the injection mold, using the socket fitting of the outer molding block and the inner molding block and the oblique guide fit of the molding slide, the problem of difficult to form and trip the inner wall bayonet in the prior art products is solved, and the effective molding and tripping of the bayonet is achieved, with the characteristics of simple structure and simple operation.
Patent Information
- Application Number
- CN202421542411.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-02
AI Technical Summary
The prior art is difficult to effectively mold and trip the bayonets on the inner walls of products, especially in areas with small spaces.
The injection mold adopts a rear mold dark extraction structure, an annular groove is formed through the inner and outer sleeves of the outer molding block and the inner molding block, and a give way notch is opened on the inner molding block. The inverted guide of the molding slide and the oblique guide column are used to achieve the inverted molding part of the molding slide to extend into or withdraw from the annular groove, completing the forming and tripping of the bayonet.
It realizes effective forming and tripping of the bayonet on the inner side wall, and has the characteristics of simple structure and easy operation.
Smart Images
Figure CN222768888U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of injection molds, in particular to an injection mold with a rear mold concealed drawing structure. Background Art
[0002] An injection mold is a tool for producing plastic products; it is also a tool that gives plastic products a complete structure and precise dimensions. Injection molding is a processing method used in mass production of certain parts with complex shapes. Specifically, it refers to the process of injecting heated and molten plastic into the mold cavity under high pressure by an injection molding machine, and obtaining a molded product after cooling and solidification.
[0003] like Figure 1 The figure shows one of the products that need to be obtained by injection molding. The product has an inner shell 1 located in the center and an annular cylinder wall 3 located on the periphery of the inner shell 1. The inner shell 1 has a concave cavity 2 with a relatively deep depth and a relatively small diameter. The inner side wall of the annular cylinder wall 3 is formed with a bayonet 4 for matching with a buckle; the bayonet 4 is arranged on the inner side wall, and the space is narrow. The existing technology cannot well meet the injection molding requirements of the product; therefore, it is necessary to redesign an injection mold for the bayonet of the product. Utility Model Content
[0004] Therefore, the utility model provides an injection mold with a rear mold concealed draw structure to solve the above problems.
[0005] To achieve the above purpose, the technical solution provided by the utility model is as follows:
[0006] An injection mold with a rear mold concealed draw structure comprises a front mold, a rear mold, a front mold core and a rear mold core; the rear mold core comprises an outer molding block, an inner molding block and at least one group of concealed draw slider groups, the outer molding block is fixed on the rear mold and has a sleeve hole, the inner molding block is sleeved in the sleeve hole of the outer molding block and forms an annular groove, and the inner molding block is provided with a clearance notch that passes through the annular groove; the concealed draw slider group comprises a molding slider and an inclined guide column, the molding slider is penetrated on the outer molding block, the first end of the molding slider is located at the clearance notch of the inner molding sleeve and has an undercut molding part; an inclined guide column is fixed on the front mold, and the inclined guide column forms an inclined guide fit with the molding slider; the relative movement of the front mold and the rear mold drives the undercut molding part of the molding slider to extend into or withdraw from the annular groove.
[0007] Furthermore, the second end of the forming slider is located outside the outer forming block, and the oblique guide column and the second end of the forming slider form an oblique guide fit.
[0008] Furthermore, a plurality of clearance gaps are provided on the inner forming block, and each clearance gap is equipped with a group of the concealed drawer slider groups.
[0009] Furthermore, a laterally protruding limiting step is provided on the outer periphery of the inner forming block, and the outer forming block is fixed to the rear mold plate of the rear mold and abuts against the limiting step of the inner forming block.
[0010] Furthermore, the concealed drawer slider group also includes an ejector column; the inner molding block has a through hole, the front end of the ejector column is inserted into the through hole of the inner molding block, and the rear end of the ejector column is connected to the ejector plate of the rear mold.
[0011] Furthermore, a cooling water pipe is provided in the ejector column, the cooling water pipe extends out through the rear end of the ejector column, a water inlet is provided on the ejector plate of the rear mold assembly, and the cooling water pipe is connected to the water inlet.
[0012] Furthermore, the inner molding block has a central groove, and the front mold core includes a front mold insert, which is inserted into the central groove of the inner molding block and forms a cup-shaped cavity with a "U"-shaped cross-section, and the cup-shaped cavity is a part of the molding cavity.
[0013] Furthermore, a mounting hole extending from front to back is provided at the center of the front mold insert, a tube core is installed in the mounting hole, the tube core and the front mold insert form an annular dam cavity, a first row of channels is provided on the outer peripheral wall of the tube core; a core column is inserted in the center hole of the tube core; a second exhaust channel is provided on the core column.
[0014] Furthermore, the front mold insert is a component obtained by 3D printing and has a spiral cooling channel inside.
[0015] The technical solution provided by the utility model has the following beneficial effects:
[0016] An annular groove is obtained by the inner and outer joints of an outer forming block and an inner forming block; and a clearance notch is provided on the inner forming block, which passes through the annular groove; a forming slider is passed through the outer forming block, and forms an oblique guide with an oblique guide column on the front mold, and the undercut forming part of the forming slider is driven to extend into or out of the annular groove through the relative movement of the front mold and the rear mold (i.e., the closing and opening action of the mold), so that the forming and release of the bayonet on the inner wall can be well realized, and the structure is simple and easy to realize. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 Shown is a cross-sectional view of a product produced by injection molding;
[0018] Figure 2 The figure shows a cross-sectional view of an injection mold with a rear mold dark draw structure in an embodiment;
[0019] Figure 3 Shown Figure 2 A magnified schematic diagram of the middle A area;
[0020] Figure 4 The figure shows a schematic diagram of the undercut forming portion of the forming slider in the embodiment extending into the annular groove;
[0021] Figure 5 The figure shows a schematic diagram of the undercut forming portion of the forming slider in the embodiment when it is pulled out of the annular groove;
[0022] Figure 6 It is a schematic diagram of the rear mold and rear mold core of the injection mold with the rear mold hidden draw structure in the embodiment;
[0023] Figure 7 Shown Figure 6 a cross-sectional view of the structure shown;
[0024] Figure 8 The figure is a schematic diagram of the structure decomposition of the concealed drawer slider group in the embodiment;
[0025] Fig. 9 Shown is a partial structural decomposition schematic diagram of the front mold core in the embodiment. DETAILED DESCRIPTION
[0026] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.
[0027] In the description of the present invention, terms such as "up", "down", "left", "right", "front", "back", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.
[0028] The utility model is now further described in conjunction with the accompanying drawings and specific implementation methods.
[0029] Reference Figures 2 to 9 As shown, the present embodiment provides an injection mold with a rear mold concealed draw structure, comprising a front mold 10, a rear mold 20, a front mold core 30 and a rear mold core 40; the matching relationship between the front mold 10, the rear mold 20, the front mold core 30 and the rear mold core 40 is known, such as when the front mold 10 and the rear mold 20 are molded together, the front mold core 30 and the rear mold core 40 are matched and enclosed to form a molding cavity 101, such as Figures 2 to 4Specifically, the structures of the front mold 10 and the rear mold 20 adopt the existing technology, such as the front mold 10 includes a plurality of front mold plates and a glue inlet channel set on the plurality of front mold plates; the rear mold 20 includes a rear mold plate 21, an ejector pin and an ejector plate 22 connected to the ejector pin. At the same time, in this embodiment, the number of matching groups of the front mold core 30 and the rear mold core 40 is two. Of course, in other embodiments, the number of matching groups of the front mold core 30 and the rear mold core 40 can also be one or more than two. The following is an expanded description of one group.
[0030] Specifically, the rear mold core 40 includes an outer molding block 41, an inner molding block 42 and at least one group of hidden slide blocks, specifically, four groups of hidden slide blocks. The outer molding block 41 is fixed to the rear mold 20 and has a sleeve hole 411; the inner molding block 42 is sleeved in the sleeve hole 411 of the outer molding block 41 to form an annular groove 102. Specifically, the annular groove 102 is a part of the molding cavity 101, which is used to mold the Figure 1 The annular cylinder wall 3 of the product shown; specifically, the lower parts of the inner forming block 42 and the outer forming block 41 are tightly fitted, and the upper parts of the inner forming block 42 and the outer forming block 41 are arranged at intervals to form the annular groove 102. The inner forming block 42 is provided with a clearance notch 421 that penetrates into the annular groove 102; specifically, there are four clearance notches 421, which are evenly distributed in the circumferential direction; each clearance notch 421 is equipped with a group of the concealed drawer slider group. The axial direction of the inner forming block 42 is defined as the front-to-back direction, and in the radial direction perpendicular to the axial direction of the inner forming block 42, the direction toward the central axis of the inner forming block 42 is the inner side, and the direction away from the central axis of the inner forming block 42 is the outer side; the clearance notch 421 is equivalent to being set on the inner groove wall of the annular groove 102.
[0031] The concealed drawer slider group includes a forming slider 43 and an inclined guide column 46. The forming slider 43 is inserted into the outer forming block 41. The first end of the forming slider 43 is located at the yielding notch 421 of the inner forming sleeve 42 and has an undercut forming portion 431. The inclined guide column 46 is fixed to the front mold 10, and the inclined guide column 46 forms an inclined guide fit with the forming slider 43. The relative movement of the front mold 10 and the rear mold 20 drives the undercut forming portion 431 of the forming slider 43 to extend into or withdraw from the annular groove 102.
[0032] That is, when the front mold 10 and the rear mold 20 are in a mold closing action (i.e., approaching each other until they are closed), the molding slide 43 is driven to move outward by the inclined guide pillar 43, so that the undercut molding portion 431 of the molding slide 43 extends into the annular groove 102, as shown in FIG. Figure 4As shown. After injection molding, the position of the undercut molding part 431 forms the structure of the bayonet 4; after injection molding is completed, the front mold 10 and the rear mold 20 open the mold (i.e., move away from each other), and the molding slide 43 is driven inward by the inclined guide column 46, so that the undercut molding part 431 of the molding slide 43 is pulled out of the annular groove 102, realizing lateral core pulling, which is convenient for the subsequent product removal; this method of inward retraction and pulling out forms a hidden pulling structure. It can well realize the following Figure 1 The product shown has a snap-on 4 formed on the inner wall of the annular cylinder wall 3; and has a simple structure and is easy to operate, and only requires the normal mold opening and closing actions of the front mold 10 and the rear mold 20 to be used.
[0033] Furthermore, the second end of the molding slide block 43 is located outside the outer molding block 41, and the oblique guide column 46 forms an oblique guide match with the second end of the molding slide block 43, and the exposed second end portion is convenient for matching with the oblique guide column 46. Specifically, the oblique guide column 46 forms an oblique guide match with the second end of the molding slide block 43 in the following manner: an oblique guide hole oblique to the front-to-back direction of mold opening / closing is provided at the second end of the molding slide block 43, and the end of the oblique guide column 46 is also obliquely arranged and matched in the oblique guide hole of the molding slide block 43; in this way, the front-to-back movement of the front mold 10 and the rear mold 20 drives the lateral movement of the molding slide block 43 through the oblique guide matching structure.
[0034] The outer periphery of the inner forming block 42 is provided with a laterally protruding limiting step, and the outer forming block 41 is fixed to the rear mold plate 21 of the rear mold 20 and abuts against the limiting step of the inner forming block 42; in this way, it is sufficient to fix the position of the outer forming block 41, which simplifies the operation.
[0035] The concealed drawer slider group also includes an ejector column 45; the inner molding block 42 has a through hole 422, the front end of the ejector column 45 is inserted into the through hole 422 of the inner molding block 42, and the rear end of the ejector column 45 is connected to the ejector plate 22 of the rear mold 20; the ejector column 45 is set to form a central groove with the inner molding block 42 on the one hand, and the bottom of the central groove is the front end surface of the ejector column 45, and on the other hand, it is used to eject the product.
[0036] Specifically, the front mold core 30 includes a front mold core plate 31 and a front mold insert 32. The front mold insert 32 is assembled on the front mold core plate 31, and the front mold core plate 31 is fixed on the front mold 10. When the mold is closed, the front mold core plate 31 abuts against the outer molding block 41. The front mold insert 32 is inserted into the central groove of the inner molding block 42 and forms a cup-shaped cavity 103 with a "U"-shaped cross-section. The cup-shaped cavity 103 is a part of the molding cavity 101 and is used to mold such as Figure 1 Inner shell 1 of the product shown.
[0037] Since the center groove is a structure with a small diameter and a deep depth, the front mold insert 32 needs to be designed as a slender structure. The structure prepared by conventional means cannot be well designed with a cooling channel. Therefore, in this embodiment, the front mold insert 32 is a component obtained by 3D printing and has a spiral cooling channel inside. The structure of the front mold insert 32 is obtained by 3D printing, which is simple to prepare and has a good cooling function.
[0038] Furthermore, due to Figure 1 The inner cavity 2 of the inner shell 1 of the product shown has a circle of raised dam 5 at the bottom, so the space for forming the dam 5 needs to be designed on the front mold insert 32; for this reason, in this embodiment, the center of the front mold insert 32 is provided with a mounting hole 321 that passes through from front to back, and a core 33 is installed in the mounting hole 321. The core 33 and the front mold insert 32 form an annular dam cavity 104, and the dam cavity 104 is also a part of the molding cavity 101. The dam cavity 104 is used to mold the dam 5 mentioned above; the outer peripheral wall of the core 33 is provided with a first row of channels 331; used to discharge the air in the dam cavity 104 during injection molding. At the same time, during injection molding, in order to achieve exhaust in the central area inside the dam cavity 104, in this embodiment, a core column 34 is inserted in the center hole of the core 33; a second exhaust channel 341 is provided on the core column 34; in this way, the complete injection molding of the product is ensured. Of course, in other embodiments, the above structure is not limited to this.
[0039] Although the present invention has been specifically demonstrated and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes may be made to the present invention in form and detail without departing from the spirit and scope of the present invention as defined in the appended claims, all of which are within the scope of protection of the present invention.
Claims
1. An injection mold with a rear mold hidden draw structure, comprising a front mold, a rear mold, a front mold core and a rear mold core; characterized in that: The rear mold core includes an outer molding block, an inner molding block and at least one group of concealed sliding blocks, the outer molding block is fixed on the rear mold and has a sleeve hole, the inner molding block is sleeved in the sleeve hole of the outer molding block to form an annular groove, and the inner molding block is provided with a clearance notch that passes through the annular groove; the concealed sliding block group includes a molding slider and an inclined guide column, the molding slider is penetrated by the outer molding block, the first end of the molding slider is located at the clearance notch of the inner molding sleeve and has an undercut molding part; the inclined guide column is fixed on the front mold, and the inclined guide column and the molding slider form an inclined guide fit; the relative movement of the front mold and the rear mold drives the undercut molding part of the molding slider to extend into or withdraw from the annular groove.
2. The injection mold with a rear mold hidden draw structure according to claim 1, characterized in that: The second end of the forming slide block is located outside the outer forming block, and the oblique guide column and the second end of the forming slide block form an oblique guide fit.
3. The injection mold with a rear mold hidden draw structure according to claim 1 or 2, characterized in that: A plurality of clearance notches are provided on the inner forming block, and each clearance notch is equipped with a group of the concealed drawer slider groups.
4. The injection mold with a rear mold hidden draw structure according to claim 1, characterized in that: The outer periphery of the inner forming block is provided with a laterally protruding limiting step, and the outer forming block is fixed to the rear mold plate of the rear mold and abuts against the limiting step of the inner forming block.
5. The injection mold with a rear mold hidden draw structure according to claim 1, characterized in that: The concealed drawer slider group also includes an ejector column; the inner molding block has a through hole, the front end of the ejector column is inserted into the through hole of the inner molding block, and the rear end of the ejector column is connected to the ejector plate of the rear mold.
6. The injection mold with rear mold hidden draw structure according to claim 5, characterized in that: A cooling water pipe is arranged in the ejector column, and the cooling water pipe extends out through the rear end of the ejector column. A water inlet is arranged on the ejector plate of the rear mold assembly, and the cooling water pipe is connected to the water inlet.
7. The injection mold with a rear mold hidden draw structure according to claim 1, characterized in that: When the front mold and the rear mold are closed, the front mold core and the rear mold core cooperate and enclose to form a molding cavity, the inner molding block has a central groove, the front mold core includes a front mold insert, the front mold insert is inserted into the central groove of the inner molding block, and forms a cup-shaped cavity with a "U"-shaped cross-section, and the cup-shaped cavity is a part of the molding cavity.
8. The injection mold with a rear mold hidden draw structure according to claim 7, characterized in that: A mounting hole that passes through from front to back is arranged at the center of the front mold insert, a barrel core is installed in the mounting hole, the barrel core and the front mold insert form an annular dam cavity, a first row of channels is opened on the outer peripheral wall of the barrel core; a core column is inserted in the center hole of the barrel core; a second exhaust channel is opened on the core column.
9. The injection mold with a rear mold concealed draw structure according to claim 7, characterized in that: The front mold insert is a component obtained by 3D printing and has a spiral cooling channel inside.